Building a Suspension Fork Impact Tester for Science

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I bought a real cheap air fork that shows some promise-for the Kent Trouvaille of course. In our quest to upgrade this bike with the cheapest most effective parts, we need to step up our testing a bit. This is the reason why I'm going through all this trouble to build an impact tester.
Sure, the tester is a guillotine combined with a kettlebell, but with a little tweaking it could deliver better results.
In the future, we can add other jigs to the smeasher to fit other mountain bike parts in, and quite possibly parts we make here. You'll also find out next month where I'll be keeping this thing...
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Опубликовано:

13 сен 2022

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Комментарии : 796

@quincybuickerood3070 Год назад

You need something to guide the weight down. This will make it so the weight hits exactly in the same spot each time, not just a similar spot.

@michellesharpe6159 Год назад

So, you've made a bike fork guillotine. Love it!

@nilz6432 Год назад

To actually use this as a tester, it needs to be significantly stiffer than the object you are testing. The Wooden platform that you mounted your clamps to will flex and dissipate a lot of the energy, allowing the Forks to experience less Load. Also the Weight needs to hit at the same place every Time, and the Forks sould be stopped from rotating. I could continue with this, but as far as fun and entertainment is concerned, the smeasher works perfect.

@yakwabbit Год назад

As an engineer, I appreciate the the term; 'moment' of truth. Perhaps that should have been the name for this device?

@curt13g Год назад

Love the video. R&D Engineer here, if you put the fork at the top and tie a rope between the weight and axle then drop the weight, that would result in much higher consistancy in the experimental results and eliminate a lot of the variability in the impact. Could also throw in a strain gauge on the rope to get measuments of how much force is being applied and change the length of the axle/weight rope to alter the force beeing applied.

@daviddoornenbal44 Год назад

I used to have that exact same fork on my bike, but it broke after like 5 months of taking heavy flat drop hits from 2 meters and a few jumps.

@mtbrwannabe5484 Год назад

I have been watching you from 10k subs. There is still nothing more exciting for me, than to see “Seth’s bike hacks” has posted a video. I had just started to ride a bike again for some fitness, I found your channel, was totally inspired to push myself harder and faster. Then spent a large amount of money on my new whip, you showed me I can fix it myself. Heartfelt thank you for your abundance of inspiration you share all over the world, every time you post a video. Carry my love and strength with you at all times ❤️🤘.

@eddmorrell90 Год назад

If you ever get tired of riding with Seth, you can smeash things with Seth! Great video 👍

@AntiDEDok Год назад

just great idea, that definitely needs some upgrades. you totally got our respect because you mentioned problems with that version

@amechanicalengineer4088 Год назад

It's a good idea and an interesting route to take the channel! I will say, as a testing engineer, some of the design decisions were hard to sit with. I'm glad to hear there are some future revisions coming for the smasher

@tslaforest Год назад

Thanks for the science lesson! Nice to see other people push the limits of parts. Maybe a frame stress test is next?

@bladesageproductions326 Год назад

Love the video maybe you could make a budget guide rail by rigging up some brake cable vertically on both sides of the weight and attaching the weight to it with small carabiners or eyelet bolts or attaching some short pipe to the weight to guide it

@whitmankwok1034 Год назад

Just finished our 3rd helmet impact test rig at KAV and we learn something new each time.

@Marvthegrate Год назад

I particularly love the look on Oscar's face at

@MTB_Rider_96 Год назад

Wow, Excellent job on this. I work in an ASTM/ISO professional test lab, and you did a great job on this.

@amiramz Год назад

so i just remembered i noticed on several of your vids you were wearing a Winder Towing tshirt... just imagine how cool a colab vid with Matts off-rod recovery could be :) just putting it here... awesome vid! thanks bro

@mdturbo764 Год назад

"Honey! Look what I built! Its a guillotine but with a weight instead of a blade so its only 2/3 as dangerous and so it will be perfect for our kid! Their gonna love it! - Seth's final words before death by wife using his own creation "The Smeashotine"

@WestCoastMountainBiker Год назад

I think the weight should have a flat bottom. That might already make a difference in the way the impact treats the fork as well as how the deflection will be if any.