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Sharpening Forstner Bits

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Forum topic by Jim Jakosh posted 12-28-2009 06:18 AM 4656 views 2 times favorited 6 replies Add to Favorites Watch
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Jim Jakosh

11493 posts in 1764 days


12-28-2009 06:18 AM

Does anyone have a slick way to sharpen Forstner bits? Like which way to you sharpen the flat area and what do you do to sharpen the teeth around the edge?

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!


6 replies so far

View KnotWright's profile

KnotWright

247 posts in 2146 days


#1 posted 12-28-2009 06:31 AM

I did a quick search online, here’s a few good examples for you:

http://www.wwch.org/TechData/Forstner_Bit_Speeds.jpg

http://www.youtube.com/watch?v=bt4weRZs0HM

There are a lot of other pages on this topic, but these two actually show two different methods of doing it.
I tend to use the first method, since it only requires a few tools.

-- James

View AJswoodshop's profile

AJswoodshop

1057 posts in 935 days


#2 posted 09-14-2012 12:29 AM

Jim,

I have never sharpened my Forstner bits. But, I thought I heard my Grampa say that you could sharpen them on a drill doctor. Not sure thou, I love my forstner bits, I got them at a auction for only $9 dollars! It’s a 20 piece set!

AJ

-- If I can do it.....so can you! -AJswoodshop

View HorizontalMike's profile

HorizontalMike

6939 posts in 1572 days


#3 posted 09-14-2012 12:50 AM

Rat tail files come in handy here. Finer toothed, better “sized” for bit sharpening, and easier to control IMO. And I try to only minimally sharpen at any one time, in order to keep as much of the bit as I can. In this sense, I sharpen more frequently but less aggressively.

-- HorizontalMike -- "Woodpeckers understand..."

View Jim Jakosh's profile

Jim Jakosh

11493 posts in 1764 days


#4 posted 09-14-2012 01:02 AM

Thanks, James for this info, that is what I thought. I have been sharpening the flat with a diamond hone and will now try to uses round stone on the curved area.

AJ, I have see a drill doctor and they tend to sharpen just the point of a drill and do a back cut to thin the point for less resistance when drilling without a pilot hole. I don’t thin they would address the surfaces of a forstner.

Hi Mike, they must not be too hard if a file will cut them. I’ll have to try that too. That U tube video was a good one but it showed a big one being sharpened. The ones that get dull the quickest are the 3/8, 1/2 and 3/4. I use them the most- especially the 3/4 one. I try a file to all the surfaces of the 3/4 one and see how it works!!
thanks, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View HorizontalMike's profile

HorizontalMike

6939 posts in 1572 days


#5 posted 09-14-2012 09:43 PM

While I do not know, I do suspect that some of the cheaper Forstners are made with softer steel (I am NOT saying SOFT) than the highest quality bits. As a hobbiest, I just do not use them so much as to need to buy the best, though I understand that desire to have the latest/greatest at all times urge.

-- HorizontalMike -- "Woodpeckers understand..."

View Jim Jakosh's profile

Jim Jakosh

11493 posts in 1764 days


#6 posted 09-14-2012 11:23 PM

Hi Mike. some say HSS but it may not be hardened High Speed Steel. that makes a big difference!!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

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