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 Hi, Jim 
I have been just setting up the same hardware. I do not have 
such 
a problem, although I have a homing issue (soon to be fixed we 
think). 
I suspect that you just have the gain too high on an 
axis. 
Or you may have an offset. 
Could you describe the amps, motors, and other hardware you 
are using? 
A good first cut on pid that can be done with no 
instrumentation is the 
Zeigler- Nichols closed loop tuning method. It worked quite 
well on EMC 
for me. Plenty of information about it on the net- or I can 
explain further 
if you need. 
Les 
Leslie Watts 
L M Watts Furniture Tiger, Georgia USA http://www.rabun.net/~leswatts/wattsfurniturewp.html engineering page: http://www.rabun.net/~leswatts/shop.html 
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