HEIDENHAIN PT 855 User Manual
December 2002
User's Manual
POSITIP 855
for Milling
Screen
Plain language
dialog line
Input line
Distance-to-go
display
Feed rate
Operating
mode or
function
Symbols
Behind the position display:
: Scaling factor or oversize active
Æ: Diameter display
Reference marks
have been
crossed over
Operating mode
symbols (current
mode is highlighted)
Symbol for
soft-key row
Soft-key row
(with 5 soft
keys)
Soft keys
Datum
Tool number
and tool axis
Keyboard
Change parameters
and settings
5 soft keys
(functions vary accord-
ing to associated fields
on screen)
Clear entries or
error messages
Page through
individual screens
Access program blocks to
make changes, or switch
operating parameters
MOD
7
4
1
0
CE
INFO
8
5
2
HELP
9
6
3
ENT
GOTO
Select or deselect
INFO functions
Select or deselect HELP
screens
Numeric input keys
Change sign
Confirm entry
Incremental
dimensions
Return to previous
soft-key row
Go to program block or
operating parameter
Select operating mode
Switch datum;
select entry fields
Software version
This User's Manual is for POSITIP models with the following software version:
The x's can be any numbers. The software version of your unit is
shown on a label on the rear panel.
This User's Manual covers the functions of the
POSITIP 855 for milling applications. For turning
applications, a separate manual is available.
Location for use
This unit corresponds to class A in accordance with EN 55 022 and
will be used predominantly in industrially zoned areas
About this manual
This manual is divided into two parts:
Part I: Operating Instructions ... starts on page 5
Part II: Technical Information ..... starts on page 81
246 xxx-05.
Operating Instructions
When using the POSITIP in your work, you need only refer to the
Operating Instructions (Part I).
If you're new to POSITIP, 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, you can use the operating
instructions as a comprehensive review and reference guide. The
clear layout and the subject index make it easy to find the desired
topics.
Technical Information
If you are interfacing POSITIP to a machine or wish to use the data
interfaces, refer to the technical information in Part II.
Subject Index
A subject index for both parts of the manual can be found on
pages 113 to 115.
POSITIP 855 Operating Instructions
Dialog flowcharts
Dialog flowcharts are used for each example in this manual.
They are laid out as follows:
This area shows the
keys to press.
This area explains the key function or work step.
If necessary, supplementary information will also be included.
Prompt
This area shows the
keys to press.
A prompt appears with some actions (not always) at the top of
the screen. In the flowcharts the prompts always have a gray
background.
If two flowcharts are divided by a broken line, this means that you
can follow the instructions either above or below the broken line.
Some flowcharts also show the screen that will appear after you
press the correct keys.
Abbreviated flowcharts
Abbreviated flowcharts supplement the examples and explanations. An arrow ( ➤ ) indicates a new input or a work step.
This area explains the key function or work step.
If necessary, supplementary information will also be included.
If there is an arrow at the end of the flowchart, this means that it continues on
the next page.
Important Notes in this Manual
The surfaces marked gray 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.
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 behaviour of the POSITIP.
Important Information,
e.g. when a special tool is required for a function.
Electric Shock Warning,
e.g. when opening a housing.
Operating Instructions POSITIP 855
Part I: Operating Instructions
I - 1 Fundamentals of Positioning ......................................................7
I - 2 Working with POSITIP First Steps .........................................13
Before you start ................................................................................................ 13
Switch-on ......................................................................................................... 13
Operating modes .............................................................................................. 14
The HELP, MOD and INFO functions ................................................................ 14
Selecting soft-key functions .............................................................................. 15
On-screen operating instructions....................................................................... 16
Error messages ................................................................................................ 17
Selecting the unit of measurement ................................................................... 17
Selecting the angle format ................................................................................ 17
Entering tool length and diameter...................................................................... 18
Calling the tool data .......................................................................................... 19
Datum setting: Approaching positions and entering actual values ..................... 20
Probing functions for datum setting................................................................... 22
Displaying and moving to positions ................................................................... 29
I - 3 Hole Patterns and Rectangular Pocket ....................................35
Bolt hole circle patterns .................................................................................... 35
Linear hole patterns .......................................................................................... 39
Milling a rectangular pocket .............................................................................. 43
I
I - 4 Programming POSITIP ..............................................................45
PROGRAMMING AND EDITING operating mode .............................................. 45
Program number ............................................................................................... 46
Deleting programs ............................................................................................. 46
Editing programs ............................................................................................... 47
Entering program blocks ................................................................................... 48
Calling the tool data in a program...................................................................... 50
Calling datum points ......................................................................................... 50
Transferring positions: Teach-In mode .............................................................. 51
Hole patterns in programs ................................................................................. 56
Rectangular pocket milling in programs ............................................................ 60
Entering program interruptions .......................................................................... 63
Subprograms and program section repeats ....................................................... 64
Editing program blocks ..................................................................................... 69
Deleting program blocks ................................................................................... 70
Transferring programs over the data interface ................................................... 71
I - 5 Executing Programs ..................................................................73
I - 6 The INFO Functions:
Pocket Calculator, Stopwatch and Cutting Data Calculator ..75
To access the INFO functions ........................................................................... 75
Cutting data: Calculate spindle speed S and feed rate F.................................... 76
Stopwatch ........................................................................................................ 77
Pocket calculator functions ............................................................................... 77
I - 7 User Parameters: The MOD Function ......................................79
Scaling factors .................................................................................................. 79
Entering user parameters .................................................................................. 80
Part II: Technical Information............................................................ 81
Subject Index....................................................................................113
Operating Instructions
I - 1 Fundamentals of Positioning
0° 90°90°
0°
30°
30°
60°
60°
Greenwich
+X
+Y
+Z
+X
+Z
+Y
Fundamentals of Positioning
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-to-go.
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. The term coordinate comes from the Latin word for "that
which is arranged." 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.
On a milling machine equipped with a position display unit, 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 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. 1: The geographic coordinate system is an
absolute reference system
Fig. 2: Designations and directions of the axes
on a milling machine
POSITIP 855 Operating Instructions 7
I - 1 Fundamentals of Positioning
Y
X
Z
Fundamentals of Positioning
Setting the datum
The workpiece drawing 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)
125
250
216,5
-250
-125
-216,5
0
Fig. 3: The workpiece datum represents the
origin of the Cartesian coordinate
system
250
-250
Z
1225
150
0
0
-150
300±0,1
325
0
450
700
1
750
320
0
Example: Coordinates of hole :
X = 10 mm
900
216,5
125
0
-125
-216,5
950
Y = 5 mm
Z = 0 mm (hole depth: Z = 5 mm)
The datum of the Cartesian coordinate system
is located 10 mm from hole in the X axis and
1
Y
5 mm from it in the Y axis (in negative direction).
The KT Edge Finder from HEIDENHAIN, together with the
POSITIP'S edge finding functions, facilitates finding and setting
1
X
datums.
5
10
Fig. 4: Hole defines the coordinate system
1
8 Operating Instructions POSITIP 855
I - 1 Fundamentals of Positioning
Y
X
Z
I
S
R
Y
X
Z
1
20
10
Z=15mm
X=20mm
Y=10mm
15
IZ=–15mm
Y
X
Z
2
10
5
5
15
20
10
10
I
X=10mm
I
Y=10mm
3
0
0
R
Fundamentals of Positioning
Nominal position, actual position and distance-to-go
The position that the tool is to move to is called the nominal posi-
tion, 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.
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. 5: Nominal position , actual position
and distance-to-go
S
I
Absolute workpiece positions
Each position on the workpiece is uniquely identified by its absolute
coordinates.
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.
Incremental workpiece positions
A position can also be referenced to the preceding nominal position. In this case the relative datum is always the last programmed
position. Such coordinates are referred to as incremental coordi-
nates (increment = increase). They are also called incremental or
chain dimensions (since the positions are defined as a chain of di-
Fig. 6: Position definition through absolute
coordinates
mensions). Incremental coordinates are designated with the
prefix
I.
Example: Incremental coordinates of position referenced to
position
2
Absolute coordinates of position :
3
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.
POSITIP 855 Operating Instructions 9
An incremental position definition is therefore a specifically relative
definition. Likewise, a position defined by the distance-to-go to
the nominal position is also a relative position (in this case the relative datum is in the nominal position).
Fig. 7: Position definition through incremental
coordinates
I - 1 Fundamentals of Positioning
Fundamentals of Positioning
Example: Workpiece drawing with coordinate dimensioning (ISO 129 or DIN 406 part 11, fig. 179)
3.4
3
3.10
Y2
X2
3.3
3.2
r
3.1
3.12
3.11
1.21.1
ϕ
Y1
3.5
3.6
3.7
3.8
2.1
2.2
2.3
1
3.9
2 1.3
X1
A coordinate list corresponding to this example is useful when
working in the PROGRAMMING AND EDITING operating mode.
Dimensions in mm
Coordinates
Coordinate
origin
Pos. X1 X2 Y1 Y2 r j d
1100
1 1.1 325 320 Æ 120 H7
1 1.2 900 320 Æ 120 H7
1 1.3 950 750 Æ 200 H7
1 2 450 750 Æ 200 H7
1 3 700 1225 Æ 400 H8
2 2.1 300 150 Æ 50 H11
2 2.2 300 0 Æ 50 H11
2 2.3 300 150 Æ 50 H11
3 3.1 250 0° Æ 26
3 3.2 250 30° Æ 26
3 3.3 250 60° Æ 26
3 3.4 250 90° Æ 26
3 3.5 250 120° Æ 26
3 3.6 250 150° Æ 26
3 3.7 250 180° Æ 26
3 3.8 250 210° Æ 26
3 3.9 250 240° Æ 26
3 3.10 250 270° Æ 26
3 3.11 250 300° Æ 26
3 3.12 250 330° Æ 26
10 Operating Instructions POSITIP 855
I - 1 Fundamentals of Positioning
Y
X
Z
Y
X
+45°
+180°
–180°
–270°
Fundamentals of Positioning
Position feedback
The position feedback encoders convert the movement of the machine axes into electrical signals. The POSITIP constantly evaluates
these signals and calculates the actual positions of the machine
axes, which it displays as a numerical value on the screen.
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's reference mark
evaluation feature (REF).
Reference marks
The scales of the position encoders contain one or more reference
marks. When a reference mark is passed over, it generates a signal
which identifies that position as the reference point (scale reference
point = machine reference point). With the aid of this reference
mark the POSITIP's REF feature re-establishes the assignment of
displayed positions to machine axis positions which you last defined by setting the datum.
Fig. 8: Linear position encoder, here for the X
axis
Angle reference axis
If the position encoders feature distance-coded reference marks,
each axis needs only move a maximum of 20 mm (0.8 in.) for linear
encoders, and 20° for angle encoders.
For angular positions, the following reference axes are defined:
Plane Angle reference axis
X Y +X
Y Z +Y
Z X +Z
Positive direction of rotation is counterclockwise if the working
plane is viewed in negative tool axis direction (see fig. 10).
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
Fig. 9: Linear scales: with distance-coded ref-
erence marks (upper illustration) and
one reference mark (lower illustration)
Fig. 10: Angle and the angle reference axis, e.g.
in the X / Y plane
POSITIP 855 Operating Instructions 11
I - 1 Fundamentals of Positioning
Fundamentals of Positioning
NOTES
12 Operating Instructions POSITIP 855
I - 2 Working with POSITIP First Steps
I-2
Working with POSITIP First Steps
Before you start
You can cross over the reference marks after every switch-on.
The POSITIP's reference mark evaluation feature (REF) automati-
cally re-establishes the relationship between axis slide positions
and display values that you last defined by setting the datum.
When you have crossed over all the reference marks, the REF
indicator appears in the input line at the top of the screen.
Setting new datum points automatically stores the new relationship between axis positions and display values.
Working without reference mark evaluation
You can also use the POSITIP without crossing over the reference
marks simply press the soft key No REF.
Note that if you do not cross over the reference marks,
POSITIP 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).
Fig. 11: REF display on screen
Switch-on
Your POSITIP is now ready for operation and is in the ACTUAL VALUE operating mode.
0
ä
1
Switch on the power
and
press any key.
Cross over the reference marks in all axes
(in any order).
Do not cross over the reference marks.
Note: In this case the relationship between axis slide positions and
display values will be lost after a power interruption.
POSITIP 855 Operating Instructions 13
I - 2 Working with POSITIP First Steps
Operating modes
Selecting the operating mode determines which functions are available to you.
Available functions Mode Key
Position display for ACTUAL VALUE
workpiece machining;
Zero reset;
Datum setting
also with edge finder
Distance-to-go display; hole DISTANCE-
patterns; rectangular pocket; TO-GO
drilling and milling with tool radius compensation
Storage of work steps for PROGRAMMING
small-lot production AND EDITING
Run programs previously EXECUTE
created in the PROGRAMMING PROGRAM
AND EDITING mode
You can switch to another operating mode at any time by
pressing the key for the desired mode.
The HELP, MOD and INFO functions
You can call the HELP, MOD and INFO functions at any time.
To call a function:
ä
Press the function key for that function.
To leave the function:
ä
Press the same function key again.
Available functions Mode Key
On-screen operating HELP
instructions: graphics and
text keyed to the current
screen contents
User parameters: MOD
To redefine POSITIP's basic
operating characteristics
HELP
MOD
Cutting data calculator, INFO
stopwatch, pocket calculator
INFO
14 Operating Instructions POSITIP 855
I - 2 Working with POSITIP First Steps
Selecting soft-key functions
The soft-key functions are grouped into one or more rows.
POSITIP indicates the number of rows by a symbol at the upper
right of the screen. If no symbol is shown, that means there is only
one row for the function. The highlighted rectangle in the symbol
indicates the current row.
Function Key
Page throught soft-key rows: forwards
Page through soft-key rows: backwards
Go back one level
POSITIP displays the soft keys with the main functions of an operating mode whenever you press the
key for that mode.
Fig. 12: The symbol for soft-key row is at the
top right of the screen. Here, the second row is being displayed.
POSITIP 855 Operating Instructions 15
I - 2 Working with POSITIP First Steps
On-screen operating instructions
The integrated operating instructions provide information and assistance in any situation.
To call the operating instructions:
ä
Press the HELP key.
ä
Use the paging keys if the explanation is spread over more than
one screen page.
To leave the operating instructions:
ä
Press the HELP key again.
Example: On-screen operating instructions for datum setting
with the edge finder (PROBE CIRCLE CENTER)
The PROBE CIRCLE CENTER function is described in this manual
on page 25.
ä
Select the ACTUAL VALUE operating mode.
ä
Press the Probe soft key.
➤ Press the HELP key.
The first page of the operating instructions for the Probe function
appears.
Page reference at the lower right of the screen:
the number in front of the slash is the current page, the number
behind the slash is the total number of pages.
The on-screen operating instructions now contains the following
information on ACTUAL VALUE – PROBE (on three pages):
Overview of the probing functions (page 1)
Graphic illustration of all probing functions
(pages 2 and 3)
Fig. 13: On-screen operating instructions for
PROBE CIRCLE CENTER, page 1
ä
To leave the operating instructions:
Press HELP again.
The screen returns to the selection menu for the probing func-
tions.
ä
Press (for example) the soft key Circle Center.
ä
Press HELP.
The screen now displays operating instructions spread over
five pages on the PROBE CIRCLE CENTER function including:
Overview of all work steps (page 1)
Graphic illustration of the probing sequence (page 2)
Information on how POSITIP reacts and on datum setting
(page 3)
Probing function Circle Center for tools (pages 4 and 5)
ä
To leave the on-screen operating instructions:
Press HELP.
Fig. 14: On-screen operating instructions for
PROBE CIRCLE CENTER, page 2
Fig. 15: On-screen operating instructions for
PROBE CIRCLE CENTER, page 3
16 Operating Instructions POSITIP 855
I - 2 Working with POSITIP First Steps
Error messages
If an error occurs while you are working with POSITIP, a message
will come up on the screen in plain English.
To call an explanation of the error:
ä
Press the HELP key.
To clear the error message:
ä
Press the CE key.
Blinking error messages
W A R N I N G
Blinking error messages mean that the operational
reliability of the POSITIP has been impaired.
If a blinking error message occurs:
ä
Note down the error message displayed on the screen.
ä
Switch off the power to the POSITIP.
ä
Attempt to correct the problem with the power off.
ä
If the blinking error message recurs, notify your customer
service agency.
Selecting the unit of measurement
Positions can be displayed in millimeters or inches. If you choose
inches, inch will be displayed at the top of the screen next to
REF.
To change the unit of measurement:
ä
Press MOD.
ä
Page to the soft key row containing the user parameter
mm or inch.
ä
Choose the soft key mm or inch to change to the other unit.
ä
Press MOD again.
For more information on user parameters, see chapter I - 7.
Selecting the angle format
Angles such as for a rotary table can be displayed either as a
decimal value or in degrees, minutes and seconds.
To change the angle format:
ä
Press MOD.
ä
Go to the soft key row containing the user parameter
Deg/Min/Sec or Degrees decimal.
ä
Choose the soft key Deg/Min/Sec or degrees decimal
to change to the other format.
ä
Press MOD again.
Fig. 16: The inch indicator
For more information on user parameters, see chapter I - 7.
POSITIP 855 Operating Instructions 17
I - 2 Working with POSITIP First Steps
Z
X
∆L3<0
∆L
2
>0
∆L
1
=0
D
1
T
1
T
2
T
3
D
2
D
3
Entering tool length and diameter
Enter the lengths and diameters of your tools in the POSITIP's tool
table. You can enter up to 99 tools.
Before you start machining workpieces, select the tool you are using from the tool table. POSITIP will then take into account the entered diameter and length of the tool.
The tool length is the difference in length DL between the tool and
the zero tool.
Sign for the length difference DL
If the tool is longer than the zero tool: DL > 0
If the tool is shorter than the zero tool: DL < 0
Example: Entering the tool length and diameter into the tool table
Tool number 7
Tool axis Z
Tool diameter D = 8 mm
Fig. 17: Tool length and diameter
Z
T
0
T
7
D
7
MOD
Tool length L = 12 mm
MOD
/
Select the user parameters.
Go to the soft key row which has Tool Table.
Open the tool table.
Tool number ?
ENT
7
Enter the tool number (such as 7) and confirm your entry with ENT.
=0
L
0
X
L7>0
18 Operating Instructions POSITIP 855
Tool diameter ?
ENT
8
Go to the column with Diameter.
Enter the tool diameter (such as 8 mm) and confirm your entry with ENT.
I - 2 Working with POSITIP First Steps
Tool length ?
MOD
2
1
MOD
Calling the tool data
The lengths and diameters of your tools must first be entered into
the POSITIP's tool table (see previous page).
Before you start workpiece machining, select the tool you are using from the tool table. POSITIP 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.
ENT
Enter the tool length (12 mm) and confirm your entry with ENT.
Select the tool axis (Z).
Depart the user parameters.
Calling the tool data
MOD
5
MOD
Select the user parameters.
/
Go to the first soft key row which has Tool Table.
Select the tool table.
Tool number ?
ENT
Enter the tool number (here: 5) and confirm your entry with ENT.
The number of the selected tool appears at the bottom of the screen.
Depart the user parameters.
Fig. 18: The tool table on the POSITIP's screen
POSITIP 855 Operating Instructions 19
I - 2 Working with POSITIP First Steps
Datum setting: Approaching positions and entering actual values
The easiest way to set datum points is to use the POSITIP's probing functions regardless of whether you probe the workpiece with
the HEIDENHAIN KT Edge Finder or with a tool. A description of the
probing functions starts on page 22.
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 on this page and the next).
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.
For each datum point, the datum table contains the positions that
the POSITIP assigned to the reference points on the scales (REF
values) during datum setting. Note that if you change the REF values in the table, this will move the datum point.
Example: Setting a workpiece datum without the probing function
Working plane: X / Y
Tool axis: Z
Tool radius: R = 5 mm
Axis sequence in
this example: X - Y - Z
Preparation: Select the datum
Select the datum with the vertical arrow keys.
POSITIP displays the number of the current datum at the lower right
of the screen.
Preparation: Call the tool data
Call the tool data for the tool which you are using to touch the workpiece (see previous page).
Z
Y
X
1
2
20 Operating Instructions POSITIP 855
I - 2 Working with POSITIP First Steps
Datum setting: Approaching positions and entering actual values
Operating mode: ACTUAL VALUE
Touch edge with the tool.
Select the X axis.
Datum Setting
X = + 0
5
ENT
Enter the position of the tool center (X = 5 mm)
and
transfer the X coordinate of the datum.
Touch the workpiece at edge .
Select the Y axis.
Datum Setting
Y = + 0
1
2
5
ENT
Enter the position of the tool center (Y = 5 mm)
and
transfer the Y coordinate of the datum.
Touch the workpiece surface.
Select the Z axis.
Datum Setting
Z = + 0
0
ENT
Enter the position of the tool tip (Z = 0 mm)
and
transfer the Z coordinate of the datum.
POSITIP 855 Operating Instructions 21
I - 2 Working with POSITIP First Steps
Probing functions for datum setting
The POSITIP'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.
Datum setting with the edge finder
It is particularly easy to set datum points with a HEIDENHAIN
KT Edge Finder. The following probing functions are available:
Workpiece edge as datum:
Edge
Centerline between two workpiece edges:
Centerline
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 HEIDENHAIN KT 120 Edge Finder can only be
used with electrically conductive workpieces.
Preparation: Enter the stylus diameter and select the datum
ä
Press MOD and go to the soft key row containing the soft key
Edge Finder.
ä
Select the user parameter Edge Finder.
ä
Enter the diameter of the edge finder stylus and confirm with
ENT.
ä
Select the user parameter Datum.
ä
Enter the number of the desired datum and confirm with ENT.
ä
Press MOD again.
The number of the selected datum is now shown at the lower
right of the screen.
In all probing functions, POSITIP takes into account the entered
stylus diameter.
For more information on user parameters, see chapter I - 7.
Exiting the probing function
While the probing function is active, POSITIP displays the soft key
Escape. Choose this soft key to return to the opening state of the
selected probing function.
Fig. 19: The HEIDENHAIN KT Edge Finder
22 Operating Instructions POSITIP 855
I - 2 Working with POSITIP First Steps
Y
X
Z
X?
Probing functions for datum setting
Example: Probe workpiece edge, display position of workpiece
edge and set the edge as a datum
The probed edge lies parallel to the Y axis.
The coordinates of the datum can be set by probing edges or sur-
faces and capturing them as datums as described on the next
page.
Operating mode: ACTUAL VALUE
Select Probe.
Select Edge.
Select axis for which the coordinate is to be set: X axis.
Probe in X axis
Move the edge finder towards the workpiece edge until the
LEDs on the edge finder light up.
The position of the edge on the X axis is displayed on the screen.
Retract the edge finder from the workpiece.
Enter value for X
+ 0
2
0
ENT
0 is offered as a default value for the coordinate.
Enter the desired coordinate for the workpiece edge, for example X = 20 mm
and
set the coordinate as a datum for this workpiece edge.
POSITIP 855 Operating Instructions 23
I - 2 Working with POSITIP First Steps
Probing functions for datum setting
Example:Set centerline between two workpiece edges as datum
The position of the centerline is determined by probing the
edges and .
1
2
M
The centerline is parallel to the Y axis.
Desired coordinate
of the centerline: X = 5 mm
Operating mode: ACTUAL VALUE
Select Probe.
Z
Y
2
1
M
X?
X
Select Centerline.
Select the axis for which the coordinate is to be set: X axis.
Probe 1st edge in X
Move the edge finder toward workpiece edge until the LEDs in the
edge finder light up.
Probe 2nd edge in X
Move the edge finder toward workpiece edge until the LEDs in the
edge finder light up. The display is frozen and the distance between the
two edges appears under the selected axis.
Retract the edge finder from the workpiece.
Enter value for X
+ 0
1
2
5
Enter coordinate (X = 5 mm)
and
ENT
transfer coordinate as datum for the centerline.
24 Operating Instructions POSITIP 855
I - 2 Working with POSITIP First Steps
Y
X
0
1
2
3 4
X?
Probing functions for datum setting
Example: Probe the circumference of a hole with an edge finder
and set the center of the hole as a datum
Main plane X / Y
Edge finder axis parallel to the Z axis
X coordinate of the
circle center X = 50 mm
Y coordinate of the
circle center Y = 0 mm
Operating mode: ACTUAL VALUE
Select Probe.
Select Circle Center.
Select plane containing the circle (main plane): Plane X/Y.
Probe 1st point in X/Y
Move edge finder towards first point on the circumference until the LEDs
on the edge finder light up.
Retract edge finder from bore hole wall.
Probe three additional points on the circumference in the same manner.
Further instructions appear on the screen.
Enter center point X
X = 0
0
5
ENT
Enter the first coordinate (X = 50 mm)
and
transfer coordinate as datum for the circle center.
1
POSITIP 855 Operating Instructions 25
Y = 0
ENT
Accept default entry Y = 0 mm.
Enter center point Y
I - 2 Working with POSITIP First Steps
Probing functions for datum setting
Datum setting with a tool
Even if you use a tool to set datum points, you can still use
POSITIP's probing functions described under the section "Datum
setting with the edge finder" (Edge, Centerline and Circle
Center).
Preparation: Enter the tool diameter and select the datum
ä
Press MOD and go to the soft key row containing the
soft key Tool Table.
ä
Select the user parameter Tool Table.
ä
Select the tool you will use to set the datum.
ä
Leave the tool table:
Press MOD again.
ä
Use the vertical arrow keys to select the number of the desired
datum. The number of the selected datum is shown at the lower
right of the screen.
Fig. 20: On-screen operating instructions for
probing with a tool
Example: Set centerline between two probed edges as datum
The centerline is parallel to the Y axis.
Desired coordinate
of the centerline: X = 50 mm
Operating mode: ACTUAL VALUE
Select Probe.
Select Centerline.
Z
Y
2
1
M
X?
X
Select axis for which the coordinate is to be set: X axis.
26 Operating Instructions POSITIP 855
I - 2 Working with POSITIP First Steps
Probing functions for datum setting
Probe 1st edge in X
Touch the first workpiece edge .
Store the position of the edge.
Probe 2nd edge in X
Touch the second workpiece edge .
Store the position of the edge.
POSITIP displays the distance between the two edges.
Retract the tool from the workpiece.
Enter value for X
+ 0
5
0
ENT
Enter coordinate (X = 50 mm)
and
transfer coordinate as datum for the centerline.
1
2
POSITIP 855 Operating Instructions 27
I - 2 Working with POSITIP First Steps
NOTES
28 Operating Instructions POSITIP 855
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