I am trying to figure out how to broach a 6mm (.236") keyway into an ID (about 30mm - 1.181") about 50mm deep (2") that terminates in a hole that is drilled through from the OD and does not proceed past the hole at all.
Any suggestions. Thanks Alex
Blind internal keyway
Sep 24, 2004
7 Replies
Depending on how many you're talking about I've done that in a lathe (or mill) with a toolbit ground to the right width, holding the part in the chuck and using the carriage like a shaper moving the X axis out a little each stroke. For 1 or so it's fine for more than that it's a PITA. You can use the tailstock to push on the back of the tool post to make heavier, smoother cuts too.
JohnF
Precision Blind broaching
Westco Broach phone 626 5799600
10776 Weaver Ave So. El Monte Ca 91733
What is the material you are working with?
This is an ideal job for a shaper. If you can find anyone with one locally he would make fast work of it.
Otherwise, a large lathe with a grooving tool held sideways in a boring bar, can be made to operate as a shaper. It would take probably fifteen minutes to do the job once set up, traversing the carriage by hand.
Jim
A shaper or shaper head on a mill, not sure if you can get 2" of stroke out of a shaper head,, otherwise a sinker EDM if you have access to one.
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