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Thread: Sharpening countersinks
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03-17-2013, 07:25 AM #21
This could be checked by chucking a single tooth CS in yor lathe and placing an edge of a cutter in the compound parallel to the cutting edge of the CS. Then rotate the chucked CS say 180 degrees and crank the cutter in until it is against the side of the cone. Does the angle change or does the cutter remain in full contact with the side of the cone? If cutter is swung and spiraled in the angle will change. If it advances spirally as driven by a fixed lead screw it will remain parallel.
Denis
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03-17-2013, 08:40 AM #22
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03-17-2013, 09:20 AM #23I was trying to grind 3-fluted csinks.
Was the drill running in reverse?
Nick
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03-17-2013, 09:38 AM #24
'3-flutes' usually offer plenty of room to get a wheel into the flute. Helps if you have a cg, tho'. I'd face the flutes as long as you can maintain a reasonable primary land width at the cutting diameter. After that, top-grind but keep relief angle low and let 'em feed slow into the cut with that in mind.
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03-17-2013, 05:53 PM #25
It does sound like some mentioned earlier, the flute was not timed correctly with the cam.
Poly choke as well as R & A machine indexer shown previously will do that work fine on multi-flute tools....Just so long as first flute is placed correctly.
smt
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03-17-2013, 09:49 PM #26
You need a machine like a RO grinder, aka Royal Oaks, now owned by Seneca Falls Technology. These are cam operated grinders, been around since the 50's or 60's
Royal Oak® Grinders
I have one of the machines that I am rebuilding. They have a very detailed manual that is used with their machines but I would assume would also work with other cam operated grinders as to how to set up for various tools.
Tom
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04-03-2013, 11:31 PM #27
I was on vacation for 3 weeks and just got back. I wanted to post pics while I was gone but did not have them with me.
Here are some pictures of a solution using a simple spindex modified to sharpen single-flute countersinks. It will have additional
add-ons and applications as time goes along. I believe the patent posted previously by Heavy Metal in this thread may be a simpler and better solution for the sole purpose of single-flute countersink sharpening.
"Heavey MetalHere is one solution
Patent US4638603 - Device for sharpening single-flute countersinks - Google Patents"
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