"Bob La Londe" wrote in message
...
"Ed Huntress" wrote in message
...
On Sat, 14 Apr 2012 16:49:57 -0500, "Greg O"
wrote:

How many parts?
One or two, no idea.
Many? Roller burnisher.
Greg O

Neither ball sizing or roller burnishing is appropriate for thin
tubes.

I was waiting to see the wall thickness before commenting, based on
industry practice rather than my own experience, but I either missed
it or it hasn't been stated.

We did a lot of roller burnishing when I was at Wasino. You need some
resistance to make it work. I don't think it would iron out a weld
seam, regardless. It's used to size and to flatten the peaks of the
bore's surface finish.

Similarly, ball sizing. Unless those tube walls are quite thick, I
can't see it ironing out a weld seam. It probably would just locally
stretch the tube, unless the tube has very thick walls. That doesn't
seem likely if it's seam-welded.

.125" wall thickness.

Lathe jaws machined to match the OD, take a light pass with a boring bar to
remove the weld, and roller burnish.
A hone will work too, but the roller burnisher will give a much smoother
finish.

I have bore many aluminum small engine blocks .010" over size with a Sunnen
hone with AN 500 stones and Sunnen's honing oil.

Either way you will need to get the cylinder cleaned up before any type of
finish can be done.
GregO