I have a large (3.5") Forstner bit that has lost its edge. Is there a
DIY way to sharpen it, or is this something that must be done by a
professional? It looks like I might be able to hone the teeth and the
knife edges, but I'd like to hear what you folks have to say about it
before I do.
Here's an instruction page that I printed out years ago:
Highland Hdwe has one at
or better yet http://tinyurl.com/kvresl
should open a white paper on the subject by Highland Woodworking.
If it doesn't, go to http://www.highlandwoodworking.com
scroll to the bottom of the listing on the left under "More Info" and
click on the link "Woodworking Tips Map".
In the right column near the bottom of the page under "Woodworking
Library", click on the link "Sharpening Forstner Bits"
That is a fast and heavy way - I like a cone stone myself.
Use a curve to sharpen a curve.
What I see with the Dremel method - while fast and 'easy' - it can
cut notches and make a wavy line if one isn't perfect in the use.
A stone can be used wrong, but does less in a second to clean up later.
Tom Veatch wrote:
I recall that some sixty-five years ago, ie before diamond tools and
suchlike, my revered woodwork teacher told me (with some satisfaction) how
he had managed to sharpen the peripheral edge with a triangular engineer's
I've never tried it, but I imagine it would get into the corners more easily
than the rotary and other tools.
Jeff Gorman, West Yorkshire, UK
email : Username is amgron
I've never sharpened a Forstner.
However, I've sharpened a lot of other tools in the shop. Most of them
successfully. One of the things that has helped me with my approach
towards sharpening is Leonard Lee's book "The Complete Guide to
Sharpening". It's a bit of a heavy read, but virtually anything that can
be sharpened is covered in that book. I recommend it to anyone who ever
thinks they'll have to sharpen any woodworking tools especially, but
most tools in general.
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