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Messages - TonyP

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131
General Mach Discussion / Spindle Speed Control
« on: October 02, 2007, 03:12:50 PM »
Hello again,

I'm still having trouble with the spindle speed control in Turn.
 I can get very good control with V2.0.65 which is the latest 'old' version that I have. The new V2.48 just gives incorrect numbers in the True speed display, the loop is not controlled and the spindle just gradually ramps up.
Reverting to the old version puts things back to normal.
Something seems to have changed.


Tony

132
General Mach Discussion / Re: Backlash and spindle speed problems in Turn
« on: September 29, 2007, 10:02:39 AM »
Brett,

thanks for that, it seems to have sorted out the jog problem.

I'm still left with the speed being uncontrolled. It looks as though the index pulse is not being registered, although I can get the led in diagnostics to go on & off. The system worked very well with the old version.
What is the minimum pulse width for the index?

Tony

133
General Mach Discussion / Backlash and spindle speed problems in Turn
« on: September 28, 2007, 10:43:49 AM »
Greetings all!
This is my first post, although I've been lurking for some time.
I'm in the process of rebuilding a Boxford TCL125 lathe that I aquired some time ago. Everything has worked ok so far and I had good stepper & spindle speed control using the existing motors & drivers (although I may change the stepper drivers at a later stage). This was around last Christmas using V2.0.023.
For various domestic reasons I've just picked up the job again, and updated the software to the latest V2.48.  The backlash compensation seems to produce a strange variation in the step rate, which I can only remove by turning it off. ( yes I have a little backlash in the z axis)
The spindle speed feedback does not read correctly or control the speed, which just ramps up. All my settings seem the same and I can recover the original performance by revertiing to the old version.
Any suggestions?

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