Thermal Expansion: The Ball and Ring #physics

#science #didyouknow #thermal #purdue #metal #heat #demo

[jjshow]

Machine shops use dry ice to set massive steel pins.

[eddiemanuelitonavarro]

That study open up for the metalurgical research study that gave us advancement about metal characteristics that are very important in many science and engineering

[Screw_This]

He missed an opportunity to show that heating the ring increases its internal diameter, which is not intuitive for many people. They think the metal would expand into the void instead of outward.

[SoLrr]

Engine builders use this technique to put sleeves in engines or even press bearings sometimes

[calj]

This is how blades are put on a disk in the farming world. When you heat the disks the holes will also expand in size. They are slipped on the bar, and when they cool are completely secured

[abovegroundgarage]

You can also do this with fluid. Transmission fluid is a good one.

[highspeedboom]

In jet engines we use dry ice to contract one part while the other part is heated in an oven. You can then put the cold part into the hot part. It’s called a interference fit.

[tabularasa]

Also the hoop heats up from the contact with the metal ball making the hole larger.

[eribertoacedo]

I rebuilt my Panhead engine in my kitchen. I put the cylinders in the oven at 450° around there for about an hour. I also put the valve guides in the refrigerator and froze them for about an hour or so when it was ready I had my wife grab one of the valve guides which I labeled one through four, set a cylinder on top of some burlap sacks, and proceeded to put the valve guides in the cylinder heads, when in great. Heat expands, cold contracts like your experiment you’re showing us. Mine was on a Harley Davidson.

[libertyquest]

I do fence for a living and a customer's gate. I kept coming unlocked at nighttime and just opening, and I finally figured it out. The latch was only a fraction of an inch catching, and every time, it would get cold. It would contract, and the door would just open. 😊

[Spartacus-]

I have alway loved this thermal expansion demo it's the best practical way to demonstrate the principle.

[stevespoor-ebuw]

Just the heat of your hand can put the part out of tolerance if you are working in very close tolerances.

[TheHansoost]

I've seen extreme cold gas used to free up a piston stuck in a cylinder. Worked like a charm with a mallet tap.

[nebulousJames]

Thank you. I showed this to all of my health classes. Stay safe

[MaltaMcMurchy]

Thank you for demonstrating the effect for us! 🌟

[Chris-gqz]

We use thermal expansion in our steam turbine, have to heat up the turbine blades and turbine shell very slow, we call it a soak, where we move slow pressurized superheated steam through the turbine to slowly heat all portions of the turbine at the same rateso the turbine blades dont rub against the turbine shell, pain stakingly hard to do but really only nessisary on a cold start, a hot start is alot more smooth and quick and we can do a low load soak for about 30 minutes at full 3600 rpm

[TheNarrowPath]

Just reading the comments, you can see how practical this is in so many jobs. Most people think, I’ll never use that for anything. Well, it depends on what field you wanna specialize in.

[TonkarzOfSolSystem]

Can you do the demo where a charged rod deflects flowing water from a tap?

[tigtk]

I remember doing this experiment 30 years ago in grade 6. Nostalgic

[JH-zogk]

Ive seen inner tierod get 1/8" longer torching them to break the rust off during an alignment. Many people use a torch to break the parts loose. Most never think to cool them back off before making the adjustment cause after it cools back off and contracts it messes up your toe angles.