HUB-ee Mechanicals

For information on fixing, taking apart, bolting on and modifying...

  • User Guide(PDF) - This has all the most useful stuff
  • Assembly Guide (Alpha Version) If you want to take it apart, start on the last page and work backwards!

Attaching HUB-ee wheels to other things

Each wheel has a pair of metal threaded inserts inside so you can bolt it onto things securely; these will either have a metric M3 thread, or an imperial 4/40 thread, depending on the one you bought. These can be removed and replaced if you want. The bolt holes are also designed to accept the tip of a LEGO axle so you can incorporate it into your favourite LEGO creations.

The threaded inserts are 8mm long and sit in the centre of the wheel, that means that any screw you use has to go in 6mm deep before it will engage with the thread – for example, if you want to bolt the wheel to a 3mm thick piece of plastic then you are going to need a screw that is around 12mm long.

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Take care when bolting the wheel – try not to over tighten the screws – the current design is not quite as strong as we wanted where the inserts are so if you over tighten the screws you can cause some minor damage to the insides – fortunately not enough to stop the wheel working!

Each wheel also comes with a handy right angle bracket designed to make it easy to attach to a flat chassis – ok, we lied a bit, the bracket is *almost* right angle (actually 89 degrees) thanks to the requirement for it to come out of the mould easily. It has a pair of slots so you can put bolts inside and have something to screw a screw into, these slots will take a metric M3 bolt, or a small 4/40 bolt (Some 4/40 bolts are too large)

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The screws that go in at the top, through the nuts (see pic above), will press up against the screws that bolt the bracket to the wheel if they go in too far.

As an alternative mounting solution for people who prefer imperial screws you can always try this metal bracket from Sparkfun - which comes from here.

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