Machsupport Forum
G-Code, CAD, and CAM => G-Code, CAD, and CAM discussions => Topic started by: Rimmel on March 11, 2014, 03:33:33 PM
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Got a problem with G76
G0 G90 Z5 X9.84
G76 X8.95 Z-21 Q2 P0.75 J0.03 L45 H0.05 I29 C0.3 B0.01 T0
G80
This code works 90% of the time but then will suddenly stick on 0.75 feed, whereas when it runs properly it goes to 0.75 feed when at the point of starting the thread and then changes to 600 feed when cutting the thread.
thanks
Rim
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G76 did not worked because of rapid infeed at crazy rates, for example, in metric threads at 1000RPM and pitch 1.5mm machine started operating at F1.5/rev ignoring Mach3 Motor Tuning settings and tried to do rapid feed on X axis in very small distances at 1500mm/min momentary which causes missing steps for steppers and PID error for Servo systems. We have found that on Mach3 Turn G76 doesn't work well ignoring acceleration settings comparing to G32.
On our new screenset, we have fixed this issue by using G32.
http://www.machsupport.com/forum/index.php/topic,33852.msg234743.html#msg234743
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Have not used G76 for threading in a long time, but back in time it worked fine for me.
Could it be Mach version related?
BTW,
Preference here is to have the threading macro set for G32 code generation since it has never given me a problem.
RICH
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Preference here is to have the threading macro set for G32 code generation since it has never given me a problem.
RICH
How do you set that it to G32?
thanks
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Rimmel,
See page 47 in my write up called "Threading On The Lathe - Mach3 Turn".
Should be in Members Docs.
RICH
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Wow, I thought I was going crazy with G76.
Thanks for the info