Re: [CAD_CAM_EDM_DRO] Timing belts

I have used 200 pitch (.2") belts to drive a high
precision optical scanner which was powered by a servo
motor with 1000 count incremental encoder. I tried
several other appraoches before I used the belt
because I expected cogging and backlash. Reluctantly I
turned to the belts. I made a fixture to measure any
irregularities such as those I mentioned above and
found to my surprise that it was completely free of
inaccuracies including dynamic lag such as you might
get from a rubber coupling. It went into production
and worked very well. We were able to move the motor
to set the tension so we didn't need an idler. You
need to do it this way also, or use a rigid idler, not
one that is sprung. We used ordinary 200 pitch belts,
probably from Stock Drive Products.
John Guthrie

--- mmeyers1111 <mmeyers1111@...> wrote:

> I'm building a 3ft by 4ft router. Has anybody
> successfully used
> timing belts to control gantry movement and could
> you recommend a belt
> type and a supplier? Should I expect backlash
> problems controlling
> movement over a 4 ft distance? Other problems?
>
> The belts and pulleys seem to be relatively
> inexpensive, it seems
> relatively simple to implement, and gantry speed
> could be changed
> easily with pulley diameter changes. How come
> timing belts don't seem
> to be used more for cnc router control?
>
> Mike
>
>
>
>
>
>
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