[TheForge] pipefitting question

Tue Nov 4 08:44:01 2003

Get a piece of oaktag (thin Cardboard). Wrap around one pipe, tape so it 
forms a sliding cylinder. Aim at other pipe, at angle wanted. measure gaps 
so that the area touching needs the amount of gap 180 deg. away removed. 
you can use a piece of angle iron laid on the pipe to draw lines to help 
get your measurements.
Any idea what I mean yet?
If you muck it up turn oaktag around and start over. When the oak tag fits 
this is your outside profile. the actual cut is aimed at the side 180 deg 
opposite
L Brown

At 08:22 PM 11/3/2003 -0500, you wrote:
>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
>[email protected]
>
>
>_______________________________________________
>http://mailman.qth.net/mailman/listinfo/theforge
>theforge mail list group photo site is
>http://www.photoaccess.com
>Login:  [email protected]
>password:  anvil
>___________