GEK Wiki / Stainless sheet steel reduction bells
  • If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • Stop wasting time looking for files and revisions. Connect your Gmail, DriveDropbox, and Slack accounts and in less than 2 minutes, Dokkio will automatically organize all your file attachments. Learn more and claim your free account.

View
 

Stainless sheet steel reduction bells

Page history last edited by jim mason 11 years, 6 months ago

  

As of GEK v2.3, we've upgraded all kits to include a stainless stell reduction bell.   We're making these out of 16awg 304 sheet steel, rolled and welded into the desired cone shape.  We were previously using a cast iron redution bell, cut from a found 3" to 4" plumbing increaser.  While this worked reasonably, we could not vary the dimensions, and thus have wanted to move to a purpose made bell that we can make in any dimension.  Here's what we have now.  The default 3"smD x 6" lgD x 6" tall bell is on the left.  Other ratio variations are shown to the right.

 

 

           

 

 

Making a rolled stainless reduction bell

 

You can make any of the above 3" restriction bell versions using the cut files below.  Later i'll also post these for other restriction sizes, but currently the files only cover 3" restrictions.  You can trace and cut these shapes easily with plasma cutter, torch or sawzall. (Remember to wear a mask with stainless)  Then roll the cut sheet into a cylinder with a slip roller.  Or bang them out with a soft sledge around an appropriately sized forming tube.  Of course welding them together with a stainless welding set up is best, but you can also do it with mild steel rigs.  The weld may detoriate over time, but you are likely to change your mind on design particulars way before that happens.

 

Full res versions of the cut files are available in .pdf and .dxf at the links below.  

3InchReductionBellVariations.pdf

3InchReductionBellVariations.dxf

 

These cones weld to a ring 7.5" in diameter, with an inner diameter of either 6" or 4.5", depending on the cone.  I forgot to include these in the drawing.  Will fix later.  You can make the ring base out of mild steel and weld it to the stainless.  The base of the bell is not in an oxidizing atmosphere, so mild steel is fine.

 

These cones should be used with a tar fence around them.  Tar fences are explained here.

 

 

Comments (1)

Dutch John said

at 11:57 pm on Mar 7, 2009

Jim,

Did you already try the thin walled bell? How does the top, exposed to the highest temperatures, hold?

Perhaps a thick walled, loose collar on top of the cone can deal with the heat. In case of overpulling the thin sheet could heat up to the point of collapsing.

Regards,
DJ

You don't have permission to comment on this page.