HEIDENHAIN PT 855 for Turning - Manual (Page 22)

I - 2 Working with POSITIP – First Steps
POSITIP 855 Operating Instructions 23
Entering oversizes
➤ ➤ ➤ ➤ ➤ Press MOD.
➤
➤ ➤ ➤ ➤ Scroll to the user parameter Oversize .
➤ ➤ ➤ ➤ ➤ Press the soft key Oversize X (for example).
➤ ➤ ➤ ➤ ➤ Enter the desired oversize for the axis (including the sign).
➤
➤ ➤ ➤ ➤ Press ENT.
This returns you to the main menu for the user parameters.
➤ ➤ ➤ ➤ ➤ If desired, enter an oversize for the second axis.
➤
➤ ➤ ➤ ➤ Switch the soft key
Ovrsize ON / OFF to ON .
This activates the oversizes you entered.
➤ ➤ ➤ ➤ ➤ Leave the user parameters:
Press MOD.
The entered oversizes will now be taken into account when you
traverse to display value zero with the distance-to-go display.
To deactivate oversizes
When you want to work without oversizes again:
➤
➤ ➤ ➤ ➤ Switch the soft key Ovrsize ON / OFF to
OFF , or enter 0 for the oversize.
Example: Effect of an oversize in the X axis
1. Diameter display for X, position
Position of the tool cutting edge:
without oversize: X ∅ = +40.000 mm
with oversize (+2.000 mm): X ∅ = +44.000 mm
with undersize (–2.000 mm): X ∅ = +36.000 mm
2. Radius display for X, position
Position of the tool cutting edge:
without oversize: X = +50.000 mm
with oversize (+2.000 mm): X = +52.000 mm
with undersize (–2.000 mm): X = +48.000 mm
C A U T I O N
When the soft key
Ovrsize ON / OFF is set to ON
oversizes will be effective on every position which you
move to with
DISTANCE-TO-GO .
1
2
Z
X
100 40
Displaying and moving to positions
Fig. 21: Workpiece drawing for the example on
Oversizes. Tool positions without over-
size or undersize
Fig. 20: Entering an oversize
MOD
2
1