Bit Brace with Amidon Jaws

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Forum topic by whitechev posted 03-23-2015 09:42 PM 918 views 0 times favorited 1 reply Add to Favorites Watch
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9 posts in 1155 days

03-23-2015 09:42 PM

I recently purchased a beautiful old bit brace. The brace has Amidon jaws just like the ones here-

and here (on the right)-

My question- did Amidon jaws use some sort of spring mechanism? I am thinking the answer is no. If that is the case, were the jaws just left to flap around loosely when there was no bit in place?

Also, the jaws are someone damaged. Does anyone know if reproduction or replacement Amidon jaws are available anywhere? Or if there is another type of jaw that might be somewhat universal and may work in this brace?



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View screwikea's profile


19 posts in 1935 days

#1 posted 07-06-2016 05:41 PM

Aaaaand… TIL what those are called. Every brace I have with that style of jaws in it is either sprung or the piece of metal that keeps it sprung is long since lost. The good news is that I don’t think that it’s strictly necessary, but it makes the tool a lot easier to manage.

FWIW, the “spring” is just a bent piece of wire that sits in the little ridges, shaped sort of like a big “V”. So it’s not a spring, but it functionally springs the jaw open. That way when you loosen the chuck on the brace, the jaw opens up to let the bit in. Incidentally, the fact that wire is just sitting in the jaws is why they disappear. When you completely unscrew the chuck those are super easy to let fall apart.

My personal preference is for the toothless plain jaws like this:

The spring is always still there on those things because it’s basically built into the jaws.

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