that depends how much of the bump the tire absorbs but I only compared the hub motor torque vs the normal force of standing on the board with no bumps
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Thatās instantaneous torque though, not persistent. It would be considered an impact load and depending on the material I would magine that would make a difference in the actual perceived effect on the truck
It is pretty hard to track all of the miscellaneous loads though, I would personally probably tend to just throw a bigger fudge factor on to account for impacts
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another big issue I see is it doesnāt appear youāre using a through axle so if the material is aluminum, the truck doesnāt have an endurance limit, so over time, vibrations will lead to failure
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Yeah this is true, a lot of the cast trucks use a through axle, but comparatively the machined material should be stronger than cast because of metal grain.
Youāre still right about vibrations though. The type of aluminum would make a difference a little bit but ultimatey could fail. Vibrations could run the cycles up pretty quickly too
We all know what happened with the aluminum fLExl trucks lol
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I didnāt think of mirroring it, but Iām about to start a mountain board project, so I was planning on doing a new setup with loads on both sides. The mirror option makes much more sense. Thanks for pointing out what should have been obviousā¦ Iāve experienced the frustration of a single motor on my road board, spinning the wheel on heelside turns, so I totally get what youāre saying.
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wouldnāt want this to happen:
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Yeah most of the time I get zero motor spin on my board even on sharp turns because the torque of the other wheel forces the truck down and the other motor compensates
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I love these comments. I should have got this discussion going before I started working on this design!
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Absolutely. Iām totally expecting a fatigue failure at some point, and a bit scared of it to be honest.
Then youād have no experience to bring to the table! Iām glad you started it now, instead of sharing your work months after all had been done 
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I donāt know if this is possible or not, but could you add a weak point to the truck, that would break first (without causing any harm), and be an indicator that it needs replacing?
Thanks all. I have to take my kids down to the park now, for a bit of playtime, but will be back later to read more.
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This looks amazing, Iāve played around with generative design a while ago for our Baja team, but we never implemented due to machine limitations
One questions, is the last version really machinable? Looks like it has some really tight radius
Another tip mor anyone playing with it is use is just as a guide, and use the geometry to make a more traditional design on top that is easily machinable, this way you keep most of the weight savings, use a optimum design for the load case and keep the machining cheap
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I didnāt some time playing with generative design and came up with some interesting channel truck hangers
But never really planned to make them, just experimenting. That said your trucks look awesome. Thatās some nice machining there, wish I had these facilities available to build stuff.
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This looks fucking boss man . Id paint them white and put them on my board . Iāll tell people my trucks are CNCād elephant bones
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Good spotting. The last pic in the series is actually of an outcome for a 3D printing scenario. I guess it could be machined with small enough cutters, but it would be a nightmare.
Good points about using it as a guide. I actually did quite a bit of touch up work on the t-splines body to smooth it out and add some aesthetic details, for the 5 axis version.
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Ha! Thatās hilarious. Cool idea. Or the pelvis of the lesser spotted giant weasel from the depths of the limestone caves in Turkmenistan?
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Wow. Cool. This could actually be an interesting approach for a direct drive setup couldnāt it? House the motors in the channel maybe?
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Cool idea, but Iām not sure you could get enough mass in such a small channel to really get the power most of us are looking for.
Or that would be one huge hangar!
This stuff is really cool, Iām excited to see what comes of it
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