rotary broaching

rotary broaching

This topic has 7 replies, 6 voices, and was last updated 28 January 2020 at 18:54 by old mart.

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27 January 2020 at 22:41 #449380
David Taylor 4
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@davidtaylor4
I made up the Hemmingway rotary broach kit and it works well using a male broach. Reading the proprietary manufacturers literature they claim that a female broach can be made using the male .

I tried this and the result did work but of course it lacks clearance and is a tough go in use.

Any ideas how to give clearance in a female broach with out using a file?
Advert

27 January 2020 at 22:41 #19607
David Taylor 4
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@davidtaylor4
extrernal
28 January 2020 at 07:13 #449405
not done it yet
Participant
@notdoneityet
Make it with a slightly over-sized male broach?
28 January 2020 at 08:55 #449412
Martin Kyte
Participant
@martinkyte99762
Posted by not done it yet on 28/01/2020 07:13:17:

Make it with a slightly over-sized male broach?

That only gives you a larger sized, straight sided broach with no clearence. A rotary broach wobbles (which is why it's sometimes called a wobble broach so for a female broach the hole down the middle needs to open up to give clearence. Hence the OP's question.

I don't know the answer because I would use a file. Possibly using a male broach to create the initial hole so NDIY is not entirely on another planet.

regards Martin
28 January 2020 at 16:45 #449462
David Taylor 4
Participant
@davidtaylor4
One attempt I made was to mount the broach on the top slide . I set the top slide over at 1.5 degrees and feed into the female blank. I thought it might give some clearance but it was not obvious that it did.

Filing clearance in a .06"A/F hex hole is not easy.

The attraction of the rotary broach was to produce small hexagons for which bar stock is no longer available and avoid setting up the mill with dividing head.
28 January 2020 at 17:26 #449465
Grindstone Cowboy
Participant
@grindstonecowboy
I'm not entirely sure I understand the female broach part, but could you grind relief with a Dremel or die-grinder?
28 January 2020 at 18:14 #449473
Howard Lewis
Participant
@howardlewis46836
Surely, if you use a male wobble broach to produce a hole, the male broach will have clearance, and cut easily, but the hole will have parallel sides, so that there is no clearance for a cutting edge?

To provide clearance behind the cutting edge, the female broach would need to have the cutting edge as the smallest dimension, with a hole behind it to allow the swarf to fall away.

Howard

.
28 January 2020 at 18:54 #449483
old mart
Participant
@oldmart
If you are lucky enough to have a mill and rotary table, why would you ever need a female broach?
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