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Old 06-09-2011, 11:28 PM   #1
dub c
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Exclamation Rolling Sheet Metal

Question:

I've been trying to find a place locally but it seems not many shops can help me.

Basically I want a reducer:
- ~2-1/2 feet in length
- 4" O.D. to 3" O.D.
- ~16 gauge (for exhaust)
- 304SS (or better)

I know nothing like that exists on the market so I need one custom fabricated, I know it could be done with a bunch of breaks but I really just want it rolled from one sheet with one weld running the entire length.

Does anybody know of any alternatives or has anybody done work like this?

Thanks in advance.

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Old 06-11-2011, 01:45 AM   #2
projectQWKSLVR
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That's gonna be pricey! Having work as a tinsmith an a welder, man that's a hard material (SS) and it doesn't like to be rolled in such a tight radius. Plus the flat cutout sheet would be shaped in such a way that it can't be rolled as one piece. A two piece would look gross and I'm sure would not be ideal for your application.

Hope this helps and good-luck
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Old 06-11-2011, 02:57 AM   #3
TIGWERKS
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I could possibly draw it up in solidworks, laser cut it, form it and then weld it up
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Old 06-11-2011, 03:00 AM   #4
TIGWERKS
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but why so long?
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Old 06-13-2011, 11:04 AM   #5
dub c
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I don't think solidworks and laser cutting is entirely necessary.
I think drawing it on a piece of 16ga sheet with a permanent marker then using cutters is the quickest and cheapest method.
9.425" one end, 12.566" the other end, 32.5" apart (32.5" long reducer, I believe that is the length I'm after).

Forming will be the tricky part. Do you have rollers that go that small or would you do it by hand?
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Old 06-15-2011, 01:22 PM   #6
imhuge
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I would look into a ducting supplier instead of a fab shop. Check out Air Handling Systems. They make stainless manifolds. You would just want a trunk without branches. I expect that they can do that all day long.

Air Handling Systems Manifold Catalog
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Old 06-15-2011, 05:26 PM   #7
dub c
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Thanks for the link!

I emailed them and the longest they can do is 8" without any breaks is.
I really just wanted one seam running the entire length.
Also they strictly only deal with 20ga. 304 2B SS.

I just can't believe I can't find anybody that can do this, I originally thought it would be a simple thing that any shop/fabricator could do.


TIGWERKS... PM me back!
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Old 06-15-2011, 06:43 PM   #8
TIGWERKS
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busy busy.....i dont see why it needs to be 16g either.........you can do 18g just fine. having it laser cut would make it far nicer then trying to cut straight with some shears or some other random tool for over 2ft on 2 cuts. Doing it in solidworks then flattening out the cone and getting that flat sheet laser cut would ensure a perfect piece.

I wouldnt deal with trying to make 2 straight cuts and not have it come out how i wanted it to. Id rather spend a little extra money to ensure it comes out nice.

Why dont you just cut down an off the shelf cone or use a cone thats close to that size/length. I dont get why it needs to be so long.
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Old 06-15-2011, 09:21 PM   #9
thefoos
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unless I'm misunderstanding, why don't you just get a megaphone?....

http://www.mandrel-bends.com/catalog...-16g-1543.html
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Old 06-15-2011, 10:24 PM   #10
dub c
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TIGWERKS.
Sorry, didn't mean to hassle you. Haha
It doesn't need to be 16ga. I added the ~ in front because I wanted something in that range, 20ga would work fine I think.
I see, that does make sense to use a CNC.
Its the rear section of my axel-back, I want it to start just after the last bend in the exhaust.

thefoos.
Ah I didn't realize companies made those. It is basically what I'm after. But they don't have anything from 3" to 4" O.D. So by the time I cut the ends off to match 3" and 4" the megaphone will be quite short.
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Old 06-15-2011, 10:50 PM   #11
puggsley
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Try http://www.burnsstainless.com/ they may be able to help.
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Old 06-20-2011, 03:57 PM   #12
dub c
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I forget who suggested it but Cone Engineering ended up having what I needed.
Ordered a 3" in / 4" out cone today. (24" length, 18ga, 304SS)

www.coneeng.com
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