Steel VS Full Ceramic Bearings (Friction Test)
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- Опубліковано 4 кві 2015
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In this video i'm showing the main difference between standard steel ball bearings and full ceramic ball bearings which is the amount of friction that each has. You can immediately see the difference as soon as both are spun. I bought these in order to install them in my CNC steam turbine and see if it can actually produce more power for which i doubt that it will make a huge diffence, but we shall see;)
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Wow. A no load bearing test with no grease in either of them that proves almost nothing. Impressive.
The friction in the SST bearing is the grease fill and the rubber seals. There would be little difference in the spin test if you compared a non-sealed ungreased SST bearing to that of the ceramic bearing
yep...got two different metal bearings at home to weigh out my connecting rods of my engine, decided to run them dry and with silicone spray...everything else (motor oil, multifunctional oil, assembly oil, grease or PTFE spray) has too much friction on itself...they even spin completely dry like the ceramic one in the video, but you can feel light scratching after a few turns.
otherwise you can use the ceramic ones without grease etc., as he wrote in the video an that's why he bought it, so it's better after all.
Apple to Orange comparison
so this goes to show, a dry unloaded bearing, no matter how you play with it, will spin freely a lot longer than a bearing with sticky grease and stuff in it ...
okay, now for the 2 ton load test ...
Headphone volume alert at 2:55.
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Wish i had seen your comment earlier xD
too late it already woke and startled up my kitty!!
FML, had volume full and thought it would do something and then BOOM, my ears exploded. haha
too late, i am now deaf
Oh for the love of christ, let's go over this again then kids.
Testing a bearings free run ability proves two things, how loose it is and how dry it is. If you got another worn out steel bearing, washed out the lubricant and tested it as you did that would be the clear winner. Next to that a tight fitting, lubricated, sealed bearing will be the absolute worse at free running.
+MsSomeonenew Amen
+MsSomeonenew but it will last much longer and take more force..... they are like all these guys washing out the lubricant of rollerskate bearings... and yes we did this aswell (as kids)... bearings just loose their meaning and breake if you run them dry.
remove seals from steel bearing and clean out oil/grease. Then you have a solid comparison.
yep!!!
yeah...
still waiting for a independent bearing Test to come...
ceramic bearings are louder, and if you want to put them on a tight shaft you need to be careful.
Torben Lien Ljungberg Meyhoff but you wouldent use a steel bearing without oil.
+Torben Lien Ljungberg Meyhoff
I was thinking this the whole time watching the video. It's the seals which is causing most of the drag on the steal bearing.
thanks for posting the price , i hate it wen people leave stuff like that out
The rubber shield will cause friction and slow it down,the ceramic bearing had no shield and will rotate faster.
for a rubber shield/ seal to do its job it has to touch somewhere in order to do its job. in the case of bearings like these it's fixed to the outer race and seals against the inner race. if there is a gap it won't seal.
and no oil.
And....the ceramic has no protection from dirt and debris with no shields.
I believe what he means is that the shield doesn't touch the actual ball bearings but rather the lip of the shield rides on the inner race...near the center....causing drag.
The rubber shield is fixed againt the outer race and it seals against the inner race and friction will be generated at that point. The seal won't touch the actual balls. The steel sealed bearing will also contain grease. This will drag and slow the bearing down.
Hello. The shielded stainless steel ball bearing is lubricated by the grease. It slow down the rotational speed! You should be remove the seals, remove the grease and apply a light oil like the wd-40 and repeat the test. Regards from Italy.
+sandronovecento76 grease is ok just need heat becuse they used for works under heat.
+sandronovecento76 Good Point!!!
+sandronovecento76 WD-40 turns to sludge at high speeds.
+DronePower Ok DronePower, the WD-40 is not good for the high speeds but a ceramic light oil work fine ;)
+sandronovecento76 Yeah ☺
This so called "test" shows nothing.
The steel bearings have viscous oil and seals which affect the results.
Also steel bearings have specific fit and are designed to work best under specific load.
Agree with you Yuri. This 'test' isn't like for like. The test is skewed from the outset and the results are meaningless.
yes i just install iron bearing
with loading make iron bearing spin on and on.
get a normal bearing, remove dust covers, clean with alcohol, so theres no oil left and test again. no oil sounds cruel, but it spins like a ceramic bearing lol
gamerpaddy interesting comment
gamerpaddy I've done this before and while it spins like a ceramic, gradually it builds more and more friction until it's mo nore functionable...In that case it needs a very special and thin lubricant...
gamerpaddy Right. That friction is from the grease in the steel bearing. This test is comparing apples to oranges.
gamerpaddy completely invalid testing. The air nozzel should be fixed for proper comparison plus remove the rubber seals and grease from the steal bearings. There are plenty of corrosion inhibiting treatments that can be done to the steal bearings as well as steam born lubricants combined still wont come close to the price of the ceramics. The only place the ceramics would be worthwhile would be in extremely corrosive or extreme high heat environments. Otherwise a total waste of money.
That sounds like a great way to get a seized bearing.
In regards to those who feel a need to alter the steel bearing to get an equivalent test, you would end up with an incorrect test result.
Equipment is always tested in the finished condition as it is designed to be used.
Even though this is of no use to me, because I'm not really into physics/engineering, I find this incredibly interesting :D For some reason, I'm very curious about this type of stuff, and it's fun to watch objects being tested and compared.
Put into words, DO MORE VIDEOS!
ceramic bearings are made for specific environments. eg. corrosive environments and super hot environments. Zirconia (ZrO2) bearings don't take to steam environments very well because the Yittria stabilizer leaches out over time which leads to a crystaline phase change and thus cracking. they are only the tip of the iceberg..boron bearings are far more heat resistant and work in temperatures that would melt metal bearings..BUT...overall ceramic bearings don't outspin metal bearings. The comment below about the dust shields is right.
Where is the stress test on each bearing? I want to see ceramic bearing blows up :)
What part of "rubber shield was it that you didn't understand ? in addition to this steel bearings are available in different quality grades; somewhere between .35 cents and $20, for instance.
looks like your steel bearing is a sealed bearing (normally packed with grease) .. a fair friction test would require you to remove the seals and wash out the grease .. and/or at least have the same lube in both bearings.
The best review and comparison of bearings on UA-cam. Thank you.
May have to upgrade the bearings in my Heelys now.
You your video would have so many more views if you spoke, i know its hard listening to yourself sometimes but you would sound normal to everyone else.
+res1492 Well I did speak in the next videos after this one and they didn't go so well.. I mean perhaps people do prefer my videos with not my voice...
lol, i wouldn't go thinking that, perhaps its just me but i like to hear an explanation when im looking at a new product, either way you got yourself another sub, thanks
+byron brush You get used to it, believe me. ;) And it is always better than annoying subtitles.
+res1492 nope. no voice it's way better. Trust me.
im talking about videos, not marriage!!
There is no point comparing those bearings under no load... Remove the oil and the shields and the steel one will perform much better...
Amazing what one can get for 23 or 35 cents, seriously. Nice demo.
Thanks for the vid.
Appreciate the video.
If you skip to 2:56 and listen closely WITH HEADPHONES. You can here something in the background. Also so you can here it make sure your volume is all the way up.
They need to be under a load test for applications in machinery. As for applications for things such as fishing reels where when casting the load on the bearing is next to nothing it was a perfect test. It sold me on switching to abec 7 ceramic bearings
great video
The biggest difference maker between the two(under load from anything to machine to skateboard wheels) is metal bearings expand under heat which causes more friction, Ceramic doesn't expand under heat as it's already been baked. You get no further loss of friction.
Unless you remove the grease from the stainless bearing you can't make an accurate comparison because the drag coefficient is obviously going to be much higher because of the grease v/s the light oil.
Why on earth would you test a bearing in any condition other than the condition it will be operating in? Sure you can remove the shields, degrease, and add specialty oil, but where you're using the bearing, It needs the grease and shield to function. The comparison is between 2 as purchased bearings. No one expects a $0.35 bearing to exceed or even come close to the performance of a $35 bearing. This comparison shows what your money gets you.
As a couple of comments below point out this is not a like for like test. The steel bearing you show has the friction of 2 rubber seals and grease to overcome. The ceramic bearing is running bone dry with no such drag. You mention stainless steel bearings 'corroding' quickly if not oiled. This must be a mistake and you really mean carbon steel bearings which certainly will corrode quick if not lubed.
Nice video
I'm not sure how valid the spin test by hand is as the standard bearing has grease in it, also maybe the air test should last for longer to allow the grease to heat up. I was thinking of ceramic bearings for my bike wheels but what do you think about dirt getting in, do they need to be constantly cleaned?
Yeah, Thought similar, that because it spins harder is then worse. But standard steel bearing is lubricated and will last much longer than ceramic one. Unless you grease the ceramic one which will make it quite similar to operate to steel one. Though still the steel can carry more load and last longer.
Wow. much knowledge such smart.
which bearing is more prone to shock?
i would assume the ceramic bearing would shatter if mounted on an unbalanced object but then only the application of the bearings would determine the outcome.Why are there not ceramic bearings in automotive engines or electrical industrial motors?
by the way, how would you feed the bearing with oil? in other words, I'm looking foward for a home project, on building a small turbine, and if i have to feed with oil, what and how would it be done?
nice, but there are many different types of ceramic bearings... I wanna kno which ones will be suitable for bicycles.
for more should watch the video on :"How to make bearings spin faster/freely"i was unable to paste a link.
nice to see some one spend on specialist bearings hope they do the job you want them to please let us know how long they last for the aplication you intend . a bit like putting glass bearings in a heavy use machine intresting
40% more rpm! That's a huge difference. The price difference is also huge though. ;)
Pues la diferencia es enorme entre los dos, uno por la fricción y el otro por su alto precio. Me quedo con el de acero ya que mis exigencias no son muchas en los proyectos que tengo en mente.
just wondering,is there a ceramic bearing for an engine? for like a 110cc bike?
so I have to ask, what is the difference between the metal (non ceramic) bearing and a standard abec 7 skateboard bearing? mine will spin similar to the ceamic did,
Great video. Thanks for sharing. I figured ceramic would have less friction, but didn't expect the performance level to be quite as dynamic as your experiments.
were the ABEC ratings the same with both bearings? in my baitcasters I use both ABEC 7&9.
Another problem with this test is that the outer race of the steel bearing has a larger rotational mass than that of the ceramic bearing, which would make it spin longer.
You can't argue with those results! How does the load capacity differ between steel and ceramic bearings?
i just got the reference with your name.
johnny quest?
would the ceramic bearings work on a skateboard or would they break?
I agree with a decent bit of the below comments, the double rubber shields completely killed the results of the test.
hi ! how are you ? this ceramic bearing ,can it broke under repeated shock ? I think my ceramic bearing on my skateboard aren't made of ceramic like the bearing you have. Cordially. Waldo
am not sure if it's late posting this!, but I just received 1cm inner ceramic bearings and rod with 1cm diameter, how can I fit ceramic bearings safely without any fraction?!, I didn't find anything in the web to show how, should I lubricate the rod first and put some force so it could fit , or there is more profitional way maybe?!, thanks in advance.
do they make ceramic bearing in miniature size of 2mm ID x 5mm OD x 2.5mm thick?
Great test! Especially because all Ballbearings are made to be flicked by fingers and to rotate with zero load! has harvard contacted you already?
Lol
I have seen some really cheap ceramic bearings for like $2-5 each. Maybe you could compare a few type of bearings of similar price? A $20 bearing is of course gonna be higher quality than a $0.20 one. Do a proper loading on those bearings,spinning it with finger don't count,lol.
why the metal one stuck in the first test ? the one of my rollerblades run like the ceramik...wha size the balls inside have ? are they the same ?
Can the ceramic bearings load can be the same as steel? What about if there's a shock load?
I like your video
Isn't there a significant difference in how a bearing performs under load? Most of the steel bearing resistance can be attributed to the dust cap, which the ceramic bearing doesn't have.
Incredible, thanks a lot 🙏
how to you install them ? do you hit on them ? do you put grease on them ?
you should test Swiss skate bearings. they'll spin for 5 minutes with the turn of a hand.
I wanted to know what ABEC those bearings are, that would have helped
What would the difference be between these ceramic bearing and bones ceramic bearings
but is your one ceramic bearing worth the 65 steel bearings you can get?
in terms of temperature, which one can handle hotter temperature
You need to spin them both at the same speed under rated load for a few hours and measure the temperature. Just free spinning them shows nothing.
Actually, a free spinning bearing says a lot. If your bearing can free spin, it goes to show that, you won't need much energy to spin it. If your bearing can't free spin very well, then it will take a lot more energy to spin it. This is the
problem with automotive bearings. These bearings, not only take a lot of
energy to spin, but if you feel your bearings after running your vehicle, they
are extremely hot, that heat isn't all from your engine as after awhile the bearings are very cool to the touch, even with your engine still to warm to touch bare handed. That heat also adds wear and tear, eventually resulting in
your bearing failing, loosing its side covers and even ball bearings. I had
this issue with an old Jeep of mine.
freekn loved this video , im obviously a huge machine nerd to say that but i love a good hardware review
Your left index finger is much stronger than your right. Lol 🤣
Just upgraded to ceramic in all my reels. Big difference so far. My only concern i the cermaic's durability over time and rough use.
How did the bearings hold up long term?
@@barrygolden9823 seized up and he was sleeping with the fishes.
@@slybunda R.I.P.......lesson learned!!!
Really nice;) I'm wondering if these things could have any advantages in IC engines..
DerKrawallkeks I think i read somewhere about that, where someone put ceramics in a rc model engine and they just disintegeted. They can't take much abuse from the vibrations i guess...
okey^^
Okay:)
because I've had several bearing failures on old engines, that have been running for many hours^^
Can you do a test under load and crash test :D I think steel will be the winner
Ceramic bearings are for light load applications such as a turbo charger. Little do people know.
Bearings are meant to have a load...so naturally one with grease/oil in it will spin slower than the one WITHOUT any lubricant. (Test them with the same lubricant and see what happens!) This way there is no bias. - However ceramic WILL spin to higher speeds and can last longer between lubrication intervals. - An old engineer
J&M D I agree on everything you said, except from lubricating the ceramics.They require very little and thin oil, or not at all. These are full ceramic bearings, not only the balls are made from ceramic material, but also the cage itself...
I don't think this is really a fair comparison -- the point of bearings isn't just to create a surface against which a shaft or other element can spin more smoothly. Instead, the point of most ball bearings is to reduce the effects of non-torsional loads. It is for this reason that four-point bearings are often industry standard, rather than single race ceramic bearings, for instance.
Do they use such long spacers in the ceramic bearing as a cost cutting measure? Wouldn't they be more efficient, and longer lasting with smaller spacers?
+dieselphiend how bigthe spacers or cages ar, depends on how big the balls are. If you remove the cage and move all the balls to one side you can remove the inner ring. btw thats how they're assembelt (sry for the English, I'm german)
Speednike1
My mode of thinking is-- smaller spacers = more balls = less pressure per ball = longer life span. However, it may increase the overall friction coefficient?
+dieselphiend it will, in fact, I've seen some bearings with huge spacers
because the balls can handle the pressure pretty good.
But when it comes to bigger loads you're right, then dissasembleable barrel bearings with almost no space are used, because they dont need the assembly technic I mensioned
How much noise do those ceramic bearings make?
under load witch can handle more mass on the bearing?
So if its a steel bearing with ZrO2 does it mean its fully ceramic?
This is all fine and good, but these bearings aren't under any load, and there's no real longevity tests. What's more, if you completely degrease the steel bearings, they'll run just as long if not longer under no load. The problem is that once you add a load, you find out why the grease was there in the first place, they degrade quickly without grease.
video is twice as good at 2x speed.
yes but under load? Those bearings aren't loaded to anywhere near their spec
Where can I get a ceramic bearing identical to this one?
in your tests, you must remove the seals and grease from the steel bearing. In the real world, the seals help keep contaminants from the bearing, it will not be spec'd for high RPM use, and will be more resistant to chipping of the races and rolling elements. As for the ceramic? High speed clean-or frequently cleaned-operations are ideal. There are pros and cons of each bearing, as well as many other bearing types. The secret is properly assigning the correct bearing to your application. As time goes by, this is becoming more "secret" each year.
What are the load ratings for both? Which would be most durable?
bigdorkification The steel ones are always more durable than ceramics...
what's the downside to ceramic bearings though, strength?
if you remove the rubber from the steel ...the speed will be the same. and the metal one it's more safe, if u put the ceramic in your skateboard after 5 minutes it's already broke
Nice comparison. I did not know that ceramic bearings even existed.
My skateboard has them
+Sean Gehrke do they withstand higher loads or are they just lower friction? Also how about vibration, do they break?
+Laharl Krichevskoy lower friction, but high load crushes them ;) also they need some grease too- without it would burn pretty fast, just like the steel one
btw. im joining 17583 peopple saying that testing bearing with no load is pointless ;)
+Piotr Sulej Bit like a ceramic knife, completely awesome at what they're intended for but misuse will result in some nasty failures.
nope, ceramic bearings just serve different purposes than steel ones, so comparing them just does not make sense, adn if ceramic ones are so strong, why are they used only in road cycling? not in mtb hubs? mayby because steel one have more vertical strenght? they are not stronger than steel ones, mostly because only the outside of the ball is hardened, inside remains as powder.
doesn't matter if their lighter (which is negligible amount of difference). It is the wheel that dictates the RPM speed.
+Rc Bearings true. Judging by your screen name, you must know what your talking about.
Take the shields off the steel bearing and remove the oil and it will spin just as freely as the ceramic. The test of a bearing is how it performs under load. The only place ceramic makes any sense is in a highly corrosive environment.
What kind of ahit bearring did you bought? This stainless steel bearring doesnt even spin if you rotate it. my own steel bearrings spin for a minute if i spin them. but mine also cost 4$. i guess if you would have bought a better bearring, minimum apec 7 the difference wouldnt be so much high. i was told the difference is about 2 or 3 percent
How does the ceramic stand up over time and under pressure?
brittle they can be
can i have the link to the ceramic ball bearing
As someone has already pointed out. It is pointless to see how different bearings rotate under no load.
Winner is the one on the left as it goes back to the same place as it was before its rotation.
not really a apples to apples test...
It is, but the price...
+Phoenix not really... one is sealed the other is not. one is greased the other is not. neither was put under load... thus faulty comparison
What do you mean by 'under load'? I had an argument recently on youtube where people disputed what 'under load' meant, myself included.
+Mingetease A ball bearing under load is when there is axial thrust or radial forces being transferred to/from the inner/outer race
David Roller bearings are far superior to ball bearings for radial loads... Primary reason to use ball bearings is to react to axial thrust loads and for convenience/cost...
This isn't a comparision at all. Seal less steel bearings that are adapted to high load like heat and speed are excellent. You only use ceramic when you can't use steel for some reason. SKF C3 bearings are a good choice if you want something that will work with high speed and more heat. But if you can't garantee sufficent lubrication i can understand why you would want ceramics.
Check into Abec ratings on bearings
cant argue with the facts!
Which would be better for speed skates??
Elijah Lloyd ceramic