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Réalisation - Bicycle magnetic headlight

  • Etape 1

    Cut two 4cm squares in fine plastic forex or plexiglass and, using a drill, drill the centres with a 4 mm bit.

     

    Pass through the hole of one of the plexiglass/forex square a 3.5 mm bolt and tighten it on the other side with a nut (use a wrenche and a screwdriver).

     

    Pass another nut and the other plastic square leaving a distance of 1.8 cm between the two squares.

     

    Complete with a last nut and tighten the two nuts one against each other (using two wrenches).

     



  • Etape 2

    Wind the copper wire beteween the 2 squares after leaving initially about 10cm free.

     

    Try to do it with some regularity.



  • Etape 3

    Isolate the coil by covering it with transparent sellotape.


  • Etape 4

    Start by connecting a LED at the end of the pair of electrical connectors. Attach the block of connectors to the top hole of the 6 cm iron bar with a nut and an M3 bolt .

     

    Pass the coil's bolt through the 2nd hole from the top of the bar. Pass on the other side a washer and a nut and tighten it firmly with 2 wrenches.

     

    Finish by adding a cap nut.



  • Etape 5

    Melt the varnish covering the copper wire ends of the coil with the flame of a candle.

     

    Scrape of the soot with some sandpaper.

     

    Connect the two wires to the electrical connection block.



  • Etape 6

    Split a piece of hose pipe with a cutter. Surround the "upper arm" of the rear part of a bicycle frame and screw the dynamo support on top.

     

    Drill the reflector with a 1.5 mm bit. Screw the magnet on this hole with a washer between the magnet and the reflector.

     

    Unscrew and release the fixation of the wheel reflector. Slide the reflector between 3 spikes (2 below and one on top). Replace the fixation without tightening. Slide the reflector until it gets stuck and tighten it firmly.



  • Etape 7

    Pass a bolt through the remaining hole of the dynamo support and tighten it with a nut.

     

    Fix the bar with the coil to the dynamo support with a bolt and passing on each side a washer and a nut.

     

    warning Don't tightening too much as the final settings still have to be done later.

     

     



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