G76 thread cycle keeps cutting at X absolute regardless of nth pass or DOC

newcomer · Dec 16, 2014

Below is my G-code :
G0 X100 Z100 ;
G76 P020260 Q150 R250 ;
G76 X105 W-30 P5000 Q0300 F1;
G28 U0 ;

On the machine it just kept cutting at X105 on all the passes. Help please…

angelw · Dec 16, 2014

newcomer said:
Below is my G-code :
G0 X100 Z100 ;
G76 P020260 Q150 R250 ;
G76 X105 W-30 P5000 Q0300 F1;
G28 U0 ;

On the machine it just kept cutting at X105 on all the passes. Help please…

Hello newcomer,
You haven't specified the form of the thread, but a 1mm lead thread is unlikely to have a thread height of 5mm (P5000). Your X start location of X100 and an X105 in the G76 block indicates that this thread is an internal thread. The control calculates where the Minor Diameter of the thread is by subtracting P5000 x 2 (P, the Thread Height, is a radial value) from X in the G76 block. Accordingly, a Minor Diameter of X95.0 will be the result; 5mm less than your X Start Location. Either fix the P address, or specify a Start Position less than X95.0

Regards,

Bill

newcomer · Sep 24, 2015

Yes you are right and thanks for the help. Apologies for the late reply.

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G76 thread cycle keeps cutting at X absolute regardless of nth pass or DOC

newcomer

Plastic

angelw

Diamond

newcomer

Plastic

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