Re: [CAD_CAM_EDM_DRO] Sizing servo motors for BP size mill

Jon Anderson wrote:

> Jon,
>
> Yeah, I figured out the difference in motor specs pretty quick just
> looking at numbers. There's a SoCal outfit selling a PC based retrofit
> (http://www.cnc-in-a-box.com/) and offer two motors, 19 and 29 in/lb.
> Don't know if these are direct or belt drive. But it's trying to pin
> down a rating such as this that I'm after. I am assuming these are the
> continuous rating...

Most likely. For a BP size machine, you need at least 75 oz-in continuous,
and probably about 300 oz-in peak, with a max RPM of at least 2000.
This is for a system with a belt reduction.

If you go for direct drive, you probably could double these torques,
and cut the RPM in half.

These are very rough numbers. of course.

Jon