And your resolution suggestion is?
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Fuck it dude that sucks.
Not that you should be supposed to modify parts to make them safe but Iâd grind a flat âspotâ/âpocketâ same as the left one.
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Hilarious that I canât get an email replyâŚexcept if itâs on the forum. Watch out homies, these need a renovation before they are safe.
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Oh damn⌠Iâm just seeing this now. Itâs a steel dowel glued into the hole?
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Replace it of course. (That is if he can trust me.)
Version two will be heat shrink in (no glue) and a set screw retainer.
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Genuinely curious why change from a standard kingpin?
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No I canât, unless these are done properly. Up to you now
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From a machining perspective, machining that cutout for a kingpin head increases cost.
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When did you send an email, I donât believe I received one?
Requires additional machining
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I think itâs worth itđŹ
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Itâs true, and in all honesty the math says it will always work 100% of the time, with a very very large safety factor. This is a failure in QC and not in design.
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Thatâs the same compound people use for affixing motor pulleys right? I was recently brushing a thread where people shared their experience. Seems like itâs really solid until it isnât. May be strong enough to withstand the 19,000 when itâs fresh but maybe not so much after the fatigues from repeatedly riding. Just a thought
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So increase cost. Hospitals are pricey
Unfortunately, they dont give numbers of glue joints that fail through fatigue, and thatâs how glue joints fail most of the time. Iirc only adhesion strength numbers are given? Perhaps you can look into a inteference fit coupled with adhesives.
Still, many wonât trust a non mechanical way of securing a kingpin, considering that this pin is what is basically connecting your entire drive system to your deck. Asking them to trust a glue joint is a tall order, even if all the math in the world proves otherwise.
Itâs very much like set screws in the esk8 community. Itâs a well established mounting mechanism in the engineering world, yet, even with a good design, there are still many in this community that tend to stay away from it simply because of past experience with early implementations of motor mounts using set screws. Itâs not the set screw at fault, itâs mostly attributed to design error and quite often, coupled with user error.
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@boardnamics Iâm not saying the adhesive characteristics combined with the press fit canât handle it. That very may well be the case. Thank you for providing the data on the adhesive that supported the design choice. And I expect with such tolerances, the amount of adhesive would be very minimal and not easy to see when the part was removed.
Itâs a design choice that definitely sits apart from the majority of Baseplates. But that doesnât mean itâs wrong or canât work. The community should give feedback constructively and not jump to conclusions here.
I personally think a through bolt is an easier choice. Itâs a straight through hole for the CNC. The hardware is easily sourced and user replaceable to change length. The tolerances are less important as they are interacting with the inside of the bushings which are slightly undersized to begin with. I think as long as diameter is within reason, the primary duty of the kingpin is to just be rigid. A hardware store grade 8 bolt can accomplish this if placed in the right pocket
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Agreed. From a chemical standpoint, some of those characteristics can change when you add heat. If they needed some heat for press fit that could alter the glue characteristics. Could
Edit: the spec sheet supports heated implementation for hot cold press fit 
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Yeap. Which makes it really hard to implement, but hey, if it works, it works! Iâd still prefer a mechanical way of checking if my kingpin is close to failure though.
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Couldnât agree more, glad youâre alright though!
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