Burned Forstner bit - Woodworking Talk - Woodworkers Forum
 
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post #1 of 3 Old 09-18-2012, 05:13 PM Thread Starter
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Burned Forstner bit

I burned a Forstner bit drilling some holes in some 1" plywood studs for electric chase holes in a knee wall. Can I just have it sharpened? How do I know if the bit is toast, unusable? Thanks.
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post #2 of 3 Old 09-18-2012, 05:40 PM
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Originally Posted by mojotuba View Post
I burned a Forstner bit drilling some holes in some 1" plywood studs for electric chase holes in a knee wall. Can I just have it sharpened? How do I know if the bit is toast, unusable? Thanks.
I have a cheap Forstner bit set. I know how easily this set can burn instead of cut.

You should be able to sharpen, but even with "sharp" edges, the design may not be good at cutting.

I started to turn Pepper Mill blanks, and decided to purchase some Colt Maxi-Cut Forstner bits after seeing a video and reading good reviews. What a difference. The design as well as the better steel cuts with so little effort.

You may end up needing to make a two pass, first with 1/2in and then follow up with the 1in.
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post #3 of 3 Old 09-19-2012, 09:18 PM
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There are several different Forstener bit designs. The ones with the smooth sides, no teeth are sharpened with a small triangular file just on the cutting edge, not around the perimeter. These are not the best choice for your task. Forstener bits aren't great for hand held drills, better in a press.

Plywood studs? Maybe laminated studs or plywood gussets, just use an inexpensive, ordinary paddle bit.

Your eyes are the best at determining if anything is sharp or unusable. Have a good overhead light and look directly on the edge that should be sharp. It doesn't matter if it's a handsaw, chisel, drill bit or whatever. You should not see any dings or light reflecting off a sharp edge.
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