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Tool Talk Discussion Forum

Broaching an inside keyway

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GIJ

11-06-2007 04:20:44

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Hi All. I need to cut the inside of a 7/8 pulley bore for a 3/16 key. I understand this is done with a broach. Where's a good place to get one and the shims/bushings that go with it? And maybe even read up on the process? Thank you very much.

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landlord7012

11-06-2007 18:54:26

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

Where are you at? I've got an attachment on Bridgeport for broaching and assorted tools for it.

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GIJ

11-07-2007 16:04:55

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Re: Broaching an inside keyway in reply to landlord7012, 11-06-2007 18:54:26

NE PA. Far? So far my search for a shop with the right tools turned up zilch. Everyone seems to contact out this type of work.

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landlord7012

11-07-2007 16:21:59

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Re: Broaching an inside keyway in reply to GIJ, 11-07-2007 16:04:55

The shipping would probably cost more than anything. Check out UPS shipping to/from 54220 (you would probably want a little insurance as well. I could probably do it for "a case of beer". Only thing is how long is the keyway (please give all dimensions again). I astounded you don't have anything close, probably a sign of the times. "Creative machinists" are disappearing rapidly. Truth is with the right tooling and the quill of a manual mill you can do some basic shaping and broaching.

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Spook

11-06-2007 12:41:09

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

I would call around to local machine shops.

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Midwest redneck

11-06-2007 12:32:38

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

You need to take that to a machine shop, It would take about an hour to do it with a broach set and an arbor press, the broaches cost too much to buy for a one time deal. A broach set is about $350 and the one broach you need is about $25 or so, not including the bushing.

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Gerald J.

11-06-2007 08:02:15

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

You could start it with a hack saw blade and finish it with a square file or a mill file on edge. Might take a few tries to get it parallel to the bore.

You could cut it with a cape chisel.

You could cut it with a lathe, drill press, or milling machine. There without anything turning, you make a properly shaped tool to cut while moving into the bore, and you shave it a thousandth or two per stroke of the tool post, or the quill. There have been lever operated gadgets made to do the sliding on a lathe to save cranking the apron left and right.

Paying the pitance to have it done with a broach in a shop that already paid for the broach 40 years ago is often most profitable.

Gerald J.

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Chris(WA)

11-06-2007 06:55:05

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

Grizzly has a good inexpensive set of broaches.

Grizzly Tool

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TomTex

11-06-2007 05:26:39

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

Can't imagine buying a broach, when the machine shop in Fort Worth will cut any standard size for you shile you wait at the counter for a flat $10. Tom

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Vern-MI

11-06-2007 04:57:36

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

Kinda pricey but you can do it if you have the associated equipment to pull them. Each tooth cuts a little deeper than the last. We found sending that work out was much more cost efficient.

MSC broach and bushing sets

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IaGary

11-06-2007 04:51:53

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Re: Broaching an inside keyway in reply to GIJ, 11-06-2007 04:20:44

What are you going to push the broach with?

For one keyway I would go to a machine shop and let them do it.

You may never use that expensive broach again.

Gary

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