Pinion splitting?

[helicraze]

I have noticed on my logo 600 the 2 pinions i tried look like they may be splitting? There is a gap, very very tiny where i can see light, only a little. Is this an idication that it may split?
Reason i ask if because the logo 500 has no split at all and also i am worried it may fail mid air.

[helicraze]

anyone?

[Griffo]

Let the search engine be your friend

http://www.helifreak.com/showthread.php?t=74815&highlight=pinion+split

[helicraze]

Hi i read that one but didn't really have the info. I am wondering if the tiny tiny gap is an idicator or if i should not worry.

[Klinger]

Mate, if you got a small gap take the opportuninty to wick in some high strenght red or green loctite and simply bang it back together. I've had a small gap appear and turn into a bigger one stripping teeth!

[helicraze]

Alright my 13 and 14T pinion definently had a small split, one even had one of the pins coming out.
Kinda disapointing seeing as each one only did about 5 flights with a Z50 motor in my logo 600.
I used loctite 290 green and gently tapped it back together, it didn't take much force. I also used some good super glue over the pin hoping it may help.
Time will tell if its successful.
I will get the new laser welded pinion if any more dramas, may also just get a actro 24-3 too!

[Jafa]

I'm confused with Loctite 290
In my local shop it's listed as low strength
JohnB says 290 is correct for fine threads and it seems to work well
But think it's not the correct one to use to hold the pinion together

I would rather get somebody to zap it with some sort of arc welder
I've seen other pinions tagged down like that - just needs a spot
(depends what metal it's made out of course)

[helicraze]

Its medium strength low viscosity for post assembled items. Is resistent to shock loading, vibration and temp cycling and good for sealing of welding or porosity.

So yes its seems this is the most suited one. If the pinion could be removed and re-pressed together then i would use another loctite product but as its already assembled and only a tiny .05MM split the other 243 or 262 will not work.

[helicraze]

I will not get it welded as its not 100% successful. I will wait for the new laser welded pinions from perth RC or if i ever had the need i would send it off to get EB welded.

[Klinger]

We may as well had this thread on arc, all aussie thread. TIG welding would be the way to go unless you've got 1/4 million dollar laser up your sleeve. I'll get some guys to try it, only requires a small spot or two, i'll get them to do it with the pinion on a shaft so there's little chance of it deforming!