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MCN
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PostPosted: 17:20 - 27 Aug 2018    Post subject: Vibration Reply with quote

https://www.youtube.com/watch?v=IKwWu2w1gGk
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BanditsHigh
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PostPosted: 19:32 - 28 Aug 2018    Post subject: Reply with quote

Interesting Thumbs Up
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Hong Kong Phooey
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PostPosted: 22:59 - 28 Aug 2018    Post subject: Reply with quote

Naw man, you just use the same nuts and bolts that the Junker vibration test machine is made of.
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Dave....
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PostPosted: 23:43 - 28 Aug 2018    Post subject: Reply with quote

Bet they cost a few quid though.
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rpsmith79
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PostPosted: 07:25 - 29 Aug 2018    Post subject: Reply with quote

Dave.... wrote:
Bet they cost a few quid though.


Yep, i have used them before, and they are great, but expensive

They also make a right mess of the mating face you are bolting too (as you can see at the end of the video), so don't use on anything painted or chrome plated etc, as it will chew it up
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MCN
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PostPosted: 17:52 - 29 Aug 2018    Post subject: Reply with quote

rpsmith79 wrote:
Dave.... wrote:
Bet they cost a few quid though.


Yep, i have used them before, and they are great, but expensive

They also make a right mess of the mating face you are bolting too (as you can see at the end of the video), so don't use on anything painted or chrome plated etc, as it will chew it up


Exactly.

This is where the great mysteries of engineering come into it.

There is an engineered solution for every problem.

It's when problems are 'solved' by folk who are not engineers we see problems.

The most common failure in bolting stuff is whether to use lubricant of not.
A lubricant massively increases a fastener's clamping force. Things can be crushed by the extra force exerted even thought the 'correct' torque for the bolt dimension is used.

It is actually Rocket Science.
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RhynoCZ
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PostPosted: 18:39 - 29 Aug 2018    Post subject: Reply with quote

MCN wrote:
The most common failure in bolting stuff is whether to use lubricant of not.
A lubricant massively increases a fastener's clamping force. Things can be crushed by the extra force exerted even thought the 'correct' torque for the bolt dimension is used.


This +1Nm

For most of the things you work with (motorcycles/cars) the manufacturers give you the dry torque values. If you lubricated your bolts, the torque wrench, although set correctly, will allow way more torque before it clicks or the head of the bolt just snaps off before that.

The most common issue is wheel bolts and nuts on cars. Even profesional mechanics lubricate them and then even tighten them with their fancy air guns, which is wrong on its own (not the topic in question).
When you put way too much torque on your wheel bolts/nuts, the bolts/lugs do stretch and may even snap clean off when you brake, accelerate, turn or just go through a pothole. Not to mention the fun you'll have when you're going to need to change the wheel at the roadside.
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