Re: These servo motors worth a darn?

At 07:30 AM 10/20/99 -0700, you wrote:

>what the screw is doing. What I am not sure of is if having the motor
>and the encoder separated by a timing belt might introduce any sort of
>servo error. If there is even the slightest wrapup or lag between the
>belt and screw (most noticable when accelerating a heavy load from a
>stop)

If your drive is designed for those loads to begin with it would not be a
problem.

I've used a Chevalier mill with belt drive and linear scales on the axes.
Same difficulty arises in principle there. The machine never displayed any
signs of being out of step between motor and motion. This is a very typical
setup in modern machine tools. I don't think it would be so popular if it
had that sort of error associated with it.

Best wishes,

Hoyt McKagen


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