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broaching a keyway

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David Hill 5	04/09/2022 18:07:45
30 forum posts 1 photos	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.
JasonB	04/09/2022 18:12:15
25215 forum posts 3105 photos 1 articles	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
old mart	04/09/2022 18:21:18
4655 forum posts 304 photos	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.
Andrew Johnston	04/09/2022 18:28:22
7061 forum posts 719 photos	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
David Hill 5	04/09/2022 19:07:53
30 forum posts 1 photos	Thanks Guys, I appreciate your comments and won't abuse my lovely mill........ David

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