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SmoothStepper USB / Re: How to use closed loop spindle rpm with SS
« on: October 21, 2010, 12:23:44 PM »
So what this boils down to is there is no way in Mach to control spindle speed with the index signal? Or am I missing it?
The doc linked by Jeff talks about tuning spindle speed and stuff, but I don't think it mentions if we can actually adjust the spindle speed to the index signal. I guess that is "closed loop" and it simply doesn't work. It seems that if one has an index signal to Mach, Mach should adjust the spindle PWM to achieve the commanded S RPM.
My problem is if I have a pulley setup, say Pulley 7, to 300-3000 RPM, at 2000 I'm pretty close, but at 1000 I'm low and at 3000 I'm high. If we can't have index feedback for spindle speed, what's the correct way to adjust linearity? I've read to delete linearity.dat and not use Calibrate Spindle. Is there a way to get the linearity better?
All PWM control with SS is done in SS settings, right? Mach settings ignored?
The doc linked by Jeff talks about tuning spindle speed and stuff, but I don't think it mentions if we can actually adjust the spindle speed to the index signal. I guess that is "closed loop" and it simply doesn't work. It seems that if one has an index signal to Mach, Mach should adjust the spindle PWM to achieve the commanded S RPM.
My problem is if I have a pulley setup, say Pulley 7, to 300-3000 RPM, at 2000 I'm pretty close, but at 1000 I'm low and at 3000 I'm high. If we can't have index feedback for spindle speed, what's the correct way to adjust linearity? I've read to delete linearity.dat and not use Calibrate Spindle. Is there a way to get the linearity better?
All PWM control with SS is done in SS settings, right? Mach settings ignored?