Guest
Show Posts
1
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: January 23, 2016, 09:45:19 PM »
hello,
last night I was going crazy because of very erratic threading. I read a few threads on this forum, and it was Hood that got me thinking correctly. I've got it working today, and want to share. The secret is to have a perfect index pulse. I had faked my spindle speed into being stable by using major debounce in both Mach3 and ESS dialogue boxes. This is only hiding a serious deficiency once you try to cut threads. Hood said"No debounce". My signal wire was picking up so much noise without debounce that my spindle speed was registering in 8 digits with spindle off! I hooked up my cnc4pc spindle pulse unit to the c3 board with the shielded cable and presto - no more bad rpm readings, all with no debounce. It was my twisted pair extension wiring that was picking up the bad signals and passing to Mach. The signal was so poor Mach had no chance. I cut a 2 1/4-8 thread in steel today, and it worked perfectly! Hats off to Hood!!!!
last night I was going crazy because of very erratic threading. I read a few threads on this forum, and it was Hood that got me thinking correctly. I've got it working today, and want to share. The secret is to have a perfect index pulse. I had faked my spindle speed into being stable by using major debounce in both Mach3 and ESS dialogue boxes. This is only hiding a serious deficiency once you try to cut threads. Hood said"No debounce". My signal wire was picking up so much noise without debounce that my spindle speed was registering in 8 digits with spindle off! I hooked up my cnc4pc spindle pulse unit to the c3 board with the shielded cable and presto - no more bad rpm readings, all with no debounce. It was my twisted pair extension wiring that was picking up the bad signals and passing to Mach. The signal was so poor Mach had no chance. I cut a 2 1/4-8 thread in steel today, and it worked perfectly! Hats off to Hood!!!!