On Tue, 23 Jun 2009 21:39:51 -0500, Ignoramus17181
wrote:

This is my first time broaching.

I am broaching a keyway slot in a pulley bushing. The hole is 1 3/8
and the slot is 5/16". The reason for needing to broach is that I had
to bore this pulley from 1.25" to 1 3/8", to accommodate a larger
motor shaft.

I am finding it difficult to do with a 3 ton press. It does work, but
I feel at the edge of this press's capability. I am concerned
that, perhaps, I am doing something wrong, or the broach is dull. So,
my question is, what would be a normal force required for broaching
iron bushings with a 5/16 broach. The bushing is about 2 inch deep.

I am using tapmagic cutting fluid.

i

Check here

http://www.dumont.com/prodc.html

a 5/16C broach at a 2.5" loc will need 3960 pounds to push it through.

At 2" LOC you're most likely at 3000 or so......


Thank You,
Randy

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