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HelicopterMain Discussion › Grip Bearing Arrangement
01-27-2013 03:31 AM  4 years agoPost 1
BobOD

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New York- USA

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Which would be a more efficient grip bearing arrangement?

Radial, Radial, Thrust
or
Radial, Thrust, Radial

And why?

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01-27-2013 03:39 AM  4 years agoPost 2
fastflyer20

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N. Tonawanda, NY

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Radial, thrust, radial will decrease the angular deflection since the distance between the radials is greater. I am not sure if it actually increases efficiency though.

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01-27-2013 03:42 AM  4 years agoPost 3
Stephen Born

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USA

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Which would be a more efficient grip bearing arrangement?
Radial, Radial, Thrust
Two radial bearings together?

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01-27-2013 03:57 AM  4 years agoPost 4
BobOD

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FYI, by efficiency of design, I mean highest strength in the most compact space.


And shown as they would typically be installed, viewed from the side.

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01-27-2013 03:57 AM  4 years agoPost 5
Dood

rrProfessor

Wescanson

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I'm just going to leave this here.
FYI, designed properly, both radial bearings have zero thrust loading on them. They handle pure radial load. And with the radials on either side of the thrust, the thrust bearing handles pure thrust load (unlike when the thrust bearing is at the end).
Radial / thrust / radial is far superior for very good reason. Of course the thrust load is not applied through the end radial bearing. That would indeed be a silly design.
Bob
Team POP Secret
These words come straight from BobOD in a PM dated 1/25/12.

Bob, are you finally starting to understand that I'm right and you're wrong?

The thrust bearing needs to go on the end, otherwise there is no point of it even being there!

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01-27-2013 04:00 AM  4 years agoPost 6
eddiscus

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Dumont, NJ-USA

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You left out needle, needle, thrust.

Logo Xxtreme 800
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Synergy 766
TDR 2

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01-27-2013 04:00 AM  4 years agoPost 7
Stephen Born

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USA

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FYI, by efficiency of design, I mean highest strength in the most compact space.
Ok. When I think of design efficiency of a bearing, it's all about smoothness and decreased heat, not strength.

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01-27-2013 04:19 AM  4 years agoPost 8
BobOD

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New York- USA

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Dood, I'm sorry but you are wrong here. I'm having trouble where you misunderstand me. In neither case does thrust load get applied to the radial bearings. In the radial/thrust/radial arrangement, the thrust from the grip transferes to the thrust bearing, then to the spacer, then through the inner race of the radial and then to the bolt head. It is not applying any thrust load between the inner and outer race of the radial bearing. I'll do a drawing to show you.

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01-27-2013 04:20 AM  4 years agoPost 9
Dood

rrProfessor

Wescanson

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If you're so sure I'm wrong, why did you start a thread asking the very question more than a year after the fact?

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01-27-2013 04:22 AM  4 years agoPost 10
BobOD

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New York- USA

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Ed,
I tried the needle bearing thing. They sucked. I was disappointed.

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01-27-2013 04:33 AM  4 years agoPost 11
BobOD

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New York- USA

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Am I asking because I do not know or because I thought others would like to consider the question?
Enough with attacking for Pete's sake. What's up with that around here?

MAN!

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01-27-2013 04:54 AM  4 years agoPost 12
ebonicrobot

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East Bay, CA

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Lol people get attacked for posting anything these days. I guess some people just need some entertainment in their life.

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01-27-2013 04:58 AM  4 years agoPost 13
Dood

rrProfessor

Wescanson

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I'll do a drawing to show you.
How's that picture coming?

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01-27-2013 05:02 AM  4 years agoPost 14
BobOD

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New York- USA

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Have a look at it with the grip. There is a shoulder in the grip that the face of the thrust bearing seats to. This shoulder applies the thrust load to the thrust bearing. The thrust bearing applies the load to the spacer. The spacer applies the load to the inner race of the radial bearing and the inner race of the radial bearing if seated against the bolt. There is no thrust load applied through the balls in this bearing.

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01-27-2013 05:09 AM  4 years agoPost 15
HeliOCD

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San Diego, CA

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Lol people get attacked for posting anything these days. I guess some people just need some entertainment in their life.
More likely there is to much false or shot in the dark logic being posted.

Its all earth!

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01-27-2013 05:13 AM  4 years agoPost 16
Dood

rrProfessor

Wescanson

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you still don't get it.

You can't have a radial bearing at the end. It needs to be a thrust bearing..

A grip is held onto the shaft with a single screw and a thick washer. If you have a radial bearing on the end, where do you think that screw and washer makes contact with the radial bearing?
The inner race of that radial bearing.

Meanwhile, the outer race (and all the mass behind it AND the entire weight of the blade) would be slung outwards. How effective do you think that radial bearing is on the end when the inner race is pressed inwards and the outer race is slung outwards by an opposing force?

Not very effective.

Once you understand this, you will understand why you're wrong and why a thrust bearing NEEDS to go on the end.

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01-27-2013 05:20 AM  4 years agoPost 17
BobOD

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New York- USA

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How are you missing that the shoulder on the grip is applying the thrust load through the:
thrust bearing to the spacer to the inner race to the bolt.

The grip isn't getting slung anywhere. I can't see what you are missing about it. I'm not meaning to be rude or anything, I just don't see what you are missing. It works as I have described I assure you.

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01-27-2013 05:23 AM  4 years agoPost 18
HeliOCD

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San Diego, CA

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You can't have a radial bearing at the end. It needs to be a thrust bearing..
+1

Its all earth!

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01-27-2013 05:26 AM  4 years agoPost 19
Dood

rrProfessor

Wescanson

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I can't see what you are missing about it
you're not seeing a lot of things.
That shoulder is there to keep the bearings from sliding all the way through the grips. without it, the grips would go flying off.

The outermost bearing in the assembly is the single most load bearing component in the assembly NO MATTER WHAT!!
How come you still don't understand that bearing CANNOT be a radial bearing?

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01-27-2013 05:30 AM  4 years agoPost 20
nobato1

rrApprentice

USA

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how bout needle roller needle?

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HelicopterMain Discussion › Grip Bearing Arrangement
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