Well first of all you seem to be jumping all over the place and not concentrating on trying to sort the problem out in a logical way. It is no use just trying random changes. So take it one step at a time giving clear and concise feedback.
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Some good pictures of the machine would help, are you using ball screws or screwed rod etc? You have already been asked to check the pp voltage out put. ie is it 3.3V or 5V but you have not answered. This might just be a simple pp and bob problem.
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Sorry to be a bit harsh. ..Clive