In my experience, these type of bolts get installed after something bad occurred. They never solve the root cause, but they are interesting! Thank you for your help! Early Access here http://www.Patreon.com/AvE
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That bolt looks like it's $9000
I’ve seen a video where they had a little paper that tells what colour is how tight it is by percentage
Looks green to me…..
Hypercompressors in the chemical industry have headstuds that have a indicator in them. They install a hydraulic head and stretch the headbolts then measure with a depth indicator to insure the stud is stretched within spec then they screw down the nuts. Release the hydraulic pressure and bam torqued! Brilliant.
Why do you keep talking about these bolts as if they are meant to be used as an indicator that they came loose? That's not their purpose.
What we care about with a bolt or other similar fastener is pre-load, and pre-load is created by stretching the bolt. How far the bolt is stretched corresponds directly to the amount of pre-load- so ideally we want to measure bolt stretch. Since that's not possible in a lot of applications- we substitute torque instead. The problem is that torque isn't very accurate. The lubrication used, the method of tightening, and contamination can all significantly affect the amount of stretch we end up with using a given torque.
These bolts are specifically designed to allow us to directly measure bolt stretch without having to rely on torque. They are meant for applications where precise stretch (and thus pre-load) is required. They are not meant to be indicators that a bolt came loose- and considering the fact that you can more accurately achieve the correct pre-load- they shouldn't come loose in the first place.
In short- these bolts are, in fact, solving the root cause of the problem.
I suppose you use snake-oil as anti-seize for those panacea-bolts?
When I was a wee lad, around 16 at the time, I had just started at a company that mills animal feed as an apprentice fitter. They put these bolts in on the roll plates that held the front end of the press on to stop operators over fastening them when changing the size of the Die ring (on account that if over tightened the M20 bolts would sheer inside the die andnit took around 4 hours to hammer them around to get them out. It still took only 6 weeks for them all to be sheared in half…..
🤔👍
So true the industry specific info in this vid! FFS and RCA come to mind! Ha ha ha. Cool invention, but without colorimetric identification available for these things… they are just expensive bolts lolz! 😆😄😆
Love to see a view of the "Rotobolt" – same general idea, just a cap that spins instead of visual (I think)
Another bit of info not presented in this video by uncle bumblefuck… the washers are over-torque indicators. 200lb gorilla gets on it and the washer pukes its guts
Sucks to be relying on these and being red-green color-blind.
I can see this device potentially saving thousands of lives or potentially killing thousands. It's a tool that needs to be used properly, like any other.
Self sealing steam bolt.
I allready knew terminology concerning bolts is crazy in dutch. (anything with a hexagonal head is a bolt. Everything else is a screw) But now I've learned it sucks in english also, even changing the name according to the use.
Keep going down this road and pretty soon the bolts will have an expiration date.
And, here I was hoping someone had developed a stretch monitor system, you could use from a bolt head. I thought the indicator was just surface flush, and as you torque down the bolt, the indicator would sink in, and then by measuring, the distance it retreated into the bolt, you could measure the bolt stretch. When I build engines, I stud everything critical, and can then measure how far the bolt stretches and know I have proper preload.