Hemmingway rotary broaching kit

Hemmingway rotary broaching kit

This topic has 3 replies, 4 voices, and was last updated 4 July 2025 at 09:02 by jimmy b.

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3 July 2025 at 21:21 #805829
YouraT
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@yourat
Hi.

Does anyone know if there is enough “meat” in the Hemmingway rotary broaching tool kit to allow it to use broaches with a 1/2″ shank?

I believe it’s designed for 8mm shank tools, but the 1/2″ versions are a lot cheaper…..

Thanks!
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4 July 2025 at 06:26 #805852
Diogenes
Participant
@diogenes
No – the toolbits clamp in a sleeve supported in bearings, so these limit the bore size with little room for expansion – there’s an ‘end-on’ view on their website that illustrates the point.

If you want to use 1/2″ toolbits I don’t think it’d be too hard to scale the plans around a set of larger bearings..
4 July 2025 at 08:14 #805856
bernard towers
Participant
@bernardtowers37738
When you say the toolbits are a lot cheaper do you intend buying in??
4 July 2025 at 09:02 #805858
jimmy b
Participant
@jimmyb
Having made ghe Hemingwaykits rotary broach and used commercial 1/2″ (and bigger) ones at work, I would advise getting the appropriate tool holder.

Also, having broached 8mm hex in 303 stainless at home, I guess you’ll need a powerful lathe for larger broaching.

Jimb
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