HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 288)

Cycles: Special Functions
12.5 TOLERANCE (Cycle 32, DIN/ISO: G62)
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TNC 640 | User's Manual Cycle Programming | 3/2014
Please note while programming:
With very small tolerance values the machine cannot
cut the contour without jerking. These jerking
movements are not caused by poor processing
power in the TNC, but by the fact that, in order to
machine the contour element transitions very exactly,
the TNC might have to drastically reduce the speed.
Cycle 32 is DEF active which means that it becomes
effective as soon as it is defined in the part program.
The TNC resets Cycle 32 if you
Redefine it and confirm the dialog question for
the
tolerance value with NO ENT.
Select a new program with the
PGM MGT key.
After you have reset Cycle 32, the TNC reactivates
the tolerance that was predefined by machine
parameter.
In a program with millimeters set as unit of measure,
the TNC interprets the entered tolerance value in
millimeters. In an inch program it interprets it as
inches.
If you transfer a program with Cycle 32 that contains
only the cycle parameter
Tolerance value T, the TNC
inserts the two remaining parameters with the value
0 if required.
As the tolerance value increases, the diameter of
circular movements usually decreases. If HSC filters
are active on your machine (settings made by the
machine tool builder), the circle can also become
larger.
If Cycle 32 is active, the TNC shows the parameters
defined for Cycle 32 on the
CYC tab of the additional
status display.