HEIDENHAIN PT 880 User Manual
Operating Instructions
POSITIP 880
English (en)
12/2008
POSITIP 880 Back View
Axis ports
Edge finder
Ground
Power button
Main power input
Keypad and soft keys
4 axis keys to select between X, Y
and Z axes
Parallel port
Auxiliary
Machine
Interface
connector
Serial
port
Remote
console
Clear entry or
error messages
Incremental dimensions
Keys for selecting operating mode
(for detailed description of these key
functions, see Operating Modes in
chapter I-2)
Soft keys - Row of keys under the screen
of the POSITIP whose functions vary
according to associated fields that appear
above them on the screen
Numeric input keys
Change negative/positive
value key
Confirm entry
Select entry fields
General Notes
Software version
The software version of your unit is shown on the initial power up
screen and on the prompt bar after pressing the Help soft key.
This User's Manual covers the functions of the POSITIP
880 for both milling and turning applications. Basic
POSITIP 880 functions are covered in the first 4 chapters
of this manual. The turning section deals only with the
functions specific to turning applications.
About this manual
This manual is divided into two parts:
Part I: Operating Instructions
Part II: Technical Information
Operating Instructions
When using the POSITIP 880 in your work, you need only refer to the
Operating Instructions (Part I).
If you're new to POSITIP 880, you can use the operating instructions
as a step-by-step workbook. This part begins with a short introduction
to the basics of coordinate systems and position feedback, and
provides an overview of the available features. Each feature is
explained in detail, using an example which you can immediately try
out on the machine — so you won't get "lost" in the theory. As a
beginner you should work through all the examples presented.
If you're already familiar with POSITIP 880, you can use the
Operating Instructions as a comprehensive review and reference
guide.
General Notes
Technical Information
If you are interfacing the POSITIP 880 to a machine or wish to use the
data interfaces, refer to the technical information in Part II.
Dialog flowcharts
Dialog flowcharts are used for each example in this manual. They are
laid out as follows:
POSITIP 880 3
PROMPT
KEY
This area explains the key function or work step. If
necessary, supplementary information will also be
included.
General Notes
If there is an arrow at the end of the flowchart, this means that it
continues on the next page.
A perforated line indicates an alternative method of carrying out the
given function.
A prompt appears with some actions (not always) in the message bar
on the screen.
Important Notes in this Manual
Special green note boxes contain especially important information.
Please pay special attention to these notes. Neglecting this
information can result in e.g. functions not working in the desired way
or in causing damage to the workpiece or to the tool.
4
Symbols within the notes
Every note is marked with a symbol on the left informing about the
meaning of the note.
General Information
e.g. on the behavior of the POSITIP 880.
Warning – Refer to accompanying documents
e.g. when a special tool is required for a function.
Caution - Risk of electric shock
e.g. when opening a housing.
General Notes
POSITIP 880 5
I Operating Instructions ..... 11
I – 1 Fundamentals of Positioning ..... 12
Coordinate Systems ..... 12
Setting the Datum ..... 13
Nominal Position, Actual Position and Distance-To-Go ..... 14
Absolute Workpiece Positions ..... 15
Incremental Workpiece Positions ..... 15
Position Encoders ..... 17
Reference Marks ..... 17
Angle Reference Axis ..... 18
I – 2 Working with POSITIP 880 – First Steps ..... 19
Power Up ..... 19
Before You Start ..... 19
Operating Modes ..... 21
On-Screen Operating Instructions (HELP Mode) ..... 22
Confirming Your Changes ..... 22
Messages ..... 23
Error messages ..... 23
Selecting the Unit of Measure ..... 24
Selecting the Angle Format ..... 24
Tool Table ..... 24
Calling the Tool Data ..... 25
I – 3 Actual Value ..... 26
Datum Setting: Approaching Positions and Entering Actual Values ..... 26
Probing Functions for Datum Setting ..... 28
Datum Setting with a Tool ..... 34
I – 4 Distance-To-Go ..... 36
Displaying and Moving to Positions ..... 36
I – 5 Milling Patterns ..... 43
Circle Pattern ..... 43
Linear Pattern ..... 46
Milling a Rectangle Pocket ..... 49
POSITIP 880 7
I – 6 Programming POSITIP 880 ..... 53
Program Capabilities ..... 53
Editing and moving through a program ..... 53
Programming Features ..... 54
Tool Call ..... 56
Datum Call ..... 57
Presets ..... 58
Hole Patterns and Rectangle Patterns ..... 59
Subprograms ..... 59
Labels ..... 59
Label Number ..... 60
Label Call ..... 60
Position Drill ..... 62
Milling a Line ..... 63
Milling an Arc ..... 64
Blend ..... 66
Chamfer ..... 68
File Operation Soft Keys ..... 70
Loading, saving, deleting & clearing a program ..... 70
Directories ..... 71
Importing a Program ..... 73
Exporting a Program ..... 74
Block Function Soft Keys ..... 74
I – 7 Executing a Program ..... 78
Program views ..... 80
Contour View ..... 81
I – 8 INFO Screen ..... 83
JOB SETUP Menu ..... 83
Tool Table Usage ..... 85
Installation Menu ..... 92
Calculator ..... 92
Language ..... 95
Inch/MM ..... 95
8
I – 9 POSITIP 880 Turning Functions ..... 96
Power Up ..... 96
Fundamentals of Positioning ..... 97
Job Setup for Turning Applications ..... 98
Tool Table Usage ..... 99
Tool Offsetting ..... 102
NOTE/SET Function ..... 103
Datum Setting ..... 104
Taper Calculator ..... 104
Programming Turning Functions for POSITIP 880 ..... 106
Programming Features Soft Keys ..... 106
Multipass ..... 107
File Operation Soft Keys ..... 108
Block Function Soft Keys ..... 109
POSITIP 880 9
II Technical Information ..... 111
II – 1 Installation and Electrical Connection ..... 112
Items Supplied ..... 112
Mounting Location ..... 112
Installation ..... 112
Connecting the Encoders ..... 114
Connecting an Edge Finder ..... 115
II – 2 Installation Setup ..... 116
Initial switch-on ..... 116
General field/form navigation guide ..... 117
Axes Configuration ..... 117
Encoder Setup ..... 118
Error Compensation ..... 119
Linear Error Compensation ..... 120
Non-Linear Error Compensation ..... 121
Serial Port (X31) ..... 123
Parallel Port (X32) ..... 123
Protection ..... 124
Counter Settings ..... 124
Diagnostics ..... 125
AMI (Auxiliary Machine Interface)(X51) (Optional) ..... 126
Remote Console (X61) (Optional) ..... 127
II – 3 Encoders and Measured Value Display ..... 128
Setting the display step with rotary encoders ..... 129
II – 4 Data Interface ..... 130
II – 5 Measured Value Output ..... 135
Examples of character output at the data interface ..... 135
II – 6 Specifications for Milling ..... 139
II – 7 Specifications for Turning ..... 141
II – 8 Dimensions ..... 143
II – 9 Accessories ..... 144
Accessory ID Numbers ..... 144
POSITIP 880 Mounting Instructions
Universal Mounting Arm
ld. Nr. 382 929-01 ..... 145
POSITIP 880 Mounting Instructions
Mounting base
ld. Nr. 382 892-01 ..... 146
POSITIP 880 Mounting Instructions
Tilt/Swivel Mount
ld. Nr. 382 891-01 ..... 147
10
Operating Instructions
POSITIP 880 11
I – 1 Fundamentals of Positioning
You can skip over this chapter if you are familiar with the
concepts of coordinate systems, incremental and absolute
dimensions, nominal and actual positions, and distance-togo.
Coordinate Systems
In order to define positions on a surface, a reference system is
required.
For example, positions on the earth's surface can be defined
absolutely by their geographic coordinates of longitude and latitude. In
contrast to the relative definition of a position that is referenced to a
known location, the network of horizontal and vertical lines on the
globe constitute an absolute reference system. See Fig. I.1.
I – 1 Fundamentals of Positioning
On a milling machine, workpieces are normally machined according to
a workpiece-based Cartesian coordinate system (a rectangular
coordinate system named after the French mathematician and
philosopher Renatus Cartesius, who lived from 1596 to 1650). The
Cartesian coordinate system is based on three coordinate axes
designated X, Y and Z which are parallel to the machine guideways.
The figure to the right (Fig. I.2) illustrates the right-hand rule for
remembering the three axis directions: the middle finger is pointing in
the positive direction of the tool axis from the workpiece toward the
tool (the Z axis), the thumb is pointing in the positive X direction, and
the index finger in the positive Y direction.
Fig. I.1 The geographic coordinate system is an
absolute reference system
Fig. I.2 Designations and directions of the axes on a
milling machine
12 I Operating Instructions
Setting the Datum
The workpiece drawing (Fig. I.3) identifies a certain point on the
workpiece (usually a corner) as the absolute datum and perhaps one
or more other points as relative datums.
The datum setting procedure establishes these points as the origin of
the absolute or relative coordinate systems: The workpiece, which is
aligned with the machine axes, is moved to a certain position relative
to the tool and the display is set either to zero or to another appropriate
value (e.g., to compensate the tool radius).
Example:
Drawing with several relative datums (ISO 129 or DIN 406 Part 11,
Fig. 171)
Fig. I.3 The workpiece datum represents the origin
of the Cartesian coordinate system
I – 1 Fundamentals of Positioning
POSITIP 880 13
Example: Coordinates of hole 1:
X =10 mm
Y = 5 mm
Z = 0 mm (hole depth: Z = – 5 mm)
The datum of the Cartesian coordinate system is located 10 mm from
hole 1 in the X axis and 5 mm from it in the Y axis. See Fig. I.4.
The KT Edge Finder from HEIDENHAIN, together with the
POSITIP 880's edge finding functions, facilitates finding and setting
datums.
Nominal Position, Actual Position and DistanceTo-Go
The position that the tool is to move to is called the nominal position
I – 1 Fundamentals of Positioning
while the position of the tool at any given moment is called the actual
position. The distance from the nominal position to the actual position
is called the distance-to-go. See Fig. I.5.
Sign for distance-to-go
The distance-to go has a positive sign if the axis direction from the
actual towards the nominal position is negative.
The distance-to-go has a negative sign if the axis direction from the
actual towards the nominal position is positive.
Fig. I.4 Hole 1
Fig. I.5 Nominal position S, actual position I and
defines the coordinatesystem
distance-to-go R
14 I Operating Instructions
Absolute Workpiece Positions
Each position on the workpiece is uniquely identified by its absolute
coordinates. See Fig. I.6.
Example: Absolute coordinates of position 1:
X = 20 mm
Y = 10 mm
Z = 15 mm
If you are drilling or milling a workpiece according to a workpiece
drawing with absolute coordinates, you are moving the tool to the
value of the coordinates.
Fig. I.6 Position 1 definition through absolute
coordinates
Incremental Workpiece Positions
A position can also be referenced to the preceding nominal position.
In this case the relative datum is always the last nominal position.
Such coordinates are referred to as incremental coordinates
(increment = increase). They are also called incremental or chain
dimensions (since the positions are defined as a chain of dimensions).
Incremental coordinates are designated with the prefix I.
Example: Incremental coordinates of position 3 referenced to position
2. See Fig. I.7
Absolute coordinates of position 2:
X = 10 mm
Y = 5 mm
Z = 20 mm
Incremental coordinates of position 3:
IX = 10 mm
IY = 10 mm
IZ = –15 mm
If you are drilling or milling a workpiece according to a drawing with
incremental coordinates, you are moving the tool by the value of the
coordinates.
I – 1 Fundamentals of Positioning
Fig. I.7 Positions 2 and 3 through incremental
coordinates
POSITIP 880 15
A coordinate list corresponding to this example is useful when
working in the operating mode: PROGRAMMING. See Fig. I.8
Fig. I.8 Workpiece drawing with coordinate
dimensioning (ISO 129 or DIN 406 Part 11,
Fig. 179)
Coordinateorigin Dimensions in mm
I – 1 Fundamentals of Positioning
1100 1 1.1 325 320 ø 120 H7
1 1.2 900 320 ø 120 H7
1 1.3 950 750 ø 200 H7
1 2 450 750 ø 200 H7
1 3 700 1225 ø 400 H8
2 2.1 -300 150 ø 50 H11
2 2.2 -300 0 ø 50 H11
2 2.3 -300 -150 ø 50 H11
3 3.1 250 0° ø 26
3 3.2 250 30° ø 26
3 3.3 250 60° ø 26
3 3.4 250 90° ø 26
3 3.5 250 120° ø 26
3 3.6 250 150° ø 26
3 3.7 250 180° ø 26
3 3.8 250 210° ø 26
3 3.9 250 240° ø 26
3 3.10 250 270° ø 26
3 3.11 250 300° ø 26
3 3.12 250 330° ø 26
Pos. X1 X2 Y1 Y2 r f d
Coordinates
16 I Operating Instructions
Position Encoders
The position feedback encoders convert the movement of the
machine axes into electrical signals. The POSITIP 880 constantly
evaluates these signals and calculates the actual positions of the
machine axes, which it displays as a numerical value on the screen.
See Fig. I.9.
If there is an interruption in power, the calculated position will no
longer correspond to the actual position. When power is restored, you
can re-establish this relationship with the aid of the reference marks
on the position encoders and the POSITIP 880's reference mark
evaluation feature (REF).
Reference Marks
The scales of the position encoders contain one or more reference
marks. When reference marks are crossed they can be used to define
an absolute position in an incremental system. If power is interrupted
this absolute position is lost and the relationship between the
reference mark and scale position is lost. The reference marks on the
position encoders and the POSITIP 880's reference mark evaluation
feature allows the unit to quickly re-establish this relationship again
when power is restored. See Fig. I.10.
When a reference mark is crossed over, it generates a signal which
identifies that position as the reference point. The POSITIP 880 uses
this reference point to restore the relationship between the scale
position and the display value which was last defined by setting the
datum.
If the position encoders feature distance-coded reference marks,
there are reference marks uniquely spaced along the length of the
scale. Crossing any two reference marks will restore the datum. Each
axis need only move a limited distance for linear encoders, and angle
for rotary encoders.
The datum setting cannot be restored from one power
cycle to the next if the reference marks were not crossed
before the datum was set.
Fig. I.9 Linear position encoder, here for the X axis
I – 1 Fundamentals of Positioning
Fig. I.10 Linear scales: with distance-coded
reference marks (upper illustration) and one
reference mark (lower illustration)
POSITIP 880 17
Angle Reference Axis
For angular positions, the following reference axes are defined:
Plane Angle reference axis
XY +X
YZ +Y
ZX +Z
Positive direction of rotation is counterclockwise if the working plane
is viewed in negative tool axis direction. See Fig. I.11.
Example: Angle in the working plane X / Y
Angle Corresponds to the...
+ 45° ... bisecting line between +X and +Y
+/– 180° ... negative X axis
- 270° ... positive Y axis
I – 1 Fundamentals of Positioning
Fig. I.11 Angle and the angle reference axis, e.g. in
the X / Y plane
18 I Operating Instructions
I – 2 Working with POSITIP 880 –
First Steps
Power Up
Switch on the power (located on the back). It will take
approximately 25 - 30 seconds for system to start
after power up. The initial screen will appear (This
screen will only appear the first time you power
up). Select the language by pressing the LANGUAGE
soft key.
At this point you have the choice of MILL or TURN.
Select the MILL soft key to proceed with milling
functions the first time you power up. See Table of
Contents for turning functions section. See Fig. I.12.
You can change the application later in
INSTALLATION SETUP under COUNTER SETTINGS.
Your POSITIP 880 is now ready for operation and is in the operating
mode ACTUAL VALUE. Axis will show “NO REF”.
Before You Start
The POSITIP 880's reference mark evaluation feature automatically reestablishes the relationship between axis slide positions and display
values that you last defined by setting the datum.
If the axis encoder has reference marks, the NO REF indicator will
flash. See Fig. I.13. After crossing over the reference marks, the
indicator will stop flashing and change to REF.
Working without reference mark evaluation
You can also use the POSITIP 880 without crossing over the reference
marks. Press the NO REF soft key to exit the reference mark evaluation
routine and continue in ACTUAL VALUE mode. The NO REF indicator
will indicate that reference marks were not crossed over for that axis.
You can still cross over reference marks at a later time. The ENABLE
REF soft key will be available from ACTUAL VALUE mode. Press this
soft key to activate the reference mark evaluation routine.
Fig. I.12 Initial screen
I – 2 Working with POSITIP 880 – First Steps
Fig. I.13 Display before choosing NO REF
POSITIP 880 19
ENABLE REF function
The purpose of the ENABLE REF function, is to give the operator the
opportunity to either ignore the reference marks as they are crossed
over by disabling it, or finding reference marks when necessary by
enabling it. When the ENABLE REF soft key is pressed, the POSITIP 880
is ready to identify a reference mark. When the ENABLE REF soft key is
not depressed, POSITIP 880 will ignore all reference marks. When all
reference marks have been found, the ENABLE REF soft key will
disappear.
If an encoder is setup without reference marks, then the
REF indicator will not be displayed.
Once reference marks for all desired axes are established, press NO
REF soft key to cancel out of routine. You do not have to cross over the
reference marks of all the encoders, only those that you need.
If you do not cross over the reference marks, POSITIP 880
does not store the datum points. This means that it is not
possible to re-establish the relationship between axis slide
positions and display values after a power interruption
(switch-off).
Turn on power and press any key.
Cross over the reference marks (in any order).
Do not cross over the reference marks. Note: In this
I – 2 Working with POSITIP 880 – First Steps
20 I Operating Instructions
case the relationship between axis slide position and
display value will be lost after a power interruption.
Press the NO REF soft key.
Operating Modes
Selecting the operating mode determines which functions are
available to you.
Available functions Mode Key
Position display for workpiece
machining; Zero reset; Datum
setting – also with edge finder probe
ACTUAL VALUE
Distance-to-go display; hole
patterns; milling and drilling with tool
radius compensation
Storage of work steps for small-lot
production
Run programs previously created in
the PROGRAMMING mode
You can switch to another operating mode at any time by pressing the
key for the desired mode.
In the following examples requiring tool usage, refer to chapter I-8
under Job Setup.
DISTANCE-TO-GO
PROGRAMMING
EXECUTE PROGRAM
I – 2 Working with POSITIP 880 – First Steps
POSITIP 880 21
On-Screen Operating Instructions (HELP Mode)
The integrated operating instructions provide information and
assistance in any situation. See Fig. I.14 & Fig. I.15.
To call the operating instructions:
8 Press the INFO soft key.
8 Press the HELP soft key.
8 Information relevant to the current operation will be displayed.
8 Use the paging soft keys if the explanation is spread over more than
one screen page.
To view information on another topic:
8 Press the LIST OF TOPICS soft key.
8 Press the paging soft keys to scroll through the index.
8 Press the VIEW TOPIC soft key to select the item you need.
To leave the operating instructions:
8 Press the EXIT HELP soft key.
Example: On-screen operating instructions for datum setting
with the edge finder (CENTER LINE)
The CENTER LINE function is described in this manual on page 20.
8 From the ACTUAL VALUE mode, press the PROBE soft key.
8 Press the INFO soft key.
8 Press the HELP soft key.
8 To leave the operating instructions: Press the EXIT HELP soft key.
The screen returns to the screen with the SET DATUM form and
I – 2 Working with POSITIP 880 – First Steps
DRO display.
Fig. I.14 Index under HELP mode
Fig. I.15 On-screen operating instructions for datum
setting
Confirming Your Changes
You must confirm your changes by pressing the ENT key for them to
become effective. The instruction sections of this manual will
occasionally give the command “Confirm your changes.” This means
press the ENT key.
22 I Operating Instructions
Messages
The Message bar messages will change color depending on the type
of information it is conveying: Normal messages will appear as gray
boxes with black text. Instructional messages will appear as blue
boxes with white text. Error messages will appear as red boxes with
white text.
Error messages
If an error occurs while you are working with POSITIP 880, the
Message bar will turn red and provide an explanation of what caused
the error.
To clear the error message:
8 Press the CE (Clear Entry) key.
Critical error messages
Critical error messages mean that the operational
reliability of the POSITIP 880 has been impaired.
If a critical error occurs, a message box will appear in the middle of the
screen:
8 Take note of the error message displayed on the screen.
8 Switch off the power to the POSITIP 880.
8 Attempt to correct the problem with the power off.
8 If the critical error message recurs, notify your customer service
agency.
I – 2 Working with POSITIP 880 – First Steps
POSITIP 880 23
Selecting the Unit of Measure
Positions can be displayed and entered in millimeters or inches. If you
choose inches, INCH will be displayed on the status bar at the top of
the screen. See Fig. I.16.
To change the unit of measure:
8 Press the INFO soft key.
8 Press the INCH/MM soft key.
8 The unit of measure can also be set in JOB SETUP. Refer to Job
Setup, chapter I-8.
Selecting the Angle Format
Angles – such as for a rotary table – can be displayed and entered
either as decimal degrees, degrees/minutes/seconds (DMS) or radian
values. Refer to Job Setup, chapter I-8 for instructions on setting angle
format.
Fig. I.16 The MM indicator
Tool Table
The POSITIP 880’s tool table provides a convenient way to store
I – 2 Working with POSITIP 880 – First Steps
diameter and length offset information for each of the tools you
commonly use. You can enter up to 99 tools.
Before you start workpiece machining, select the tool you are using
from the tool table. POSITIP 880 will then take into account the
entered diameter and length of the tool.
The tool length is the difference in length ΔL between the tool and the
reference tool. The reference tool is indicated by T1 in Fig. I.17.
Sign for the length difference ΔL
If the tool is longer than the reference tool: ΔL > 0 (+)
If the tool is shorter than the reference tool: ΔL < 0 (–)
Refer to Job Setup for entering a tool into the tool table.
Fig. I.17 Tool length and diameter
24 I Operating Instructions
Calling the Tool Data
The lengths and diameters of your tools must first be entered into the
POSITIP 880's tool table.
Before you start machining, select the tool you are using from the tool
table. POSITIP 880 then takes into account the stored tool data when
you work with tool compensation (e.g., with hole patterns).
You can also call the tool data with the command TOOL
CALL in a program.
Tool call
Press the INFO soft key.
Then the JOB SETUP soft key. (Tool table is high-
lighted).
Press ENT.
TOOL NUMBER
Cursor to the tool you want or enter the tool number
directly.
Press USE, then USE NEW SETTINGS.
View status bar to verify the proper tool has been
called.
I – 2 Working with POSITIP 880 – First Steps
POSITIP 880 25
I – 3 Actual Value
Datum Setting: Approaching Positions and Entering Actual Values
The easiest way to set datum points is to use the POSITIP 880's
probing functions – regardless of whether you probe the workpiece
with the HEIDENHAIN KT Edge Finder or with a tool. Description of
the probing functions: See "Probing Functions for Datum Setting" on
page 28
I – 3 Actual Value
Of course, you can also set datum points in the conventional manner
by touching the edges of the workpiece one after the other with the
tool and entering the tool positions as datum points (see examples
following this page).
The datum table can hold up to 99 datum points. In most cases this
will free you from having to calculate the axis travel when working
with complicated workpiece drawings containing several datums.
Datum settings are performed in the ACTUAL VALUE operating mode
and define the relationships between the axis positions and the
display values. If necessary, the datum table’s values may be changed
by entering a value directly.
See Job Setup for setting the datum value directly.
Datum selection (Mill only)
In ACTUAL VALUE mode, the Up/Down arrow keys may be used to
select the next or previous datum number.
Tool selection (Turn only)
In ACTUAL VALUE mode, the Up/Down arrow keys may be used to
select the next or previous tool number.
26 I Operating Instructions
Example: Setting a workpiece datum without the probing
function. See Fig. I.18 & Fig. I.19.
Working plane: XY
Tool axis: Z
Tool diameter: D = 3 mm
Axis sequence in this example: X - Y - Z
Preparation: Calling the tool data
Select the tool data for the tool which you are using to touch the
workpiece.
Preparation: Select the datum
Operating mode: ACTUAL VALUE
From ACTUAL VALUE mode, press the DATUM soft
key.
Cursor will be in the DATUM NUMBER field.
Enter the datum number and press ENT.
Touch the workpiece at edge 1.
I – 3 Actual Value
Fig. I.18 SET DATUM form
Select the X axis key.
DATUM SETTING X
Enter the position of the tool center (X = – 1.5 mm)
and
transfer the X-coordinate of the datum and press ENT.
Touch the workpiece at edge 2.
Select the Y axis key.
POSITIP 880 27
Fig. I.19
DATUM SETTING Y
Enter the position of the tool center (Y = – 1.5 mm)
and
transfer the Y-coordinate of the datum and press ENT.
Touch the workpiece surface.
I – 3 Actual Value
Select the Z axis key.
DATUM SETTING Z = + 0
Enter the position of the tool tip (Z = 0 mm) and
transfer the Z-coordinate of the datum. Press USE.
Probing Functions for Datum Setting
It is particularly easy with a HEIDENHAIN KT 130 Edge Finder (Fig.
I.20).
During probe functions, the display freezes with the
location of the edge, centerline, or circle center.
The following probing soft key functions are available:
Workpiece edge as datum: EDGE
Centerline between two workpiece edges: CENTER LINE
Center of a hole or cylinder: CIRCLE CENTER
With Circle Center, the hole must be in a main plane. The three main
planes are formed by the axes X / Y, Y / Z and Z / X.
The POSITIP 880's probing functions enable you to set datum points
with a HEIDENHAIN KT Edge Finder. The probing functions are also
available when you are using a tool instead of an edge finder.
Fig. I.20 The HEIDENHAIN KT 130 Edge Finder
28 I Operating Instructions
Datum setting with the edge finder
Preparation: Enter the stylus diameter and select the datum
8 Press the INFO soft key.
8 Press JOB SETUP, then cursor to EDGE FINDER and press ENT.
8 Enter the diameter of the edge finder stylus and confirm with ENT.
8 Enter the desired length and confirm with ENT.
8 Enter the desired unit of measurement (inch/mm).
8 Press USE, then USE NEW SETTINGS.
In all probing functions, POSITIP 880 takes into account the entered
stylus diameter.
To abort the probing function
While the probing function is active, POSITIP 880 displays the CANCEL
soft key. Choose this soft key to return to the opening state of the
selected probing function.
I – 3 Actual Value
POSITIP 880 29
Example: Probe workpiece edges, and set the corner as a datum.
See Fig. I.21 & Fig. I.22.
Datum axis: X = 0 mm
Y = 0 mm
The coordinates of the datum can be set by probing edges or surfaces
and capturing them as datums as described on the next page.
Operating mode: ACTUAL VALUE
Press the PROBE soft key.
I – 3 Actual Value
Cursor to axis.
Press EDGE soft key.
PROBE IN X AXIS
Move the edge finder toward the workpiece until the
LEDs on the edge finder light up.
Retract the edge finder from the workpiece.
ENTER VALUE FOR X + 0
0 is offered as a default value for the coordinate. Enter
the desired coordinate for the workpiece edge, for
example X = 0 mm and
set the coordinate as a datum for this workpiece
edge. Press ENT.
Press EDGE soft key.
PROBE IN Y AXIS
Move the edge finder toward the workpiece until the
LEDs on the edge finder light up.
Fig. I.21 Form for setting datum using an edge
Fig. I.22
Retract the edge finder from the workpiece.
30 I Operating Instructions
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