On 2/28/23 16:47, Matthew Herd wrote:
You could use a slotting strategy and tabs (at the bottom) to retain the piece
if you wanted to save the material. Then cut the tabs out by hand. Optionally
do another finish pass after manual removal if the wall surface matters. But
I’d probably just use an adaptive strategy to turn it into chips. Easier and
probably faster. As long as you can clear the chips without standing there
with an air gun or vacuum.
I'd cut an undersized spiral down to about 30 thou from the bottom, some
few smaller than the desired hole, leaving a few at the bottom uncut to
hold the plug. Then expand the cut to the desired size and go all the
way thru into a sacrificial materiel. The plug will then have a little
room to move when its finally cut thru.
Going that deep I'd rig a mister on the tool and a vacuum to clear the
chips. The mister will make a huge diff in the quality of the cut.
On Feb 28, 2023, at 3:53 PM, Todd Zuercher <to...@pgrahamdunn.com> wrote:
I need to mill about a 3.75" hole through a piece of aluminum about 1.75"
thick. What is the best strategy to accomplish this on a cnc mill. Is it best to us a
pocketing strategy and mill out the entire hole from the center out, or would it be
better to use some kind of cutting strategy and mill some size slug out of the middle? I
can see the first option being simpler, but the 2nd option saves a potentially useful
piece of material, but with the added complication of how to hold and prevent the chunk
of scrap from wreaking havoc when cut free.
Todd Zuercher
P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php>
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
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Cheers, Gene Heskett.
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