broaching a keyway

broaching a keyway

This topic has 5 replies, 4 voices, and was last updated 4 September 2022 at 19:07 by David Hill 5.

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4 September 2022 at 18:07 #612354
David Hill 5
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@davidhill5
Hi Guys, can I ask a question to the knowledgeable?

I have to cut a 1/4" keyway in a cast iron flywheel. I have the broach but I do not have an arbor press. I do have a fairly hefty mill (Marlow). Would I damage the mill by using it as a press to broach the keyway? I am not sure of the forces involved. Thanks in advance.
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4 September 2022 at 18:07 #11302
David Hill 5
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@davidhill5
4 September 2022 at 18:12 #612355
JasonB
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@jasonb
Find a friend with a hydraulic press, a 1/4" broach needs a lot of force that the quill won't be upto handling.

I use an old drill press to do upto 1/8" but that's pushing it to it's limits so would not advise going any larger
4 September 2022 at 18:21 #612357
old mart
Participant
@oldmart
You could try very small increments in depth at each pass, that would reduce the strain on your available machinery. It would mean having the patience and assembling a good stock of shims first.
4 September 2022 at 18:28 #612359
Anonymous
I used my Bridgeport to cut a 1/8" keyway with a broach, and was less than happy. Never used the mill with a broach since. I now have a slotting head on the back of the Bridgeport and a proper arbor press.

Andrew
4 September 2022 at 19:07 #612363
David Hill 5
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@davidhill5
Thanks Guys, I appreciate your comments and won't abuse my lovely mill……..

David
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