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Ark › Poor gear mesh between main gear and tail counter gear
03-09-2006 04:27 AM  11 years agoPost 1
WeatherB

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Toronto - Canada

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Hi Guys,
I'm having some problems with the gear mesh between the main gear and the tail counter gear (the gear that drives the tail pulley).

The mesh it too tight at the highest point causing binding.

Anyone have this problem? What's the best way to resolve it?

Getting another gear won't help either since both my MX400 and X400 have this problem.

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03-09-2006 06:29 AM  11 years agoPost 2
Terry1229

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North Idaho

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The best thing to do is replace both white gears...............

Maybe try loosening the screws holding the bearing blocks, 16 screws,
[8 screws for the main shaft, and 8 for the tail drive shaft]
while every thing is mounted and see how it feels.

Thanks: Terry

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03-09-2006 12:34 PM  11 years agoPost 3
WeatherB

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Toronto - Canada

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I was thinking of holding some sand paper against the gear while it is turning so loosen up the gear mesh.

I've tried three sets of main gears (both gears) and 2 sets of counter gears. They all have the same problem.

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03-09-2006 12:54 PM  11 years agoPost 4
jrohland

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Arlington, Virginia, US

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The Ark/Helimax are not very round

Disapointed with the poor quality of the Ark/Helimax main gears, I bit the bullet and got the MicroHeli gear (click the picture to link to the MicroHeli page):

The quality is excelent. Plus, it is kind of fun (if slow) getting mail from Vietnam.

Anyway, I'm thinking you might have bent main shafts on both your models. I've heard they can bend.

jrohland

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03-09-2006 01:52 PM  11 years agoPost 5
WeatherB

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Toronto - Canada

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jrohland,

Unfortunately my problem is with the tail drive portion of the gears (and not the main gear as I can adjust the mesh of the motor).

Also, I seriously doubt it is a bent mainshaft as one of the models were brand new and the other I had just removed the shaft and it slide through the bearings no problem.

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03-09-2006 01:53 PM  11 years agoPost 6
skeppley

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Auburn PA

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Hey WeatherB,
There is a very simple fix for that. I originally had though of slotting the holes that hold in the tail drive pulley to allow it to slide front and back, and then this easy method hit me:

You simply drill all the holes in the frame that hold the tail drive assembly with a bit 1 size larger. I will go home at lunch, and let you know exactly what size bit i used. It allows the tail drive to move back just a hair, and this loosened up the gear drives on all my helis nicely. When your tightening it up, just be sure to keep the tail drive assembly pulled rearward.

Simple and works great!

Shane

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03-09-2006 02:04 PM  11 years agoPost 7
WeatherB

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Toronto - Canada

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Thanks Skeeply. I'd hate to drill holes in my 'new' carbon frame but the mesh problem is driving me insane.

Please let me know the size of the drill bit.

Thanks again for everything

P.S. I saved about 18 grams by using your frame.

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03-09-2006 02:14 PM  11 years agoPost 8
skeppley

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Auburn PA

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That CF frame sure looks nice. It is light and VERY rigid. Glad you like it. I would drill with very light pressure on the CF frame, just to be safe. Drilling the Aluminim was simple. Just be CAREFUL..
I'll get you the bit size in 4 hours.

Shane

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03-09-2006 02:31 PM  11 years agoPost 9
WeatherB

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Toronto - Canada

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Awesome. Thanks!

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03-09-2006 05:59 PM  11 years agoPost 10
skeppley

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Auburn PA

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Ok.
I used 3/32 bit.
Not sure what that is in metric though.
You could probably go up to a 7/64th if you had to, but i would definitely use the smaller first and see if it eases the gear mesh. The bigger bit may make things too sloppy.
Dont forget to drill the 2 holes in the lower frame too, where the small aluminum standoff attaches so those screws can move a bit also.

Shane

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03-09-2006 09:46 PM  11 years agoPost 11
BikeNBoatN

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Santa Ana, CA USA

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This is a nice idea that I was thinking about to correct a different problem. If you move the tail shaft around, be sure to keep it parallel so that the belt rides in the center of the pulley. If you have the shaft tipped, the belt will ride on either the top or bottom of the pulley and wear out prematurely.

I may do this because my belt does not stay centered on the pulley.

Brent.

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03-09-2006 09:50 PM  11 years agoPost 12
WeatherB

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Toronto - Canada

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Thanks all... I will give this a try when I get home.

P.S. 3/32 is 2.38mm

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03-10-2006 12:05 AM  11 years agoPost 13
WeatherB

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Toronto - Canada

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Worked perfectly. Thanks Shane!

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Ark › Poor gear mesh between main gear and tail counter gear
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