rolling an eccentric cone

[eski1]

Hi
We need to get an eccentric cone rolled with a 75mm diameter one end & 650mm the other end , 600mm tall with an offset of 350mm from 2mm 304 or 316 stainless steel. If you looked at the cone from the side it would look straight one side and angled the other side .
does anyone know who could roll this ( can't be folded )preferable in the UK

Regards
chris

 

[RobWard]

I'd suggest you could try a heating and ventilation company. The sheetmetal workers there, making bespoke ducting, that we use seem to be able to make just that sort of thing all the time, though it would depend on what tolerances you are trying to hold.
I can give you the contact details of our local company, located in Bradford, if it's any use, but I'd imagine there will be many such companies in any given city in the UK.

Rob

"I love deadlines. I love the whooshing noise they make as they go past." Douglas Adams

 

[griffengm]

Might try the manufacturer of such rolling equiptment and see if they have sold a machine to someone near you.

Griffy

 

[MikeHalloran]

Uh, 2mm 316 is not tin; HVAC tools aren't strong enough to work with it.

Look for a company that makes "marine exhaust" parts for yachts.

If you can't find a local source, get in touch with DeAngelo Marine Exhaust in Fort Lauderdale, FL. They will work from drawings or sketches, and ship all over the world.

Phone them at 954-763-3005. Ask for Dave Cook.
Fax them at 954-467-8133.


Mike Halloran
Pembroke Pines, FL, USA

 

[nbucska]

Must the wall thickness be the same ?
I wonder if the EXPLOSIVE FABRICATORS in Louisville,CO
could make it ?


<nbucska@pc33peripherals.com> omit 33 Use subj: ENG-TIPS
Plesae read FAQ240-1032

 

[whippo]

Pretty much any (larger) sheet metal shop could knock up an oblique cone in 2 mm st/st.

A set of 75mm rolls would be able to roll it, although it would be tiring to make a lot of them.

 

[eski1]

hi
thanks for the replies
We have got the job now and have negotiated with the company and will do the oblique cone in 2 halves ( split vertically ) using our brakepress with a radiused top tool and 30 v bottom tool . Cheating i know but we have been told that with the radiused top tool and lots of folds ( need to work out how many yet ) you will not be able to tell the differance
hope it works
Regards
chris

 

[pirko]

You can ask firm which using Swaging technology, may be good idea. Regards Libor

 

[smcadman]

Sheet metal bumping is not very hard once you get the hang of it. I first started bumping with column covers which were fairly easy, and graduated to bumping tail booms for helicopters which got pretty hairy. square to round transitions are another time bumping is used.

To make consistent pieces, make a template of the outside edges that will be bumped by cutting notches with a jigsaw or bandsaw. Make the notches about 1/4" long, and make every 8th or 10th notch 1/2" long. This helps reduce eye fatigue.

Lay the template on your part, spray Dykem blue layout fluid on it, and this will give you lines to hit. Number the long lines so you won't lose track of where you are bumping. You may find that you will have to hit between the lines for smoother parts.

Here is a little more info on bumping:

http://www.thefabricator.com/Bending/Bending_Article.cfm?ID=158

Flores
SW06 SP3.0

 

[griffengm]

There is or was a publication called "Snips" dealing with lightgauge sheet metal fabrication. They had a set of handbooks for layout of virtually any combination of tube, ducts, or cyclones you could dream up. A Google search should turn them up. The handbooks are a good investment if you get into this kind of stuff.

Griffy