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Post by Clive Brooks on Nov 12, 2017 8:58:42 GMT
Hi Chico...The Robert Sorby ProSet has 4 preset protrusion settings giving you 50, 45, 40 and 35 degrees
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Post by Pete on Nov 12, 2017 12:48:09 GMT
What I would like to know is almost a ready reckoner for gouge projection length versus angle. Obviouisly 2" projection comes out to 45 degrees but I'd like to save all the metal without having to resort to trial and error. There are presets which work well and cover 99% of needs, however if you have one that works better for you at 46.5 degrees then the simple way is to put marker pen on the bevel, touch it to the sharpener of choice, you want a nice clean line of ink removed, if it's removed from the front of the bevel push it forward a fraction, back move it back a fraction once you have your sweet spot it's simple to make a measuring block to suit your needs for next time. Losing the metal should only happen when trying to find your preferred shape, once you have it right you really are just polishing a micron or 2 to get it sharp again. Always start with the recommended angles and see if that works for you, if it does then the factory supplied jigs will help keep the bevel repeatable, but your height compared to chuck central height may make it better to be slightly customized which means you have to start making custom measuring jigs to repeat the grind. I still use the marker pen method on my roughing gouges every time because they are pretty much always done by eye, with the occasional recheck of my eye by removing ink before metal!
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chico
New Member
Posts: 8
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Post by chico on Nov 12, 2017 22:08:13 GMT
Just for clarity this isnt with the pro edge but with the 446 with the fingernail grind jig. I know about the marker pen trick but to work out say 60 degrees it is trial and error with projection. I would keep a note once found but having a basic protrusion for projection length would be so simple. I suppose I could just try with a gash bit of round stock,
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Post by Pete on Nov 13, 2017 14:30:18 GMT
With you now, you are looking to re-profile rather than maintain one.
I used the 446 jig for a while but as I remember it you have to make your own positioning base, so a fixed protrusion to angle can't be stated but has to be worked out as you go.
What I did to make up my measuring jigs, and practice it's use was to buy a length of wooden dowel, flatten the top of it with 2 passes over my surface plane (that's an exaggeration, it's a 4" planer! but handy for segmenting work) to measure from and ensure it was always clamped the same way up, and grind that to various angles. Obviously took seconds and I could whip the the end off on the bandsaw and start again.
The other thing I did was buy a bunch of cheap gouges at a car boot and practice my use of the jig on them until I was happy with the results and angles, before grinding away my Sorby metal.
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chico
New Member
Posts: 8
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Post by chico on Nov 14, 2017 16:51:36 GMT
Pete, thanks for getting back,Sorby states that the front of the jig is 1/2" from the front of the wheel so seems to me that measurements are possible.I am using CBN wheels so the stated distance will not change. I don't think I would be happy grinding wood on a wheel. I'll get some bar stock and play.
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