On 2009-06-24, RoyJ wrote:
We normally do 1/4" slots in a 12 ton hydraulic press.

OK, that's a useful data point.

I am done with this particular broaching task. It turns out that using
a different lubricant ("heavy threading oil with sulphur and
chlorine") helps somewhat.

The pulley is nicely sitting on the new motor's shaft with the proper
key between them.

The reason for all this is that I got a 7.5 HP single phase motor,
which will replace the current three phase motor on my compressor.
As I mentioned before, I had a three phase motor on this compressor
before.

i

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