Hi All
I am a newby at mechanical engineering so forgive the stupid question. I have just converted my old Tom Senior Milling machine to CNC, (well seemed a good idea when I started).

I have 5mm pitch ball screws and 200 (1.8o) steppers. I have set the micro stepping drivers to 4 (800).

Upon test I find 1 unit or x, y, or z = 5mm or one complete turn of the motor. I would have thought having set the units in Mach3 software to mm, that 1 unit of x,y,z should be 1mm ?

I tried out the miller using the TEXT wizard setting the height to 3 units and sure enough the writing came out at 15mm high.

Now I have not got as far a drawing anything and importing it into Mach3.

Can anyone advise if my thinking is askew ?

Many thanks for any help

Joe