Nix

All has been said, just focus on two simple facts until you get them, 1) sliding of balls in BB is UNDESIRABLE 2) grease INCREASES sliding.

Ah, funny projections. You clearly have no idea what ball bearings are supposed to do nor the mechanins involved. You keep repeating stupid statements like "greasing the outside of the outer race of the bearing? Or the inside of the inner race of the bearing". You don't even know what you're saying. Again, i am putting it very simply for you but you are just incapable of getting it. Let me draw it to you again. 1) sliding of balls in BB is UNDESIRABLE 2) grease INCREASES sliding Still, grease is used to prevent WEAR and other reasons. Get this and then i'll further remove your confusion

You are again not getting it so you ask confused question. Just answer this, if sliding of balls in ball bearings is undesirable, why do they grease them (which increases sliding). Already answered it for you.

No it's not, "Because you talk about a greased frame which makes me it sound like the bar is supposed to be sliding against the circular frame." see you interpreted it totally wrong. Bar is not supposed to slide, it has a bearing on each end that rolls and sliding is undesirable. I already wrote in original post how plastic on plastic (or ungreased steel on steel) may be more desirable than greased steel on steel for the reason grease increases the possibility of sliding. In ordinary bearing sliding is also undesirable but they still grease it to prevent wear.

It is clear and put very well in English, you are just not getting it for some reason. Again, is it hard to imagine a rotating bar with a ball bearing on each end and as bar rotates ball bearing on each end ROLLS against the frame. It's not. That's all there is to it.

You got it all wrong altho it's and very simple and very clearly explained. As cleary written, It is a rotating steel bar with a ball bearing on each end rolling against a frame, not sliding as you say. I clearly said i am trying to eliminate sliding. Frame is greased for reasons any ball bearing is greased, primarily to prevent wear of the material, NOT to decrease rolling friction. So i am not asking about slip IN the bearing, but slip of two bearings on the end of the rotating bar against the frame. But i may leave out the grease for exactly the reason of reducing possibility of sliding.

@DKNguyen You are wrong again. There's nothing contrary between any part of the post. It may be that English is not your first language but you clearly have trouble understanding it. Already in the 2. paragraph i make clear rolling friction is orders of magnitude smaller and thus what i choose, i wrote clearly "So, i am going with ball bearings on the ends of the bar to take advantage of the rolling friction.". I also made it clear i wonder how much of unwanted sliding is to be expected. Sliding is an issue that happens in most ball bearings, whether balls are steel or ceramic. Learn to read.

Budget was never part of the question, we're talking steel not some exotic superexpensive materials. And you started going on about NASA budget and whatnot.

@DKNguyen You're the one still missing the point. I never mentioned budget, you were the one who brought up budget. So you don't even know what you're saying. And you are the one sidetracking with the budget thing. I have already figured out what suits me, you are apparently incapable of understanding English. COF of 0.001 (rolling hard steel on steel) is more than acceptable. Only question is, again, how much sliding is to be expected, probably not much. You don't even know what you're saying, you're sidetracking with nonsense. Next time think twice before making a useless, dumb comment.

@DKNguyen You're the one missing the point, there is no budget cutting. NASA is overpayed, they are made to look "underpayed".

@DKNguyen Well, one day you will learn NASA "budget cutting" was part of the cover story, that real developments are totally black and that is where the missing trillions go. But you have no need to know NASA is just an act, a fake show for the public.

@DKNguyen COFs are the key point of the story, it all comes down to COFs so of course i mention them and compare them. I know what i need, i wrote clearly i am going with hard steel on hard steel - rolling, for clearly noted reasons. I was just asking for the opinion on how much sliding is to be expected as some sliding indeed happens in ordinary bearings too and it is a cause of unwanted friction. So i know very well and 'stringently' what i am going with. And no, it's not about budget, it's about most efficient solution, even if it costs more.

@DKNguyen Unlike you, i know perfectly well what i need. Question is formulated very clearly, nothing about it is "splitting hairs". I was looking for opinion of an knowledgable person, which is clearly not you, altho i know the answers already and have written all the key points. Also, am not making a bearing but a bar that rotates against the frame, not exactly a ball bearing. Referring to NASA as supposed cutting edge of technology shows how sadly behind you are, my my, if you only knew NASA is a front for the black world of mil-ind complex thousands of years ahead, but nevermind that.

bye

i think i seen enough of your humor. take care xD

it's hilarious!

no, it's not...

"propeller" "giant rectangular prism" :D lololo

ok, i don't have time for your satire so

good for u :)

funny

haha

lol, ur kidding right

in short induction motor is "pushing", synchronous is "pulling" and dc is doing both

i am deeply into electronics so

ok

im here, it's just there is nothing to ponder anymore, best solution is steel on steel no grease

yes

ofc

there is nothing to it, only logical way

like if you have a normal shaft and you weld a bar at 90° to it, instead of armature, there is just a bar

just a bar on a shaft

no, bar is a bar, like letter I

I just said "bar has bearing on each end"

You can ask me here, simpler.

It's just that bar has bearing on each end to take advantage of rolling friction and avoid sliding.

Why you call it bearing, it's not really a bearing, it's a rotating steel bar and a steel frame.

No, i wish i could tell you the purpose of the device but i said as much as i can for now.

Of course it outweighs the wear from sliding and rolling, otherwise grease would not be used. Well, there are greasless bearings but these are not yet widely used. youtube.com/watch?v=h9O5QQuFgrc

Ah, funny projections. You clearly have no idea what ball bearings are supposed to do nor the mechanins involved. You keep repeating stupid statements like "greasing the outside of the outer race of the bearing? Or the inside of the inner race of the bearing". You don't even know what you're saying. Again, i am putting it very simply for you but you are just incapable of getting it. Let me draw it to you again. 1) sliding of balls in BB is UNDESIRABLE 2) grease INCREASES sliding Still, grease is used to prevent WEAR and other reasons. Get this and then i'll further remove your confusion

You are again not getting it so you ask confused question. Just answer this, if sliding of balls in ball bearings is undesirable, why do they grease them (which increases sliding). Already answered it for you.

No it's not, "Because you talk about a greased frame which makes me it sound like the bar is supposed to be sliding against the circular frame." see you interpreted it totally wrong. Bar is not supposed to slide, it has a bearing on each end that rolls and sliding is undesirable. I already wrote in original post how plastic on plastic (or ungreased steel on steel) may be more desirable than greased steel on steel for the reason grease increases the possibility of sliding. In ordinary bearing sliding is also undesirable but they still grease it to prevent wear.

It is clear and put very well in English, you are just not getting it for some reason. Again, is it hard to imagine a rotating bar with a ball bearing on each end and as bar rotates ball bearing on each end ROLLS against the frame. It's not. That's all there is to it.

You got it all wrong altho it's and very simple and very clearly explained. As cleary written, It is a rotating steel bar with a ball bearing on each end rolling against a frame, not sliding as you say. I clearly said i am trying to eliminate sliding. Frame is greased for reasons any ball bearing is greased, primarily to prevent wear of the material, NOT to decrease rolling friction. So i am not asking about slip IN the bearing, but slip of two bearings on the end of the rotating bar against the frame. But i may leave out the grease for exactly the reason of reducing possibility of sliding.

@DKNguyen You are wrong again. There's nothing contrary between any part of the post. It may be that English is not your first language but you clearly have trouble understanding it. Already in the 2. paragraph i make clear rolling friction is orders of magnitude smaller and thus what i choose, i wrote clearly "So, i am going with ball bearings on the ends of the bar to take advantage of the rolling friction.". I also made it clear i wonder how much of unwanted sliding is to be expected. Sliding is an issue that happens in most ball bearings, whether balls are steel or ceramic. Learn to read.

Budget was never part of the question, we're talking steel not some exotic superexpensive materials. And you started going on about NASA budget and whatnot.

@DKNguyen You're the one still missing the point. I never mentioned budget, you were the one who brought up budget. So you don't even know what you're saying. And you are the one sidetracking with the budget thing. I have already figured out what suits me, you are apparently incapable of understanding English. COF of 0.001 (rolling hard steel on steel) is more than acceptable. Only question is, again, how much sliding is to be expected, probably not much. You don't even know what you're saying, you're sidetracking with nonsense. Next time think twice before making a useless, dumb comment.

@DKNguyen You're the one missing the point, there is no budget cutting. NASA is overpayed, they are made to look "underpayed".

@DKNguyen Well, one day you will learn NASA "budget cutting" was part of the cover story, that real developments are totally black and that is where the missing trillions go. But you have no need to know NASA is just an act, a fake show for the public.

@DKNguyen COFs are the key point of the story, it all comes down to COFs so of course i mention them and compare them. I know what i need, i wrote clearly i am going with hard steel on hard steel - rolling, for clearly noted reasons. I was just asking for the opinion on how much sliding is to be expected as some sliding indeed happens in ordinary bearings too and it is a cause of unwanted friction. So i know very well and 'stringently' what i am going with. And no, it's not about budget, it's about most efficient solution, even if it costs more.