Re: [CAD_CAM_EDM_DRO] Re: Servomotors & Minimill - do these need speed reduction or not?

knives01us wrote:

>Several people have reported that it takes 80 oz/in just to move the
>X or Y axis on a well set up minimill with stock leadscrews and ball
>bearing screw end mounts. This can be determined by adjusting and
>oiling everything and then wrapping some cord around the 4"
>handwheel and adding weights until the axis seems to move reliably.
>
>With this in mind, I'd gear down the servos. I used 420 oz/in
>steppers direct drive on all 3 axis of mine and it works fine, but
>the steppers peak out RPM wise at about 40 IPM rapids.
>
>

I have a 4:1 belt reduction on mine, and have run it up to 90 IPM with no
trouble. There's really no need to move such a small machine that fast,
I'm just showing off!

Jon