[TheForge] pipefitting question

[lama]

Kevin, you could roll up a piece of poster board or light cardboard.
Wrap it around the real pipe and tape it together to make a tube.
Your cardboard tube will be colse enough to the size of your pipe
as to not make a diference. Slip the cardboard tube off of the pipe.
It should be pretty easy to scribe the cardboard tube with a marker
and a pair of sissors. Keep working the cardboard tube until you get
the fit you want / need. Slip the scribed and cut cardboard tube back
over the real pipe and mark the pipe with a paint marker. Remove the
cardboard and cut the pipe with a torch or plasma cutter.
good luck, wear your safety glasses,
dave m


> Hey Kevin,
> I have used the "Good 'ol" layout wrap they sell at the weld supply
houses.
> It's kind of like a framer's square for pipefitters. I have one in the
shop, or you can get one at Weiler/VNG/Ferguson etc.
>
> Ray
> Cincinnati
>
> >
> >
> > All,
> >
> > I know there's got to be some pipefitting genius amongst this throng...
I
> > thought I'd found my answers at http://www.tpub.com/steelworker2/38.htm
> > instead I have more questions. Hopefully more intelligent than they
would
> > have been a week ago.
> >
> > I'm building a gantry crane for the shop using 5" pipe (as that's what
they
> > had at the scrap yard at $0.15/lb.  It's overkill but cheap!)  The
question
> > is; I want to fit the pipe at a 30 deg angle to a piece of the same
> > diameter.  The OD= 5.5", ID= 5.0", for what it's worth.  There will be
two
> > legs welded at 30* to a vertical support pipe.
> >
> > I've read the article noted above, and the pages leading up to it a
dozen or
> > so times in the last week and think I get the jist of it... damn if it
still
> > doesnt' add up.
> >
> > 1; as I want to attach the branch pipe to the header pipe (as far as I
can
> > tell) without cutting a hole in the (vertical) header pipe, will this
work?
> > or does it only apply to cutting a hole in the header pipe, too? since
3/4
> > of the article is about how to cut the hole in the header, and only 1/4
> > addresses cutting the branch pipe to fit?
> >
> > 2; for a 30* angle the cutback is only ~.75" to the top line and ~1.5"
to
> > the bottom line from the side quarter lines.  That doesn't come anywhere
> > near dimensions of a right triangle with a 5.5" base and 30* opposite
angle
> > = 9.5" side adjacent... What the heck am I missing here?
> >
> > 3; Is this one of those conceptual things that's not even ruffling my
hair?
> > Jeesh! OR, it just occurred to me, am I on the completely wrong section?
> > pleaseandthankyou!
> >
> > Even though the points I & G in the illustration are missing from the
header
> > pipe, it doesn't seem to detract from the directions for the branch
pipe.
> >
> > Kevin Donahoe
> > Flying Pig Forge
> > Morrow, OH
> > flyinpig@go-concepts.com
> >
> >