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Old Jan 14, 2013, 06:49 PM
PeterVRC is online now
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Australia, VIC, Melbourne
Joined Nov 2006
13,934 Posts
32 Euro....
Uses dual magnets...
I made my own, pretty much the same as that.
Use rare earth magnets ($1) some wood ($1) and a normal prop balancer - for the shaft and cones ($4)....

But... any cone system is fraught with error, and very few (if any) make decent enough cones and shaft to be truly accurate. Magnets bearings mean the system has zero friction effectively, so any error (outside of the fan) shows up notably. eg imperfect drilled and tapped cones, or slightest bend in a shaft - or not even seated correctly in the fan by yourself.

So better is to use the exact shaft of the actual fan, for the pivot. eg 6mm... 8mm.... but then you need to add 'points' the their end - which needs care to do accurately too! (spin a shaft in an electric drill against an electric grinding wheel, or device - erases 'centralising error', so you can make highly accurate points yourself).

32 euro.... or get a Hobbyking US$10 one...
The cones are the shortfall in most of these mass produced things.
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