velosynth spoke magnet
by EFFALO, published
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Description
secures a magnet to a standard-sized bicycle wheel spoke for detecting speed with a hall effect sensor. the form can be easily modified to accept a range of magnet sizes, but is provided to accept a 3/16" x 1/8" disc magnet (locally available in the US at Harbor Freight tools). we welcome derivatives designed to accept magnetic media of different sizes, please post them here on thingiverse to share.
design process: bit.ly/6mtnVE
more info: velosynth.com
design process: bit.ly/6mtnVE
more info: velosynth.com
Recent Comments
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FWIW, the photo shows a bad mounting location. It's actually better to mount the magnet as close to the hub as possible. This causes the magnet to move past the sensor more slowly. At the rim it's not unusual for the sensor to start missing revolutions at high speeds, so instead of 32 KPH it might read 16 KPH or even 8, or even stop working altogether.
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velosynth spoke magnet by EFFALO is licensed under the Attribution - Non-Commercial - Share Alike license.
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Instructions
print with your makerbot using the gcode or roll your own from the stl. the included gcode is for a .2 infill and takes about 8.8 minutes to fabricate
finish by tearing away the raft. go ahead and drop in the magnet while the plastic is molten, it'll help to hold it in tight (although you may need to add some glue, better check and make sure once it cools down)
drill out the holes for the tensioning bolt with a 3/32" bit
insert the M3 nuts into the holes on the bottom of the form
install the spoke magnet to the wheel
thread the tensioning bolt through both nuts and tighten to achieve a good fit
finish by tearing away the raft. go ahead and drop in the magnet while the plastic is molten, it'll help to hold it in tight (although you may need to add some glue, better check and make sure once it cools down)
drill out the holes for the tensioning bolt with a 3/32" bit
insert the M3 nuts into the holes on the bottom of the form
install the spoke magnet to the wheel
thread the tensioning bolt through both nuts and tighten to achieve a good fit
velosynth spoke magnet by EFFALO is licensed under the Attribution - Non-Commercial - Share Alike license.
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Comments
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FWIW, the photo shows a bad mounting location. It's actually better to mount the magnet as close to the hub as possible. This causes the magnet to move past the sensor more slowly. At the rim it's not unusual for the sensor to start missing revolutions at high speeds, so instead of 32 KPH it might read 16 KPH or even 8, or even stop working altogether.