Re: [CAD_CAM_EDM_DRO] Smithy CNC

Walt & Craig Smith wrote:

> this is basicly "engraving" using a ball mill. I have tried
> different feed rates (slow to ultra slow) faster speeds, light cuts,
> different mills, drowning it in lube--in short everything I can think
> of and still get mill marks in the cuts (whick will later be anodized
> and look like shit)

Ball end mills will not leave the best finish even in a Bridgeport if
the depth of cut is too great. Has a lot to do with the clearances and
the fact that the center of the cutter is at virtually zero surface
speed. Try recutting your engraving with a finish pass a couple thou
deeper and see if it doesn't improve. I've heard of some folks engraving
with a center drill, might give that a try also.

Jon