Bergerund is correct...the rotating sharpening method dresses the spiral cutting edges, but does not touch the very tips of the three spirals. Again looking thru my 10x loupe, the three spirals terminate in very small beveled points much like the (much larger) points of a twist bit. I'm wondering if these could be dressed with a very fine diamond plate or ???? in a manner similar to sharpening the points of the twist bits....looks like further experimentation is required...see the attached crude sketch...any thoughts are welcomed...
I found this on Youtube
http://www.youtube.com/watch?v=m7Bz4xrJ8mM&feature=share&list=FL9uk8vkwvX 6Lqybos-oar5A&index=19
" The Hurdier I Go, The Behinder I Get"
That's our Kevin.
Having a little cutter grinding experience in my 40+ years as a machinist I just want to say that by spinning this cutter in reverse and using a diamond stick will put an edge back on the cutter but at the same time it will reduce the angle of the primary cutting edge. As this reduced angle is changed the bit will after a few touch ups will start to rub and not cut. Just my 2¢ worth.
CarverJerry
ver. 1.188 Win 7- 64b with 6 GB ram @ 2.8Ghz and dual 1Tb hard drives. Rock Chuck & Ringneck vacuum system hooked up to a Harbor Freight large vacuum. Center line text, conforming vectors.
I'd like to add something to this discussion of re-sharpening carbide bits. I've long been able to successfully touch up conventional carbide router bits when they began to burn wood while cutting with a router. All the advice gained over the years from master craftsmen who did this was to use a diamond plate or paddle and strictly to lap the face of the carbide that first meets the wood.
Never try to sharpen the backdraft of the carbide as that changes the shape of the cutter and will quickly lead to an out of balance bit.
The CW bit challenge therefore is to work down in those flutes of the carving or cutting bit and as much as possible only up at the top edge. I purchased a set of diamond dust coated needle files including one that tapers almost to a point from about 1/8th inch diameter. I chuck my carving bit in a hand drill just to steady it and then follow each groove (flute) with the file and use the increasing diameter to stay right up against that edge that needs a touch up. Because the file is riding in the flute you can even follow the curve right up and onto the tip.
I'd like to know what others think on this and will try to provide some photos and file set details.
Last edited by Capt Bruce; 01-16-2014 at 02:16 PM.
Fair winds,
Capt Bruce
Kinney deSigns http://kinneydesigns.us
CarveWright START U Team Member.
30 year USN SEABEE, the original Weapons of Mass Construction.
Designer Ver 1.187 and 2.007, Ver.3.001 One 2009 B CW w ROCK and a 5th Year Anniversary C CW
Rotary Jig, 2D and 3D, Tracing Probe, DFX and STL Importers
.
Capt. Bruce. Correct me if I'm wrong, but are you touching up the front (cutting) edge from inside of the flute? In other wise, and I know it's not much but you are making the flute larger (wider)? This would keep the angles, both primary and secondary relief angles untouched and would do ok if you can get ALL the way down on the very tip, which is what usually gets dull first.
CarverJerry
ver. 1.188 Win 7- 64b with 6 GB ram @ 2.8Ghz and dual 1Tb hard drives. Rock Chuck & Ringneck vacuum system hooked up to a Harbor Freight large vacuum. Center line text, conforming vectors.
CarverJerry,
Yes, that is the exact edge I'm touching up with this method. You would think that probably 85-90% of the wear on one of these carving bits (and probably most cutting bits) is in the first 1/4" of the cutting length if one carves shallow projects. In general this is not a CNC directed re-sharpening but it sure seems to work wonders with my collection of used bits and extends their use better than running a bit in reverse against a stone.
Fair winds,
Capt Bruce
Kinney deSigns http://kinneydesigns.us
CarveWright START U Team Member.
30 year USN SEABEE, the original Weapons of Mass Construction.
Designer Ver 1.187 and 2.007, Ver.3.001 One 2009 B CW w ROCK and a 5th Year Anniversary C CW
Rotary Jig, 2D and 3D, Tracing Probe, DFX and STL Importers
.
How fine is the grit on that diamond dust file? Mine all seem to coarse for that.
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