Motor is a 2kW varicon
Manual control by potentiometer, cnc control by Mach3
Been fiddling with the steps but dont quite understand what they do
When I started to set the spindle speed the step was at 20 giving the results in my first post
Changed step to 10000 outcome at1000 rpm on control 1414 rpm on tacho at 2000rpm 2400 rpm on tacho
Changed to 8000 outcome at 1000 rpm 1080 rpm at 2000 rpm 1850 rpm
Dont now exactly what I am doing obviously