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Thank you all very much for the opinion, now I have got a direction to think about, appreciated to every experts here!

Hi every expert:

I am thinking about choosing HobbyCNC board for my first CNC converting project. Seems like this board is perfect for all 4 axis control, but how to control the speed of the main...

Well....Mike, I suggest you draw another drawing in AutoCAD to detaily discribe your parts. I think regarding the tolerance, you better tell the CNC engineer how are you going to fit your part, and...

Well......is it a 12V DC output power supply?
I had Proxxon tools before, and I did open it up to see the power supply (mine is a engraver)

I think it is just a normal 12V DC power supply, you...

Well...I am just a beginner who is preparing to convert a mini milling machine to a CNC. Thanks for all of you who gave the idea. I know the only disadvantage of using a stepper motor is it might...