layout question - notching tubing

Dec 06, 2006 7 Replies
R

I have a two part fit-up / fabrication question...



I have a 24 inch diameter drum, and I want to join a 5 inch pipe to the side of it. I want it to be a flush mount, so how can I mark the side of the tubing to get the right radius cut on it? I do not have the drum here yet, so I would like to cut the 5 inch pipe before hand. Any suggestions?



Secondly, I also have to cut a hole in the side of the drum for a 4" pipe to fit inside. How can I mark out a cut in the side of the 24 inch drum so the 4 inch pipe is a nice snug fit? If I were to take a compass (the high school drafting style) and set it for a 4" hole, center punch the drum then make the circle, will that be right? I think the curved side would complicate this dimension???



Sorry, these may be basic questions but I have very little experience with this type of fab work.



thanks, ron



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C

I asked a somewhat similar question a while ago. Check this thread:

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Wes S

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S

Ron, Your concerns are valid, but the solution is simple. I use template (construction) paper and scissors. First cut a 24" circle in the paper. second lay the edge of the paper over the end of the pipe and mark the curve on the pipe. Do this on both sides of the pipe. This curve will not be perfect, but it is very close. Cut the pipe and hand fit to the side of the drum with a 4" grinder. Then using the fish mouthed pipe, mark the drum and cut accordingly. This works fine for one each, but if I had to do many, I would make the proper tools. Steve

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R

Somewhere I've seen a small program that lets you input your diameters and it prints out a paper template you can cut out, then wrap around your pipe surface.

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C

Need a big printer for a 24 inch pipe though. Even for a 4 inch.

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R

See if Marv has anything

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D

I used to do exactly this at work with a CAD program and D-size plotter. Add about .05" to the diameter to compensate for the paper thickness. But that is indeed not reasonable for most folks.

Dave

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