Ivan Vegvary wrote:
1948 Pontiac Hydramatic needs a spacer so I can install non-original
seals between the transmission output shaft housing and the drive
line.

Spacer: Outside diameter 2.017" +0, -0.05: Inside diameter 1.500"
+0.05, -0: Width approximately 3/8".

How best to make this on a lathe. Material would be a 3" square of
aluminium about 3/4" thick. Have 3 jaw and 4 jaw chucks available.
Mind you, this is simply a spacer. It will not rotate or have
anything moving against it. I suppose I could buy a bunch of large
washers, bore them, place on an arbor and reduce the diameter and
then stack them up until I reach approximately 3/8".

Any advice, especially lathe procedures would be greatly appreciated.

Thank you,

Ivan Vegvary

Is absolute concentricity an issue ? How accurately will your 3 jaw center
? I'd grab it in the 4 jaw to bore the ID , then move it to the 3 (with
inside jaws) to bore the OD . Then you can use either one to machine it to
length , whichever works best for that length . You might consider using a
hole saw to remove most of the inside and a bandsaw to trim the OD . Save a
lot of machine time ...
Oh , and your tolerances , did you really mean .05" ? I'd think .005"
might be more in line with the application . --
Snag