DIY wheel and sleeve casting

Same here. They only loosened from my diy hub motor one time after I exaggerated it. They literally melted off when motor temperature exceeded 90 degrees celsius without me noticing that :see_no_evil:
Apart from that, no defects at all but i donā€™t drive them very often either

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Give my 2 cents here since Iā€™m regularly working with PU, for PU to bond well to aluminum you need really good surface prep and cleaning (sandblasting and acetone for example) and a primer that will attack the aluminums oxide layer and protect it until casting, Iā€™ve used OP9018 from electrolube with some success but some others might be better for aluminum.

Iā€™ll actually try to cast on top of a regular urethane wheel, not alluminium. Donā€™t know how well my cast PU will bond to the wheelā€™s PU so thatā€™s why I was thinking about drilling holes on the wheel. That way the cast PU has something to flow into and lock in place. Iā€™ll do some experimenting first to see if they are really needed though.

Hereā€™s a cross section of the mold iā€™m designing. The yellow mesh on the inside is a scan of my 83mm wheels. Iā€™ll tighten it in the mold with a bolt and nuts


Donā€™t know if any of this will actually work, iā€™m just having some fun.

Little update on my wheel extension experiment.

The 3d printed mold worked great. But even though i put a layer of vaseline on it the wheel just wouldnā€™t come off so i had to destroy the mold. (Since it canā€™t be reused iā€™ll redesign the mold so it uses less material and is easier to destroy).

My first try casting the PU looked really good until I got tore apart the mold and the bottom was uncured.

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Donā€™t know what happened here. Maybe on the first mixing batch I got the proportions wrong or mixed poorly but I did exactly the same thing on my second attempt and it came out great!

This 70A PU has a really short working time of 40 seconds. Really hard to work with but it was some of the only PU I could find here in Brazil.

And since I botched the first one and wasted some PU on some tests I donā€™t think I have enough left for three more wheels, but can cast another one for sure. Then Iā€™ll ride them and see how they feel.

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