Belt slipped off

[rdlohr]

Originally Posted by jrman83

Checked my pinion height...if I look at the pinion and where the grooves start and stop, my belt crosses almost exactly in the middle of that area. This is good, right? The motor shaft sticks up above the pinion about 3mm.

I'll check the 3mm part tonight. I believe the intent is to have the flat section of the pinion, which is above the transition from perfectly round to geared, line up with the pulleys.

On mine it looked like the belt was partially riding on that transition section which likely caused it to wear and look ratty.

Rick

[rdlohr]

Originally Posted by learnedthehardway

Interesting, 16t dropped right in on mine. Pulled off and tossed the bearing eating Y support bracket and the pinion slid on with ease.

Hmmm, maybe I should also toss the Y. I was a bit concerned that it is causing undue stress on the motor anyway. I assume its intent was to hold things in place with the original OWB that I replaced with a hard pinion.

Rick

[learnedthehardway]

Yeah was there because the pinions with a owb don't have a grub screw while the solid pinion has 2.

Getting rid of the owb plus the y support and its little bearing greatly reduced the cost and frequency of maintenance, pretty much eliminated it.

At least it seems that way so far. Went through 2 Y support bearings and a owb in around 50 flights, close to 200 trouble free flights since installing the solid pinion and chucking the Y support.

If the pinion screws still hit the bolt heads, maybe a couple pan head style bolts will give you enough clearance to use 4 bolts to hold the motor?

[rdlohr]

Originally Posted by learnedthehardway

Yeah was there because the pinions with a owb don't have a grub screw.

Getting rid of the owb plus the y support and its little bearing greatly reduced the cost and frequency of maintenance, pretty much eliminated it.

At least it seems that way so far. Went through 2 Y support bearings and a owb in around 50 flights, close to 200 trouble free flights since installing the solid pinion and chucking the Y support.

If the pinion screws still hit the bolt heads, maybe a couple pan head style bolts will give you enough clearance to use 4 bolts to hold the motor?

Good thought. I'll look around for some.
Rick

[learnedthehardway]

Originally Posted by jrman83

Checked my pinion height...if I look at the pinion and where the grooves start and stop, my belt crosses almost exactly in the middle of that area. This is good, right? The motor shaft sticks up above the pinion about 3mm.

Sounds right to me but I don't have anything to measure how much mine sticks out atm. As long as it rides above the shred zone with a little buffer you should be fine.

[rdlohr]

Originally Posted by jrman83

Checked my pinion height...if I look at the pinion and where the grooves start and stop, my belt crosses almost exactly in the middle of that area. This is good, right? The motor shaft sticks up above the pinion about 3mm.

Mine is definitely over three, maybe closer to 5. I'll measure it when I yank the A frame. Had to work on a big order tonight so I didn't have any wrench time.

Rick

[Mikej]

Rick
Any chance of a pic of your pinion height - it doesn't sound right. Mine rides small in the middle of the solid pinion.

The pinion is sitting on the shoulder of the motor shaft properly isn't it is the pinion should slip over the shoulder.....
Cheers
Mike

[rdlohr]

Originally Posted by Mikej

Rick
Any chance of a pic of your pinion height - it doesn't sound right. Mine rides small in the middle of the solid pinion.

The pinion is sitting on the shoulder of the motor shaft properly isn't it is the pinion should slip over the shoulder.....
Cheers
Mike

Thanks Mike. I'll try to post before and after pictures tonight.
Rick

[jrman83]

Originally Posted by rdlohr

Mine is definitely over three, maybe closer to 5. I'll measure it when I yank the A frame. Had to work on a big order tonight so I didn't have any wrench time.

Rick

After actually getting into it and measuring, mine is closer to 5mm as well. Can't really get a micrometer in there, but that is very close.

[Aryemis]

Originally Posted by rdlohr

To lower the pinion, I had to drill it out to allow it to go further onto the shaft. Then the set screws in the pinion started hitting two out of the four motor hold down screws so I removed them. Not too happy holding down the motor with only two screws. Anybody else play this game?

Rick

The Gaui X3 (designed for way more power than the mini prôtos) holds the motor with 2 screws, so I'd guess it would be fine on the mini prôtos.
The motor mounts look pretty similar too : http://www.gaui.com.tw/product/x3-bo...-mount-silver/

As for the pinion height, I use a warp 16t pinion which is much larger so I can't really relate to the issue (also it's a 4mm shaft so no A frame).

[rdlohr]

Originally Posted by Aryemis

The Gaui X3 (designed for way more power than the mini prôtos) holds the motor with 2 screws, so I'd guess it would be fine on the mini prôtos.
The motor mounts look pretty similar too : http://www.gaui.com.tw/product/x3-bo...-mount-silver/

As for the pinion height, I use a warp 16t pinion which is much larger so I can't really relate to the issue (also it's a 4mm shaft so no A frame).

Thanks Aryemis. I was thinking similarly on the two screws.
Rick

[Mikej]

Rick,

I snapped a couple of shots of my M-P with the solid pinion..





And one of the 15T pinion that I replaced with a 16T recently - you can see where the belt was running



Cheers,
Mike

[learnedthehardway]

The bottom of the 16t Lynx solid pinion on
mine just clears the top of the motor mounting bolts which have a larger socket style head than most.

I think Mikej is onto something about yours possibly not being oriented on the right part of the shaft. Especially since you mentioned the screws in the pinion hitting the screw heads, mine are recessed in the pinion.

Don't have a micrometer but it the shaft only sticks out of the top about 3mm, pretty much the thickness of the shaft is how far it sticks out.

[rdlohr]

You can see by the slight line on the pinion that the belt used to run much lower on the pinion.






Notice at 3:00 you can see where the grub nut would have hit the hold down screw that is now removed.

[oliver1071]

Man any place in the US to get the 16T pinion? Seems a little ridiculous to pay $15 shipping direct from lynx.
I'd like to swap out this awful oneway pinion design and ditch that Y support.

[jrman83]

I have a 17t.

[Mikej]

The head of my grub screws sit lower than the rest of the pinion - nothing sticks out the side of the pinion to hit the screws.

Are the grub screws tight? if not it could explain why the heads sit proud and the pinion has moved...

[rdlohr]

Originally Posted by Mikej

The head of my grub screws sit lower than the rest of the pinion - nothing sticks out the side of the pinion to hit the screws.

Are the grub screws tight? if not it could explain why the heads sit proud and the pinion has moved...

Yes, they were tight. It was just too high. So tight now that I stripped the head on one of them so its going to be a pain if I ever have to remove it.

Rick

[rdlohr]

Originally Posted by oliver1071

D) you fly so badass that the model just couldn't hold up

Man autoed a mini impressive. My belt just snapped because of that damn one way bearings seizing wrapped around the head and fell from the sky.
I need to pick up that Lynx pinion thIs one way is garbage.

I finally got around to putting on the new belt. As I spun the head without a belt and it spun like a top, I thought about this post and the kudos you gave me that I really did not deserve. Without a belt that head was bound to auto forever. But thanks anyhow for the nice words.

I'll maiden the repair job tomorrow weather permitting. Everything seems nice and smooth and I don't miss the A support even a little. Thanks for all the help everyone. I always feel more confident in a fix after hearing from so many people.

Rick

[oliver1071]

Originally Posted by rdlohr

I finally got around to putting on the new belt. As I spun the head without a belt and it spun like a top, I thought about this post and the kudos you gave me that I really did not deserve. Without a belt that head was bound to auto forever. But thanks anyhow for the nice words.

I'll maiden the repair job tomorrow weather permitting. Everything seems nice and smooth and I don't miss the A support even a little. Thanks for all the help everyone. I always feel more confident in a fix after hearing from so many people.

Rick

jrman83 hooked me up with a 17t what a guy gotta love heli freakers what a great bunch of people to just sent you a part for nothing
Can't wait to try it out and get rid of that one way.