Hi,

I am looking at machining some intricate patterns in copper. I have tried but the standard sherline stepper motors do not seem to be up to the task as well as the standard spindle. The only modifications to the machine are the kerk motion leadsrews and anti backlash nuts.

I am after some advice on what is best. I am looking at possibly upgrading the spindle to a VFD running up to 24000 RPM ( 0.75 - 1KW and am unsure of the best brand ) and then a G540 driver with keiling stepper motors.

I do currently have the 10000 RPM kit but from reading some forums it looks like I might need more RPM hence im looking at the VFD. The only other material that I machine is tooling board.

I would really appreciate some help as I do not have a local shop that specializes in mini mills in New Zealand.

Thanks

Harvey