Re: Broaching , a question

"Snag"  wrote in message news:utvdti$2bued$1@dont-email.me...
On 3/26/2024 12:23 PM, Jim Wilkins wrote:
.....
   I made a couple of shims from some .050" galvanized sheet . Probably
going to make some more of varying thickness so I can fine tune the
depth . I made the slot in the guide bushing the same depth - measured
from the round - as the width of the broach at the bottom end .
   The project got delayed a bit because I stripped the old DRO off the
mill . The new ones are a lot better but there was a good bit of
fabrication to adapt to my mill .
Snag
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IIRC the proper depth of a key slot is half the width, measured from the cut edges, so a square key will fit half way into each part. I tend to need oddballs such as different width slots, the motor/pump shaft (metric?) existing and the pulley matching one of my broaches, and a custom T shaped key. There are even offset keys to advance timing on small engines modded for racing.