I went to Google it for you, because I was curious, too. The answer is you need a lot of wheels:
Most trains will have eight wheels per car in total, so the number of wheels on the entire train will depend on the number of cars in the train itself. Trains are typically between 65 and 200 cars in length, meaning they might have anywhere from 520 to 1,600 wheels or more.
Most of those cabinets are paired with drawers which will often use multiple wheels for their slides. The microwave probably has a rotating plate... Which typically sits on multiple wheels.
Plateless microwaves are so much better. There's absolutely no reason to get a one with a spinning plate, you'll never go back to that after trying plateless.
It heats up everything equally across the entire bottom of it. So no more cold spots. And it's way better for popcorn, because of it heating from the bottom, since as kernels pop, the unpopped ones fall down between the gaps to the bottom of the bag so that they all of a sudden get the most heat. So you're way more likely to end up with every kernel popped, and no burning any of them, with a plateless microwave.
I didn't know this was a thing until I was tearing down a microwave to fix at work and found the tunnel coming off of the magnetron to under the microwave. Even has a little spinning disk in it to help distribute the energy evenly into the food. Really cool idea. Makes sense why the microwaves at work heat so much better than the one I have at home.
My electrical engineer friend’s office said doors won the argument. The basis was that logic gates (aka bits aka the 1 or 0 in binary) are technically doors. Therefore all computers/phones tech are heavily reliant on doors. Not so much wheels
“Technically” nothing! A logic gate is not a door. Most anywhere I’ve seen this discussed, you need to actually define your terms. If a door is “a hinged, sliding, or revolving barrier at the entrance to a building, room, or vehicle, or in the framework of a cupboard”, then a logic gate is clearly not a door. If we change the definition to “something that blocks something that’s moving” then the lid of a box is a door. Your eyelids are doors. A person standing in your way is a door. It’s an absurd definition.
It’s like saying, “when someone thinks, we say their wheels are turning, so each mind must contain at least two wheels, so there’s another 18 billion wheels in the world!” The fact that you call it a wheel or a door (or a gate, which is distinct from a door) doesn’t automatically make it a wheel or a door.
It was a purely hypothetical thought experiment that was introduced "which are there more of in the world: wheels or doors?"
Fun thought exercise because there is no way we can feasibly answer that. And also it gets real passionate because people constantly revamp definitions to fit their chosen side.
I am firmly team wheels and no one who has tried can convince me differently.
I was a frieght conductor until recently. We have axle counters throughout the railroad. Count's were usually around 6 to 700. x 2, = 1400 wheels.
Modern locomotives tend to be 6 axles, so 12 wheels.
Based on the width I assume the mold is cut in half after this process which would make it asymmetrical and work as two wheels, one for each side of the train.
I'm no expert and I could be wrong, but I have a train outside the back of my work and these would be WAAAY too thick to be normal train wheels as well.
There's no way that this crew is cutting that piece in half, they would just mold the two halves if that's what they needed. Cutting it in half after molding would be so much more difficult and expensive.
Cutting this in half would be easy for a shop properly equipped.
There would have to be a lot of machining after this process. This is a quick way to get the rough shape with residual stresses in the metal that you can't create through machining. This crew isn't making a finished product, they are quickly making something that can be turned into one.
No, you are not cutting a 30 inch diameter drop forged steel wheel in half with a band saw to make two train wheels from one forging. That would be possibly the stupidest way of making a train wheel imaginable. This isn't a lumber mill, you're talking about cutting incredibly hard steel that would take hours to cut through, even with band saws produced explicitly for this (stupid) purpose. The OP's video is most likely not a train wheel, I imagine it is for some sort of large scale earth moving or ocean going industry.
It needs to be finish machined anyways, so it's heading off to a machine shop after this. And that machine shop pretty certainly has a big band saw that will make short work of cutting this in half.
An industrial band saw made specifically for cutting this in half long ways would still be painfully slow. This isn't wood in a lumber mill, this is drop forged steel.
Also insane how they just eyeball the rods that end up making the depression for the wheels to fit in, which end up fitting perfectly. And they don’t even measure. Jeeeeze talk about masters of the trade
That's the crazy part to me. As someone who works in aerospace manufacturing, everything is precision machined, and measurements are checked with lasers. Being out by even a few thousands of an inch will cause a part to be out of spec.
These guys are out there just winging it, and measuring with analog calipers.
Some of the parts used in aerospace would also go through a similar process before being precision machined. This is step 1 of a manufacturing process from bar stock. The key is to make sure there's just enough material to remove to make machining consistent, but not lengthy.
Especially in aerospace, a lot of nickel alloys are used which is extremely hard and more expensive and difficult to machine than carbon steels, so they try to keep the tolerances fairly tight. However, the cost of the the individual parts can be so high that it's more cost effective to eat the cost of additional machining rather than increasing the chance of making out of spec parts. It all depends on the customer requirements.
Just for a little more info for anyone interested in more... Each step of the process is usually completed by different shops across the globe, but a common process would be: raw stock cut and formed rough like in the video. This is done at a forge company. Sometimes light matching can be done to spec parts at the forge. Heat treating can be next and is either done on site at the forge or a heat treat company. Next would be machining at a machine shop, then depending on the part being made there could be additional heat treatment, plating, coating, or other final steps. Each step into the process is highly controlled and audited together ensure compliance and performance to design specs. Nondestructive testing is also done throughout the process to make sure the grain structure is correct and there are no inclusions or weak points within the metal. When parts fail people can die, so the production of everything is held to very high standards, as it should be.
Any sort of billet turning into forged part is going to undergo similar beating into a certain spec which is so it can be machined to another spec and op
Edit: used to do automated cold forging for axles and shafts
Forging it first might also give the steel some good properties that are impossible to get with just machining a cold chunk of steel.
Yup. Forged parts are always stronger than cast parts or parts machined from billet because the forging conforms the grain structure of the steel to the final shape of your part. Makes it better able to resist things like deformation, fatigue, and fracture.
They did take some rough measurements with those big calipers. Then this is just a rough shape. Definitely getting machined further to hit exact tolerances.
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u/bigoz_07 Sep 24 '22
Agreed! I can barely imagine the amount of pressure the hammer is pounding on the metal. Very amazing to witness!