SCHUNK GFT-X 270 Operating Manual

Operating Manual

Hardware/Software Version 1.8/1.5

Date: December 2012

H.-D. SCHUNK GMBH & CO. SPANNTECHNIK KG

Lothringer Straße 23, D-88512 Mengen

Tel. [phone], Fax [phone]

Manufactured exclusively by

MESA Systemtechnik GmbH  D-78467 Konstanz

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 2

H.-D. SCHUNK GMBH & CO. SPANNTECHNIK KG Lothringer Straße 23 D-88512 Mengen

Tel. [phone] Fax [phone] www.schunk.de

Congratulations on your new Gripping Force Tester GFT®-X 270! You have made an excellent
choice in buying this innovative technology which offers a variety of advantages in its use. In
order to avoid handling errors you should take a few minutes and read these operating manual
carefully.

When you have read these manual you should keep them safely at a place where they can be
easily accessed so you can refer to them again at any time. Keep your Gripping Force Tester

GFT

®

-X 270 in the transport case where it has optimum protection. When the device is
dispatched for maintenance or repair, it must also be sent in the transport case so that the
sensitive parts are protected in an optimum way during transportation.

The information and data contained in these operating manual may be modified without prior
notice. No part of this documentation may be reproduced or transmitted for any purpose
whatsoever, regardless of the mode or the means, electronically or mechanically, without the
prior permission in writing of MESA Systemtechnik GmbH.

In order to protect the unit against fire, electric shock or potential destruction of the electronic
components, it must never be exposed to rain or extreme humidity. Direct sun or heat are to be
avoided as well.

Please do not try to open the hand-held unit or the measuring device. There are no parts inside
which you could maintain.

All data in this publication have been compiled and checked with utmost diligence, nevertheless
errors and mistakes cannot be totally excluded.

All modifications, in particular those relating to technological improvements, are reserved.

© 2012  MESA Systemtechnik GmbH  Konstanz  All rights reserved.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 3

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Tel. [phone] Fax [phone] www.schunk.de

Table of Contents

1 Introduction 5
2 Safety information 5

2.1 Introduction 5

2.2 Safety information pictograms 5

3 System requirements 5
4 Introduction 6

4.1 Packing list 6

5 Overview 7
6 Technical Data 8

6.1 GFT

®

-X Handheld Unit 8

6.2 Measuring Heads for collets 8

6.3 Measuring Heads for jaw chucks 9

6.4 Mains / Battery operation 9

7 Handheld GFT

®

-X 10

7.1 Overview 10

7.2 Keyboard GFT

®

-X Handheld Unit 10

7.3 Status Line 11

7.4 LED indicator 12

7.5 Speed Buttons 12

7.6 Menu GFT®-X Hand Held - outline 13

7.6.1 Menu-Overview 14

7.6.2 Measuring 15

7.6.2.1 Measuring Head Recalibration 15

7.6.2.2 Recharge Measuring Head 16

7.6.3 Define new data collection 16

7.6.4 Settings 17

7.6.5 Menu Measuring Head 18

7.6.6 Menu collet chuck 19

7.6.7 Select Language 19

8 Measuring Head 20

8.1 Measuring Head M1 and M2 for collets 20

8.2 Measuring Head M3 and M4 for jaw chuck 21

8.2.1 Measuring Head Extension Cylinder for M3 und M4 23

8.2.2 Mounting M3 und M4 Measuring Head 23

8.3 Measuring procedere 24

8.3.1 Static Measuring 24

8.3.2 Dynamic Measuring 24

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9 Calibration, Recalibration 25
10 Maintenance, Service 25
11 Measured data display / storage on PC 26

11.1 Installing ChuckExplorer 26

11.2 Using the software 28

11.2.1 Measurement 30

11.2.2 Measurement preparations 30

11.2.3 Manual measuring 31

11.2.4 Automatic measuring 31

11.3 Download data from GFT

®

-X Handheld Unit 32

11.4 Loading and saving files 32

12 Software update 33

12.1 Problems with the Update of the GFT-X Handheld Unit cause / corrective 35

13 Trouble shooting / FAQ´s 36

13.1 Problems at GFT

®

-X Handheld Unit cause / corrective 36

13.2 Problems with Chuck Explorer – cause / corrective 36

14 How to change the power plug at mains adapter 38
15 Changing the battery of the Handheld Unit 39
16 Accessories / spare parts list 40

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 5

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Tel. [phone] Fax [phone] www.schunk.de

1 Introduction

This manual contains important information about connection and safety operation of the

Gripping Force Testers GFT

®

-X270. Please read the safety instruction carefully.

2 Safety information

2.1 Introduction

The Gripping Force Tester GFT®-X 270 is constructed according to DIN EN 61010-1; VDE
0411-1:2009-06. At the upper front face the Handheld Unit contains an USB slave connector for
data communication with a Windows

®

based computer and for power supply / recharging. The
Power Supply Plug operates in the range of 100V~-240V~ alternating current and complies with
EN60950-1 and UL60950-1.

2.2 Safety information pictograms

Helpfull Information / Hints

Pictogram advices helpfull informations and hints.

Danger!

Please read observantly, non-compliance may result in risk of severe damage to
your health.

Warning!

Non-compliance may result in risk of damage at the GFT-X.

3 System requirements

Operating Systems

• Windows 2000

• Windows XP

• Windows Server 2003

• Windows Vista

• Windows 7

Recommended Hardware

• 233 MHz processor (Recommended: pentium 500 MHz or newer processor)

• 64 MB RAM (Recommended: 128 MB RAM or more)

• 20 MB of hard drive space

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 6

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4 Introduction

The Gripping Force Tester GFT®-X 270 allows the measurement of tension when the chuck or
collet is in either static or dynamic mode.
Using a complex array of strain gauges in the Measuring Head, the mechanical forces are
converted into an electrical signal and amplified by the integrated electronics. The amplified
signals are transmitted from the Measuring Head with an integrated UHF transmitter (433MHz)
to the Handheld Unit to be displayed and processed.
On the display the current clamping force and, in dynamic mode, the accompanying number of
revolutions of the chuck are indicated.

The Handheld Unit is equipped with a high resolution TFT display which shows all important
menu items as icons. These icons, which are self-evidend, and a transparent command
structure allows easy operation also for occasional users.
All items are designated for use in severe workshops, the Handheld Unit is in addition equipped
with a silicon protector and offers therefore utmost protection against shocks and drop down.

4.1 Packing list

When you open the case, please make sure that all parts and components are included in the

Gripping Force Testers GFT

®

-X 270 M3 / M4 package:

; Handheld Unit GFT

®

-X 270 with Protector

; Power Supply Plug with USB master-connector
; Adapter for North America, United Kingdom, Australia and Europe
; GFT

®

-X ChuckExplorer for Windows-XP / Windows 7

(CD contains operating software and operating manual)

; USB- connecting cable from Handheld Unit to PC/Laptop, approximately 1m length
; Measuring Head for jaw chucks with rotating electronics and 4 each of Extension

Cylinder for jaw diameter ø72mm

; 3 each Extension Cylinders for jaw diameter ≥88 und ≥108mm
; Torx-key T15 inclusive spare screws
; Stand with magnetic mounting for rpm measurement
; Measuring Head - charging cable, 2 pin, approximately 1m length
; Loading Bracket for Measuring Head

The GFT

®

-X Upgrade Kit includes following parts:

; Handheld Unit GFT®-X with Protector
; Power Supply Plug with USB master-connector
; Adapter for North America, United Kingdom, Australia and Europe
; GFT

®

-X ChuckExplorer for Windows-XP / Windows 7
(CD contains operating software and operating manual)
; USB-connection cable from Handheld Unit to PC/Laptop, approximately 1m length

GFT

®

-X Upgrade Kit can only be used for Measuring Heads showing a serial

number of >= 0089-3.

For other Measuring Heads packing list can vary.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 7

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5 Overview

Figure: GFT

®

-X measuring set up

A fundamental distinction is made between stationary and dynamic mode:

Static operation

Measuring Head to be clamped, magnetic mounting for rpm measurement is not
needed

Dynamic operation

Measuring Head to be clamped, the stand for rpm measuring is fastened to the
support of the machine. Now the support must be positioned in such a way that the
magnetic bar ends besides the black cover of the Measuring Head (see chapter

8.3.2)

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 8

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6 Technical Data

6.1 GFT®-X Handheld Unit

Power supply via USB, 5V DC

Measurement range / gripping force F

indication in kN or lbf, selectable by user
bargraph in % full scale, wheras value of
measurement range is indicated as follows:

0.....80% green,

80.…95% yellow,

95...100% red.

Measurement range / speed (rpm) indication in 1/min (can be switched off)
Dimensions 220x100x50mm
Weight 460g
Operating temperature 0...40°C
Protection class IP54
Interface PC / Laptop USB 2.0
Data cable/charging cable Handheld Unit approx. 1,5m length
Charging cable for Measuring Heads approx. 1m length including mating connector
Receiving frequency 433,92 MHz
Distance Handheld Unit / Measuring Head see chapter 6.2 / 6.3

6.2 Measuring Heads for collets

Measuring Head M1 Measuring Head M2

Power supply internal energy storage
Energy storage capacity ca. 1,5h@50% duty cycle

Measurement range/gripping
force F

0...75kN 0...120kN

Measurement range/
speed of rotation (rpm)

>approx. 200*) to <10.000 rpm >approx. 200*) to <8.000 rpm

Accuracy (F/rpm) <5% / <1% fsr
Clamping diameter 18mm 42mm
Number of jaws 3 3
Dimensions ø18/57x56mm ø42/57x63mm
Weight 400g 700g
Operating temperature 0...40°C
Protection class IP65
Transmitting frequency 433,92MHz
Charge time <3 minutes

Distance Handheld Unit/
Measuring Head

>1m and <4m straight line (value may vary depending on the
ambient conditions)

*) the lower value can start from 60 rpm by reducing the gap between magnet and Measuring
Head from 3mm to about 2mm

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6.3 Measuring Heads for jaw chucks

Measuring Head M3 Measuring Head M4

Power supply by internal energy storage
Energy storage capacity approx. 1,5h@50% d.c. approx. 1,5h@50% d.c.

Measurement range/gripping
force F

0…180kN (2 jaws)
0…270kN (3 jaws)

0…30kN (2 jaws)
0…45kN (3 jaws)

Measurement range/speed (rpm) >ca. 200*) bis <6.000 rpm
Accuracy (F/rpm) <3% / <1% fsr <1,5% / <1% fsr
Clamping diameter 72…108mm
Number of jaws 2 or 3, user adjustable
Dimensions ø68/57x63mm
Weight 700g without extentions
Operating temperature 0…40°C
Protection class IP65
Transmitting frequency 433,92MHz
Charge time <3 minutes

Distance Handheld Unit/
Measuring Head

>1m and <4m straight line (value may vary depending on the
ambient conditions)

*) the lower value can start from 60 rpm by reducing the gap between magnet and Measuring
Head from 3mm to about 2mm

6.4 Mains / Battery operation

The GFT®-X Handheld Unit is supplied by 5VDC (500mA) via a Power Supply Plug with an input
voltage range from 100VAC to 240VAC. Different interchangeable blade assemblies for North
America, United Kingdom, Australia and Europe are included.
Please see chapter 13 for a guidance to exchange the interchangeable blade assemblies.

Furthermore GFT-X is equipped with a powerful battery (Li-Ion). A one time charge allows an
operation up to 5 hours. During this time frame, a Measuring Head can be loaded up to 4 times
out of the Handheld Unit battery.

A correct indication of the charge condition is only possible until the battery is
completely full charged and discharged first. It's recommended to charge the
handheld unit first completely and then use it until the power is turned off
automatically.

Charging condition of the battery is indicated on battery symbol in Status Line, left side (see
chapter 7.3).

Battery could, if not in use and not charged for several months, discharge itself.
If operating time drops down to less than 2 hours it is recommended to replace the
battery (see chapter 15)

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 10

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7 Handheld GFT

®

-X

7.1 Overview

Measuring Head USB interface/
Power Jack Power Plug

Status Line

Set Menu
Command Line

Display Line for Speed Buttons / Softkeys

Speed Buttons
LED indicator

Key Pad

Powerswitch

7.2 Keyboard GFT®-X Handheld Unit

To switch on and off the Handheld Unit press for about 2 seconds. First it appears the
Welcome Logo, at the same time blue LED twinkles. The Set Menu appears after 2 seconds
automatically.

Speed Button – With this button the above indicated menu

item will be chosen. These buttons are freely configurable
(see chapter 7.4)

Moves icon or line above Moves icon or line down

Moves icon or character / number to the right
Moves icon or character / number to the left
Delete deletes last input (character / number)
Menu Back to Main Menu
ESC Back one level above
OK Confirm selection

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7.3 Status Line

Explanation of the symbols from left to right:

>80% >50% >10% <10% <10%, <10min (charging condition/remaining time)

Indicates the current charging condition of the integrated Lithium-Ion battery. At a remaining
operating time of less than 10 minutes a pop-up window appears and remembers you to
connect the Handheld Unit to a Power Supply or a PC.
If the charging symbol turns red it is not possible charging the Measuring Head or the charging
process stops.

If an unloaded Measuring Head shows >0kN (offset), tare is possible by pressing in the
menu Measurement.
Deviations >3% (M1 – M3) and >5% (M4) of measurement range couldn´t be compensated.
The Measuring Head should be returned for service.
Meaning of symbol colors:
Green symbol - Measuring Head works fine, no tare applied
Yellow symbol - Measuring Head still works fine, however tare has been applied
Red symbol - Measuring Head for service, offset to large, tare is impossible

Green symbol if PC or Power Supply is attached and connection is fine. Red symbol means no
USB connection.

Blinking green symbol indicates proper radio communication to Measuring Head.
Red symbol indicates disturbed radio communication or no Measuring Head available /in range.

Indicates chosen Measuring Head M1 or M2. At M3 and M4 the number of jaws is also
indicated.

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Charging condition of Measuring Head, quantitative indication only (shown if measuring head is
switched on).

Tara function always to refers to the dedicated Handheld Unit. If Measuring Head is
tared with different Handheld Units the Measuring Head could be damaged.

The charging condition detection of Handheld Unit is self-learning. It takes several
charging cycles till the charge status is detected properly. First charge is already
made at factory.

7.4 LED indicator

Left and right below the Speed Buttons two LED are located with following meaning:

- While pressing twinkles some times prior to
Welcome Logo appears

- twinkles as soon display turns into Power Save Mode
(display almost dark)

Charge indicator: LED is illuminated during charging is in
progress

7.5 Speed Buttons

The lowermost line of the display is reserved for Softkeys
which can be programmed by the user. The left three Icons
are free to be programmed, whereas the Icon on the right
side is predetermined to charge the Measuring Head.

Setting / programming Speed Buttons

-choose the relevant function

-activate the Icon (triangle on the left and a highlighted
frame)

-press desired Speed Button for about 2 seconds

-the Icon appears in the display
As soon as desired symbol appears in the Speed Button

Bar, the programming is finished successfuly.
The Softkeys could be programmed as often as desired.

Already programmed keys couldn´t be deleted. Only overwriting is possible.
In some Menus not each Softkey is available.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 13

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7.6 Menu GFT®-X Hand Held - outline

Use the arrow keys for easy navigation on Set menu. By pressing you will end up directly to
the important sub menu.
The chosen or activated Icon will be discovered by a triangle on the left side and a highlighted
frame. A clear explanation is also shown in the Command Line.

The main menu encloses represented icons:

Icon*) Description Further notes

Measurement see chapter 7.6.2

Define new data collection see chapter 7.6.3

Settings see chapter 7.6.4

Menu Measuring Head see chapter 7.6.5

Menu collet chuck see chapter 7.6.6

Select language see chapter 7.6.7

*) All Icons figured as „selected“, identifiable by the white triangle, at the left side of the border.

All functions and Icons are explained in a tree structure on next page, followed by a
detailed description of the relevant commands.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 14

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7.6.1 Menu-Overview

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7.6.2 Measuring

Individual measurement for an experimental setup could easily be performed and
displayed with this function. The Measuring Head to be chosen should be desired
and activated under Icon Menu Measuring Head.

If a pop up Windows appears with „No Measuring Head connected!“ make sure that
Measuring Head is switched on (white LED on Measuring Heads front face is
twinkling). Radio communication should also be checked.

7.6.2.1 Measuring Head Recalibration

If the Measuring Head is connected to GFT

®

-X Handheld

Unit, following message will be shown:

Serial number: x x x x – x
Calibration expires:

When using a new Measuring Head it will give an advice
(see date code) to a label sticked on the Measuring Head.
The sticker shows the date when factory calibration date
expires.
After the first factory recalibration the date of expire will be
shown in a format MM_YYYY like shown in the sample left.
Recalibration should be performed at least every 12
months to guarantee correct function of Measurement
Head.

Version: y_y displays software version of Measuring Head

To be confirmed by pressing OK

The Handheld Unit now shows the current measurement
values. If no load is applied to the Measurement Head and
the indication shows a value >0kN, tare function can be
applied by pressing (see chapter 7.3).

Depending on individual Setting (see chapter 7.6.4) the
force only will be indicated or both force and speed. The
unit for force can be adjusted to kN or lbf (1kN = 0,2248 x
1000lbf).

If needed the Measuring Head can be recharged directly
form this menu by using the relevant Speed Button.

If no Measuring Head is chosen the message No

Measuring Head connected! appears. This window must

be confirmed by pressing OK. Managing all Measurement
Heads must be performed under Menu Measuring Head,
chapter 7.6.5.

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7.6.2.2 Recharge Measuring Head

This Icon is available independent where you currently are. It allows easy and fast loading of a

linked Measurement Head at any time. Just link the Handheld Unit to the
Measurement Head (switched off) with the Connecting Cable and press the relevant
Speed Button. The message “Measuring head battery charging…” appears. Is the
loading process finished after a few minutes the message “Battery is fully charged”

appears. Both popup windows should be confirmed by

7.6.3 Define new data collection

This function allows the aquisition of up to 20 measurement values and store them
under a user defined name. This data can be processed afterwards by the

ChuckExplorer. This tool allows easy transfer of the data to a PC, showing it on xy

diagram and archive it. The number of stored data to be transferred to a PC is not
limited.

First put in your individual entry. Navigate by using arrow
keys , confirm by corrections to be made by
or back.

iD: up to 10 characters/numbers
Date: use format DayDay_MonthMonth_YearYear

(just use 2 last digits for year, e.g. 11 for 2011
Number: maximum 3 digits, numbers only, range from

1 to 254

Activate save or press the Speed Button floppy disk to memorize your entries. Now
you jump directly to measurement mode. Besides the measurement values the
number of stored measurements are indicated.

Use the arrow keys to navigate to the next entry.
Pressing Disc symbol in the Speed Button all entries are stored and a jump to
measurement mode follows. If window keep staying the same the cursor shows you
an invalid or not complete entry. Please check this line and try again.

If cursor keeps staying on the input mask after save or disk symbol is activated, the
Handheld Unit has recognized an entry error. Please check your entries regarding
this chapter again and use just valid characters.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 17

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Speed Buttons layout for further actions:

Accept / overtake measured
value

Finish series of measurements
and exit to Set Menu

Delete measured value

Charge Measuring Head (see
chapter 7.6.2.2)

Handheld Unit always stores the last Measurement Head in use. If you switch on the
Handheld Unit after a while you do not have to activate the Measuring Head again.
The serial number will be stored inside the device till a new entry follows.

7.6.4 Settings

Following functions are available in this menu:

Contrast

Allows quantitative changing of brightness by pressing
arrow keys left or right, confirmation by OK

Display

Indication of measurement values:
force and number of revolutions or force only

Units Force unit to be changed from kN to lbf and v.v.

Screen
saver

Screen saver to be activated after x minutes when no
entries happens.
Time to be set from 1 bis 43 minutes, acceptance of
indicated value by pressing OK.
Reduces brightness to a minimum and helps to increase
operating time. When in Save mode the first entry leads to
normal indication again.

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7.6.5 Menu Measuring Head

The Gripping Force Tester GFT

®

-X can operate with different Measuring Heads.
Available are Measuring Heads for jaw chucks and collets. Furthermore, there is a
choice of different clamping forces, dimensions and number of jaws available.

Basically only one Measuring Head can communicate with
Handheld Unit at the same time. However this menu allows
administration of up to eight Measuring Heads. The
activated Measuring Head is marked with a triangle on the
left side of label.
The image on the left shows a Measuring Head with serial
no 0001-1 which is active.

To navigate use the arrow keys, confirm with

The following commands are available:

Choose
Measuring Head

Activates the relevant Measuring Head with the
triangle from the index

Add a (new)
Measuring Head

A sub menu will open and requires the entry of a new
Measuring Head serial number.

Delete
Measuring Head

Deletes the Measuring Head marked

Recharge
Measuring Head

see chapter 7.6.2.2

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7.6.6 Menu collet chuck

This menu refers to chuck jaw Measuring Head only, which serial number ends with
xxxx-3 or xxxx-4. The Measurement Head M3 and M4 offer the choice of 2 or 3
jaws.

The selection of the number of jaws is made with arrow
keys of the keypad. The active choice is indicated with a
white arrow.

For confirmation press .

7.6.7 Select Language

The GFT

®

-X Handheld Unit is prepared for several languages:

German English

Italian Spanish

Russian Chinese

and

Japanese.

The selection is made with the arrow keys and confirmed by .

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 20

8 Measuring Head

There are four different Measuring Heads available for the GFT®-X. Two for collets (M1 and M2)
and two for chucks (M3 and M4)

The Measuring Head works according to the following principle:
Via a dedicated arrangement of strain gauges inside the Measuring Head, the mechanical forces
are converted into an electrical signal which is amplified by the integrated electronics,
transformed into a digital radio signal via a micro-controller and sent to the Handheld Unit. There
the data signal is encoded and displayed.

Factory provided the Measuring Heads are calibrated. After respectively 12 months
a check-up and a recalibration should take place by the manufacturer. The date for
the next calibration is shown under Menu Measurement or marked on the
Measuring Head (see chapter 7.6.2.1).

The maximum load is mentioned on each Measuring Head. Please make sure that
this value will not exceed because this can lead to non valid measurements or even
to the destruction of the Measuring Head.

Please be assured, that prior to measuring procedure the Measuring Head is tight
and plane-parallel clamped to the rotational axis.

8.1 Measuring Head M1 and M2 for collets

Via the 3 contact surfaces (support) on the Measuring Head the force is transmitted to the
measuring elements inside the housing. It is recommended to use special collets with smooth
finish in order to avoid damage to these contact surfaces. Furthermore, care must be taken to
insert the measuring head in such a way that it does not get tilted. The "jaw centre" inscription
must correspond to the centre of one of the three collet jaws. Please note, that compliance with
the above instructions will be decisive for the quality of the measuring values.

Measuring head M1 (max. 75kN)

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support

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 21

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support
Measuring Head M2 (max. 120kN)

8.2 Measuring Head M3 and M4 for jaw chuck

The Measuring Head M3 and M4 are provided for the measurement of tension or force in jaw
chucks. The Measuring Head M3 is designed for forces up to 90kN per jaw, the Measuring
Head M4 offers higher resolution up to a maximum clamping force of 15kN per jaw. Different
Extension Cylinders making the Measurement Head M3 and M4 applicable for nearly all kinds
of jaws. Extension Cylinders for minimum jaw diameter of 72, 88 and 108 mm are available by
default.

Measuring Head M3 (maximum load 90kN/jaw)

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 22

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Measuring Head M4 (maximum load 15kN/jaw)

Figure:

Measuring head M4
with warning notice max. 45kN / 3 jaws)
(complies to 15kN / jaw)

By operating M3 or M4 following hints have to be considered:

Operation with 2-jaw chuck:

If operated with 15 or 25mm extension, the 8mm extension must always be
mounted to the unused jaws (at 120° und 240°)
Always fit the extension symmetrically (0° and 180°)
Always mount the Extension Cylinder firmly (screw the Torx screw down tightly)

Operation with 3-jaw chuck:

If operated with 15 or 25mm extension, the 8mm extension must always be
mounted to the unused jaws (180°)
Always fit the extension symmetrically (0°, 120° and 180°)
Always mount the Extension Cylinder firmly (screw the Torx screw down tightly)

Only with original accessories correct measured values are ensured.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 23

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8.2.1 Measuring Head Extension Cylinder for M3 und M4

The Measuring Head Extension Cylinder transmits the tension forces to a load cell located
inside the Measuring Head. For different chuck diameters Extension Cylinders are supplied
which can be easily exchanged to suit. A T15 Torx key is included for loosening and tightening
the screws.

The extension cylinders are to be used as follows:

Jaw chuck (Diameter in mm) 72mm 88mm 108mm
Extension Cylinders in mm 8mm 15mm 25mm

Assembly instructions see chapter 8.2.2

8.2.2 Mounting M3 und M4 Measuring Head

From the safety point of view and to prevent any injury, the Loading Bracket must be
used to put the Measuring Head M3 or M4 into the chuck.

Take the Loading Bracket like shown in the picture
and put the Measuring Head M3 or M4 into it.
After this, the Measuring Head can be insert into
the chuck until the Loading Bracket fit tightly in the
chuck. Now the chuck must be tensioned.

Because of that it is guaranteed, that the
Measuring Head is not tilt and it is in the optimum
measuring position.

Put the Measuring Head like shown into the
chuck.

Is the chuck tensioned, the Loading Bracket have
to be removed.

Please be assured, that prior to measuring procedure the Measuring Head is tight
and plane-parallel clamped to the rotational axis and the Loading Brackets are
removed.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 24

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8.3 Measuring procedere

Starting with the first measurement make sure that the Measuring Head is fully
charged. For this purpose the Measuring Head Power Jack is to be linked to the
Charge receptacle of the Measuring Head (switched off).

On/off switch Power-LED, twinkles when the Measuring Head is active

The unit will start operation by pressing the ON/OFF key for
about 2 seconds if the LED is blinking, the Measuring Head
is switched on.

DC power jack

Figure: Front cover Measuring Head

8.3.1 Static Measuring

For static measuring the Measuring Head is clamped and switched on. After the Handheld Unit
has been switched on, the immediate tension is recorded and indicated on the display.

8.3.2 Dynamic Measuring

After the Measuring Head has been
clamped in a parallel plane (see
chapter 8.2.2) the stand with the
magnetic base must be fastened to
the support of the tool machine and
positioned in such a way that the
lateral distance between the
flattened end of the stand and the
Measuring Head is approximately 3
mm. The distance between the top
of the cover and the edge of the
flattened part of the stand should be
1-2 mm approximately. The stand
should end with the yellow cover of
the Measuring Head before the
steel part begins.

When the Handheld Unit is switched on and rmp measuring is activated, the current gripping
force is determined and shown on the display. When the chuck is rotating at the same time, the
display shows besides the gripping force the corresponding actual number of revolutions

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 25

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If no data is displayed although the Handheld Unit is switched on and the
measurement menu is activated, proceed according chapter 13 Trouble shooting /
FAQ´s.

9 Calibration, Recalibration

The GFT®-X is carefully tested and calibrated on a test bench at the factory. A calibration
certificate is enclosed. This calibration certificate documents the traceability to national
standards, which realize the units of measurement according to the International System of
Units (SI).

The zero point of the Measuring Head could change due to stress (material fatigue) and due to
temperature variation. In a narrow range the measured value can be tared (set to zero) referring

7.6.2.1.
The GFT

®

-X is a calibrated measuring equipment, a recalibration should be performed by the
manufacturer after 12 months of operation. For calibration purpose we will ask you to send the
complete GFT

®

-X unit back to your supplier.

10 Maintenance, Service

The GFT®-X is a measuring device and should therefore be treated very carefully.

Special care must be taken with respect to the Measuring Head extension with its
crowned surface. Due to the gripping forces, this surface might be subject to wear
and tear in the course of time. A replacement is advisable at the latest when a ridge
becomes visible on the disk (spare part numbers see chapter 16)

If problems occur which cannot be solved as described in chapter 13, the complete GFT

®

-X
must be returned to the supplier. A detailed description of the problem will shorten the time to
repair and save costs.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 26

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11 Measured data display / storage on PC

The GFT®-X is supplemented by the capable software module ChuckExplorer. This program
permits transfer of the data displayed and stored on the Handheld Unit to a PC / laptop. A USB
Connecting cable is included in the delivery package.

The gripping force and the corresponding number of revolutions can be graphically represented,
printed and stored on the PC. It is also possible to convert the measuring data into an Excel
spreadsheet and to store the graphical representation as bitmap. These data can then be used
for further processing in any program. This module represents an invaluable tool for
documentation, in particular with regard to a consistent quality management.

11.1 Installing ChuckExplorer

To operate the ChuckExplorer there is no need of detailed computer knowledge. The program
could be installed and runs under standard hardware. The function implemented are tested
under Windows XP and Windows 7.
To install the software please follow the instruction below:

 Switch on the computer and start Windows
 Insert Chuck Explorer disk in the CD-ROM drive

The setup program starts automatically. If it doesn't you can also start the setup manually:

 Open the file manager / explorer
 Start the "AutoRun.exe " program on the ChuckExplorer CD-ROM
 First install USB-driver, then ChuckExplorer.

ChuckExplorer is now ready to be installed, the installation path can be freely chosen.

At the end of this process, a message confirms the successful installation and the program can
be started immediately.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 27

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Startscreen ChuckExplorer (extract)

The menu bar is self-explanatory, i.e. a small info
window will open when the mouse pointer is
positioned on the individual button.

Description of the individual push buttons:

Start a new measurement

Open a saved measurement

Save measurement

Download data from Handheld Unit

Delete internal memory of GFT

®

-X Handheld Unit (all measurement data will be

discarded)

File  New ( ) open a new measurement series. The following screen will be shown:

Command line
Button bar

Display (rpm /
force)

Diagram

Spreadsheet

Handle for
window size

All program and menu windows can be changed in their size, by clicking on the right edge with
the mouse cursor.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 28

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11.2 Using the software

Start ChuckExplorer by double click . With the Comman d line all individual settings can be
performed.

The desired language can also be selected by
Command Extras  Language. Actually, German and
English versions are available.

Equally under Extras  Port the USB port to
communicate with GFT

®

-X Handheld Unit

could be chosen.

Just activate the button Auto scan. As soon
the Handheld Unit is found, the active port
appears at the lower part of the window.

With File  Setup following parameters can be adjusted:
Graphic: By pressing

key a color bulletin appears. Choose

the color you want for the diagram and its background.
Automatic measurement (Automatic mode):

The criteria to take over a measure automatically is the revolving
speed.
Setting Percentaged:
The sample shown left means the speed should be within less than
+/-5% of the maximal speed and should be there for at least 3
seconds.
Setting Fixed:
If the speed is x ±50 [1/min] during the hold time, the measured
value is taken over.

Automatic measurement settings:

 Tolerance [%] ± 1-10%,
 Tolerance [1/min] – freely selectable
 Hold time [s] 1-5sec (0,5sec steps)

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Equally different chuck / collets and Tester can be saved
in the settings.

The first line is reserved by the system.
At the click of a mouse into the field the entries can be
edited. New adds a new entry, Delete erases an entry which
is required no more.

These entries are available in the main window now at
Chuck or Tester and can be called up over the arrow button
( ).

Under Help, you will find information about the current software version as well as
comprehensive explanations concerning the individual software functions (F1) and the terms
used.

GFT-X  Load data: Data to be downloaded from a series
of Handheld Unit measures into ChuckExplorer (see also
chapter 7.6.3).

GFT-X  Delete data: Allows remote deleting of Handheld
Unit memory, it is recommended to do so after every
download to assure having sufficient memory space for next
measurement available.

EditCopy table: To copy the table into the clipboard. The
spreadsheet can be dropped easily in Excel or a Word processing
program for further processing.

EditCopy chart: To copy the displayed diagram into clipboard and
could imported or paste in Bitmap-Format into other programs.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 30

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11.2.1 Measurement

There is a general distinction between two different methods for storing the measured values
with the GFT

®

-X Handheld Unit (see chapter 7.6.3 and 11.3) and directly with the

ChuckExplorer.

If the measured value recording is made directly by the ChuckExplorer, then there is the
possibility of a manual and automatic measured value recording.

In case of manual storing of the measured values, the
user can decide by himself at what rpm value or at what
force he wants to store a value.
When automatic storing is activated, two new input lines
are provided. Here the maximum number of revolutions
(Max speed) and the number of steps are defined, the
program divides the maximum number of revolutions by
the number of the measured values to be stored and
logs them as soon as the relevant numbers of
revolutions are reached (see chapter 11.2.4).

11.2.2 Measurement preparations

Relevant data and parameters can be entered into the program and included into the
measurement log so that a measurement can be documented.

Machine or chuck ID and the name of the Tester are entered on the left side in the upper part of
the program window. Up to 10 names are stored by the program and are available for future
measurements. They can be displayed and selected by clicking on the  button beside the text
field.

The Date field is feeded directly from
the system, however it can be
changed in the same way. This is
necessary e.g. if measuring
sequences stored on the Handheld
Unit are read out only after several
days (see chapter 11.3).

After clicking on the Information tab,
you can enter further parameters (jaw
type, hydraulic pressure, etc.) in the
right-hand part of the display window.
These parameters are recorded
together with the measurement.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 31

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11.2.3 Manual measuring

For starting the measurement, the Measurement tab must be active and the Start button must

be pressed.
The button Start changes to Stop, number of
revolutions and gripping force will be indicated.

By each click on the Record button, a measured value is stored and displayed in the
spreadsheet on the left and in the diagram. The scale of the chart is switched to the optimum
range in order to get a better optical presentation.

If a measuring sequence is complete, it can be stored on hard disk Stop, File  Save.

force Gripping force in percent from
and rotational speed reference value (measure number 0)

11.2.4 Automatic measuring

If check box Automatic ; is activated, two new input fields
are displayed. Here you can enter the maximum number
of revolutions (Max speed) and the number of
measurement steps. The software will then determine
automatically the equidistant numbers of revolutions
(1/min) for which the measured value is to be stored.

The rpm tolerance and the minimum time during which the
rpm value must be constant within the tolerance range can
be set in menu item Setup (see chapter 11.2).
The measurement is started by the Start button. If the
maximum number of revolutions is reached, the program
will automatically terminate the measurement and display
the corresponding table of values and the graphical
evaluation.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 32

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11.3 Download data from GFT®-X Handheld Unit

Measurements recorded by a series of measurements (chapter 7.5.3) and saved in the internal
memory of the GFT

®

-X Handheld Unit, can be downloaded directly from the Handheld Unit with
GFT-X  Download and afterwards indicated. If several IDs and / or series of measurements
transferred, they are shown as different tabs.

A backup of data of the indicated series of measurements is necessary before. Choose
therefore File  Save... or Save as.

After download and the backup of data on the PC, data memory of GFT

®

-X Handheld Unit can

be deleted completely with GFT-X  Delete memory.

11.4 Loading and saving files

Choose File  Save to save your recorded data. The directory is user-defined, files end with
*.gft. Will be several series of measurements (Files) downloaded from GFT

®

-X Handheld Unit,

the active tab will be saved.

Do not store the measuring data in the program directory of the ChuckExplorer or in
a subdirectory of it. If ChuckExplorer will be uninstalled, these data files are erased,
too.

Choose File  Open to open an existing data file. The filename appears in the tab bar.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 33

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12 Software update

The software of the GFT®-X handheld unit is improved constantly and is subject to certain
changes. The actual software version will be displayed in the Welcome Logo. Starting with
version 1.2 online update is possible, older versions need to be updated at the manufacturer.

To start the update please follow the instruction below:

 Switch on the computer and start Windows
 Check if your computer is connected to the Internet
 Close the chuck Explorer Software
 Insert Chuck Explorer disk in the CD-ROM drive

The setup program starts automatically. If not you
can also start the setup manually:

 Open the file manager / explorer
 Start the "AutoRun.exe " program on the

ChuckExplorer CD-ROM
Choose Online Update GFT-X and perform the

instructions step by step, otherwise the update
could fail.

The online update starts in a separate
window. At the right side, the state of the
update is shown.
A bar chart that shows the progress of
each step of the program is located at the
bottom of the window.

It will take 20 minutes to update the
Handheld Unit.
Please make sure, your GFT

®

-X Handheld
Unit is connected via USB to your
computer and switched on.

The update starts by pressing the Update GFT-X button.

Do not disconnect the USB connection during
the update, otherwise a factory service will be
necessary.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 34

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Now the update program is connected with
the Handheld Unit.
Available software updates are to be
download from the Internet and saved
temporarily.

A short press on the ON / OFF Button starts the
update procedere.

First the Handheld Unit firmware will be
updated.

During this process do not interrupt the
USB connection between Handheld Unit
and Computer.

Should that happen, please send the
device with a corresponding note to the
service center.

Now, the graphic files will be transferred to the
Handheld Unit.

Should the USB connection be interrupted during
this process, start the update once again.

The update of the graphics files will take about 15
minutes.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 35

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This message appears after successful update.
After pressing the OK button, the unit can be used

for measurement again.

It is advisable to check periodically your suppliers website for updates.

12.1 Problems with the Update of the GFT-X Handheld Unit cause / corrective

This error can be caused by different causes:

 Check, whether the Handheld Unit is

switched on

 Check, whether the Handheld Unit is

correctly connected to computer via USB

 Check whether another USB device with

same chipset may blocks the connection

 check whether the USB driver has been

installed correctly, if necessary, install it
from the ChuckExplorer CD-ROM

 check that the Chuck Explorer program is

closed.

Data is sent from the computer to the Handheld
Unit, the programm cannot be closed. Please wait
until the update is finished.

Please repeat the update process. If the update
fails again so please send the device with a
corresponding error description to the service
center.

This message appears if the user correctly cancels the update
operation. This is no fault notice.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 36

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13 Trouble shooting / FAQ´s

13.1 Problems at GFT®-X Handheld Unit cause / corrective

Display will not be illuminated / start after pressing the power button

 Check power supply, recharge Handheld Unit battery
 Press power button again (not less than 2 sec.) until blue LED indicator begins to flash
 Connect Handheld Unit via USB-cable to mains adapter or PC, try again

Keypad is not responding to keystrokes

 Switch off Handheld Unit, wait approx. 5 seconds, then turn power on again

Icon radio communications in Status Line is / keeps staying red

 White LED indicator at Measuring Head front face must flash, if not try to recharge

Measuring Head battery

 Radio interferences, e.g through shielding or (metal) absorption, relocate
 Wrong Measuring Head selected / activate appropriate serial number again

Tare-icon in status bar is red

 Offset of the Measuring Head is too high, tare is not possible any more. Measuring Head

has to recalibrated by the vendor

During the measurement dashes appear in the display of the Handheld Unit

 Battery in Measuring Head empty / discharged
 Radio interferences

Blue LED indicator at Handheld Unit is flashing

 Screen saver is active, press any key to continue (except ON/OFF-key)

How to allocate the Speed Buttons

 Select desired function, then press Speed Button until icon appears in the Speed Button

bar.

 Selected Speed Button function can not be deleted, only overwrite possible

Right Speed Button can not allocated to other functions

 Right Speed Button reserved for function "Charge Battery" only.

13.2 Problems with Chuck Explorer – cause / corrective

Data download not possible

 No connection from GFT

®

-X Handheld Unit to PC, check

USB-interface cable

 Check interface settings in ChuckExplorer: is COM Port

selected?

 Check whether the Handheld Unit is switches on

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 37

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After pressing the start-button an error message appears

 Check if proper Measuring Head is activated
 Check power of Measuring Head – white LED

indicator must flash

 Check whether the Handheld Unit is switches

on

 Check interface settings in ChuckExplorer: is

COM Port selected?

Port Selection - Auto Scan

 Reboot ChuckExplorer, then choose

Extras  Port  Auto Scan

 Check whether the Handheld Unit is

switches on

 No connection from GFT

®

-X Handheld

Unit to PC, check USB-interface cable

Speed (rpm) will not displayed in online-mode

 Due to the Refresh-Rate the Speed of rotation rpm it could happen during machine

stillstand. However when late is turning again the indication should appear properly.

Error when starting a new measurement

 choose Extras  Port  Auto Scan
 No connection from GFT

®

-X Handheld Unit

to PC, check USB-interface cable

Error message: "During the first measurement gripping force must be above zero"

 To afford a calculation of the percentage

aberration, the first measured gripping force must
be above zero.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 38

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14 How to change the power plug at mains adapter

The GFT®-X Handheld Unit is powered with a Power Supply Plug at 5VDC (500mA), the input
voltage range is 100~240V.
Different interchangeable blade assemblies of North America, United Kingdom, Australia and
Europe are included. The blade assembly of Europe is already mounted.

Insert the blade assembly (as shown in following figures):

 Hold the power supply in one hand using thumb or finger, slide the spring loaded locking

key downwards (it is marked with an arrow, Picture 1).

 Hold the locking pin down pull upward on the blade to remove (Picture 2).

Picture 1 Picture 2

 Insert now the required blade assembly:

Picture 3 Picture 4 Picture 5 Picture 6

 Insert the tip of the blade assembly into the power supply at a 30 – 60 degree angle

(Picture 3). The top edge of the blade assembly is flat and the bottom edge is U-shaped.
The power supply has the corresponding shapes.

 Push the blade assembly into the power supply in a downward motion (Picture 4)
 Push the blade assembly down until the blade assembly locks in place. A clicking sound

will occur (Picture 5).

 Checking the blade assembly for correct insertion: Hold the power supply in one hand.

Using another hand pull up on the blade (Picture 6).

Note: The blade assembly is "finger proof" which meets UL requirements against all
shock hazards.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 39

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15 Changing the battery of the Handheld Unit

Furthermore GFT-X is equipped with a
powerful Lithium-Ion battery. A one time
charge allows an operation up to 5 hours.
During this time frame, a Measuring Head
can be loaded up to 4 times out of the
Handheld Unit battery.

Technical Data:

Li-Ion rechargeable battery,
1950mAh, 3.7V

Safety Instructions:

 do not incinerate
 do not disassemble
 do not short terminals
 do not expose to high

temperature

For replacement of the Li-Ion battery open the battery box
on the back side of the GFT

®

-X handheld unit. For this
purpose, please use a suitable screwdriver or a 20 cent
coin

Remove the battery carefully and separate the plug
connector. Therefore press the latch battery-sided
downwards and separate plug and socket (see yellow
pictograph).

Connect the new battery with the plug inside the GFT

®

-X
Handheld Unit. Insert the battery as shown beside into the
housing and close the battery cover carefully.

Recharge the battery before first use completely.

Gripping Force Tester GFT®-X 270 Rev. 1.8/1.5 12/2012 page 40

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16 Accessories / spare parts list

Item Id. Bezeichnung

203819 GFT®-X complete incl. case, Measuring Head M3 and Handheld Unit

- GFT

®

-X case (case only)

204003 GFT

®

-X Handheld Unit

204004 GFT or GFT

®

-X Measuring Head M1 (optional)

204005 GFT or GFT

®

-X Measuring Head M2 (optional)

204006 GFT or GFT

®

-X Measuring Head M3 (standard)
204007 GFT®-X Measuring Head M4
204008 CD with ChuckExplorer and operating instructions

201764 Power Supply Plug USB incl. interchangeable blade assemblies
196839N Loading Bracket for GFT or GFT

®

-X

198161 Recharging cable for GFT or GFT

®

-X, 1m, Push-Pull

201765 USB-cable for GFT

®

-X, 1.5m

036201 Extension Cylinders 8mm for GFT or GFT

®

-X

036203 Extension Cylinders 15mm for GFT or GFT

®

-X

036205 Extension Cylinders 25mm for GFT or GFT

®

-X

201766 Stand with magnetic mounting for GFT or GFT

®

-X
085961 Torx-key for GFT or GFT®-X M3 and M4
033010 Spare screws
201922 Protector for GFT®-X Handheld Unit
201923 Spare battery for GFT®-X Handheld Unit

Prices and delivery times on request! Please contact your local vendor.