Greetings all;
I have added a jump, over the broken tool, if I think I know where it is,
at the transition from the end of the 3rd corner arc, to the straight X
run for the near side of the button. Only effective while cutting the
3rd button of 4 from this workpiece.
But in reducing the depth of cut from about 77 thou, to 21 thou in
deference to the fragility of a 1/32 end mill, I am probably not getting
the correct chip load, so at 2500 revs for a 2 flute 0.03125 diameter
solid carbide end mill, what would be a feed speed that would keep it
busy making decent sized chips for its size, but w/o overstressing the
mill?
Or is 21 thou still too much dig in ebony?
There s/b a formula to do that, but its probably buried in the #27
Handbook and I've not memorized it.
The gcode is reducing the depth of cut slightly as it descends into the
slot, so the last cut is about half the first cut. That you can see in
the attached snapshot4.jpg.
The top of the button is also being tapered inward a few thou because the
workpiece is .255 thick and the tools cylindrical portion is only .200"
inch long, but the cutting edges extend up the taper. That will be
mostly removed by a roundover operation separate from this. There is
also a possibility when I get to the main buttons I need by the sandwich
baggy full, of doing the roundover first, then digging it free in the
groove the roundover leaves, theoretically easier on the 1/32 mill as it
won't have to dig so deep. That wouldn't be too hard as the path you
see is the center of the tool path. In fact I might try that on the
final button here after I get the 3rd one cut loose. With the path you
see, the difference is depth of cut, and that tool can do it in one
pass, its a monster with a quarter inch shank compared to the teeny
mill.
If its actually buried in the end of the arc, thats another problem and
I'll just skip over the arc & break it off & sand to shape. But until I
break another mill on it, I think I am skipping over it.
Thanks everybody.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
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