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Home✈️Aircraft🚁HelicopterAlignT-REX 600N › One way bearing?
02-21-2016 09:20 PM  4 years ago
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Scud Runner

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miami, florida

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One way bearing?
How do I know when the one way bearing has failed on my trex 600n. It's the first generation
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02-21-2016 10:25 PM  4 years ago
JuanRodriguez

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The Villages, Florida

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Your head won't spool up properly under load .....and / or you can hold the main gear and rotate the head counter clockwise wi little or no resistance .....Been there, done that and old enough to know better.....
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02-21-2016 11:53 PM  4 years ago
Scud Runner

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Well the head does have a problem spoiling up. The clutch does ingage and Spins the bottom main gear but not the top one or the main head. I cannot hold the gear and rotate it counter clickwise
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02-22-2016 12:03 AM  4 years ago
JuanRodriguez

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Is it possible that your Jesus bolt is broken?? i.e., sheared ???? Remove it to make sure of its integrity .....Been there, done that and old enough to know better.....
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02-22-2016 12:12 AM  4 years ago
Scud Runner

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If that's the bolt that holds both main gears to the shaft it is GOOD. I removed both main gear that are bolted together. They only spin One way relative to each other. Does that mean that the one way bearing is good.
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02-22-2016 01:01 AM  4 years ago
JuanRodriguez

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Don't know .... The one way bearing ( also known as a sprague clutch) has a set of roller bearings that "lock" with rotation one way and "slip" when the rotation is the opposite way . Without seeing what yours is doing , it's hard to say what's going on .....Been there, done that and old enough to know better.....
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02-23-2016 07:25 PM  4 years ago
2LTime

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Walworth,NY

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Come on Juan! if this had been a Raptor 10 years ago you would have guessed the problem immediately. You must be getting old.

Scud,Your engine was running backwards. This will happen occasionally when starting it, especially if its set a little rich. Your main gear was spinning in the wrong/freespinning direction. Start it again and it's unlikely to keep happening.

Jeff
If you can't learn to do it well, learn to enjoy doing it badly.
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02-25-2016 02:27 AM  4 years ago
dkshema

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Cedar Rapids, IA

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The backwards running motor was going to be my suggestion, as well. A rich low end will cause this to happen.

If it happens again, take some time to look at the main gear and see which way it's turning. This would be a dead giveaway.

Slipping one-way clutches are hard to find manually. Best bet is to fire up the heli -- the blades may spin up, but not fast enough to produce lift. Or, if you get airborne, your motor will speed up (as the clutch slips) and generally you'll be losing lift. Not all of it, but enough to make you think something just ain't right.

You can also take a close look at the inner workings of the one0way clutch. If it's full of goo, give it a good bath in Automatic Transmission Fluid to get all the gunk out. Once you get it cleaned out, look at the individual "rollers" (they're not really "rollers", but the description works here), the springs, and the plastic cage under some decent magnification.

If all looks well, don't bother to add any lube to the one-way clutch. The ATF is all you'll need. Remember, this is a clutch, and when it's NOT locked up, the shaft is turning at a relatively low RPM and the surfaces are pretty smooth to begin with. You wouldn't think of lubing the clutch that's bolted to your motor, why would you lube the clutch that's making the main rotor spin?
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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02-25-2016 05:33 AM  4 years ago
Scud Runner

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Wow thanks guys. Yea I think it just started backwards. Now I have to put the damm thing back together. Thanks guys for the help.
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02-25-2016 10:28 AM  4 years ago
JuanRodriguez

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Come on Juan! if this had been a Raptor 10 years ago you would have guessed the problem immediately. You must be getting old.
Jeff,

Yes ! I am getting old !! You too, buddy !

Sometimes the simplest of solutions evades us all.....
Been there, done that and old enough to know better.....
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02-25-2016 01:49 PM  4 years ago
Four Stroker

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Atlanta

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http://www.nskamericas.com/cps/rde/...%20Clutches.pdf

Dave; Why are rollers not rollers ?

There is great confusion on RR about sprag clutches (not sprague, Vishay Sprague sells capacitors)like a 700N and drawn cup roller clutches like a 600N. In a generic sense, as a brake, a drawn cup roller clutch may be called a spraq bearing - although is has rollers and not sprags.
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02-25-2016 04:23 PM  4 years ago
dkshema

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Cedar Rapids, IA

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OK,

The typical one-way clutch found in most kits is a drawn-cup roller clutch.

They DO look a lot like needle bearings, and yes, the little guys that do the work are round, and they do roll, but only in one direction (the free-wheel direction). In the "lock" direction, they roll into a space that is a bit narrower than the free-wheel direction, and essentially get jammed and don't turn at all.

The rollers are spring loaded, and the small space in which they move is a bit tapered. This allows them to disengage the shaft (and turn) when turned in one direction, and to grab it when turned in the opposite direction.

The SPRAG (not "Sprague" as in the capacitor) clutch does not use needle shaped elements which can roll with limited movement inside a tapered slot, but instead the guys that do the work look kind of like a stylized figure 8 -- see below:

These guys don't roll, they are spring loaded, and pivot. In the free wheel direction (the shaft would be turning counter clockwise in the picture) the shaft is free to move -- the points of contact of the sprag would be the top left, and bottom right "corners". In the "locked" direction (the shaft would be turning clock wise in the picture) the sprags rotate slightly counter clockwise, and contact points would be top right, and bottom left. The sprags act like cams, not rollers.

Why a Sprag clutch over an drawn-cup roller clutch? You get more sprags in the same area (circumference) than you get rollers, and hence more torque capability. Why not sprags instead of drawn-cup roller clutches? Cost. Sprags cost more.

Hope that clears things up a bit.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-02-2016 08:37 PM  4 years ago
Helinige

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England

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700e one way bearing
Mine has just failed, not sure where to get one, Align only do a hub and bearing as one unit over the big pond . anyone any ideas?
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04-02-2016 09:18 PM  4 years ago
Four Stroker

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Atlanta

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04-03-2016 09:38 AM  4 years ago
Helinige

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England

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Bearing
Hi Thanks for reply, looked it up, but as of yet it's still available in the uk, I did how ever find out that the N9 one way is identical, but at $90.00 or more plus post I guess ill wait for them to com into to stock here.
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04-03-2016 01:36 PM  4 years ago
ICUR1-2

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Ottawa, Ontario

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I noticed on my 600n when the one way bearing fails it usually locks up instead of slipping. won't free wheel.
It can still auto rotate just fine because of the clutch.

The electric version does the opposite.
spending time, paying attention
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04-03-2016 05:49 PM  4 years ago
Four Stroker

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Atlanta

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Yeah, I auto'ed for two weeks before I discovered my bearing was locked up as well. Thick grease seems to essentially lock up your bearing anyway - like Thunder Tiger auto lube. BUT ATF or very thin oil really does add quite a bit at the bottom.

I found a 15x23x11 sprag once but can't remember where but it was a bearing house. The MA is also the same one. Unless the sprag has something visually broken or scored, it is probably not actually the problem. You might try cleaning it up and lubricating with ATF.
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04-03-2016 09:41 PM  4 years ago
Helinige

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England

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Mine never locked, just rotated in both directions, never spooled up even at 2100rpm idle up 2. I've found one over here but it was really expensive, bit my tongue at price but really had no choice as feeling my way back into hobbie after five years of absence and not another machine to fly. They are on back order here in the UK and it could be weeks,
Thanks for your support and help.

Nige
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04-03-2016 09:47 PM  4 years ago
Four Stroker

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Atlanta

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The common problem was that the entire bearing was rotating in the housing and NOT that the sprags were not locking up - red Loctite and set screws. Or better green Loctite shaft locking compound 6xx.
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