PM-45M Gear Ratios

butchss33

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Mar 6, 2017
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Does anyone know what the gear ratios are for the PM-45M or PM-45-CNC? My RPMs do not match up with Mach3 and my RPM gage. I have about a 300 RPM difference at high speeds and they start out about 50 RPM different at low speeds. If I knew what the gear rations were, I could set them in Mach3. I really don't want to tear the head apart to find out what the gear ratios are. The Chinese instructions aren't the best. Any help would be appreciated! Thanks, Butchss33
 
I figured out that the gear ratios are 5 to 1 and 1.36 to 1. When you put them in Mach3 under Pulley Configurations, pulley #1 is set to 5 and pulley #2 is set to 1.4 as it rounds up from the 1.36. Hope this helps anyone that needs to know.
 
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