Messages

1

General Mach Discussion / Re: Threading problem with Mach 3 Turn

« on: December 18, 2008, 05:32:53 PM »

I shouldn't have said "return pass", I meant the second, and subsequent passes don't match each other.  I do have sufficient clearance specified.

I am a real neophyte with G codes, exactly what are you suggesting I do?

Thank you all for your answers on this.

2

General Mach Discussion / Re: Threading problem with Mach 3 Turn

« on: December 18, 2008, 11:02:56 AM »

Thank you for your response and I will try that (I can't get back to my shop until tomorrow).

To my specific question:  does Mach 3 modify the Z axis feed rate to match a varying spindle speed or does it require the EXACT speed specified in the wizard?

3

General Mach Discussion / Threading problem with Mach 3 Turn

« on: December 18, 2008, 06:24:42 AM »

I have just equipped my old Logan lathe with steppers and have successfully gotten pretty good results on the control of the X and Z axes.

I have a Hall effect device (the vane is almost 180 degrees, good long pulse) for the index sensor. It is working fine and the software gives the correct speed.

When I try threading the return passes are way out of sync. with the threads being totally screwed up.

My question: Does Mach 3 need the spindle speed to be EXACTLY the speed specified in the threading wizard or does it continually modify the threading (Z axis) speed to match the spindle speed?

If it is the former then I need to change my motor to one that is WAY more powerful (presently a 1 hp treadmill DC variable speed).