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  1. #1
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,847

    Default Retention basin outlet fittings

    These parts go on a concrete outlet structure. I didn't design it, just working off not so great prints. Some guess work involved. I'll post new pics as I go. First pc. is a cone shaped pc. for the bottom drain hole. 304 ss. Started with 1/8" sheet. Layed out & cut two halves, then bumped to shape. Tacked together. You can see the lines I drew for bumping, about 1" apart on large end. you can make the cone smoother or not by bumping closer/farther apart. Cone is 12"h x 9"lrg end x 3"sm end.

    0205041406.jpg
    0205041516.jpg
    0205041538.jpg
    0205041558.jpg

    I still need to cap off the large end & add an inlet box to the side. Then it gets welded to a mounting plate that bolts to the concrete structure.
    Last edited by MMW; 02-07-2014 at 06:48 AM.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  2. #2
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,847

    Default

    A few more pics. Added the side inlet & capped the front of the cone. Just need to weld the mounting plate to it.

    0207041744.jpg
    0207041745.jpg
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  3. #3
    Join Date
    Nov 2013
    Posts
    24

    Default

    Quote Originally Posted by MMW View Post
    Started with 1/8" sheet. Layed out & cut two halves, then bumped to shape. Tacked together. You can see the lines I drew for bumping, about 1" apart on large end. you can make the cone smoother or not by bumping closer/farther apart.
    I've got a question - I just do backyard stuff and it's always just square cut stuff. I've always wanted to be able to make shapes from sheet. I don't understand what you mean by "bumping" and I'd love to know if it's easy to form shapes like this - how do you do it? Because there are a bunch of uses I could have for cones, funnels, semicircles, spheres, hemispheres, whatever.

  4. #4
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,847

    Default

    Bumping is a term used for making a shape (such as a radius) by bending it in several places. If you look at my second pic you will see numerous lines on the pcs. Each line represents a bend. I did these on a small brake in my press. The lines would all intersect at one point which would be the theoretical point of the cone.

    To make a complete circle/cylinder you need 360 degrees. Each half would then be 180 degrees. I have 12 bend lines on each half. So I bent the pc. on each line approximately 15 degrees. 12 bends at 15 degrees = 180 degrees.

    If I made more bend lines closer together then more bends of less degrees equals a smoother pc. Likewise if I only used 4 bends per pc. it would look like an octagon instead of a circle. Most times I do this it is just a judgment on my part as to how smooth I want it. I just happened to get 12 lines on this because I spaced the lines about 1 inch apart on the large end.

    I don't have time right now to explain how I lay out a cone, maybe another day. I'm sure if you search on the internet you can find a tutorial on it.
    Last edited by MMW; 02-08-2014 at 06:14 AM.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  5. #5
    Join Date
    Jun 2009
    Location
    las vegas
    Posts
    227

    Default Retention basin outlet fittings

    Looks great. Bumping is used when you have thicker sheets of metal or no roller. But as posted look it up
    Syncrowave 250
    Millermatic 210
    dialarc 250
    spectrum 375x
    trailblazer 302
    Lincoln 135

  6. #6
    Join Date
    Nov 2013
    Posts
    24

    Default

    Thanks guys. I did a search and seems a press would come in handy. Unfortunately I don't have one yet so I'll have to wait. A few people use home made jigs and hammers to bump shapes, but I doubt my residential neighbours would appreciate the noise. Once I get some spare time I might think about expanding my workshop with rollers or a press, maybe home made.

  7. #7
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,704

    Default

    MMW, I'm very impressed, Its nice to see a true craftsmen.

    The only problem with the press brake that I use in my hydraulic press is hitting every line the same amount to make a consistent circle.

    I just picked up a 52" hand roller with 4" OD rolls, I think I would still use a press break for a small funnel like that.

  8. #8
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,847

    Default

    Wow a 52" hand roller? I wonder what thickness you can do? I have a 36" powered roll but with 4" rolls I wouldn't be able to get the small end of the cone. Besides small cones like this are tough to get them to roll correctly. When rolling a cone you have to get it to rotate as it goes through so the rolls are always parallel with the center lines.

    Even if your bumping is slightly off once the cone is tacked you can hammer it around to get it to even out.
    Last edited by MMW; 02-10-2014 at 06:26 PM.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  9. #9

    Default

    MMW,

    Pretty work.

    A couple years back I built something for an up grade / expansion of a local water treatment plant that had a SS conical section (reducer) in it. All though the cone came to me premade it was made the same way you built yours. Who ever built it definetly knew what they were doing and had some good equipment to do it with because it was a really smooth job of bumping a radius into two pieces of 1/4" flat plate.


    SS Diffuser Completion 011.jpg
    Will Argue for Beer (any issue, either side)

  10. #10
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,847

    Default

    Finished up the rest of the items for this job. 1/2" aluminum plate with hole, 1/2" aluminum weir plate with grating, trash rack (grating with mounts) & locking bar for existing top grating. Everything gets mounted to a concrete outlet structure (drain for retention pond). The trash rack was built in two sections as it is 161" long x 48" wide. The angles bolt to the concrete & the bar grating bolts to the angles. They need access to clean it out once in awhile.

    0211041225.jpg
    0211041224a.jpg
    0211041648.jpg
    0213041513.jpg
    0213041513a.jpg
    Last edited by MMW; 02-14-2014 at 03:50 PM.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

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