Robin2:
How many steps per revolution are you using?When you measure the distances actually moved by your machine and find an error, how many steps would be needed to "achieve" that error? For example if there are 800 steps per mm and the error is 0.25mm then that is equivalent to 200 steps.
Motor is rated for 200 steps per revolution moves 1mm. I am doing running it in Full step mode.
For the second part, Does the following info suffice?
http://i67.tinypic.com/2nhna5h.png
I am thinking of getting this motor Pololu - Sanyo Pancake Stepper Motor with Encoder: Bipolar, 200 Steps/Rev, 42×24.5mm, 3.5V, 1 A/Phase, 4000 CPR with a built in encoder and test each part of my system separately(The Code, The motor if its skipping steps, The mechanical arrangement for any backlash or any other error) With the above motor I guess I can find the answer to whether motor is skipping steps in no load condition.