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HomeMy Site✈️Aircraft🚁HelicopterHelicopter Main Discussion › Thrust bearings question
05-25-2018 09:52 PM  14 months ago
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HawkNoob

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Thrust bearings question
Remind me please, as a general rule, is the thrust bearing assembled with the "open side" of the ball cage towards the head or away? Is this heli dependent? Often the manual is not clear on this. Or does it not matter?
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05-25-2018 09:57 PM  14 months ago
Andy from Sandy

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I don't believe it matters which way round the ball carrier goes but I put it so in my mind the grease won't fling out so quick. So the deep side is facing toward the main shaft.
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05-25-2018 10:01 PM  14 months ago
grimthenoble

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does not matterNever go Full Retard!
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05-25-2018 10:04 PM  14 months ago
RM3

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dont matter... the cage is just there to separate the bearings... not to hold grease.showing a preference will only get you into trouble, 90% of everything is crap...
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05-25-2018 10:31 PM  14 months ago
Jeff polisena

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^ Always open cages to main shaft . It doesn't matter but every build picture I can remember shows as stated and I believe TT was specific in their manuals.I stole it ,flew it and gave it back ;)
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05-25-2018 10:35 PM  14 months ago
Dr.Ben

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Hirobo always positioned them in their preassembled metal heads open side out as did TT as noted. Minicopter, in the photo instructions for their 600, does so as well.

Interesting.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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05-25-2018 11:04 PM  14 months ago
HawkNoob

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Dr.Ben
Hirobo always positioned them in their preassembled metal heads open side out as did TT as noted. Minicopter, in the photo instructions for their 600, does so as well.

Interesting.

Ben Minor
That's why I asked. I specifically remember a preferred direction, just couldn't remember which. Coming back to the hobby after 10 years, lot's of things have changed and much has been forgotten
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05-25-2018 11:10 PM  14 months ago
JuanRodriguez

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Bottom line is that it probably doesn’t matter.... But I’ve always installed them with the open portion of the cage facing the hub .....Been there, done that and old enough to know better.....
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05-26-2018 04:31 PM  14 months ago
wjvail

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I always put the open or cup side of the bearing facing the rotor hub. When I began I had the idea that the cup would hold the grease. I could pack the open side of the bearing with grease and centripetal force would keep it in the cupped side.

I doubt it works that way. Personally, I doubt you have to grease thrust bearings at all.

Now it has become habit. There is an exact order to every head grip and it requires some attention to detail to get everything assembled correctly. It really does matter exactly how races, radial bearings and shims are installed. With that in mind, I leave nothing to chance. For me, the cup side of the thrust bearing always faces the center of the head. I assemble everything on a screwdriver and inserted it in the grip. If I ever take one of my grips apart for maintenance and find a thrust bearing assembled any way but my usual, the rest of the assembly is suspect.

I know - it's all a little fussy. Sorry. It's just how I do it. The cupped side faces inward.
"Well, nothing bad can happen now."
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05-26-2018 04:38 PM  14 months ago
Dr.Ben

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I face my cups inward as well. I stack parts on a extra spindle with a bolt and washer on one end.

I have recently started using dry fluid gear. So far results are good and it's much less messy. The Germans use it on their 2500+rpm 700 class speed machine bearings, which I would say is a fair test.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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05-26-2018 04:55 PM  14 months ago
Jeff polisena

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The lube issue or debate is a difference of opinions. I use something because it was said I had to when I started hobby . I feel today a light coat will do the job to keep rust or pitting from contamination and moisture . If you crash like I do then you will keep up on maintenance .I stole it ,flew it and gave it back ;)
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05-26-2018 05:22 PM  14 months ago
dgoss999

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There is a right and wrong way to install thrust bearings.. The inner hole on one side of the race set is generally a snug fit on the shaft, while the other side is quite loose.. The side which has the tighter hole should be installed as the the 'stationary' part. The looser side should be assembled to rotate freely with the blade holder..

DG..
"Believe none of what you hear, and only half of what you see." • Benjamin Franklin
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05-26-2018 06:46 PM  14 months ago
JuanRodriguez

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The one with the larger ID gets installed closer to the hub ....Been there, done that and old enough to know better.....
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05-26-2018 07:48 PM  14 months ago
Jeff polisena

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That is explained but we are talking about the rollers not the outer races . Yes outers are different and have to be installed correctly .I stole it ,flew it and gave it back ;)
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05-26-2018 08:02 PM  14 months ago
JuanRodriguez

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Yes but the topic was brought up on post 12. My post just put it in simpler terms......

Pretty sure it’s already been concluded that it doesn’t matter which way the rollers are installed....

But hey ! We can continue to beat a dead horse some more !!
Been there, done that and old enough to know better.....
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05-26-2018 11:06 PM  14 months ago
don s

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Chesapeake, VA

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The reason to put the cup side out is so that when the rotor is spinning the cup will be forced out and onto the balls.

The reason to go cup in has been explained.
E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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