Rotary broaching - the easy way

It's a pretty neat but simple process. Would be nice if you could buy sets of broaches for common features such as metric hex and Torx sockets at hobby prices.

The tools are a bit more tricky to produce due to the internal taper but the same basic setup would also be usable for external features, as illustrated in this commercial video that follows on eventually from Mike's. Has anyone tried that yet?

Murray

Haha - he says it's capable of accuracy of "5 tenths of an inch or better". He actually means half a thou in English, not half an inch!

Edited By Muzzer on 06/05/2016 10:26:38

What a brilliantly simple solution! Well done, Michael Cox.

Does anyone see why a Torx hole could not be done? Would the re-entrant shape affect things?

Noticing the original posting date makes me wonder (again), just how many masterpieces are lost in the archives...

Roger

If you watch the video I posted, you can see that Torx and others are actually relatively simple. It's a std industrial process - nothing lost really?

Ah, I watched Michael's video. Now I'll watch yours, Murray.

Roger

Edit: Yes, that was interesting Murray. I noticed that they made a point of adding a slight lead-in chamfer on the internal operation, it's the sort of thing one would probably do automatically for an external operation, but may not think of for the internal case. At least, I think that I wouldn't think about it. Hmmm, ...thinks...

When I referred to 'lost in the archives' I wasn't talking about the process, but about the simple-yet-effective implementations developed by M.E.s. Those that read it at the time Michael originally posted would undoubtedly have made a mental note for future reference, but those of us who came later were blissfully unaware of it until the thread was re-awakened.

Edited By Roger Head on 06/05/2016 12:56:40

Edited By Roger Head on 06/05/2016 13:12:26