Programming instructions

4-28

Motion Blocks NC Programming 17VRS

DOK-MTC200-NC**PRO*V17-ANW1-EN-P

Sequences of Thread-Cutting NC Blocks Using 'G33'

The G33 function can be used to program consecutive chains of thread-

cutting NC-blocks containing different leads. A thread sequence can con-

sist of

•

single- or multiple-thread longitudinal threads,

•

face threads, or

•

taper threads

in any desired order, provided that the lead during each section of the

thread remains constant.

Lead

Longitudinal

1 Thread

2nd Section

1st Section

Fig. 4-36: Longitudinal thread having two sections of thread each with a different

lead

G33 <endpoint [X,Y,Z]> <lead [I,J,K]> <starting angle [P]>

Thread sequences are programmed as consecutive series of thread-cut-

ting NC-blocks. A transition distance is calculated between two thread-

cutting NC-blocks for each axis experiencing a velocity change. The

thread change is performed at the maximum permissible acceleration, so

that transition parabola result.

•

G08 contouring mode (acceleration) must be active during thread-cut-

ting sequences. G06 positioning with minimized lag should be acti-

vated to ensure that the transition parabola between the thread NC-

blocks are as small as possible.

•

There must not be any function programmed between and in the indi-

vidual thread blocks of a thread-cutting sequence that interrupts block

preparation (such as auxiliary functions, computations, etc.).

•

If the single-block operating mode is active, each thread-cutting NC-

block is processed individually. In this case, a new starting distance is

required for each thread-cutting NC-block. Thus, thread-cutting se-

quences are not possible in the single-block operating mode.

All other conditions are the same as in thread cutting.

Syntax