Re: Broaching , a question

On 26/03/2024 20:40, Snag wrote:

On 3/26/2024 12:58 PM, David Billington wrote:

On 26/03/2024 16:42, Snag wrote:

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 .

>
Is it a shop made broach or bought. All my Dumont broaches come with appropriate shims to cut the keyway to the correct depth.
>

>
  It's a couple of broaches only from eBay . I machined a guide slug for it from some 416 SS I bought to "have some on hand in case I need it" and pushed it with my 12/20* ton HF press . I made shims from some .050"  galvanized sheet I have on hand (being a Pack Rat is often a Good Thing) and it worked out quite well . I'll never broach another keyway on the lathe ...
>
  *12 ton frame with a 20 ton air operated jack on it . I have beefed up the frame where it was necessary .

Maybe some of the information in the Dumont catalogue would be of use. It gives the broach lengths and the thickness and number of shims required. https://kar.ca/pdf/catalog/en/Dumont_Catalog.pdf