Tapered thread
The tapered thread is described by:
● End point in the longitudinal and transverse direction (taper contour)
● Thread lead
The taper contour is entered in Cartesian coordinates X, Y, Z in absolute or incremental
dimensions - preferentially in the X and Z direction for machining on turning machines.
Allowance must also be made for the run-in and run-out paths, across which the feed is
accelerated or decelerated.
The specification of the lead depends on the taper angle (angle between the longitudinal axis
and the outside of the taper):
2.9.10.2 Thread cutting with increasing or decreasing lead (G34, G35)
With the commands G34 and G35, the G33 functionality has been extended with the option of
programming a change in the thread pitch at address F. With G34, this results in a linear
increase and with G35 to a linear decrease of the thread pitch. Commands G34 and G35 can
therefore be used for machining self-tapping threads.
Syntax
Cylinder thread with increasing pitch:
G34 Z… K… F...
Cylinder thread with decreasing pitch:
G35 Z… K… F...
Face thread with increasing pitch:
G34 X… I… F...
Face thread with decreasing pitch:
G35 X… I… F...
Fundamentals
2.9 Motion commands
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 227
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