3-axis Grizzly CNC Conversion

Guys,

Thanks to the valuable information drawn from this list, over the
spring and summer I've had a lot of fun learning CNC technology and
applying it to my first CNC conversion. My Grizzly G8689 is now
controlled by my old PC running CNC Pro. Very cool...no more
tiresome hand cranking, and perfect circles are a breeze. Check it
out at:

http://home.cinci.rr.com/hardball/CNC.htm

I'm happy with the accuracy of the mill, at least on the X and Y axes
(+/- 0.001). The Z-axis has some accuracy problems under certain
conditions, but at least it's very repeatable, and under most
conditions the movements are accurate to 0.002 which suits me fine.
If I need better precision, I'll get another mill (and spend more
than $500).

Axis speeds are limited to about 10-12 ipm. When milling arcs, the x-
axis seems to be limiting the speed. I have to reduce the feed rate
to 2 ipm on a 2 inch diameter or the X tends to wander. I may
upgrade X to a more powerful motor.


Dave Polan