As a brief introduction, this was supposed to be an action shot of my custom built whee-ler in action. Turns out that it got more action that I bargained for as the first C15 tank, the one in the picture, turned out to have a damaged valve pocket and the bee-hive end on the gauges just would not seat right. HIIIIIISSSSSSS. So I had to return this tank and score a replacement.
And two of these, an heir and a spare were also items that I scored in my travels. I had been thinking about options in connection with my problems with that drivers side exhaust flange that had been leaking and decided that if I couldn't buy a gasket, (Not they exist for this issue anyway), I would make one. What you see here is a 2 inch hard copper pipe cap, the kind that gets soldered on my plumbers when they are doing pressure tests.
What I did to it was to first shorten its overall length by removing the chunk shown above. This left me with the cap end and about 5/16ths of body. Then i used a hole saw to cut a hole in the cap end itself. I considered going with 1-7/8" for that hole but ended up with 1-3/4" which worked out exactly. The piece that I cut out is what you see leaning against the section of cap body that I removed.
And this is my engine of mass destruction. Essentially what you are seeing here is a L.S. Starrett 1-3/4 metal cutting hole saw mounted on its mandrel and stuffed into a chuck that is mounted to the tailstock of my lathe using a morse taper adapter.
The key here was "Gentle" as in lean extremely gently on the wheel that extends the tailstock sleeve or the hole saw will bind and the lathe will throw the piece of work across the shop where it will get lost.
I sort of wish I had taken a picture of how I was able to shape the round "collar' that I had left by using the exhaust flange on the shelf bandit as a form and a ball pein hammer to persuade the copper to assume the shape of the exhaust gasket surface.
However, the result I got prompted me to immediately climb into the least dirtiest of my bunny suits and slide under the van for a test fit. That exercise resulted in my adding a thin coat of High Heat Copper RTV to both sides of the gasket, setting it in place on the pipe flange, left the whole assembly into position, and running the nuts home. The whole taco is now sitting while the RTV cures thoroughly overnight.
The Nuts? Are ugly, sort of, for values of the term, because I got rid of the small nuts and used coupling nuts instead. They are long enough to completely cover the studs and prevent rust from eroding them down to memories.
Then I went across the street and used my air saw to section my neighbor's seat some more; but that is another story.
Nick