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thanks for u advice.
numerical data telling me how stage deviate form center line or top/bottom reference surface should be enough for this job?New seneor its not that expenseive 3-500each.if I...

I want to build a very precise motion system(based on hydro/aerostatic rail),it;s a DIY project with serious budget constrain.
So I want buy a cheap system to measure parallelism of motion...