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bit brace modification

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Blog entry by handy_andy posted 02-12-2017 12:38 AM 633 reads 0 times favorited 3 comments Add to Favorites Watch

I’ve been moving towards hand tool work but I didn’t want to buy a new set of drill bits for my grandfather’s bit and brace that takes square shank bits. Three jaw bit braces exist but the chucks they use are disappointing.

Some poking around revealed that the chuck on the brace is held in place with a rolled spring pin.

I knocked the pin out and measured the chuck shank to be 0.485” in diameter. I bought a 1/2” drill chuck with a JT33 to MT2 adapter. Since a morse taper #2 is >0.572” in diameter I could turn it down on a lathe.

Using a file and my wood lathe didn’t work but I was able to borrow some time on a buddy’s metal lathe.

I made jig to drill the pin hole.

The rolled spring pin mushroomed when I tried to hammer it back it. Fortunately the ratchet mechanism is sufficiently forgiving that it still works.

It took a few mallet hits to seat the JT33 on the chuck, but I was able to bore a 1” hole in red oak.



3 comments so far

View Kelster58's profile

Kelster58

298 posts in 352 days


#1 posted 02-12-2017 02:34 AM

Now that is pretty cool. You did a great job with that. You are a genius.

-- K. Stone “Tell me and I forget, teach me and I may remember, involve me and I learn.” ― Benjamin Franklin

View Michael's profile

Michael

15 posts in 318 days


#2 posted 02-12-2017 03:27 AM

Wow! I’m impressed. I bought a three jaw brace thinking I could use my standard twist and brad point bits, but they slip in the jaws. I tried filing some flat edges on to the bits, but it didn’t work out very well. Your solution is elegant.

-- "When we try to pick out anything by itself, we find it hitched to everything else in the Universe." John Muir

View WayneC's profile

WayneC

13751 posts in 3909 days


#3 posted 02-12-2017 09:40 AM

Very nice modification Andy. I really like the look of the brace after the modification. This makes me want a metal lathe…. The slippery slope.

I bought a three jaw brace thinking I could use my standard twist and brad point bits, but they slip in the jaws. I tried filing some flat edges on to the bits, but it didn t work out very well. Your solution is elegant.

- Michael

Michael, they make drill attachments that fit in the brace that will take round bits, they normally sell for about $20 on eBay. Also, there are number of premium bit braces that take both bit types (North Brothers/Stanley Yankee, Millers Falls Lion or Holdall, Pexto Sampson or Goodell-Pratt 2500 series for example. )

-- We must guard our enthusiasm as we would our life - James Krenov

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