Stripped my Spur gear, why??

[Antoine]

I have just run 2 x 3s in my emaxx brushless for the first time.

I have the stock MMM combo set up and it is running a stock 17 tooth Pinion gear along with the stock 68 tooth Spur.


The spur burnt out within 5 minutes, why?

I notice that although the pinion is steel the spur gear is plastic why???

What is the point of putting rubbish plastic gears in a car worth $600????

Cheap and nasty!!!

Can anyone tell me what spur I should be running with the 17 tooth pinion so as I dont burn out the spur again and also if anyone knows where I can get a metal spur for the Emaxx instead of the plastic rubbish supplied?

Thanks

Antoine

[arvint]

You want plastic there..if it was metal, itll take the impact to the pinion, which will put stress on the motor, and it could be a rock got in, or the grub screw on the pinion is a little loose..mine has lasted me 1 month(only had it for a month)..which is why alot of companies prefer plastic spurs over metal. The spur is supposed to be the stress reliever of the metal drive train IMO.

[ksb51rl]

I have just run 2 x 3s in my emaxx brushless for the first time.

I have the stock MMM combo set up and it is running a stock 17 tooth Pinion gear along with the stock 68 tooth Spur.


The spur burnt out within 5 minutes, why?

I notice that although the pinion is steel the spur gear is plastic why???

What is the point of putting rubbish plastic gears in a car worth $600????

Cheap and nasty!!!

Can anyone tell me what spur I should be running with the 17 tooth pinion so as I dont burn out the spur again and also if anyone knows where I can get a metal spur for the Emaxx instead of the plastic rubbish supplied?

Thanks

Antoine

I think the first thing you need to do is calm down. The plastic spur gear is there to prevent catastrophic failure of other, harder to replace, and more expensive parts (internal gears mostly.) There is nothing improper or substandard about it. Your characterizations are not appreciated.
The most common cause of stripped spurs is improper pinion/spur mesh. This is not to say that someone can't set the mesh correct, but mesh CAN change due to the motor slipping from impacts, a bent motor plate, etc.
However, if you want to increase the strength of your external gears at the possible expense of other parts, I know Integy and Hot Racing make steel spurs. They make a different noise, but work well, and are actually easier to set mesh with, at least they were for me.

[makaveli72]

I have just run 2 x 3s in my emaxx brushless for the first time. I've been running 6S.

I have the stock MMM combo set up and it is running a stock 17 tooth Pinion gear along with the stock 68 tooth Spur.

The spur burnt out within 5 minutes, why?
Possibly because the motor is not mounted down tight enough and it shifted during your short bashin session.

I notice that although the pinion is steel the spur gear is plastic why???
Because the spur gear is the weak point. The guinea pig; that's why yours burnt out...and it's very cheap to replace, versus an entire transmission internals going out.

What is the point of putting rubbish plastic gears in a car worth $600????
As stated above; it's the weak link on the vehicle for when stuff goes wrong (as it did in your case).

Cheap and nasty!!!
Yes, very cheap to replace as well.

Can anyone tell me what spur I should be running with the 17 tooth pinion so as I dont burn out the spur again and also if anyone knows where I can get a metal spur for the Emaxx instead of the plastic rubbish supplied?
Running a 32T Spur vs. a 72T Spur shouldn't for the most part make a difference in whether it burns up or not. That's not applicaable here.

To conclude, the issue would be how you run your truck. Make sure your motor is properly mounted down to the motor plate; so as it doesn't shift out of place much. Also, make sure your gear mesh is nicely set and that your Pinion gear is tightened down on the motor's shaft as well. And don't overtighten spur/slipper clutch. That's about it.

As for me, as I mentioned above i've been running 6S since I got my EMBE and I never had any issues with Spur gears burning/stripping. Not even if I try. Just follow the protocols above and you should be fine.

Thanks
Your welcome.
Antoine

And as ksb51rl said, calm yourself.

[Grand National]

I think you have got your answers. If you learn one thing from this thread, let it be that you should never (IMHO) run metal spurs unless you have a driveline that is practically bulletproof. Traxxas designers aren't idiots, they put plastic spurs to serve as a weak point so you don't ruin a much larger more expensive part if something goes wrong. It makes perfect sense, you should be thanking them, rather than calling their design "rubbish."

You have a good day man .

[Wildman4910]

A $3 spur is cheaper to replace than a torn up transmission.

Put another $3 (plastic) spur on it and rest your mesh.

I keep 4 extra spurs in my go box when we(me and my wife) go bashin.

[Antoine]

I think the first thing you need to do is calm down. The plastic spur gear is there to prevent catastrophic failure of other, harder to replace, and more expensive parts (internal gears mostly.) There is nothing improper or substandard about it. Your characterizations are not appreciated.
The most common cause of stripped spurs is improper pinion/spur mesh. This is not to say that someone can't set the mesh correct, but mesh CAN change due to the motor slipping from impacts, a bent motor plate, etc.
However, if you want to increase the strength of your external gears at the possible expense of other parts, I know Integy and Hot Racing make steel spurs. They make a different noise, but work well, and are actually easier to set mesh with, at least they were for me.

I am so sorry, I did not realise that criticism of anything Traxxas was not allowed. I do not believe that I said the product was sub-standard just not of a high enough one. If that is the level Traxxas produce to then C'est La Vie!

I assumed, that given the product advertising that the drivetrain could handle metal gearing. Obviously not.

Thank you for your spur gear suggestions I will try them out.

I think you have got your answers. If you learn one thing from this thread, let it be that you should never (IMHO) run metal spurs unless you have a driveline that is practically bulletproof. Traxxas designers aren't idiots, they put plastic spurs to serve as a weak point so you don't ruin a much larger more expensive part if something goes wrong. It makes perfect sense, you should be thanking them, rather than calling their design "rubbish."

You have a good day man .

Or they could make a bulletproof driveline!

[arvint]

There drive line is pretty bullet proof..one of the strongest ive seen before...just warning...theres a reason why the majority of rcs have plastic spurs...and those that do have metal (like the hyper 10sc) for example..are usually upgraded to plastic..

Haha..but what ever works for you i guess

[ksb51rl]

I am so sorry, I did not realise that criticism of anything Traxxas was not allowed. I do not believe that I said the product was sub-standard just not of a high enough one. If that is the level Traxxas produce to then C'est La Vie!

I assumed, that given the product advertising that the drivetrain could handle metal gearing. Obviously not.

Thank you for your spur gear suggestions I will try them out.

Your sincerity fails to impress. I highlighted the unreasonable parts of your original post above. To now write that rubbish, Cheap and nasty!!!, and plastic rubbish were not meant to mean that the product was sub-standard is sophistry at the very best.

Criticism is allowed. Unfair and uninformed flaming is a wholly different matter.

I don't suppose you'd criticize your 1:1 vehicle's manufacturer for "rubbish plastic" bumpers when you slam into a tree, now would you? Try to use the same kind of reasoning here.

[Emaxx2.0]

Ok lets use common sense. Would I want to strip a easy ascess plastic spur gear or a metal ilder inside the transmission which would require me to remove the SPUR GEAR and slipper clutch, detach the outdrives from the center driveshaft, and remove the motor and motor place? Hmm I'll stick to the $3US plastic spur. You will avoid damage if you A). Set the gear mesh correctly. B). Tighten the motor mount screw super tight to helavoid the motor from shifting during hard impacts. And C). Adjust the slipper clutch. It also helps if you check to see if your spur gear has a wobble in it. If it does make sure the slipper clutch plate is flat and the spur gear mounting screws(the one that attachs the spur to the slipper assembly) are equally tight which is don in a pattern. Also chekc if the slipper clutch pads are equally thick. If that doesn't help you'll have to replace the top shaft which would solve that problem. While you're at it. Stop using the factory supplied hex wretches. Pick up a high quality Hex driver set so you can tighten the screw down and without stripping the heads. It's all just common sense and general maintenances.
Traxas has the largest R.c community on the web. So if anything goes wrong people are here to help and super fast. But don't talk down Traxxas products or be disrespectful about it b/c no one will take the time to help.

[CumminsDriver]

Im going to butt in here and give my 2 cents.

I have had plastic and steel spur gears. Steel spur gears are a little easier to mesh and more forgiving to a bad mesh. Plastic spur gears must be meshed properly in order to hold up. However, if you have the spur and pinion meshed perfectly, you should never have a problem. My guess is that your mesh wasnt tight enough for one reason or the other.

Also, most people are saying that the spur is made to be the weak link. Im not so sure that is true. It saves them $$ to use a plastic spur, and they work fine when meshed correctly, so I think it is just a cost cutter.

The part that is made to save your driveline is the slipper clutch. That is what is supposed to slip when you get in a bind. The spur shouldnt strip when it gets under load though. Its not designed to do that, it just happens when the mesh is off. That is also why it makes no difference if he wants to run a steel spur. If the slipper is set right, it makes no difference what spur you run since the spur gear isnt designed to strip anyways.

I think the problem here was probably that the mesh wasnt perfect along with the fact that 6s is a lot of power. If the mesh was perfect, then I think it would hold up for a long time on 6s, and its cheap to have a replacement sitting around.

[Antoine]

Your sincerity fails to impress. I highlighted the unreasonable parts of your original post above. To now write that rubbish, Cheap and nasty!!!, and plastic rubbish were not meant to mean that the product was sub-standard is sophistry at the very best.

Criticism is allowed. Unfair and uninformed flaming is a wholly different matter.

I don't suppose you'd criticize your 1:1 vehicle's manufacturer for "rubbish plastic" bumpers when you slam into a tree, now would you? Try to use the same kind of reasoning here.

Of course you are right, as you are employed by Traxxas!

Presumably critcism is Ok along as it is the "right" kind of criticism . That is called dictatorship isnt it?. So much for freedom of speech!

I noted from your original post that you yourself have changed your spur. I am not sure why, if the standard plastic spur is good enough, but never mind.

I sincerely thank you for your Metal spur suggestions anyway.

[ksb51rl]

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