Re: Hand-sharpening drill bits
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since vevor goes up to 13mm bits, that would be the top end for ER20 collets. On the larger machine (MRG-20 - link below) on the comments I found vevor answering the collet size question with "
3-13 is ER20, and 14-20 is ER25"
Regular ER25 don't go that high and if you look at that product, the collets are non-standard)
So vevor and grizzly both use ER20 collets.
It is possible that the guts of both machines are the same, with the grizzly having the right side rotated 90 degrees from the vevor.
On Wed, Aug 7, 2024 at 9:35?AM Mark Kimball via <markkimball51= [email protected]> wrote: I've thought about building a version of gadgetbuilder's 4-facet sharpener (to be found ) but for now have decided to see how the Vevor does.? That vendor can be a mixed bag in terms of quality so it's a bit of a gamble on my part.? I should know soon, I just got a notification that it will arrive sometime between now and 8/12.? Hopefully in one piece.
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The Grizzly version uses ER20 collets but it remains to be seen if the Vevor does.? I didn't see any specifics in their product literature.
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Gadgetbuilder's design has been built by quite a few other folks, including one version that uses mostly 3D printed parts.? Lots of interesting variations, the main thing is to achieve the right geometry for the profile(s) you want.? IIRC, some folks have built adapters for it so they can sharpen end mills.? Probably just the bottom face, that's the easiest to sharpen.
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Buffalo John
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BuffaloJohn