terrible grinding sound - RC-Monster Forums

ReV:-O · **terrible grinding sound -** 12.23.2009, 09:59 AM

hiya,

i just bought a mod1 14T pinion for my converted hyper 8, but theres a terrible grinding sound between the pinion and the center diff, and theres a lot of friction. They are both mod1, so shouldnt they mesh? i've set the mesh correctly and there is a fair bit of play in between the gears. I dont know what else to do?

any help greatly appreciated!

brushlessboy16 · 12.23.2009, 12:13 PM

there should be very little play between the gears. thats where the sound is most likely coming from.. i mesh my gears by hand. But there should be a very tiny amount of actual play between the gears- just enough to make a small "tink" noise between the gears.

ReV:-O · 12.23.2009, 04:04 PM

i tried different positions ranging from a lot of play to none at all, and it still grinds really badly no matter the position. is it possible the spur is like mod0.9, or mod 1.1 or something?

What's_nitro? · 12.23.2009, 04:22 PM

Are you sure it isn't the front motor bearing?

t-maxxracer32 · 12.23.2009, 05:04 PM

you should be able to rule that out by free revving the motor. --revving it whilst not touching the spur gear--

brushlessboy16 · 12.23.2009, 05:09 PM

Quote:

Originally Posted by ReV:-O

i tried different positions ranging from a lot of play to none at all, and it still grinds really badly no matter the position. is it possible the spur is like mod0.9, or mod 1.1 or something?

no- i have run this setup..

check motor bearings, check diff bearings

ReV:-O · 12.23.2009, 05:25 PM

the motor runs freely. the drivetrain runs freely. the only thing grinding is the pinion and the spur. i might try and make a video of it

suicideneil · 12.23.2009, 05:36 PM

Bizzare. Only thing I can suggest really is to remove the pinion, and run it around the outside of the spur with your finger- if it jumps teeth and doesnt stay in constant mesh tehn its not the same pitch as the spur...

jokerjustin · 12.23.2009, 05:36 PM

metal gears tend to sound like that.. i know my mod 1s do

brushlessboy16 · 12.23.2009, 05:47 PM

Quote:

Originally Posted by jokerjustin

metal gears tend to sound like that.. i know my mod 1s do

no- my mod1 gear sare relatively quiet

ReV:-O · 12.23.2009, 06:31 PM

Quote:

Originally Posted by suicideneil

Bizzare. Only thing I can suggest really is to remove the pinion, and run it around the outside of the spur with your finger- if it jumps teeth and doesnt stay in constant mesh tehn its not the same pitch as the spur...

it seems to fit just fine when i roll it round with my finger.
its really weird lol

i should hav just bought the damn vorza instead of attempting to convert a buggy

BrianG · 12.23.2009, 07:00 PM

Where did you get the pinion? Some pinions are designed specifically for plastic spurs, but will catch and get chewed up when on a metal spur.

ReV:-O · 12.23.2009, 07:07 PM

hiya i bought this one http://www.modelsport.co.uk/?CallFun...n&ItemID=34365

BrianG · 12.23.2009, 08:50 PM

Hard to tell the shape of the tooth from the pic, but see the pic below. The one on the right is meant for plastic spurs only and roll very rough on steel spurs. The one on the left is meant for any spur, metal included. It's about the shape of the tooth. Not sure if this what you're talking about, but something to look at. Maybe a pic or a movie so we can hear how is sounds would help.

ReV:-O · 12.23.2009, 09:01 PM

oh dang i never realised that! looks like i just wasted money on 2 pinion gears (this is the other one i bought that hasnt come yet http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWNX:IT)

the gear on the left is a clutchbell, can you get pinion gears like that? is there something special that they are called or is the only way of telling by looking at the pic?

cheers