h a l f b a k e r y"Look on my works, ye Mighty, and despair!"
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Sleevecutters can easily and frequently become
clogged with a 'plug'
of the material being cut through, and are rendered
useless until the plug
is removed. Such clogs can be unnecessarily time
consuming to clear.
I propose a pneumatic drill which has a 'clear' trigger
that directs a
blast
of air through the center of the sleevecutter to
blow the clog out.
This has the added benefit of allowing a sleevecutter to
perform
double duty as a compressed air wand for cleaning the
work area of
dust/debris as you go.
[link]
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How do you clear a sleevecutter now? Poke your
finger there? Used toothbrush? Tame beetles? |
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Pry it out with a screwdriver or other similar
implement. |
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If I understand correctly, this would need a
pneumatic connection to the sleeve-cutting bit, no?
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Instead, why not have a lever on the back side of
the sleeve cutter bit, that pushes the slug out? |
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That's one more moving part to fail, [MB]. |
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Yes, but if it's pneumatic, how does the air connect
to the back of the bit? Or does it come up the bit's
shaft? Ah - wait: //through the center of the
sleevecutter// OK, as you were. |
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Can you define a sleevecutter (or post a link). I was
picturing a hole saw since it has the problem you
are solving, but when I Googled sleevecutter, I
found no drill type device that could get jammed as
described. |
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And (+) for anything with compressed air that can be repurposed to shoot things :-) |
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I tried Googling it to provide a link but couldn't find
it either, oddly
enough. It does the same thing as a holesaw but
doesn't need a pilot
hole and doesn't have those aggressive, saw-like
teeth. At work, we
typically use them to make pilot holes for the
holesaws. The holesaws
use a pilot hole to keep from 'walking' so your hole
stays centered
properly. The sleevecutter usually is used with a
fixture with bushings
in it to guide it straight and true. A
sleevecutter
bit looks like a 6-inch (generally... They do get
bigger) steel tube with a
hole all the way down the
center. The cutting end is steeply concave, with a
very sharp edge
that, if you look closely, is notched slightly to aid in
cutting. Maybe
Google calls them something different, but I have
no idea what.
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Norm, I'm so glad I wasn't the only
one who thought of that... |
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newer holesaws have an L shaped space to give a screwdriver a good lever point. You must be doing a large number of holes. Wouldn't the cutting edge's size and shape, material waste flow design be more the problem here? |
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This may describe what is known as a core drill. The
larger ones have a vacuum for the dust. |
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I wonder if there is an integral cooling fan in the thing you have been calling a sleevecutter, 21? Maybe you could tilt it to vent thru the tube.
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If there were a spring that extended down the center of the cutting sleeve, the core of material would push down the spring as it accumulated. When there was no more resistance in front of the core (you have cut through) the spring would push the core out. The spring could be made fairly robust, as it is the pressure exterted by the machine operator that pushes the core in and the spring down.
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This would not be too hard to mock up. Just stretch a spring to the length of your cutting cylinder and epoxy it to the machine, then attach the cylinder around the spring.
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OK, norm. I know you miss the shooting. If there was a trigger one pulled to release the spring, one could withdraw the sleevecutter with core inside, pull the spring release, then shoot the core into a small basket set at some distance to the side. Epoxy puttying a spring to something falls within my skillset. Trigger spring releases, not so much. |
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The sleevecutter is just a type of bit that works with many kinds of
drill. |
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//sleevecutter// hole saw ? |
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/The sleevecutter is just a type of bit/
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If it is a bit then the male part held by the drill is solid. How would the blast of air get in the center of the bit? Or does your concept require redesign of the bit also? |
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As I said, it's a hollow tube. There's a hole that goes all the way down
the length of it. The way I currently clear a clog is to pop the
Sleevecutter out of the drill and jam a sufficiently narrow drillbit
through the hole to pop the plug out from behind. |
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So rather than having to hookup to an air supply you
could just design the whole drill to have a hollow
shaft so you can stick a rod through the hole to
clear the bit. |
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Yes, but the sound of compressed air is so much more annoying. It makes me want to get a job cutting these holes just so I can send morse code messages to my cow orkers. |
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How about recursive teeth and recursive waste material holes then the dust will never clog the tube. |
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