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David Billington

wrote:
I found that forcing a ball bearing thru a channel using an arbor
press works really well for a certain project I am working on, to
resize a passage.

It was something I thought of as an economical alternative to building
a ball broach.

The size is 1.375, and I would like to open this passage up a few more
thou, so I was trying to come up with a way to do this.

I had thought that I might try getting a few of these balls HARD
CHROMED. My thought here would be the diameter would increase, and
the hard chroming would be durable (?) enough for multiple uses. I
know it will not be an exact process, so if I took 10 ball bearings in
and had them all done, I might have have one or two that are sized
just right.

I am not looking to debate the different ways to resize a hole, as for
this particular project, broaching it works very well. Just need some
real world, productive and positive suggestions as to whether hard
chroming, or some sort of electroplating option would be a viable
direction.

Thanks to all who help!

Maybe worth enquiring if one is already available for the purpose in the
size you require http://www.precisionballs.com/ballsizing.htm