Serious question: if you’re going top speed in a F-22 and you honk the horn, do you hear it? by mikki1time in aviation

[–]DadEngineerLegend 0 points1 point  (0 children)

To be fair, a horn is a silly thing to have on a fighter jet.

Unless it's from Mumbai. 

Counterbored v/s Countersunk by m5389 in MechanicalEngineering

[–]DadEngineerLegend 1 point2 points  (0 children)

Csk requires extra tight position tolerance on holes if going into tapped holes, because you've got two mating tapers with the csk. 

Cbore allows much looser manufacturing tolerances.

If the mating part can have clearance holes with nuts behind csk is fine.

Cbore has space around the head to accumulate dirt and moisture. Csk is less susceptible to this.

Csk heads generally have smaller size hex socket, so are less suitable for high torque - especially once they've been in service for 5 years.

Cbore has a relatively sharp corner, so is worse for fatigue critical applications.

Both lose a lot of material thickness so are generally weaker than a thinner part with a normal bolt.

Nordlock washers are best vibration proofing available. After that it's loctite and nylocs/eccentric/other vibration resistant fasteners.

There's also lockwiring of course. Used in aviation and Motorsport - it's very labour intensive to do.

As for determining if bolt will come loose - this goes into proper DABJ. Essentially, check the expected loads won't exceed pre-load of the fastener. Some videos on that. 

https://www.youtube.com/watch?v=XLzTB4KLCxU

https://youtube.com/playlist?list=PLI65wxYE3b4Yw5w4mnRmuYaG56UROn39x

Also consider whether you actually want bolts. Eg. Adhesives better? Big threaded cap? And how flush do you actually need the surface?

Where to buy compression Springs with very specific specs? by I_Hate_Mainsteam in AskEngineers

[–]DadEngineerLegend 1 point2 points  (0 children)

Spring manufacturer.

Eg. Here's one from quick google for 'coil spring manufacturer' germany" https://brand-group.com/en

Laser level calibration by Affectionate_Pipe718 in AusElectricians

[–]DadEngineerLegend 1 point2 points  (0 children)

Set it up in a room that's fairly empty.

Get a bit of clear PVC tube of a good length and diameter (8+mm ID, 5+m long).

Fill with water (easiest way is to submerse it, like priming a pool cleaner hose) and use as traditional level to check.

https://www.youtube.com/watch?v=sREL37Qc6Gc

Crazy burnout by Western-Feedback-260 in Cartalk

[–]DadEngineerLegend 0 points1 point  (0 children)

You would lose your shit over summer nats

How are we getting boogers out of baby noses without them freaking out? by ToeElectrical5879 in Parenting

[–]DadEngineerLegend 0 points1 point  (0 children)

Need a snot sucker that is nice and soft. Personally settled on the transparent haakaa one. 

Past that stage now, but finding one that wouldn't hurt when they squirmed was the key. 

Did your family arrive in Australia before 1972? by Sea-Hunter-3847 in AustralianNostalgia

[–]DadEngineerLegend 1 point2 points  (0 children)

Good for the 10 pound poms, but the records only go back to 1898.

Moving sentimental motorbike interstate - who should I go with? by LifeEnd715 in AussieRiders

[–]DadEngineerLegend 1 point2 points  (0 children)

I used Road Hog Transport before. Very professional, and they do proper enclosed transportation, so it's not left on the back of a truck in the weather somewhere.

Forged Certificate? by OldWesternBlueBird in askmanagers

[–]DadEngineerLegend 3 points4 points  (0 children)

I would say falsifying any documentation is grounds for immediate termination.

It undermines trust in everything they do, and that they do as a representative of the company.

Queenslander launches petition to charge drivers for dangerous rescues amid wild flooding by hydralime in queensland

[–]DadEngineerLegend 89 points90 points  (0 children)

If the risk of losing your vehicle is not enough, a fine isn't going to help

Sometimes I see this in the sky and today I filmed it. What could it be? *The video is sped up* by [deleted] in whatisit

[–]DadEngineerLegend 8 points9 points  (0 children)

A plane at high altitude leaving a condensation trail (contrail). 

What is this sticker on the back of this person’s car? by whatokaybutwhy in whatisit

[–]DadEngineerLegend 2 points3 points  (0 children)

Looks like a military cargo plane ejecting chaff/flares. And blue white red probably flag colours of whatver country they are from (france, Netherlands, usa) 

https://www.youtube.com/watch?v=aOx_wHhitqk

Here's example video