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Author Topic: MACH4 CNC3040 Spindle rpm, PMW, control  (Read 1010 times)

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MACH4 CNC3040 Spindle rpm, PMW, control
« on: August 21, 2016, 12:12:50 PM »
Hi, I'm struggling to make sense of what's happening with my spindle control. MACH4, Microsoft XP, Parallel port and Darwin. I see the pulse rate affects the outcome on my speed? Is that right? My set up is on a 3040 chines mill with the router that comes with the original unit. 300 – 8000 rpm. Putting a taco on it I seem to be getting a range from 5700 to 10830 rpm, and that's trying to control it via Darwin. 0 gives me full speed and 20000 gives me 5700rpm. So from Darwin I get a reasonable range. MACH4 I'm lost.  The on/off works, PWM seems to work but not full range and same effect with the min/max freq setting. In the freq range I used 0 to 20000.  When controlling from the GUI, there is a limited response from the slider 50 % to 150%, which also has the opposite affect i.e. 50% runs faster that 150%? It put values in at the top when running, 150=50%, 300=100% and 450=150%, but I can't work out where its getting the 300 from? The PWM set up does pretty much the same.  ???

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Re: MACH4 CNC3040 Spindle rpm, PMW, control
« Reply #1 on: August 21, 2016, 01:37:09 PM »
Do you have the spindle set up correctly in M4? Also, there may be a spindle control in your motion control plugin. Make sure you have the min and max defined correctly. It sounds like you may have them backwards (not sure if that would work because I have never tried it).