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Forstner bits

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Forum topic by Monte Pittman posted 543 days ago 715 views 0 times favorited 8 replies Add to Favorites Watch
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Monte Pittman

13716 posts in 962 days


543 days ago

Topic tags/keywords: question

Is there any good way to sharpen them. None of my local guys will touch them.

-- Mother Nature created it, I just assemble it. - It's not ability that we often lack, but the patience to use our ability


8 replies so far

View bondogaposis's profile

bondogaposis

2476 posts in 975 days


#1 posted 543 days ago

They are easy to sharpen. Watch.

-- Bondo Gaposis

View cutworm's profile

cutworm

1064 posts in 1417 days


#2 posted 543 days ago

View Kazooman's profile

Kazooman

58 posts in 576 days


#3 posted 543 days ago

I don’t like the method in the second video. I would avoid touching the front bevel of the cutter just as the guy in the first video suggests. I would clean off any pitch or other residue, but beyond that messing with the front edge is asking for trouble. Those edges should be perfectly perpendicular to the shaft of the bit and they should be at the same depth. Using the Dremel tool runs the risk of messing up one of those properties and then you could have just one blade cutting or just a portion of a blade cutting.

View paratrooper34's profile

paratrooper34

760 posts in 1576 days


#4 posted 543 days ago

Monte, I agree with Kazooman, the second video shows how NOT to sharpen a forstner bit. When you sharpen these types of bits (including the self-feed types), you only sharpen the flats on the angled part of the bit, just as seen in the first video. When you sharpen the flats on the bottom, you risk changing the geometry of the bit. As you see in the second video, he sharpens the area on the inside perimeter of the bit, but the rotary tool does not sharpen all the way to the edge. This leaves a small portion of that area slightly longer. When you move to sharpen the flats on the bottom, you effectively change the depth of that area in relation to the small unsharpened portions on the perimeter. That will then leave you with a bit that will not cut because the small portions that are deeper on the perimeter will not allow the cutting surface on the flats to actually reach the wood. If you only (correctly) sharpen the angled area, you will not change the depth of the bit.

Hope that made sense. Good Luck!

-- Mike

View tefinn's profile

tefinn

1207 posts in 1061 days


#5 posted 543 days ago

I use these to sharpen my forstner bits.
http://www.harborfreight.com/10-pc-diamond-needle-file-sets-6989.html

They do a really nice job on the smaller ones. Takes a little longer on the larger ones where a diamond card would be faster.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

View pudtiny's profile

pudtiny

21 posts in 585 days


#6 posted 542 days ago

This is how I do mine: http://www.instructables.com/id/Sharpening-Forstner-Bits-1/ please note some of the useful comments.

Pudtiny

View Roger's profile

Roger

14311 posts in 1428 days


#7 posted 542 days ago

Good post Monte… and, Thnx for all the links from ya’ll.

-- Roger from KY. Work/Play/Travel Safe. Kentuk55@bellsouth.net

View Monte Pittman's profile

Monte Pittman

13716 posts in 962 days


#8 posted 542 days ago

I have diamond blocks on order as we speak

-- Mother Nature created it, I just assemble it. - It's not ability that we often lack, but the patience to use our ability

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