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Topics - mmcdade

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General Mach Discussion / Mach 3 Threading Hangs
« on: March 30, 2019, 03:22:37 PM »
Hi,

I just retrofit an Emco PC Turn 50 lathe under Mach 3 with a UB1/UC300ETH interface.  I'm using the original index pulse circuit from Emco and I get a very clean square wave about 6ms long at 500 rpm.  The index light lights up on the diagnostics screen when I turn the spindle by hand (the lathe diagnostic plugin appears to be incompatible with the UB1).  When the spindle is running, the index pulse light comes on erratically but a scope on the signal shows the pulses to be very regular.  I can see accurate actual spindle speed and can run feed-per-revolution moves just fine.  When I enter a G32 threading command, though, that block of code just hangs with no axis movement.

I've tried setting the debounce time from zero to the default of 100x40us and it doesn't seem to matter.  Also, have tried spindle speed averaging both on and off with no change.

Any ideas about where to look for the problem?

Thanks,

Mark

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