How do I uniformely increase diameter of a .500 Inch diameter abs plastic solid cylinder to .515 diameter? Can it be dipped into another plastic or epoxy…then harden and turned down on a lathe? How about dipping a cold abs cylinder into liquid abs?
Is there any reason you can’t just start with a larger diameter rod and turn it to .515"?
It depends on how hard you want the surface to be. You can simply wrap electric tape about the rod to get the desired diameter. If the surface needs to be tougher multiple layers of epoxy applied over time might be better solution. You could also get a metal sleeve of the desired diameter and thickness and glue it to the surface.
I can’t vouch forthis stuff, but there are similar compounds you could use to build it up. But it’s a very small difference, you’ll need to overbuild and turn it. And once you get to turning you might as well start with a new rod as beowulff suggests. Do you need the diameter of the entire rod increased? If not a metal sleeve might be a good idea. Also, it’s probably too thick to help, but you could insert the rod in some shrink tubing and heat it.
That is a difference in radius of 0.19 mm which is just tiny and I believe anything you do will peel off. I would go with starting over again with the greater diameter.
Not positive but you may be able to heat it and compress it end to end if you hasve some way to capture the entire tube.
Eesh… you need to make the diameter bigger by less than 1/64"? That’s almost at the tolerance levels of just being dirty.
What are you doing that needs this level of precision? I’m with the others above who think you’ll be better off taking solid oversize stock and turning it down, rather than trying to add a uniform 0.0075" thick layer of anything and expect it to stay attached.
You didnt say how long it was? If not too long just warm it up in the oven and use a hydraulic jack to slightly compress it on th ends. You could easily drill out a pipe or tube to the spec you want and then compres it till it is tight, hold some pressure until it cools.
I am really curious in what application ABS and that level of tolerance is meaningful.
I just realized how small it is, drill out a piece of 1/2" galvanized pipe to the sixe you want cut your pvc so it hangs over the edges where your end caps will compress it. Just start your end caps then heat it up a bit over the stove to where you can touch it but not hold your hand on it, then screw your end caps down compressing it.
As a machinist I do a lot of lathe work. I see a problem holding a piece of plastic in a lathe rigid enough to keep a .015 tolerence as an issue to itself. A short piece of an inch long I could work with, but much longer and the workpiece will deflect away from the cutting tool.