Re: Servo sizes

Jay,

1) Figure out how much power (watts) you need. Multiply inches per
minute (IPM) by the force you need in Lbs, divide the result by 531.

Watts = IPM * Lbs / 531

2) If the answer is 100W or less, think step motor. If the answer is
200W or more think servo. In between, either will do.

3) Servo motors are rated in Watts. Pick a motor that is adequate.

4) Use reduction gearing between the motor and your output shaft.
Take your motor's rated RPM, divide it by the maximum shaft RPM that
drives your mechanism (pinion RPM in your case). The answer will be
the correct reduction ratio.

Mariss


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jay" <jayelvington@s...>
wrote:

> Ok I am clueless in this area. I have no idea what the requirments
> are as far as motor sizes required to run a larger 4'x8' foot

table.

> I have decided for the acuracy I need rack and pinion is good down
> the long axis so thats what ill be working with. Seems to me motor
> selction should be made early in my design process? Any
> recomendations?
>
>
> Thanks
> Jay