Thoughts on Cutting this to a Desired Angle

[brittf]

I'm fabricating the plumbing for the cooling system on my 1967 Mustang Fastback build using a Coyote 5.0 engine. I need to take a 90° "J" bend and cut it down to 57°. I need to cut along a radial line towards the center of the bend. The tubing is 1.5" in diameter and the bend radius is one diameter.


What I'm starting with.


Connection I need to make.

Icengineworks has a nice aluminum tubing radial cut board but the smallest tubing it fits is 1.625" and it's very expensive. At my disposal I have a horizontal/vertical band saw; a portaband saw in a Swag Offload stand; a pneumatic cut-off wheel; and a pneumatic body saw. Again, my biggest issue is finding and cutting along a radial line that will give me the degree of bend that I need.

Anybody done this before?

Thank you.


Britt

 

[joe49]

Curve o mark will be easy to use on this.
http://www.homelectrical.com/1224-radius-marker-standard.cot-14782.1.html?gclid=Cj0KEQjw3ZS-BRD1xu3qw8uS2s4BEiQA2bcfM0eIXHxRqJM9uKOrcqlD59Ks0x3HxutC7ulubsScYFEaAtRC8P8HAQ

 

[rsanter]

Take a 33degree pie shape out of the center of the bend and weld it back together.
Or just buy a 60 degree mandrel bent piece

Bob

 

[K13]

Not sure if something like this would work for you or not. Post #13

http://www.jalopyjournal.com/forum/threads/cutting-u-bends.417709/

 

[brittf]

K13

Thank you for the link. Very similar to the tool that Icengineworks sells only homemade. This is the kind of solution I'm looking for. I like how they are using a degree wheel to set the angle. I happen to have one of those from when I rebuilt a Ford 289 20 years ago. I think I'm going to head in this direction.

Thank you again.


Britt

 

[K13]

K13

Thank you for the link. Very similar to the tool that Icengineworks sells only homemade. This is the kind of solution I'm looking for. I like how they are using a degree wheel to set the angle. I happen to have one of those from when I rebuilt a Ford 289 20 years ago. I think I'm going to head in this direction.

Thank you again.


Britt

Glad I could help.

 

[gungatim]

we used to make curve-o-mark stuff where I used to work for just such a situation. try your LWS and see if they are still available. we offshored it all to Asia years ago but it's a consumable product and no real tech to it...the aluminum one is way more expensive but it's the cat's *** if you do alot of pipe fitting. the wraparound product is cheap and works goo...have to check, I've probably still got some excess stock stuffed somewhere if I look.

 

[nonhog]

I made a not so accurate, but worked for me bend cutting tool. Started with the idea on the HAMB and made it work with what I had.
Pivot and sleeve made from a non embossed license plate, some gorilla tape
with the use of my kids protractor and some clear packing tape.

Would get it where I needed and mark with a sharpie. Then over to the band saw.

 

[gmwelder86]

Set a square mark on both ends of the pipe say 2"s from center line of pipe. Measure inside radius and outside radius. Devide by 90 than multply by what ever angle you need. Measure from your marks to the inside and outside radius for degree of turn. Mark two points along the tube and cut with bandsaw. Do this on a regular basis for making custom pipe fittings.

 

[bullnerd]

I have one similar to the hamb one, but I made the center a donut and the tube rotates around it. The whole thing rides in the t slot on my band saw so theres only one slot, but it cuts the tube square.

 

[brittf]

Looking at my original post it only took me eight months to get this done. Procrastination and the need to develop some solutions held me up. Following the link to jalopyjournal.com posted by K13 I made the necessary tooling to set the precise angle necessary - 57 degrees.


Using a cam degree wheel, some 1" diameter aluminum rod, a piece of 16 gauge sheetmetal and a 3/8" bolt I fabricated a tool to accurately measure the necessary angle along the radius of the bend.


The sheetmetal is cut to the diameter of the tubing. It is held in place in a slot cut in the rod with two 6-32 set screws.


The tube is set in place and the angle set for marking.


Using a fine point Sharpie I marked each side of the sheetmetal template. I can cut between the lines to improve my chances of getting the correct angle and cut along the radius.


I jigged it up in my horizontal band saw using the area between the two lines to set the blade and my AngleCube to set the correct 57 degree angle.

]
Here's the tube after the cut.

[
And jigged up to be tack welded.


All welded up and the welds dressed. I added a 90 degree bend rotated at 90 degrees to connect to the engine. I also added a bead for the hose clamp to keep the tube from blowing off under pressure.


And here it is installed.


Another view.

My next task is to fabricate my exhaust system. I plan to make a template for the 2.5" diameter tubing I will be using.

Thank you for viewing.


Britt

 

[K13]

Awesome cool to see it in action. Nice work!

 

[gearhead1]

Good work!

 

[Chicken]

I'll be keeping this one in my knowledge bank, awesome!

 

[sberry]

sawzall,,,, ha

 

[homebuilt burner]

Nice work. I have to remember that one as well.

 

[bullnerd]

Nice, clean work Britt.

 

[chruler]

Very slick. beautifully executed.