by ober » Wed Jun 15, 2011 9:28 pm
well, it depends on your target and objective. If you are planning to do a XY table for demo and short term usage, the conventional potentiometer is sufficient. If you plan to create a XY table for long hour operation, you need to source for better quality potentiometer.
Another concern is the interface to potentiometer. The potentiometer that we use in PR24 is 10 turns, and this might not be enough for XY table as the distance is quite long.
Rotary encoder is one of the options, but it will cost you a lot.
Still, you will need to study more.