Preventing racking?

[cncbobuk]

Thanks for a very detailed reply, my machine uses rack and pinion drives to the x and y axes so mechanically linking them would be somewhat cumbersome. I did think of a single larger motor with drive shaft passing through the gantry to drive both ends but that's a lot of work. I think I'm going to look at dual datum sensors and tuning the motors for a more reliable operation. Currently the motors drive the racks via 20 tooth mod 1.5 helical spur gears through 1:5 reduction so they are not turning at particularly high speeds. Quick question though, what exactly is the "motor corner speed"?

Thanks again,
Bob.

[JAZZCNC]

Quick question though, what exactly is the "motor corner speed"?

Briefly It's the point in the motors speed curve where torque drops off quickly leading to stalling soon after.

[cncbobuk]

That's brilliant, thanks.