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Other › My trex 450 is chewing maingears!? Why?
11-21-2006 03:56 AM  11 years agoPost 1
bparro

rrVeteran

indianapolis,in

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In the last 6 or 8 flights I have stripped 3 maingears! One was a white one and the others two were blue gears. First time it was a chaos, after about the 5th revolution the gear stripped. The other time was a 4-point tic-toc. The last time was just a nice smooth backwards snake. This is getting very frustrating Anyone have this happen to them and resolve it? thanks

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11-21-2006 04:23 AM  11 years agoPost 2
flyride

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Salt Lake City UT

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How is your gear spacing?When you put the gear in do you use a piece of paper between them and push them together tight then remove the paper this should give you perfect mesh of gears.I sounds like the gear train is a little loose and allowing the gears to strip from improper gear mesh(more stress on the tips than on the whole gear tooth) or maybe your motor is moving slightly to mess with the mesh.I had a gear get chewed up fast from bad gear alignment.

and the blonde said "RECTUM, Hell damn near killed em!!"

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11-21-2006 04:33 AM  11 years agoPost 3
bparro

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indianapolis,in

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Well, the gears are never totally round. I set the mesh tight at the high spot. I think I need to just take it apart and look for the problem

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11-21-2006 04:36 AM  11 years agoPost 4
flyride

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Salt Lake City UT

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Is the motor moving back in the mount allowing space between the gears

and the blonde said "RECTUM, Hell damn near killed em!!"

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11-21-2006 04:48 AM  11 years agoPost 5
Remyrw

rrApprentice

Bloomfield, CT - usa

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microheli solution
Assuming your motor isn't moving and you're able to set proper gear mesh as long as the gear is actually round, get the microheli green main gear. GREAT upgrade. Not only is it a much better piece of machinery but you don't have the usual bs with the one way. it's not cheap for the first one, but on the other hand it's very well made and you can buy just the gears for replacements if you do strip one, no need to fart around with trying to get the one way out and messing it up half the time.

Some folks have said they're louder, some quieter. Mine is about the same volume but a more low pitched sound. It has more of a growl than a whine. The motor whine's in there but the overall sound is different for the gear. I wish it wasn't christmas green, but overall I coudln't be happier with mine.

Now if I had just bought gorilla gear instead of the black plastic ones from align after my last crash. It was chilly out today and I guess they got a bit cold. One little bump when the wind changed during a touch and go landing and one side cracked off right at the point the skid connects. I'll glue it back together but they need replaced and I won't make the same mistake. Either metal or the gorillas this time.

Remy
Practice in a sim, or it's practice fix practice fix...

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11-21-2006 05:00 AM  11 years agoPost 6
whirlybird 1

rrApprentice

flatwoods ky U.S.A.

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main gear
Had a similar expirence whith my first flight. Wore 1/4 Hight of the gear teeth off. Had to tighten the gear mesh up tight to keep gears from skipping.
Dont know if the screws loosened during flight but repositioned gears tightened screws and flew again. No more problems.

Blade Cp 11.1 lipos ugraded chassie bell-hiller dual tail motor /T-Rex SA Upgrading to SE

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11-21-2006 05:15 AM  11 years agoPost 7
TMoore

rrMaster

Cookeville, TN

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You have to set the Align gears just on the ragged edge of being too tight. Paper will set the backlash too loose. The backlash for gears of this Module is very small. The MH gear is a good gear but not for the Align pinions as the minor diameter is too great on the Align pinions so getting a tight but free running mesh is very difficult. The Ikarus pinions or the Robinson pinions are really nice and fit much better than the stock Align units.

I haven't done any measuring as my gear verniers won't measure gears this small. This is just my observations.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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11-21-2006 05:17 PM  11 years agoPost 8
bparro

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indianapolis,in

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Ok, I will set it tight this time. I looked at my gear stash and I have only 2 left so I actually ate through 4 blue gears in about 10 flights. I can really punish my 90's and I only have to buy parts if I crash it. I know it is possible to fly the trex hard without failure but... I will let you guys know what happens.

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11-21-2006 05:20 PM  11 years agoPost 9
bparro

rrVeteran

indianapolis,in

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Remyrw,
I can say that the gorilla gear have held up great! The last crash the landing gear pancaked hard and did not break.

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11-21-2006 05:21 PM  11 years agoPost 10
bparro

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indianapolis,in

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Hey Tmoore, should I set the mesh tight at the low spot?

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11-21-2006 05:56 PM  11 years agoPost 11
TMoore

rrMaster

Cookeville, TN

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I would try to average it out. If you set it tight at the high spot it will depend on how much the gear runs out.

I set it and then spin the gear backwards until it feels right. You can tell when the mesh is solid. Try to get a feel for it.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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11-25-2006 03:24 AM  11 years agoPost 12
bparro

rrVeteran

indianapolis,in

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I found my problem
I repaired the heli and put in a new blue gear. This time I set the mesh on the tight side. I went out and flew it pretty gently for a few minutes doings rolls and flips, seemed OK. I started to do a slow aileron tictoc and it stripped again This time I managed to only strip the gear and no other damage, I thought When I looked alittle closer I saw that the servo case on the pitch channel was cracked! This was a brand new 65MG servo. I looked at the gear and there were some chips out of it on the top fan side. The servo arm was hitting the gear in flight Man I feel stupid. Fixed it up again and had 2 hard flights on it today and it seemed ok. Chaos and piro tictocs didnt strip it. I think I need to test it more. thanks guys

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