NordicCNC's build log

[NordicCnc]

A JMC 180W might be enough power wise, but industrial servos are much more sophisticated. Encoder resolution, motion smoothing (much needed for high accel when the controller doesn't handle S-curve motion profiles), vibration suppression, ...
To be honest I also had a different machine in mind from what you're planning when you stated your requirements :)

For calculating the required motor, I simply plugged the numbers in Yaskawa's calculator (SigmaSelect).
It's a 2005 ballscrew coupled with 1:1 pulleys (I would have liked to go direct-drive, but didn't have enough space to inline the motor). The axis can reach 30m/min because servo max speed is 6000 rpm. Ballscrew critical speed is not a concern since it's short (400mm) and could in theory handle 13'000rpms.

Yes the axis is all steel, but the spindle is only 2.2kW ISO20 30krpm. The goal is high-speed aluminium milling.

Thanks for the link to the calculation software, this will be very useful to me.

Myself I think I am going to consider a 2005 ballscrew for the Z-axis. My ball screw length is also 400mm long and who would not appreciate a 15m/min rapid feed rate! Originally I planned for a 1605 with a 2:1 reduction, since I worried about whip (ball screw critical speed) and increased inertia (180W servos). These things are no longer an issue!

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