allow both coarse and fine manual axis adjustment
I just use my MPG's for positioning mostly, sometimes for machining small things. They are not calibrated and 1 turn of the knob
gives about .010" so i can easily adjust position to .0001" when turning it slowly yet on fast turning you can move the axis
rapidly for rough. Two different MPG's are used as one has a higher encoding than the other so the in the case of the lathe the lower
resolution one is used on the Z axis. Velocity mode is checked. The Xbox 360 is really great for moving around with a lot of flexibilty,
such as a crawl to full rapid,but only use it when tracing out a contour in Copycat.
A little off thread, but FWIW,
RICH