MTS 646 User Manual

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Series 646 Hydraulic Collet Grips

Product Information

Model 646.10

Model 646.25

011-558-204 H

MTS is a registered trademark of MTS Systems Corporation within the United States. This trademark may be protected in other countries.

Molykote is a registered trademark of Dow Chemical Corporation. All other trademarks or service marks are property of their respective owners.

Publication information	MANUAL PART NUMBER	PUBLICATION DATE

	011-558-204 B	May 1991

	011-558-204 C	February 2001

	011-558-204 D	June 2001

	011-558-204 E	April 2004

	011-558-204 F	March 2008

	011-558-204 G	April 2009

	011-558-204 H	August 2012

2	Manual Template 4.3

Contents

Technical Support			5

How to Get Technical Support					5
Before You Contact MTS				5
If You Contact MTS by Phone					7
Problem Submittal Form in MTS Manuals						8
Preface 9

Before You Begin 9
Conventions	10
Documentation Conventions					10
Introduction	13

Series 646 Hydraulic Collet Grips Component Identification 14
About Series 646 Hydraulic Collet Grips						16
About Gripping Specimens				16
Collet Sets		16
Spiral Washers			16
Couplings		17
Specifications	18

Series 646 Hydraulic Collet Grips Dimensions 18

Model 646 Grip with Furnace Extensions Dimensions 19

Series 646	Hydraulic Collet Grips Force and Torque Capacities 20
Series 646	Hydraulic Collet Grips Specifications—Round Specimens 22
Series 646	Hydraulic Collet Grips Specifications—Flat Specimens 23
Series 646	Hydraulic Collet Grips Specifications—Threaded Specimens 24

Safety Information 25

General Safety Practices: Grips and Fixtures 25

General Precautions for Environmental Components 30

Hazard Placard Placement 30

Series 646 Hydraulic Collet Grips

Contents

Installation	33

646 Hydraulic Grip Lift Points				33
About Axial Grip Installation				34
Axial Grip Installation Procedure					36
About Axial-Torsional Grip Installation							40
Axial Torsional Grip Installation Procedure								41
Grip Alignment		45
How to Preload the Spiral Washers					45
Grip Water Cooling Assembly Configurations for Servohydraulic Frames 48
Operation 51

Determine the Gripping Pressure					52
Grip Alignment Markings			54
Installing a Collet for a Round Specimen							55
Installing a Collet for a Flat Specimen						56
Installing a Collet for a Threaded Specimen								57
Installing a Round or Flat Specimen						59
Installing a Threaded Specimen				60
Adjust Water Cooling Flow			62
Removing Specimen 63
Maintenance	65

Hydraulic Hoses and Fittings				65
Collets	65
Water Cooling Components			65
Daily Inspections		65

Contents

Series 646 Hydraulic Collet Grips

Technical Support

How to Get Technical Support

Start with your manuals

Technical support methods

www.mts.com

E-mail

Telephone

The manuals supplied by MTS provide most of the information you need to use and maintain your equipment. If your equipment includes software, look for online help and README files that contain additional product information.

If you cannot find answers to your technical questions from these sources, you can use the Internet, e-mail, telephone, or fax to contact MTS for assistance.

MTS provides a full range of support services after your system is installed. If you have any questions about a system or product, contact Technical Support in one of the following ways.

The web site provides access to our technical support staff by means of an onlineform:

www.mts.com > Contact MTS > Service & Technical Support button

tech.support@mts.com

MTS Call Center 800-328-2255

Weekdays 7:00 A.M. to 5:00 P.M., Central Time

Fax 952-937-4515

Please include “Technical Support” in the subject line.

Outside the U.S. For technical support outside the United States, contact your local sales and service office. For a list of worldwide sales and service locations and contact information, use the Global MTS link at the MTS web site:

www.mts.com > Global MTS > (choose your region in the right-hand column) > (choose the location closest to you)

Before You Contact MTS

Know your site number and system number

MTS can help you more efficiently if you have the following information available when you contact us for support.

The site number contains your company number and identifies your equipment type (such as material testing or simulation). The number is typically written on a label on your equipment before the system leaves MTS. If you do not know your MTS site number, contact your sales engineer.

Example site number: 571167

When you have more than one MTS system, the system job number identifies your system. You can find your job number in your order paperwork.

Example system number: US1.42460

Series 646 Hydraulic Collet Grips

Technical Support

Know information from prior technical assistance

Identify the problem

Know relevant computer information

Know relevant software information

If you have contacted MTS about this problem before, we can recall your file based on the:

•MTS notification number

•Name of the person who helped you

Describe the problem and know the answers to the following questions:

•How long and how often has the problem occurred?

•Can you reproduce the problem?

•Were any hardware or software changes made to the system before the problem started?

•What are the equipment model numbers?

•What is the controller model (if applicable)?

•What is the system configuration?

For a computer problem, have the following information available:

•Manufacturer’s name and model number

•Operating software type and service patch information

•Amount of system memory

•Amount of free space on the hard drive where the application resides

•Current status of hard-drive fragmentation

•Connection status to a corporate network

For software application problems, have the following information available:

•The software application’s name, version number, build number, and (if available) software patch number. This information can typically be found in the About selection in the Help menu.

•The names of other applications on your computer, such as:

–Anti-virus software

–Screen savers

–Keyboard enhancers

–Print spoolers

–Messaging applications

Technical Support

Series 646 Hydraulic Collet Grips

If You Contact MTS by Phone

A Call Center agent registers your call before connecting you with a technical support specialist. The agent asks you for your:

•Site number

•Name

•Company name

•Company address

•Phone number where you can be reached

Identify system type

Be prepared to troubleshoot

Write down relevant information

After you call

If your issue has a notification number, please provide that number. A new issue will be assigned a unique notification number.

To enable the Call Center agent to connect you with the most qualified technical support specialist available, identify your system as one of the following types:

•Electromechanical material test system

•Hydromechanical material test system

•Vehicle test system

•Vehicle component test system

•Aero test system

Prepare to perform troubleshooting while on the phone:

•Call from a telephone close to the system so that you can implement suggestions made over the phone.

•Have the original operating and application software media available.

•If you are not familiar with all aspects of the equipment operation, have an experienced user nearby to assist you.

In case Technical Support must call you:

•Verify the notification number.

•Record the name of the person who helped you.

•Write down any specific instructions.

MTS logs and tracks all calls to ensure that you receive assistance for your problem or request. If you have questions about the status of your problem or have additional information to report, please contact Technical Support again and provide your original notification number.

Series 646 Hydraulic Collet Grips

Technical Support

Problem Submittal Form in MTS Manuals

Use the Problem Submittal Form to communicate problems with your software, hardware, manuals, or service that are not resolved to your satisfaction through the technical support process. The form includes check boxes that allow you to indicate the urgency of your problem and your expectation of an acceptable response time. We guarantee a timely response—your feedback is important to us.

Access the Problem Submittal Form:

•In the back of many MTS manuals (postage paid form to be mailed to MTS)

•www.mts.com > Contact Us > Problem Submittal Form button (electronic form to be e-mailed to MTS)

Technical Support

Series 646 Hydraulic Collet Grips

Preface

Before You Begin

Safety first!

Other MTS manuals

Before you use your MTS product or system, read and understand the Safety manual and any other safety information provided with your system. Improper installation, operation, or maintenance can result in hazardous conditions that can cause severe personal injury or death, or damage to your equipment and specimen. Again, read and understand the safety information provided with your system before you continue. It is very important that you remain aware of hazards that apply to your system.

In addition to this manual, you may receive additional manuals in paper or electronic form.

You may also receive an MTS System Documentation CD. It contains an electronic copy of the manuals that pertain to your test system, such as:

•Hydraulic and mechanical component manuals

•Assembly drawings

•Parts lists

•Operation manual

•Preventive maintenance manual

Controller and application software manuals are typically included on the software CD distribution disc(s).

Series 646 Hydraulic Collet Grips

Preface

Conventions

Documentation Conventions

Hazard conventions

Notes

Special terms

Illustrations

Electronic manual conventions

The following paragraphs describe some of the conventions that are used in your MTS manuals.

Hazard notices may be embedded in this manual. These notices contain safety information that is specific to the activity to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow all directions and recommendations. Three different levels of hazard notices may appear in your manuals. Following are examples of all three levels.

Note For general safety information, see the safety information provided with your system.

DANGER

Danger notices indicate the presence of a hazard with a high level of risk which, if ignored, will result in death, severe personal injury, or substantial property damage.

WARNING

Warning notices indicate the presence of a hazard with a medium level of risk which, if ignored, can result in death, severe personal injury, or substantial property damage.

CAUTION

Caution notices indicate the presence of a hazard with a low level of risk which, if ignored, could cause moderate or minor personal injury or equipment damage, or could endanger test integrity.

Notes provide additional information about operating your system or highlight easily overlooked items. For example:

Note Resources that are put back on the hardware lists show up at the end of the list.

The first occurrence of special terms is shown in italics.

Illustrations appear in this manual to clarify text. They are examples only and do not necessarily represent your actual system configuration, test application, or software.

This manual is available as an electronic document in the Portable Document File (PDF) format. It can be viewed on any computer that has Adobe Acrobat Reader installed.

Preface

Series 646 Hydraulic Collet Grips

Conventions

Hypertext links The electronic document has many hypertext links displayed in a blue font. All blue words in the body text, along with all contents entries and index page numbers, are hypertext links. When you click a hypertext link, the application jumps to the corresponding topic.

Series 646 Hydraulic Collet Grips

Preface

Conventions

Preface

Series 646 Hydraulic Collet Grips

Introduction

Contents

What you need to know

Series 646 Hydraulic Collet Grips Component Identification

Shim

Spiral

Washers

Threaded

Mounting

Stud

Force Transducer (attached to the load unit crosshead)

Upper Grip

Adapter

Plate

Upper

Coupling

Collets

Hydraulic Pressure

and Return Ports

Threaded
Mounting Stud	Lower Grip	Lower
		Coupling
Spiral	Actuator
Washers	Actuator
Washers	Rod
Shim	Rod
Shim
	Load Unit
	Base Plate
Axial Grip Mounting		Axial/Torsional Grip Mounting

Introduction

Series 646 Hydraulic Collet Grips

	Hydraulic Grip Components
ITEM	DESCRIPTION

Load unit crosshead and	Provides the structure to mount the grips and other components in the force
base plate	train. It is also the reaction mass for the force train. The crosshead and base
	plate are connected with columns.

Force transducer	Measures the axial forces applied to the specimen. An axial-torsional version
	also measures the rotational forces applied to the specimen.
	The force transducer can be located in the base or the crosshead of the load
	unit.

Hydraulic pressure	Ports the hydraulic fluid to and from the grips. The hydraulic fluid comes from
and return lines	a dedicated hydraulic grip supply that produces 45 MPa (6500 psi). Each grip
	has two hydraulic lines connected to it, a hydraulic pressure line and a
	hydraulic return line.

Upper and lower grips	Clamps a specimen in place. The grips house the collets and the hydraulic
	components that operate the grips.

Collet	Contacts and holds the specimen in place. Collets are available for flat, round,
	and threaded specimens.

Actuator rod	Applies axial forces to a specimen. The actuator is a hydraulically powered
	device that provides linear displacement of (or forces into) a specimen. For
	axial-torsional systems, the actuator applies both axial and torsional forces to
	the specimen.
	The actuator rod can be located in the base or the crosshead of the load unit.

Axial attachment kit	Includes the required components to install the grips. Each grip model/load
	unit model combination has a unique attachment kit.

Shims	Allows further rotation of the grips to change the orientation of the spiral
	washers so the appropriate opening is set. When axial grips are installed, the
	upper and lower grips might not be aligned after being screwed onto the
	mounting studs. Shims can be added so that the amount of rotation can be
	changed. The shims are available in thicknesses that correspond with 1/8 to 1/2
	turns of rotation.

Spiral washers	Ensures preloading without inducing offsets in the force train. They provide a
	backlash-free union of threaded components.

Mounting stud	Mounts the grips to the other components in the force train. Connector studs
	are threaded rods that connect the grips with an actuator rod or force
	transducer.

Adapter plate	Allows axial-torsional grips to be mounted to a force transducer. The adapter
	provides the thread needed to use the couplings.

Upper and lower	Clamps the grips to the to the actuator and force transducer. The couplings
couplings	have left and right handed threads that preload the grip connection and
	prevents backlash in the force train.

Series 646 Hydraulic Collet Grips

Introduction

About Series 646 Hydraulic Collet Grips

The Series 646 Hydraulic Collet Grips are mounted in a load unit to secure the specimen under test. Hydraulic pressure to the grips is supplied by an external hydraulic grip supply.

Grip Housing	Collet

	Hydraulic
	Release
	Port
	Hydraulic
	Pressure
	Port
Grip Piston	Preload Chamber

Grip Cross Section

About Gripping Specimens

The grips provide a constant, hydraulically actuated gripping force regardless of the applied test loads. When hydraulic pressure is applied, it pulls the grip housing towards the piston, forcing the collet to clamp the specimen. The pressure applied to the preload chamber locks all moving grip parts in position. This eliminates backlash when cycling between tension and compression.

The specimen gripping force is adjustable to prevent specimen damage by the grips or specimen slippage during the test. Each grip (upper and lower) is independently actuated.

Collet Sets

The grips require collet inserts to accommodate the type of specimen. Various specimen geometries may be easily accommodated by changing only the collet sets. Three types of collets are available; round, flat, and threaded.

Spiral Washers

The optional Model 601 Spiral Washers are commonly used when installing axial grips. They provide fatigue-resistant connections between elements of the force train and minimize the effects of backlash.

The spiral washers are placed over the connector studs and adjusted to place a constant preload on the stud. The spiral washers also minimize the possibility of backlash due to loose-fitting or worn stud threads. When cyclic loads below the tensile force level of the preload are applied to the connections, the load is

Introduction

Series 646 Hydraulic Collet Grips

distributed between the surfaces of the spiral washers and the stud in a ratio of the relative stiffness of the parts. The spiral washers have a large surface area and therefore greater stiffness. They react to most of the load and keep the stress in the stud below its fatigue runout level.

Couplings

Special upper and lower couplings clamp the grips to the actuator and force transducer for axial-torsional grips. Each coupling has two different thread patterns; a right hand thread with a pitch of 3 mm and a left hand thread with a 2 mm pitch. Half of the coupling matches the thread of the grip and the other half matches the thread of the actuator or force transducer adapter. Each coupling is marked to indicate which direction to tighten it and how much torque to lock it down.

Series 646 Hydraulic Collet Grips

Introduction

Specifications

Contents	Series 646	Hydraulic Collet Grips Dimensions 18
	Series 646	Hydraulic Collet Grips Force and Torque Capacities 20
	Series 646	Hydraulic Collet Grips Specifications—Round Specimens 22
	Series 646	Hydraulic Collet Grips Specifications—Flat Specimens 23

Series 646 Hydraulic Collet Grips Specifications—Threaded Specimens 24

Series 646 Hydraulic Collet Grips Dimensions

The following sections provide the dimensions of the Series 646 Hydraulic Collet

Grips.

Series 646 Collet Grip Dimensions

MODEL		A	B	C	CONNECTOR STUD

646.10	Axial	107.4 mm	171.5 mm	4.0–7.2 mm	M27 x 2
		(4.23 in)	(6.75 in)	(0.16–0.28 in)	(1-14)

646.25	Axial	171.7 mm	254 mm	4.6–9.4 mm	36 x 2
		(6.76 in)	(10.0 in)	(0.18–0.37 in)	(1 1/2-12)

646.10	Axial/Torsional	107.4 mm	171.5 mm	36.5–39.6 mm	M68 x 2*
		(4.23 in)	(6.75 in)	(1.44–1.56 in)	-

646.25	Axial/Torsional	171.7 mm	254 mm	54.1–58.9 mm	M92 x 3*
		(6.76 in)	(10.0 in)	(2.13–2.32 in)	-

*Left Handed Threads

Introduction

Series 646 Hydraulic Collet Grips

Specifications

Model 646 Grip with Furnace Extensions Dimensions

Mounting holes in the base of each grip are threaded in either SI International (millimeter) or U.S. Customary (inch) thread dimensions, as shown for dimension “A” in the pervious table.

PARAMETER	DIMENSION*
A (mounting threads)	M27 x 2mm or 1 in–14

B	172 mm (6.77 in)

C	224 mm (8.80 in)

D	115 mm (4.52 in)

E (wrench flats)	29 mm (1.125 in)

F (travel)	3.2 mm (0.125 in)

G (specimen adapter wrench flats)	32 mm (1.25 in)

H (maximum diameter)	38 mm (1.5 in)

Weight (each grip)	18.5 kg (40.8 lb)

*SI International (U.S. Customary)

Series 646 Hydraulic Collet Grips

Introduction

Specifications

Series 646 Hydraulic Collet Grips Force and Torque Capacities

The amount of torque the grips can produce is reduced with biaxial operation. The amount of torque is affected by the amount of axial force and the size of the specimen. The following graphs illustrate the axial-torsional performance envelope of the Model 646.10 and Model 646.25 Hydraulic Collet Grips.

Series 646 Collet Grip Specifications

MODEL		AXIAL CAPACITY*	TORSIONAL CAPACITY*	WEIGHT
646.10	Axial	100 kN (22 kip)	–	18 kg (40 lb)

646.25	Axial	250 kN (55 kip)	–	72 kg (160 lb)

646.10	Axial/Torsional	100 kN (22 kip)	1100 N·m (10,000 lbf·in)	18 kg (40 lb)

646.25	Axial/Torsional	250 kN (55 kip)	2200 N·m (20,000 lbf·in)	72 kg (160 lb)

*Ratings are at 45 MPa (6500 psi).

	10000
	9000										Specimen
											Specimen
	8000										Diameter
	8000
	7000										6 mm dia
	7000										.25" dia
											.25" dia
(in-lbs)	6000										.375 " dia
(in-lbs)	6000										15 mm dia
											.5" dia
Torque	5000										.75" dia
Torque

	4000										20 mm dia
											1" dia
	3000										30 mm dia
	2000
	1000
	0
	2000	4000	6000	8000	10000	12000	14000	16000	18000	20000	22000

Force (lbs)

Model 646.10 Maximum Torque versus Axial Load

Introduction

Series 646 Hydraulic Collet Grips

Specifications

	20000										Specimen
											Specimen
											Diameter
	15000										.25 " dia
	15000										.375" dia
											.375" dia
lbs)											.5" dia
lbs)											.75" dia
-											20 mm dia
(in	10000										20 mm dia
(in
Torque
Torque
	5000
	0
	2000	4000	6000	8000	10000	12000	14000	16000	18000	20000	22000

Force (lbs)

Model 646.25 Maximum Torque versus Axial Load

Note The Series 646.25 Axial-Torsional Grips are capable of holding full torque and full load with specimen sizes greater than 24.6 mm (0.97 in).

Series 646 Hydraulic Collet Grips

Introduction

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