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Thread: Sharpening countersinks
03-17-2013, 07:25 AM #21
03-17-2013, 08:40 AM #22
03-17-2013, 09:20 AM #23I was trying to grind 3-fluted csinks.
Was the drill running in reverse?
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.
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.
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.
04-03-2013, 11:31 PM #27
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"