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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › linear bearings ??
06-17-2009 09:05 PM  11 years ago
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JEEPWORLD2002

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BLUEBELL PA USA

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linear bearings ??
i ve been researching linear bearing as a replacement to our main shaft bearings. and get a new age tech working for us. and seeing they re longer may hold up to the stress that our helis put on bearings. what do you all think ? here is a link to one i found

http://www.vxb.com/Merchant2/mercha...arMotionSystems
Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
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06-17-2009 09:13 PM  11 years ago
TaleGunner

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Deer Park WA

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try em out and let us know how they work.CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2
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06-17-2009 09:17 PM  11 years ago
JEEPWORLD2002

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I forwarded the link to some one who will be tring it out in a prototype. what the best thing is the load features they can take loads big ones Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
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06-17-2009 09:22 PM  11 years ago
Leif

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What "linear" movement do you have on your mainshaft? Mine is pretty much static in the linear direction.

Those bearings are for linear sliding action, not rotation. What you really want are roller bearings.

Leif
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06-17-2009 09:56 PM  11 years ago
VooDooX

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linear=in and out

we need rotary bearings
Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001
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06-18-2009 12:01 AM  11 years ago
misfits0311

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Santa Clarita, CA - USA

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Balls are round right? They don't care which way they roll. Linear or radial, the only difference in this application would be RPM at which they spin. It the bearing can handle the speed, then one would suppose that the fact they can move up and down as well as radially would help reduce stress and vibration. I'm sure it would lenghten the life of the bearing as well. I say go for it. The worst that could happen is that they don't last and you waste 12 bucks, let us know. BTW, it's thinking problems like this through that helps progress our hobby. The world was once thought of as flat too. Good Luck.╘ₒ₲ₒ 6°° ƺƉ ṾЪ∂®
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06-18-2009 02:27 AM  11 years ago
stocky

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Taxachusetts

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The linear bearings shown in the link are not suitable for rotary motion. This bearing is a reciprocating ball linear bearing and designed for a shaft to move through it allowing the balls to rotate and move along the internal linear track, you can see the ball return on the outside of the bearing. Using the linear bearing for main bearing replacement with rotary motion the balls will in effect contact a single point on the outer race and will wear and fail very quickly.

A better choice of bearing would be a taper roller bearing to counter the forces applied to the bearing by the main blades "pulling" on the bearing during flight.

http://www.ntnamerica.com/datasheet...ARTNO=4T-30302&

Better still a double opposed taper roller bearing that would provide for inverted as well as normal forces.

http://www.ntnamerica.com/datasheet...CL_PARTNO=452D&

The links are for example only and too big for out heli use, you will need to Google for miniature taper bearings, but I do know that these are available in 5mm ID 10mm OD rated at 40,000 rpm with oil lube.
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06-18-2009 02:30 AM  11 years ago
Furious Predator

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Kitchener, Ontario, Canada

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Balls are round right? They don't care which way they roll. Linear or radial, the only difference in this application would be RPM at which they spin
please do everyone a favor and stay in school. or go back, which ever.
Shawn
Team Leisure-Tech
Team HelixRC
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06-18-2009 02:38 AM  11 years ago
gian

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AZ

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http://en.wikipedia.org/wiki/Linear_bearing

It's in the title of your thread.
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06-18-2009 04:35 AM  11 years ago
misfits0311

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Stocky:

Thanks for the information.

Furious Predator:

If you are going to insult a person that is voicing his opinion, please try to exercise proper use of sentence structure and grammar. Please allow me to explain.
please do everyone a favor and stay in school.
The first word in a sentence is always capitalized.
or go back, which ever.
Once again the first word in a sentence is capitalized. In English, sentences have nouns and verbs. Please refrain from using incomplete sentences. By the way, "which ever" is one word (i.e. whichever).

I went to school. They taught proper English as well as a skill known to academia as proofreading. You apparently know the ins and outs of bearings; that’s great. But it is obvious that they did not teach you any manners in school. You’re rude and discourteous for no reason. It would seem that you did not get enough hugs as a child. Therapy will set you free from anger that eats you up inside.
╘ₒ₲ₒ 6°° ƺƉ ṾЪ∂®
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06-18-2009 04:29 PM  11 years ago
VooDooX

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wow this is a forum not English class. don't try to cover for your lack of brainpower by posting some absurd spellchecker, and completely ignore the fact that you had absolutely no clue what you were saying. its people like you that cause accidents. the bearing is NOT rated for rotary motion, if you look at it you will see how. OBVIOUSLY you wont so let me explain it to you ... imagine the bearing as a conveyor belt. conveyor belts move ONE WAY unless there fancy, but lets not get into that. basically the balls are a little below the surface, and on a looped track. as the item goes over the balls it moves the ball to the end of the track, and the ball submerges. as it does move its pushing all the submerged bearings back to the beginning of the track, and the cycle repeats. HOW THE HELL is that supposed to be converted to rotary motion. i would say some more things but ill get in trouble so your lucky. o and feel free to spell check me as a comeback. WHY? because i don't care.Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001
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06-18-2009 05:50 PM  11 years ago
Swoop

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Newark, DE USA

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+1 for stocky's advice.Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35
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06-18-2009 06:00 PM  11 years ago
misfits0311

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Thanks to everyone that posted helpful information. It sounds like linear bearings can only be used for their intended purpose and can't handle rotary motion. But, to post this:
please do everyone a favor and stay in school. or go back, which ever.
without any prompting is malicious. I didn't fully understand linear bearings, to that I can admit. But I'm not an a$$ right off the bat to someone I don't know. I could understand backlash if I came at him personally but I did not. I thought the guy had a good idea to try different bearings. Anything we can do to make our helis better is beneficial to everyone. Now I know, and knowing is half the battle. That's what G.I. Joe said. Can't we all just get along?
╘ₒ₲ₒ 6°° ƺƉ ṾЪ∂®
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06-18-2009 06:05 PM  11 years ago
TaleGunner

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Deer Park WA

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This sure went south quick, don't know why? someone was just thinking outside the box sometimes that works but not always.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2
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