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Rotary Broaching for Asymmetric Hole?

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Mick B103/06/2023 17:10:30
2444 forum posts
139 photos

Hmm... Thanks, it hadn't occurred to me there'd be any particular limit to the depth, except if the taper on the broach caused it to become too thin to take the side-stress, unlikely in this case AFAICS.

I'll take another look at it. Looks like I might be able to try asking them the question on their enquiry form.

Edited By Mick B1 on 03/06/2023 17:14:33

Michael Gilligan03/06/2023 18:59:57
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23121 forum posts
1360 photos

Coming to this thread rather late … but I have to ask : Wouldn’t this job be better-suited to a conventional ‘push’ or ‘pull” broach ?

MichaelG.

Mick B103/06/2023 20:30:31
2444 forum posts
139 photos

I've put the question to Hemingway, with a pictorially corrected drawing as a pdf.

I'll see what they say.

 

 

Edited By Mick B1 on 03/06/2023 20:31:13

JasonB03/06/2023 20:42:28
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25215 forum posts
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I did see a US supplier that says their square rotary broaches will do 2 x AF so you may be OK though it's going to need a hefty lathe to push it through I would think.

Hopper04/06/2023 05:20:56
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7881 forum posts
397 photos

The boss being 22mm thick adds a new dimension to the job. Scratch what I said earlier about filing it! I was assuming it was the more usual valve handle thickness of 10mm or less.

Can you find someone with a shaper, slotter or slotting head on a milling machine? That would make short work of such a job, starting with the 12mm drilled hole. Maybe one of the forum shaper owners could help if the job is for a railway volunteer group or whatever?

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