A useful metal-working technique

Discussion in 'Painting, Welding, Bending and Gas Tanks' started by bluegoatwoods, Jan 20, 2014.

  1. bluegoatwoods

    bluegoatwoods Well-Known Member

    I've just about perfected a way of making good, stout brackets for mounting to frame tubes, chainstays, etc.

    I can imagine a number of uses for fastening stuff to the bike. Cargo racks, cable & wire mounts, stuff like that. Here's an example.
    finished bracket.jpg
    I started with a caliper to measure the diameter of the tube with reasonable accuracy. In the example below one of the tubes was 43 millimeters across. After a bit of experimentation, I decided that the length of the arc I was going to make should be 2.2 times the diameter. So in this case I needed 43mm X 2.2 = about 94 mm. But you need more for the 'ears'. About 25 mm each works well. So you need 94 + (25 X 2)= about 145 mm total.

    Now find something round and tough that measures 43mm across.

    Sockets work well
    bracket step 01.jpg
    bracket step 02.jpg
    bracket step 03.jpg
    bracket step 04.jpg

    I wouldn't drill the holes you need for mounting until after the bending. Those spots are liable to be a bit weak and might bend there instead of where you want it to.
    mikedabomb, Fabian and cpuaid like this.

  2. james65

    james65 Member

    Good tip! Thanks
    Fabian and bluegoatwoods like this.
  3. cpuaid

    cpuaid Member

    Really good tips. I never would've thought about using a socket to bend metal like that.
    Fabian and bluegoatwoods like this.
  4. Zen builder

    Zen builder Member

    I agree with cpuaid, I never would have thought about a socket for a jig. Good idea
  5. darwin

    darwin Well-Known Member

    That snout on your vise Blue is made for that, lil heat helps doesn't have to be red hot. In the ole days they called that blacksmithin.