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Post by Pete on Jun 9, 2014 22:13:56 GMT
Quick question for any factory people here...
I bought 2 new fingernail profile bowl gouges about 2 months ago, both of them have a hollow in the bevel at the lower left hand side of the factory grind, I remembered it today as I resharpened and noticed that I have almost removed the hollow on one of them.
I always sharpen tools when new, but do so with the lightest touch as they are pretty much perfect when shipped, but the slight hollow being almost identical in position and shape got me wondering if the original grind was an automated process.
So my question is:- How is the original grind put onto gouges in the production line?
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Post by Jeff Farris on Jun 10, 2014 13:17:54 GMT
Pete,
I can confirm, after my first factory visit, that the fingernail profiling at the factory is done with exactly the same jig that you have with your ProEdge. The linisher is much larger than a ProEdge, because it is used for other jobs as well.
A very slight hollow is probably an oversight. It isn't being ground in there consciously.
Personally, I prefer the line from the back of the bevel to the point of the tool to be as straight as possible. I would lean toward a slight convex line rather than a concavity.
A concavity most normally comes from under-grinding the point of the tool.
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Post by Pete on Jun 10, 2014 15:49:45 GMT
Jeff
Thanks for that, I use a Tormek T-7 for my sharpening, but once you are used to the jigs & the grind recipes, getting a repeatable edge is fairly straight forward on most systems, like you I go for straight with a hint of convex, which is almost exactly what the factory grind is, I back up the recipe with marker pen which is how I spotted the hollow initially,
For most of my "used" tools it's more a question of taking a dull edge to a shiny edge, I do experiment with different grinds, but usually on almost end of life (when the flute doesn't fit in the jig and I have to grind a flat on the bar to hold them, however I don't really go for much re-shaping these days, I find that the factory grinds give me repeatable quality on mixed timber / output, where the fancy grinds you may get excited about on demo's tend to be specialised for one shape from a particular type of wood.
It was the hollow being almost identical on 2 tools (3/8" & 1/2" I was spoiling myself) made me wonder if there was some form of CNC type automated sharpening system in the factory. As a manual process then I guess the engineer had a worn heal on his left boot that day :-)
I should add the cutting edge shape was as always spot on, the hollow was towards the bottom of the bevel and only a matter of a few thou.
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