Re: [CAD_CAM_EDM_DRO] servo motors for BP clone

Thanks Jon for the reply. My existing setup has 550 oz-in steppers with acme
screws and 2:1 belt reduction. I can get 80 ipm rapids with that. A few dc
servo motors I have seen so far had watts rating on them. How do you
calculate the torque from that.

Zafar

> Zafar Salam wrote:
>
> >Hi,
> >
> >After running my BP clone on steppers and acme screws for 6 months, I've

decided to upgrade to ball screws and servos. What size motors would be
suitable for that purpose. I'll go with geckos and turbocnc. I would
appreciate help from anyone who has alread done that as this would be my
first experience with servo motors and drives.

> >
> >
> It depends on whether you plan to direct-drive the screws, or use a belt
> reduction.
> A much smaller servo motor can be used if you use the reduction. For
> instance,
> a 4:1 reduction will increase torque to the leadscrew by a factor of 4.
> I am
> using motors good for about 250 Oz-In peak with a 2.5:1 belt reduction.
> Some people who really want to show off how fast their machine can move
> insist you need LOTS more torque. But, I find this system is strong
> enough to
> snap 3/8" end mills off in the collet without faulting the servo, and
> can do 120
> IPM with no problem. That is WAY more than I need, and any more would
> just be
> a hazard.
>
> Jon
>
>
>
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