Sharpening auger bits - are they too far gone?

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Forum topic by WorksWoodSlowly posted 05-11-2019 01:31 AM 542 views 0 times favorited 5 replies Add to Favorites Watch
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10 posts in 986 days

05-11-2019 01:31 AM

Topic tags/keywords: sharpening drill-driver

I have a bunch of old auger bits that need sharpening but they seem pretty worn down. Can anyone tell me whether they’re too far gone? Here are a couple photos:

5 replies so far

View SMP's profile


2248 posts in 709 days

#1 posted 05-11-2019 04:28 AM

Can you post pics of the cutting edges? The screw on the bottom left looks like it may not grab? But may be able to clean up threads with needle files? Do you have an auger file?

View OleGrump's profile


577 posts in 1148 days

#2 posted 05-11-2019 02:48 PM

As noted in the previous post, the lead screw on the bit on the right side of the photo has become blunt (broken or possibly dropped at some point…?) While an auger file would be the most ideal, even a small triangular file will work to sharpen your bits. Hold them with the lead screw on a scrap block of wood and angled away from you. File the flat cutting edges at the base. Don’t touch the “ears”, unless they are VERY dull. In which case, a LIGHT filing on the INSIDE of the ears will be all that is needed. NEVER X 3, file the OUTSIDE edges of ANY bit. this will not only decrease the boring diameter, it will ruin the bit.
BTW, your bits aren’t so bad. I’ve seen them in FAR worse condition. After some “elbow grease” they have been put back into service again.

-- OleGrump

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10 posts in 986 days

#3 posted 05-11-2019 03:50 PM

My worry was that the lands were too short to file anymore – maybe that they’d been filed so many times that there was only a stub left (that’s why I showed the side view).

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10 posts in 986 days

#4 posted 05-11-2019 10:55 PM

Here are some more photos of the cutting edge. In the first one I included another bit that works well. Notice how the cutting edge on the left hand bit has a much longer profile. That’s what made me wonder whether the right hand one was too worn to save. Or is that difference irrelevant? The other photos are different views of the one that won’t cut.

View WoodenDreams's profile


1091 posts in 714 days

#5 posted 05-13-2019 04:44 AM

I have a couple auger bit sets, and the only ones I use and not very often is the standard length 3/4”,7/8”, and 12” long 3/4”. Just cheaper for me to just replace with new. The 2nd picture right bit I’d put in the scrap metal bucket. The others, It might be worth it if you want to take the time and patience..

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