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HomeAircraftHelicopterBergen R/C Helicopters › Tail rotor blade grip thrust bearing question...
02-16-2003 02:32 AM  15 years agoPost 1
coop

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Bainbridge, NY

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I have 2 Intrepids, both with the aluminum tail boxes. One of them, the one with the lowest time on it, has quite alot of movement of the blade grip in and out on the spindle, about a 1/16 of an inch on both grips. I have taken it apart to check the thurst bearings, everything looks fine, what I do see is too much clearance from the end of the shaft to the inner edge of the blade grip; when the bolt is tightened down, it does not put any pre-load on the thrust bearing, there is a gap, which is the looseness I see inward and outward of the grip. Is there a way to get rid of this clearence by a shim,(none in there now, missing?), or do I have to machine the end of the spindle down to get a closer fit? My other machine is tight, and when I had it apart to re-grease it, there were no shims in there, so I'm thinking either the bearings are different, or the spindle is shorter...Anybody got any ideas?.....Coop

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02-16-2003 11:00 AM  15 years agoPost 2
Al Magaloff

rrMaster

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

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Coop, take it apart, and see what's up. You don't need to shim or machine. p.s. keep our FunFly in mind, August, Performance Hobbies

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02-16-2003 11:46 AM  15 years agoPost 3
coop

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Bainbridge, NY

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I have had it apart, both helis, they both are the same, nothing is different between the 2, just more play in one than the other. I guess I can take them apart again and measure the overall length, end to end, of the spindle, also make sure the bearing shoulder area is the same length, I was just curious if anybody had seen this before and if there is a shim availiable. I can call Larry tomorrow, see what he suggests....Coop

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02-16-2003 12:08 PM  15 years agoPost 4
coop

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Bainbridge, NY

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I would not have thought anything about it, but I just bought the one that has the play, my other one is tight, no play at all. I suppose when the blades are spinning, the thrust bearings will always be loaded and there will be no play, I am more concerened about it for a balance issue, but again, I guess if you pull the grips out to to take up the clearance when you balance the assembly, that would assure the assembly would be balanced. I have a friend who has a gasser, he had the same thing, he machined some material off the end of the spindle so the blade grip bolt tightened down almost to the thrust bearing to eliminate the extra clearance, he has about .010 play now....Coop

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02-17-2003 12:47 AM  15 years agoPost 5
GMPheli

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W. Bridgewater, MA USA

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Coop:
I don't think it's anything to worry about. Like you said it is always going to be held tight and in the same place with centrifigal force. If it bothers you, you could make up some shims, or clean it up and green loctite (wicking 290) the inner races of the radial bearings to their shafts (while holding them in the extended position). I pretty much always Loctite bearings to their shafts. Makes dissasembly a little more difficult (heat and pullers), but I think the machine stays tighter, longer. You really have to be careful when wicking in the 290. Use a toothpick, and apply it to the shaft first, just above the bearing, and kinda work it (use gravity) towards the bearing with the toothpick. Once it hits it will wick right in. If you apply it right at the junction where the shaft and bearing meet, it is easy to get it in the bearings. You would probably only do the 2 inner most radial bearings cause you can get at them. Not sure how the Bergen metal tail grips are assembled.

Alan

P.S. Change of plans, I will be at the WRAM show on Sat. Maybe I'll see you there!

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02-17-2003 02:01 AM  15 years agoPost 6
Malorie

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Paw squared, MI

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Coop,
The end play is normal. There should be no balance issue as the way the tail hub is manufactured the ends of the shafts are very VERY close in length. It is normal to have some end play there. It will not matter ounce you spin it up.

Malorie

Life's a journey, NOT a destination.

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