> Can you tell us what the motor will be driving in the live 
> system, so we can see what the problem is?

It is for a human arm supporting system. One motor (the light one)
drives a spindle that keeps the whole thing upright (a gravity sensor
privdes feedback). The other motor (heavier one) drives a spindle that
puts tension on a spring to compensate for the weight of the (human) arm
and what it holds.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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