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Step 3Build the magnet bracket
Next I built the magnet bracket that attaches to the toothed belt. This was so I could then work out what height the stepper motor and pulleys needs to be mounted in the box. I cut two small pieces of aluminium angle. One of the pieces was been shaped to allow it to securely clamp the belt, yet still smoothly pass over a pulley. The other was cut into a small square.
I then drilled through them both, and used a small bolt and nut to clamp them to the belt.
Next I epoxyed a chunk of strong (neodymium?) magnet broken from a larger flat magnet pulled out of an old hard drive.
I stuck some felt on top of the magnet as a low friction surface.
A note here: you need to use a non-ferrous metal for the bracket otherwise it will cause problems with the magnets - e.g. it will get stuck somewhere, or worse will affect the magnetic field and make the magnet seem weaker.
I then drilled through them both, and used a small bolt and nut to clamp them to the belt.
Next I epoxyed a chunk of strong (neodymium?) magnet broken from a larger flat magnet pulled out of an old hard drive.
I stuck some felt on top of the magnet as a low friction surface.
A note here: you need to use a non-ferrous metal for the bracket otherwise it will cause problems with the magnets - e.g. it will get stuck somewhere, or worse will affect the magnetic field and make the magnet seem weaker.
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