Re: [CAD_CAM_EDM_DRO] what gear ratio ??? - more

Doug Fortune wrote:

>
> ja_erickson wrote:
> >
> > anybody out there ever used a 400 oz. in. servo motor with a .200
> > pitch lead screw ? i'm trying to find out what gear ratio i'll need
> > for a boss 5 bridgeport retrofit. any help would be greatly
> > appreciated.
>
> My guess on the 400 oz*in servo is that value is its 5% duty
> peak value, and might only have a 40 oz*in continuous value,
> not so good for direct drive milling. I'd say try a 2.5 : 1
> or 3:1 gear ratio for a start.

Let me further say, a 10:1 ratio might be best with those smallish motors,
to get decent machining power at typical machining speeds.... however the rapids
might suffer. Also, to get more than 2.5:1 or 3:1 you'll need more
than 1 stage of belt drives, which complicates things.

So all in all, try the 2.5 to 3:1 first and see if that works for you.
Put the encoder on the motor, not the leadscrew.


regards
Doug Fortune
http://www.cncKITS.com














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