@chrishamm Thank you. That's exactly what I was looking for.

Re: OpenAPI definitions
Will there be an update of the OpenAPI definition for software version 3.5.x?

In the CNC world 0-10VDC VFD spindle controls are standard. Only a few VFDs accept also a PWM input. Of course that can be solved with an external PWM to analog converter. But I prefer an integrated solution like the Azteeg X5 GT has:

http://www.panucatt.com/azteeg_X5_GT_reprap_3d_printer_controller_p/ax5gt.htm

Are there any plans to add a 0-10VDC output to control a VFD spindle drive?

Thanks for the new RC!
I tried G53 to G56. All is working as expected.

Thanks for your great support.

I hope you understand my explanations.

1. e.g. G10 L2 P1 X100 and then G54 G0 X20 -> absolute movement to X120 in machine coordinates (G53 G0 X120). The same result without WCS is to move absolute (G0 X120) or moving the MCS after homing (G92 X-100 and then G0 X20).

2. The offset apply to all tools, when you are using the G54 coordinate system.

I use often more fixtures to mill the same part. With the WCS I can jump easy from one fixture to the next.

In my opinion most cnc users would be happy to have 3 or 4 sets of tool offsets.

Yes, that is exact what I need.