Hi

I fix the problem on mechanical part and test the machine again:
It cutting two rectangle with the same dimension and with good accurate (x:60*y:50 mm) but when i cutting a circle the dimension on X axis is 60.52 and Y axis is 60.5 (circle diameter is 60 mm ) please see attached picture, circle has dimension 60 mm on green position.

http://s24.postimg.org/3zm42b4lx/image.png

Why the circle is not accurate? i cutting another circle two but it is the same with first.

I am wait for your reply.

Thank you