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HomeAircraftHelicopterHelicopter Main Discussion › Notchy thrust bearings
10-10-2005 09:46 AM  13 years agoPost 1
Yug

rrMaster

UK. Herts

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Hiya. I am just fitting some Infinavation dampers and noticed my thrust bearings are very slightly notchy. I can't make my mind up weather this is OK for now as it's not that bad.

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10-10-2005 10:20 AM  13 years agoPost 2
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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It's not OK.

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10-10-2005 10:40 AM  13 years agoPost 3
Yug

rrMaster

UK. Herts

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Yeah, I've already ordered some new ones.
I tend to replace after about 70 flights. What sort of lifetime should one expect from these ?

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10-10-2005 10:41 AM  13 years agoPost 4
geeo

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Edinburgh, Scotland

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My evo ones lasted 3 good craches

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10-10-2005 10:52 AM  13 years agoPost 5
Al Magaloff

rrMaster

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What sort of lifetime should one
Use some good grease , and install them with the open side facing the rotor hub. Crashes tend to dent the balls and races, otherwise, you won't wear them out, properly lubed.

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10-10-2005 11:05 AM  13 years agoPost 6
Yug

rrMaster

UK. Herts

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Perhaps it was a heavy landing last week after what amounts to a blade stopping auto after engine failure and locked hub.

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10-10-2005 09:19 PM  13 years agoPost 7
w.pasman

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Netherlands

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I had them wear down on raptor 50V1. There the thrust brgs were too small for that load. Too small bearings make them wear out very quick. They increased their size on the V2 and that problem was completely gone. Haven't noticed wearing of them anymore since.
If they are notchy your pitch control will start to act funny, probably the forces are so large that the servos can't get them properly controlled around the point where it is notchy.

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10-10-2005 09:34 PM  13 years agoPost 8
Yug

rrMaster

UK. Herts

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w.pasman
Everything is flying as smooth as silk. I just happened to notice this very slight notchiness when replacing the dampers and I was wondering how notchy things need to be before replacing. I have ordered some replacaments anyway as I think the very fact that I ask the question means they are not perfect so they should be replaced.

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10-10-2005 11:28 PM  13 years agoPost 9
MR SLOWFLOW

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N.J/N.Y

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would damaged t-b make the blades go out of tracking?

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10-11-2005 12:11 AM  13 years agoPost 10
Al Magaloff

rrMaster

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Absolutely.

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10-11-2005 02:12 AM  13 years agoPost 11
Tom DeWinter

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Quad Cities, IL

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Are you really talking about the three piece thrust bearing set, or the two ball bearings in the grip?

I thought I'd destroyed every bearing possible, but never had the thrust bearing get notchy.

Regards,
Tom

Quad Cities RC Whirlybirds -- FunFly July 12 & 13, 2008 Davenport IA
Plan Now to Attend!!!

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10-11-2005 09:48 AM  13 years agoPost 12
Al Magaloff

rrMaster

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10-11-2005 04:41 PM  13 years agoPost 13
geeo

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Edinburgh, Scotland

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I've dsestroyed a few, what seems to happen is the small side of the bearing doesn't want to come of the shaft or go back on a new one and the actual bearing cage gets bashed into the bearings.

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10-11-2005 04:48 PM  13 years agoPost 14
rckrzy1

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Hurst Texas

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Are you really talking about the three piece thrust bearing set, or the two ball bearings in the grip?

I thought I'd destroyed every bearing possible, but never had the thrust bearing get notchy.

Regards,
Tom

Quad Cities RC Whirlybirds --
I'm with you. I have NEVER had a TB fail or get notchy. And I'm rebuilding my pmax after landing on it's head , in idle up no less with a
axle bent 90 degrees and no bearing damage.



Wildcat Fuels

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10-11-2005 05:44 PM  13 years agoPost 15
w.pasman

rrElite Veteran

Netherlands

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Guy,
It probably depends on the type of notchiness
In my case the balls had pressed dents at some very specific location used in the hover range. So the balls were pulled into these dents while hovering. Only with larger pitch movements the balls got out of the holes, but you than had quite some more pitch than required.
Your notchiness might be caused by something different, for instance a grain of sand or dust, a crash, or even by the same cause as with my 50V1 but you might have turned the bearings slightly moving the trouble position to somewhere else in the pitch range.

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10-11-2005 05:55 PM  13 years agoPost 16
Yug

rrMaster

UK. Herts

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The notchness was only very very slight and could just about be felt with the spindle bolts done up so some pressure was being exerted from the dampers. No worries, I've replaced them anyway. I suppose I'm over fussy about bearing smoothness. I worry if I can feel any kind of roughness whatsoever. If when I rotate bearings in my fingers or with a shaft, and I cannot feel a single thing, I'm happy. However, I've never been sure as to what is actually acceptable. I usually end up replacing all bearings every 70 flights or so.

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10-11-2005 09:28 PM  13 years agoPost 17
w.pasman

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Netherlands

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I usually end up replacing all bearings every 70 flights or so.
What, every 70 flights that would take 50 new bearings every month or so and a tremendous maintenance effort?

Do you put extra grease in the bearings, that might help prolong your bearing life. For me 'the greaser' works to extend their life at least a factor 4 on average.

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10-11-2005 09:42 PM  13 years agoPost 18
Yug

rrMaster

UK. Herts

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w.pasman

I only get time to fly at weekends so it's only every couple of months - usually after crashes. I allways pack bearings with grease.

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