Thread Cutting With Increasing Or Decreasing Lead (G34, G35) - Siemens SINUMERIK 840D sl Programming Manual

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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):

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.

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...

NC programming

Programming Manual, 12/2019, 6FC5398-2EP40-0BA0

Fundamentals

2.9 Motion commands

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Sinumerik 840de sl