Quote:
Originally Posted by scopemankit
Thanks guys, the idea of a linear motor is unusual,....
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Not quite - what you made is exactly what is in that "linear" motor..
I am sure it is actually conventional motor inside with threaded rod or geared rack & pinion or something similar (with encoder in a form of potentiometer).
http://en.wikipedia.org/wiki/Rack_and_pinion
Your solution is way cheaper, and quite adequate for the purpose (in terms of precision, load capacity and so on).