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  1. #1
    Join Date
    Jul 2009
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    Default Dirt Bike Bracket Pattern Making

    Dirt bikes are constantly taking dirt samples.
    Every time they bite the dirt something gets bent.
    Most of the time it is number plate brackets.
    The owner dusts himself off and bends the bracket back to its original shape.
    After a few sessions fatigue tells the owner it is time to say hi to their local welder.

    Ji
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  2. #2
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    When the bracket brakes it is always lost so it is difficult to know exactly what was there.
    If your lucky you will know someone with a similar model that does not mind you getting some dimensions of the original.

    First I mark up the corners or edges.
    Then I place some photocopy paper over the top and just rub it with my fingers.
    Don't wash your hands as the dirt makes it easy to see all the edges and folds.
    Once there is a rough out line I start cutting the paper down to size.

    Ji
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  3. #3
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    Then I place the cut out over some more photocopy paper and trace all the edges and folds. I add in the turn down flanges and curved section.
    To draw the curved area I just use a washer.
    Once the drawing is complete I photocopy it and cut out the pattern.
    Fold down all the edges and place over the original bracket.
    If all has gone well "I hope" it should fit perfectly.
    There will be small differences when the folding starts but at this stage at least you have something to go off.

    Very happy with the new pattern.
    The reason I don't use the original cut out is because I like to keep a pattern in the draw for next time.

    Now the pattern can be glued to a steel plate for fabrication.

    Ji
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  4. #4
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    Life is a bit easier when you have a pattern and certainly faster when you don't have to think.

    Ji
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  5. #5
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    Default

    Fold on the dotted line.

    Ji
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  6. #6
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    To make the double fold I needed to cut out the overlap.
    Then the last fold and hey presto ready for a test fit.
    Very happy.

    Ready for the TIG.

    Ji
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  7. #7
    Join Date
    Apr 2010
    Location
    Jackson, MS
    Posts
    79

    Default

    Dude, it's not exactly the same. Terrible job. Kidding. Skills, man.
    MillerMatic 252
    Spoolmate 200
    Diversion 165
    Spectrum 625 X-Treme
    Dayton 6" Miter Band Saw
    Delta Drill Press
    Bosch 10" Table Saw
    Bosch 12" Double Bevel Miter Saw
    Jet 5 Ton Chain Hoist
    Radnor O/A

    and this heavy duty table I made


  8. #8
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    Australia
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    Drill hole and clamp on the backing nut.
    These bikes had square shaped backing nuts not hex.

    Ji
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  9. #9
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    I then TIG welded up the over lap areas I cut out.

    Ji
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  10. #10
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    Australia
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    I then wire brushed the bracket and test fit the M6 screw.
    Looks pretty good certainly as good as the factory job.

    I now have to make a jig to hold it in place on the frame and it can be welded on.

    Ji
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    Grip it and Rip it

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