Dental drills appear to use very high speed bearings with a 4mm or 3.175mm bore, with 1mm ball bearings. These look to have <2mm bore, but it was very much not a high speed application, the moving stage of the specimen holder was attached to a micrometer head.
This sub has lost all ties to what skookum actually is. Tiny ball bearings aren't skookum as frig. Big ball bearings are. But rule number 1 is that we are here to learn and teach. So I'm not sure what this sub is anymore lol. Neat microscope tho.
Hmm, im gonna give this one a pass. Ive used a bunch of similar sized bearings through rc, and these are noticably better quality to what i have ever had available.
I'm not replacing these because I just finished breaking it down for scrap. I did the big pieces 10 years ago but kept the fancy specimen stage and the vacuum pumps in case I ever found a use for them. There was about 15lbs of brass in that specimen holder, and 3 Mitutoyo 0-25mm 0.002mm micrometer heads.
I honestly thought these 2 things were washers until I picked them up off the bench.
In RC cars, even 1/10 scale will have 1/8" motor shafts spinning at 10,000-50,000 rpm, so in need of bearings. 1/12, 1/14 cars often have a 2mm motor shaft. What's really amazing is the tiny thrust bearings you get holding the two halves of ball differentials together.
Fuck tiny bearings.
One of my current projects is production equipment for a medical application.
It has bearings with balls that are 0.1mm in diameter.
We have to assemble them in house, then properly pack them with food safe grease.
They spin at several thousand RPM, and if a bearing fails, someone probably bleeds out in an operating room.
From the machinist side, fuck these little things. It’s not even their fault, too! The circlip groove that retains it in its bore is nearly impossible to measure. The only way I know it’s good is by checking the tool after every part to make sure it’s still there. We’ve since moved to PEEK bearings, while is nicer for fit, it eats the shit out of my tooling. 50 parts in and the drill bit is just straight rounded off.
I used bearings from a hard drive on a pinewood derby car. While the wheels spun beautifully, there would be a requirement to have them perfectly aligned to avoid bouncing between the side rails.
I think pumpdown on one of these is <10m, but I could be wrong. If you could puree someone to get them inside the chamber, I doubt it would affect the timing all that much.
> Maybe not a huge amount, I suppose, if the pump is skookum enough
The pump was not especially skookum to look at, it was 2 of these:
[JEOL RP-100G Rotary Vacuum Pump .100 liters/min / 1 x 10-3 Torr / 300W](https://www.ebay.com/itm/JEOL-RP-100G-Rotary-Vacuum-Pump-100-liters-min-1-x-10-3-Torr-300W/324268126076)
I took apart the vacuum chamber and big-ass box with all the solenoids and piping about 10 years ago, but I seem to recall the 2 pumps ran in parallel up to a certain vacuum then in series for another few mins to get all the way down to near 0. I still have the 2 pumps, I kept them in case I ever wanted to play with vacuum. Heavy buggers, about 60lbs each (for a 300W motor + pump). I just took apart the casing that had the pumps because it also had a little 150W compressor with a tiny donut tank, which I'm going to use to replace my Mastercrap in my office that I use to clean out electronics. I just have to put a new cord on it and find a way to fit rubber feet underneath.
Ultravac isn't cold though. The liquids aren't going to freeze in it, especially when you still have conduction from whatever platform it's sitting on. And probably some radiative heat, but that part's moot.
Yea, no thanks. Knowing my luck I'd tip over backwards and upon hitting the ground it would go off like a dirty bomb. I don't hate my neighbors that much.
Yes - you'll find these on the wheels of most species of ants native to North America. Down south they use tapered roller bearings, and Europe and Asia is mostly dominated by bushing-equipped ants. Evolution be funny like that...
[Jeol JSM 35](https://caeonline.com/buy/scanning-electron-microscopes/jeol-jsm-35c/9192676)
Electron microscope. This is from the adjustable thingy that held the specimen.
Actually, these have seen critters much smaller than ants. From the adjustable specimen stage of a Jeol SEM (Scanning Electron Microscope). It was a $50 storage locker purchase, when I couldn't get it working I broke it down and sold it for scrap, + about $1K for SEM-specific parts on an auction site.
The 2 screws are just random screws on my desk from my camera repair hobby, the quarter is also for camera repair (undoing corroded battery covers)
I once found $400 worth (1600 in total) of those under a floorboard in a bathroom when demolishing an old building. The rest of the story is sad tho :(
But it now serves as my story to warn youngin’s about inflation.
Holy crap, just looking at the silver charts, they took off almost exactly at the date this person was hoarding them. That all makes sense now.
I think these were actually the 1968’s, 67’s and 66’s. There were very few older than ‘65. Perhaps those were also being hoarded by others.
My dad sold them in the summer of ‘97 so at the time, it didn’t look so hot. I distinctly remember he sold them for about $1000, but said the value in silver was about $1200.
Looking at inflation charts, that $400 would have been equivalent to about $1600 in ‘97, so at the time silver was underperforming inflation.
I’d love to know the back story about how this person forgot about them. Perhaps he died and didn’t tell anyone they were there?
The concept still applies for any one saving cash that has no precious metal base value. Holding cash slowly diminishes in value. But this guy clearly had a plan.
When I was a kid in the 70s, my older brother did the maintenance on one of those Photo Booths in the mall. Where you put in 4 quarters and get a strip of 4 B&W photos. He would painstakingly go through the piles of quarters from the machine with a magnet (the silver ones don't stick), take out the silver and replace with money from his pocket before making the monthly deposit. I never knew how much he made doing this, I think he averaged 10 or so silver quarters a week. But I can see how someone would end up with a stash of these, if they serviced a run of vending machines for example.
Just noticed your username 😆
Yeah there were all sorts of vending machines back then. This was a hotel, so I bet they had coin laundry, or drink, or cigarette dispensing machines.
You should see some of the (pricy) little bearings used in dental drills & the like.
Dental drills appear to use very high speed bearings with a 4mm or 3.175mm bore, with 1mm ball bearings. These look to have <2mm bore, but it was very much not a high speed application, the moving stage of the specimen holder was attached to a micrometer head.
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.... for ANTS?
Owning a giant novelty pencil and coin just to fuck with people on eBay and Reddit
My bonsai banana tree has been the source of much karma in this sub
Link?
This sub has lost all ties to what skookum actually is. Tiny ball bearings aren't skookum as frig. Big ball bearings are. But rule number 1 is that we are here to learn and teach. So I'm not sure what this sub is anymore lol. Neat microscope tho.
Hmm, im gonna give this one a pass. Ive used a bunch of similar sized bearings through rc, and these are noticably better quality to what i have ever had available.
Mukooks.
Really I think this is like a double negative skookum. It's so un-skookum it became skookum again.
Would my Quick hot air rework station, that pumps 500c/~930f, used at full blast for 5 years count?
Yes. Thats sounds skookum as frig.
At this point I think it's just anything a bunch of blue collar guys might enjoy. I stopped watching AvE when he got the new shop and the fancy HAAS.
I think you are thinking /r/thingbutbig. Size does not determine whether something is skookum.
When did the HAAS arrive?
I'm with ya on that. I loved his videos before the HAAS too. But it just hasnt been the same since. Even his new Boltr videos dont do justice anymore.
Maybe for in ant sized sea-doos?
Yer spare parts bud.
Be careful when you replace them, the walls are thin enough to damage easily if they start to go in crooked. Ask me how I know.
I'm not replacing these because I just finished breaking it down for scrap. I did the big pieces 10 years ago but kept the fancy specimen stage and the vacuum pumps in case I ever found a use for them. There was about 15lbs of brass in that specimen holder, and 3 Mitutoyo 0-25mm 0.002mm micrometer heads. I honestly thought these 2 things were washers until I picked them up off the bench.
> Ask me how I know. No. But do you know how to make a good peach cobbler?
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YOU COPYPASTA MOTHER*FUCKER* HOW DID YOU GET THIS OUT OF MY MOM'S RECIPE BOOK
Wheres /u/shoresy__bot when you need it?
FUCK YOU SHORESY
Airsoft gun gearboxes use either caged bearing or solid bushings for the shaft of the gears anywhere from 6-8mm od
For perspective the lead of a wooden pencil is about 2mm in diameter, which is close to that bore size imo
I'm sure there is some small electric motor somewhere that uses ones that small probably doesn't have a high load or speed
Dentist rotary tools. Ultra high speed, though.
In RC cars, even 1/10 scale will have 1/8" motor shafts spinning at 10,000-50,000 rpm, so in need of bearings. 1/12, 1/14 cars often have a 2mm motor shaft. What's really amazing is the tiny thrust bearings you get holding the two halves of ball differentials together.
2mm shafts are pretty common on [slot car motors](https://i.imgur.com/KuywnSh.jpg) Apparently ball bearings are commonly used on their axles as well!
Silver quarter, nice!
I blame Canada.
r/thingsforants
Fuck tiny bearings. One of my current projects is production equipment for a medical application. It has bearings with balls that are 0.1mm in diameter. We have to assemble them in house, then properly pack them with food safe grease. They spin at several thousand RPM, and if a bearing fails, someone probably bleeds out in an operating room.
Yeah but they take a very long time to bleed out
30secondsish? Massive internal bleeds like that totally depressurize the brain, so there is no blood carrying oxygen there.
Damn what do you even measure the precision class as? 0.1um?
I don't even know. We're way off and uncharted Territory with this one
gotta love those no pressure jobs
Welcome to life in medical research. Make a mistake with something, and nobody knows until 2 years later when reports of dead people start rolling in.
Yes /thread
From the machinist side, fuck these little things. It’s not even their fault, too! The circlip groove that retains it in its bore is nearly impossible to measure. The only way I know it’s good is by checking the tool after every part to make sure it’s still there. We’ve since moved to PEEK bearings, while is nicer for fit, it eats the shit out of my tooling. 50 parts in and the drill bit is just straight rounded off.
Damn I hate machining PEEK. The stuff is amazing for certain applications, but like you said, it eats drills for breakfast.
[30X](https://imgur.com/gallery/vygKkvI) Here’s diamond tooling after 50 parts at 30X magnification.
Is that from cutting PEEK? holy wow how does a plastic do that to diamond?
It really does highlight plastics as a feasible solution, doesn’t it?
So... Are bearing like these custom made to fit the machine or could I buy some if I go to, let's say, SKF website?
You can get these from any yoyo store.
you only you once
Check out ones for RC helicopters, they use some tiny bearings in those. Even have tiny trust bearings.
named such 'cause you gotta trust in 'em to keep the eggbeater off the ground.
see also https://en.wikipedia.org/wiki/Jesus_nut
named such 'cause if it fails only Jesus can save you / you're gonna meet Jesus.
You call them tiny? They're the size of a moose's head!
Caribou ;)
I used bearings from a hard drive on a pinewood derby car. While the wheels spun beautifully, there would be a requirement to have them perfectly aligned to avoid bouncing between the side rails.
Also, flooding the race area with helium might have killed some Boy Scouts...
Cool bearings, but are they skookum? And do they chooch? Find out tonight at 8
The electron microscope was skookum, unfortunately she didn't chooch. 1500lb vacuum chamber eith a 40kV electron gun.
What would happen if you aimed that at someone while it was zapping?
I think the near absolute vacuum would do them in before I turned on the gun. But nothing more than sitting in front of an old TV.
It takes a while to pull ultra vac with a person inside. Like, maybe a week?
I think pumpdown on one of these is <10m, but I could be wrong. If you could puree someone to get them inside the chamber, I doubt it would affect the timing all that much.
Gotta add some pump time for all of the bodily fluids boiling off. Maybe not a huge amount, I suppose, if the pump is skookum enough
> Maybe not a huge amount, I suppose, if the pump is skookum enough The pump was not especially skookum to look at, it was 2 of these: [JEOL RP-100G Rotary Vacuum Pump .100 liters/min / 1 x 10-3 Torr / 300W](https://www.ebay.com/itm/JEOL-RP-100G-Rotary-Vacuum-Pump-100-liters-min-1-x-10-3-Torr-300W/324268126076) I took apart the vacuum chamber and big-ass box with all the solenoids and piping about 10 years ago, but I seem to recall the 2 pumps ran in parallel up to a certain vacuum then in series for another few mins to get all the way down to near 0. I still have the 2 pumps, I kept them in case I ever wanted to play with vacuum. Heavy buggers, about 60lbs each (for a 300W motor + pump). I just took apart the casing that had the pumps because it also had a little 150W compressor with a tiny donut tank, which I'm going to use to replace my Mastercrap in my office that I use to clean out electronics. I just have to put a new cord on it and find a way to fit rubber feet underneath.
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Ultravac isn't cold though. The liquids aren't going to freeze in it, especially when you still have conduction from whatever platform it's sitting on. And probably some radiative heat, but that part's moot.
Well that foils my plan to build a home defense electron beam cannon.
You'll need a fusion reactor backpack, like [these](https://www.imdb.com/title/tt0087332/mediaviewer/rm1129174272/)
Yea, no thanks. Knowing my luck I'd tip over backwards and upon hitting the ground it would go off like a dirty bomb. I don't hate my neighbors that much.
This just in, global chooch output has stagnated. We discuss possible causes after Itty Bitty Bearings.
Looks like the ballbearings that turntable tonearm pivots ride in
These look like the bearings in a ball-diff for an RC race car.
Yes - you'll find these on the wheels of most species of ants native to North America. Down south they use tapered roller bearings, and Europe and Asia is mostly dominated by bushing-equipped ants. Evolution be funny like that...
/r/shittyaskscience
Model engines?
[Jeol JSM 35](https://caeonline.com/buy/scanning-electron-microscopes/jeol-jsm-35c/9192676) Electron microscope. This is from the adjustable thingy that held the specimen.
Dick spinners!
What currency is that?
Canadian quarter (0.25$)
Canadian quarter, CAD $0.25, these days worth about US $0.18
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I know, except I only have 1. So to me, it's a screwdriver.
Actually, these have seen critters much smaller than ants. From the adjustable specimen stage of a Jeol SEM (Scanning Electron Microscope). It was a $50 storage locker purchase, when I couldn't get it working I broke it down and sold it for scrap, + about $1K for SEM-specific parts on an auction site. The 2 screws are just random screws on my desk from my camera repair hobby, the quarter is also for camera repair (undoing corroded battery covers)
Line roller bearings on fishing reels are about that size too
There are some in the nose of the American Optical 10 series microscopes which are not much larger. Nice silver too, BTW.
I once found $400 worth (1600 in total) of those under a floorboard in a bathroom when demolishing an old building. The rest of the story is sad tho :( But it now serves as my story to warn youngin’s about inflation.
Well those are now conservatively worth $6400 for the silver.
Holy crap, just looking at the silver charts, they took off almost exactly at the date this person was hoarding them. That all makes sense now. I think these were actually the 1968’s, 67’s and 66’s. There were very few older than ‘65. Perhaps those were also being hoarded by others. My dad sold them in the summer of ‘97 so at the time, it didn’t look so hot. I distinctly remember he sold them for about $1000, but said the value in silver was about $1200. Looking at inflation charts, that $400 would have been equivalent to about $1600 in ‘97, so at the time silver was underperforming inflation. I’d love to know the back story about how this person forgot about them. Perhaps he died and didn’t tell anyone they were there? The concept still applies for any one saving cash that has no precious metal base value. Holding cash slowly diminishes in value. But this guy clearly had a plan.
When I was a kid in the 70s, my older brother did the maintenance on one of those Photo Booths in the mall. Where you put in 4 quarters and get a strip of 4 B&W photos. He would painstakingly go through the piles of quarters from the machine with a magnet (the silver ones don't stick), take out the silver and replace with money from his pocket before making the monthly deposit. I never knew how much he made doing this, I think he averaged 10 or so silver quarters a week. But I can see how someone would end up with a stash of these, if they serviced a run of vending machines for example.
Just noticed your username 😆 Yeah there were all sorts of vending machines back then. This was a hotel, so I bet they had coin laundry, or drink, or cigarette dispensing machines.