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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Broaching , a question
Date: Tue, 26 Mar 2024 13:23:42 -0400
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"Snag"  wrote in message news:ututu3$1u2oj$1@dont-email.me...

   I'm getting ready to broach my first keyway with an actual broach .
My question is about the shims , and how thick they need to be .
Measuring the difference between the first and last tooth on the broach
I get .062" and I'm wondering if that is the correct thickness for the
shims .
Snag

-----------------------------

My 3/16" keyway broach came with an 0.050" shim. For the others I shear 
strips of scrap sheetmetal and add one between passes until the key fits. My 
guide bushings are all shop-made to eyeballed depth.

Thinner shims leave less unsupported broach, but if the shim is too thin to 
hold the bend the broach may pull it through.