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Make your own Allen screws.

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andyf:
My inventive pal Mike - he of the swing-up toolholder - has developed a tool for rotary broaching of triangular, square, pentagonal, hexagonal etc holes in the lathe. Simple and cheap; we like cheap, don't we?  :thumbup:

 http://mikesworkshop.weebly.com/rotary-broaching.html

Andy

Bernd:
Thanks for the link Andy.  :thumbup:

I remember doing hex broach work at the place I used to work at. Only difference was we used large turret lathes and under power.

Bernd

andyf:
Just for clarification, Bernd, Mike's broach is for use under power, with the spindle turning. Contact with the workpiece causes the cutter to rotate in its holder. As the tool is at a very slight angle, each successive corner takes a little peck at the workpiece as it rolls into contact. You will have worked that out for yourself, but responses on another forum seem to show some folk thinkinking the tool is simply being rammed into a stationary workpiece, gouging out the corners as it goes in

I must ask Mike whether he feeds the tool in under power, or cranks the carriage along by hand.

Andy
 

AdeV:
From the description, it sounds like he hand-feeds the carriage in (using the tailstock for extra "push" if required).

I like the way he used his toolpost holder as both a toolholder AND a jig to make the cutters. Clever stuff!  :smart:

Bernd:
Andy,

The turret lathes I worked on had 50hp motors on them. There was two ways of doing the broach. One being using the power feed on the turret or using the weight of the turret to broach manually. So both ways were used, power and manual. There were also speical holders the let the broach sort of wobble. Same effect as you mentioned by being off center slightly.

Bernd

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