Irregular Spindle Speed

[HipoPapi]

Ok well the chinese spindle is wired Star(380v) so you need to change it to delta. This will cure your speed problem.
Remove the screws and those gold jumpers can be changed around. Set them like the pic.

Regards the Speed changing when code runs then are you 100% sure the code isn't changing the speed.? Other than that then would need to see the XML to make sure spindle is set correctly.

Regards the VFD Speed then unfortunatly it's one or the other. Yes can make speed adjustable from VFD with quick parameter change but you will lose external control via Mach3.

Thanks Jazz it makes a lot more sense now. Will wire the spindle to delta on Monday and give it a try.
Regarding the speed change I am 100% sure that the speed does not change during the code as we have used an old code also we dont have a tool changer so we keep spindle speeds constant for each individual code.
Regarding the XML File would be glad to share it with you to take a look as we are unsure about its correctness specially when considering the fact that the support doesn't know mach3 and claim that the guy who set up our machine has left the company :) That makes me wonder if there was a lot of thought put into motor tuning.
Will only be able to share the XML data on Monday but thanks for the help.

BoX