Is there a tool to do this?

[9 LIVES]

Im trying to figure out how he does it? I would really like to be able to duplicate this. He some how makes his own 8" to 5" reducer? What type of machine would take a flat sheet of steel and mold it into a cone shape?

I hope this photo shows up below?
You can see on the bottom of the stack where it goes from 8" stack down to 5". I have been building 5" exhaust stacks along with 6 & 7" but have yet to be able to do the 8" he does due to the sheer size of the reducer needed.

[9 LIVES]

I forgot to mention that the standard size of exhaust for the Y pipes & elbow that you can see in the pickup bed is 5" pipe.

[TEK]

Take a looky at this......

http://www.i-logic.com/conecalc.htm

[9 LIVES]

That's a pretty neat tool. Now im just trying to figure out which dimension A & B etc. are.....seems handy!

[9 LIVES]

That's a great tool. Im trying to figure out this cone dimensions if 5" pipe is around 15.5" (?)around & 8" pipe is 29" around I tried typing in those dimensions and it gave me a bogus cone.

Is that template in inches?

[Brianstick]

Make a template out of paper first. When you get it the way you like it, then cut it out of steel. Paper is cheap, steel is not.

[usmcpop]

Here's another:

http://www.sheetmetalguy.com/cones.htm

Or do it manually: http://search.sheetmetalworld.com/news/articles/198.cfm

[Zrexxer]

That's a great tool. Im trying to figure out this cone dimensions if 5" pipe is around 15.5" (?)around & 8" pipe is 29" around I tried typing in those dimensions and it gave me a bogus cone.

Is that template in inches?

The model says diameter A and diameter B... not circumference.

[9 LIVES]

Gotcha...brain fart eh
slow day for us lower edumicated folks

[9 LIVES]

Does not seem to be that accurate. I typed in 5 & 8 for the diameter. Traced the pattern onto white construction paper. Taped it togather and measure my cone it was 4" X 7-1/4

[9 LIVES]

http://www.i-logic.com/conecalc.htm

Is this formula in inches? I have spent the last 2 days cutting out templates yet to find what #'s to punch in a funnel that is 8" at the bottom and 5" at the top. Seems simple but when you type those figure in the bare spaces it give you a funnel that is 3" at the top and 7" on the bottom.

[Mr Jimi]

Take your pipes to your local sheet metal shop with a dozen donuts in the morning and ask then for a hand
Jim

[usmcpop]

Maybe this will make more sense.



In that cone calculator, are you entering diameter A as 8, diameter B as 5 and some nominal number for the height, say 6 inches and then clearing the default angle setting (make it blank)?

[Some Creep]

http://www.i-logic.com/conecalc.htm

Is this formula in inches? I have spent the last 2 days cutting out templates yet to find what #'s to punch in a funnel that is 8" at the bottom and 5" at the top. Seems simple but when you type those figure in the bare spaces it give you a funnel that is 3" at the top and 7" on the bottom.

Looking at the picture on the calc page, it shows there's a section above and below the produced cone as 'extra trim stock'. Make sure it's blank. The diameters you are measuring would be narrower at the top and wider at the bottom to account for this. Measure off your correct height to double check this is the case.

Just an observation.....

[dsculpin]

You can do it on a metal lathe and not have a seem. This is a pretty simple spinning operation. You could actually probably get away doing it on a wood lathe. Here is a short little video of a guy spinning a piece:

http://www.youtube.com/watch?v=DGszB...eature=related