Shattered RCM Pinion

[Arct1k]

I know I had spinach for lunch but I was just tightening up the set screw and it shattered!



Anyone else had this problem - It was a 22T 5mm 32p... thanks

[suicideneil]

Vandal.

Im hoping this was just one of those rare things caused by a flaw in the metal, since I have 20 and 24t pinions waiting to be used...

[magman]

I have changed and run RCM pinions several times on my buggy w/ no probs.

[TexasSP]

Could be a bad piece of metal, or improper cool down during heat treat. I wouldn't read too much into it though. I would holler at mike and see what his take on it is though.

[joeling]

wow, u are one strong dude ! I think it's the metallurgy. Mine (a 13t) has seen more than 1hr of hard usage without any problems.

Regards,
Joe Ling

[RC-Monster Mike]

I would guess that that pinion is from an older batch - this is the 2nd one I have seen, actually(1st one was a smaller gears with a smaller "shank area") - the other was also a 32p from an early batch - from what I gather, the batch was actually over-hardened and caused some embrittlement - send it back and I will replace it. I thought I had filtered them all out (I put the kung-fu grip on the set screw on the batch that had the problem and threw away the ones that shattered), but a few likely got through before I realized the problem.
:)

[RC-Monster Mike]

Sorry for that as well, Chris. :)

[Arct1k]

Dam and I thought my work out schedule was paying off... Mike thanks for the offer - Hopefully I'll be ordering some stuff soon for a hyper ST conversion (I need to do something to try to keep with you...)

I have a 22T that I can use for now - it doesn't make sense for you to pay shipping on a single pinion ATM. We have to look after your commercial interests....

You can't by any chance get me a cracking price on a Hyper st?

[TexasSP]

Originally Posted by RC-Monster Mike

from what I gather, the batch was actually over-hardened and caused some embrittlement

It happens to the best sometimes. I had some of my guys do that before on several thousand (factoring in material and labor) worth of parts and it sucks.

[RC-Monster Mike]

yep - it sucks indeed, Texas. I was over it and absorbed the loss - until Chris had to bring it up again! :)

I will look up the Hyper - RTR or the pro kit? :)

[Arct1k]

Pro of course - cough cough...

[lincpimp]

I had the same issue with a 20t 32p 5mm bore pinion, however enough of the tapped hole was left and it has not come loose yet. I figured that I had cross-threaded the set screw, but was suprised when it cracked. Can't win them all...