Getting it to work
All the parts are assembled and fitted into place (see pictures) on a wooden base and then wired up. If you wire up the 6V battery directly to the two wires of the electromagnet the current that flows will create a magnetic field that will attract the iron hack saw blade. The blade will be attracted to the magnet (the head of the nail) and it will bend towards it. The end of the blade will hit the bell creating a single 'ring' or 'ding'. This will just create a single noise, not a repeating ringing. So we need to use the various metal parts on the demo to create a moving switch that will alternately make-and-break a connection so that the magnet current will oscillate ON and OFF, making the bell striker constantly move back and forth to constantly ring the bell. We make a moving switch using the bolt and hack saw blade. One wire of the battery goes to the bolt using a croc-clip lead. Screw the bolt into the plastic holder just far enough so it touches the hack saw blade and makes electrical connection with it. Connect another croc-clip lead to the far end of the blade (the fixed end) and wire it to one of the electromagnet connections (either one). Finally wire the other electromagnet wire back to the battery to complete the circuit.
3D printed parts
There are three parts that are 3D printed: i) the bell support, ii) electromagnet support and iii) the flexible iron hack saw blade support. Each of the 3D printed parts has bolt holes printed in them. The blade and electromagnet holder parts can be fixed using the four long self tap screws with the screws going in from behind the wooden base. The bell support is secured using self tap screws from above.
saw blade and electro mag holder: ".stl" file ".scad" file ".g" file |
bell support: ".stl" file ".scad" file ".g" file |
electro mag support: ".stl" file ".scad" file ".g" file |
back to 3D page |
THE CREATIVE SCIENCE CENTRE
home | diary | whats on | CSC summary | latest news