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Re: Hex Broaching?
Obviously you need to ensure that the broach is kept perpendicular to the part's face for the entirety of the broaching process. Hex broaches take some patience to get through, but taking your time will go a long way in helping out.
If you have a lathe- you can simply start the part there and move it to the arbor press to finish to get a nice straight broach. If you do not have open access to a lathe, you can try this:
I've had success making jigs and guides for broaches. Essentially I just machined a part that had a large face to mate against the part I was broaching. I drill and broach the guide to same size I was broaching my new part. I carefully feed the broach through the guide, lined up the hex properly, and put the whole stack together on the press and then began broaching my new part slowly, especially in the first few teeth.
Also make sure you are liberally lubricating the part you are broaching as well as the broach itself.
-Brando
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