forum.cncdrive.com

Hello Everyone,

I have a 6040 Router that I replaced the stock drivers and motion control with a G450 and Uc100 and Uccnc software.

After calibrating all the axis I did some test cuts in first wood and then plexiglass. The hole size and shape is good enough, but one thing I did notice is
The hole is slightly bigger at the top then at the bottom. I have confirmed this with a gauge plug. What I am doing is cutting a pocket .625. I check the size with a .625
gauge plug and at the bottom of the hole the fit is what you would want. At the top the gauge plug is a tad loose. I readjusted the Spindle tram to with in .004 in the X and Y. any other ideas as to what might cause this? Thanks.

Charlie

a coupling loose?

Flex in the machine is probably the only thing that could cause a tapered hole.

is it stepped or tapered?

Thanks for the replies.

Its not stepped. the pocket is just looser at the top then at the bottom of the pocket. At first i was using a 1/8 bit. the feed rate did not seem too fast 40 ipm.

I changed the size of the pocket to .625 and then using a 1/4 in bit retested. its no as bad. Thanks for the suggestions.