need help using wrap-a-round 2 cut 16" pipe

[paintman]

i have the wrap but i cant figure it out im trying to make an elbow out of 16" pipe for a new bbq project

[Tinbasher]

4 things must be known to make a gored elbow:
1) Diameter (known)
2) Number of degrees
3) Number of pieces
4) sweep of the elbow, either heel, centerline or throat radius.


Give the specifics and we'll work through it.

[paintman]

ok you already lost me.what i did is i took a piece of 2" pvc pipe and put it in a miter box and cut it at 45 degrees,flip the 2 pieces around and it makes a perfect elbow.thats what i need to know ,how to cut a 16" pipe at 45 degrees to make an elbow thanks

[prop-doctor]

same way just need a bigger miter box
MOOOORE POWER
A SPEEDY SQUARE --OR PROTRACTOR
at a 45

[paintman]

in laymens terms please

[Tinbasher]

With what do you plan to cut it...do you have a plasma or with a zip disc ??

[Sandy]

If your pipe is 16" OD it'll help to get some reference points laid out. Try and quarter your pipe lineally with some lines. Pick your line to be the inside and mark your point where the inside of the elbow is to be from the base. The line 180º away will contain the reference point for the final outside of the elbow, and that point will be 16" further out from the base than the inside point. The other two lines along the side can then be your 'halfway' points, both at 8" more than the inside point and/or 8" less than the outside point. Your wrap should touch these reference points give or take a little inaccuracy in the layout.

[Tinbasher]

Here's a sketch of what a wrap should look like to make a 45 degree miter on a 16 inch OD pipe. You can make it out of heavy paper or bristol board, like the kids use for school projects.

I marked X as the throat height...you'll have to decide what you want this to be. Note it is symmetrical about line number 9. stretch out would be 50 1/4 " for 16" OD.( Divide into 16 equal spaces ) Once you've established the points, draw in a free hand curve...wrap it around the pipe and mark your cut line...cut it...rotate one half of the pipe 180 degrees and then when mated to the other half it should make a 90 degree elbow

[paintman]

im gonna cut it with a plazma cutter,the wrap i bought for 30 dollars looks nothing like the pictures,imagine explaining this to a child ill upload pics of what i bought and i hope someone can help me thanks for the replys

[clive]

Put a chalk line along your pipe, make it about 2ft. long. Draw out the template that Tinman has drawn, line up the middle line (9) along the chalk line, wrap it around and do a chalk line down the edge. What you'll get if you turn it side profile is a 45o elbow. Or try this, it's exactly the same thing but the printer will do it for you.
http://www.harderwoods.com/pipetempl...&Submit=Submit
Clive

[OldSparks]

Tinbasheers method is more commenly called parrallel line developement. Often used when a reusable wrap may be needed. A quick one off technique is to.....circle and devide your piece into 4 quarters (mark the diameter on a wrap of emory paper, fold twice and crease , rewrap the pipe and mark off at the creases)....use an angle iron to measure back top and bottom in opposite directions....because you are making a 45 degree joint the distance will be 1/2 the o.d. which I believe will equal an even 8"....now the magic part, you'll need an extra pair of hands, hold your wrap-around as shown on your circumference line quarter marks so it gently meets up with the 8" mark on top, use your third and forth hand to steady wrap and mark cut line, repeat in opposite direction on bottom.

[paintman]

tinbassheers can my throat be only 2 inches because the piece of pipe i have is only 18 inches long and are the measurements in your pics the measurements i need how far apart are the lines i have a piece of 18" paper 50.25 inches long thanks

[paintman]

ok heres what i got check out the pics i dont wanna cut it till you all say its all good thanks for all the help

[Tinbasher]

Originally Posted by paintman

ok heres what i got check out the pics i dont wanna cut it till you all say its all good thanks for all the help

Looks about right paintman. I suddenly feel responsible...I hope all goes well. I'm gonna double check those dimensions. It's difficult to tell where it's folded a bit but the center shouldn't be pointed ...should be a smooth curve. Another way...when you wrap the pipe is to hit your sixteen points with a center punch and then draw in the line on the pipe...might be easier

Yes the numbers check out, but if you only have 18 inch piece of pipe then your throat can only be 1 "...you'll will need 1 inch for each half and 16 " for the mitre...total 18 "

[paintman]

man i get it now now i see it now thanks alot for your help this has been driving me crazy for a week,every since i bought that wrap and couldnt figure it out i was going crazy,found out today that wrap wont work for this type of elbow but now after you guys have been talking me through this i get it.i really dont feel stupid caz i never would have figured it out without yall thanks alot

[paintman]

oh and the line is smooth not sharp i just folded the paper so it kinda lookes sharp

[Sandy]

Originally Posted by paintman

ok heres what i got check out the pics i dont wanna cut it till you all say its all good thanks for all the help

That looks pretty darn good. You're going to have to be really carefull with that light weight paper. It'll shift pretty easily. Paint pens work fairly well too. Lots of dots then fill in the dots if it looks good. Acetone them off if it doesn't.

Way to go. It'll work.

[Tinbasher]

Glad to help paintman...let us know how it works out.

[paintman]

well you were right it worked only messed one thing up mypipe was only 18 inches long so i should have made the throat 1 inch i didnt reed the rest of your post in time,but it still will work great thanks again

[paintman]

and the last one