Quote Originally Posted by Agathon View Post
I quickly concluded that the motor has insufficient torque at this speed.
[pedant mode] The motor should have the same torque at any speed provided the VFD is not limiting current. It's the lack of gearing that means there is insufficient torque at the spindle[/pedant mode]

As I understand it Mach3 while it's possible to tell Mach3 the spindle speed it cannot change the pulley setting automatically. It would have been nice if one of the four motor speed control relays could have been linked and operated by this feature of the software, but I guess I'm hoping for too much! In any case I'll have to set the variator manually.
Mach 3 can via Macros. I've never done it, however you can use a Macro that takes the requested spindle speed, and changes gears accordingly. Probably worth having a search for gear change over on the Mach forum.