machining technique for cylinder - revisited

[rmatel]

Original post at end...

I ended up centering in 4-jaw, turning 1/2 length to 1 1/2" OD, reversing in chuck and finishing the length to 1 1/2". I then drilled and bored to 1.000". To finish the OD, I made a mandrel ( 10" length between centers) ala Phil Duclos's "stub mandrel" technique and mounted my stock near the tailstock. Ended up with a wall thickness of +/- .0005.


posted 08-27-2003 08:00 PM
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I need to make a tube of cast iron..2 7/8" long, 1.000" ID, 1.3755" OD.
Problem is,, I didn't think it through when I bought the material; I have a 3" long piece of cast iron.
If I had a longer piece I could chuck it up and bore the ID and turn the OD with the same setup.
OOPS!!
Any suggestions to salvage this or should I just get another, longer piece of stock??? I have an 8" 4-jaw chuck as well as other "goodies" however, I'm using a 12" swing, 3in1 lathe/mill.

[gamachinist]

Sounds like you did a good job there,rmatel!
Congratulations,Robert.

[CCWKen]

Dang! .0005 is good enough for the drag strip. Lets go racing!
"Big Factory" engines don't come that close. Great Job!