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-   -   Ring and pinion shimming (http://www.rccrawler.com/forum/traxxas-trx-4/617662-ring-pinion-shimming.html)

TK421 04-26-2020 11:50 AM

Ring and pinion shimming
 
What’s the best solution to shimming the ring and pinion on the front and rear axles?

Lou

Inspector86 04-29-2020 11:14 PM

Re: Ring and pinion shimming
 
I have never found it necessary to shim the R&P on any of my TRX4 axles.

TK421 04-30-2020 06:36 AM

Re: Ring and pinion shimming
 
Right on. My truck rolls .75" front to back sitting on level ground. The biggest area of slop I see is in the ring and pinion and next is the axle to the diff, this is both front and rear. I'm super anal and I just want to get the most out of my rig.

Lou

Inspector86 04-30-2020 10:09 AM

Re: Ring and pinion shimming
 
I think you're chasing windmills. But if you feel you have excessive play in the R&P you would need to move the pinion closer to the ring gear. You do this by placing the shim between the pinion gear and inner bearing. A little goes a long way so you may need a selection of shims to find the one that you need.

TK421 04-30-2020 11:35 AM

Re: Ring and pinion shimming
 
1 Attachment(s)
I'm an A&P helicopter mechanic by trade. I've rebuilt a few gearboxes in my day...

I'm knee deep into my SCX10.3 build. I spent 1.5hrs shimming the axles on it. I found a nice shim set that is 5x8 ID, OD with thicknesses from .1mm to .3mm. I just cant seem to find the same for 6mm ID to match the TRX-4 pinion shaft.

Here is where I ended up with on the 10.3.

Lou

JacktheRipper 04-30-2020 06:18 PM

Re: Ring and pinion shimming
 
Quote:

Originally Posted by TK421 (Post 6018472)
I'm an A&P helicopter mechanic by trade. I've rebuilt a few gearboxes in my day...

I'm knee deep into my SCX10.3 build. I spent 1.5hrs shimming the axles on it. I found a nice shim set that is 5x8 ID, OD with thicknesses from .1mm to .3mm. I just cant seem to find the same for 6mm ID to match the TRX-4 pinion shaft.

Here is where I ended up with on the 10.3.

Lou

Lou.

Nice I like the tuning on the gear, where did you find the shim set mentioned?



Pep

TK421 04-30-2020 10:47 PM

Re: Ring and pinion shimming
 
https://www.ebay.com/itm/391733629202

Now that I looked it up again, I see the6 have the same kit for 6mm... problem solved ;-)

Lou

JacktheRipper 05-01-2020 11:53 AM

Re: Ring and pinion shimming
 
Quote:

Originally Posted by TK421 (Post 6018679)
https://www.ebay.com/itm/391733629202

Now that I looked it up again, I see the6 have the same kit for 6mm... problem solved ;-)

Lou

The crowd roars ... going pick some of those up, thanks for the pointer. Knowing these can be had, I will dig in and get rid of the slop ....
Best thread read so far. ..... 10pts
Pep

TK421 05-01-2020 12:39 PM

Re: Ring and pinion shimming
 
Quote:

Originally Posted by JacktheRipper (Post 6018781)
The crowd roars ... going pick some of those up, thanks for the pointer. Knowing these can be had, I will did in and get rid of the slop ....
Best thread read so far. ..... 10pts
Pep




Thanks bro.



I know this level of work is not for everyone and that's totally cool. As for me, I just want my equipment to perform as good as it possibly can. When I find a limit, or a problem I can't correct, then it will start looking for a new rig.

I DO chase the dragon... I do that same with my drones, I keep trying different stuff until I'm happy with how the quad flies.


There is no wrong way to "hobby", as long as you are having fun, roll with it!


Lou

Steve g 05-01-2020 01:20 PM

Re: Ring and pinion shimming
 
I went over board shimming the diffs on my wraiths. Even filed down my LURC locker to be able to shim the ring gear over. Got them perfect and now there's absolutely no slop. Took quite a while to get it right, but its worth it. You probably know already since you did one already, but leave a tiny amount of back lash when shimming it without grease, so there is room for the grease when you add grease. First one I did ended up to tight once I greased it, and had to take it apart again.

Sent from my SM-G970U using Tapatalk

Inspector86 05-01-2020 06:29 PM

Re: Ring and pinion shimming
 
Quote:

Originally Posted by TK421 (Post 6018472)
I'm an A&P helicopter mechanic by trade. I've rebuilt a few gearboxes in my day...

Lou


A&P mechanic! Now I understand your attention to detail. A little context makes a world of difference.

JacktheRipper 05-01-2020 09:20 PM

Re: Ring and pinion shimming
 
Quote:

Originally Posted by Steve g (Post 6018809)
I went over board shimming the diffs on my wraiths. Even filed down my LURC locker to be able to shim the ring gear over. Got them perfect and now there's absolutely no slop. Took quite a while to get it right, but its worth it. You probably know already since you did one already, but leave a tiny amount of back lash when shimming it without grease, so there is room for the grease when you add grease. First one I did ended up to tight once I greased it, and had to take it apart again.

Sent from my SM-G970U using Tapatalk

Actually that clearance can be set, and repeatable using note book paper or wax paper.

Cut a strip 1/4 wide or so, bout 2"" long. Roll it in between the gear mesh. Shim the gear with paper in place .

Have a lathe, used setting the clearance of lead screw, drive gear of carriage. Just one example.

CNCist 05-01-2020 10:35 PM

Re: Ring and pinion shimming
 
I'm a nut for trying to get the most out of a rig but the mesh on mine was already as perfect as I would want it. Axial uses helical gears, they NEED to be meshed right or they will damage.

Just be careful, the trx4 pinion has a flange at the base of it don't go swimming so much that it hits that flange.

You may want to take everything apart and see if its just worn out. I don't know how old/new your rig is.

TK421 05-01-2020 10:43 PM

Re: Ring and pinion shimming
 
I got the rig second hand from FB marketplace. The chassis and links didn’t hardly have a scratch on them. The previous owner also has a trx4 rtr and I’m wondering if some parts didn’t get the swaperoo... I’ll get back to it once I’m done with my 10.3 and really get into the weeds.

Lou

CNCist 05-02-2020 02:11 AM

Re: Ring and pinion shimming
 
Quote:

Originally Posted by TK421 (Post 6018960)
I got the rig second hand from FB marketplace. The chassis and links didn’t hardly have a scratch on them. The previous owner also has a trx4 rtr and I’m wondering if some parts didn’t get the swaperoo... I’ll get back to it once I’m done with my 10.3 and really get into the weeds.

Lou

Yeah man just check the axle gears. I just checked mine (3 weeks old) and all my slop comes from the portals, not the diffs. I replaced all my lube with Lucas red n tacky, but I don't think that will take away a lot of slop. Lucas will just lubricate/cool much better than Chinese grease.

TK421 05-02-2020 08:04 AM

Re: Ring and pinion shimming
 
I’ll have to look into the Lucas stuff. I’ve used Tri-flow grease for all my RC stuff for years. I’ll for sure take a closer look at the portal gears too, thanks!

Lou

BREL 05-02-2020 01:11 PM

Re: Ring and pinion shimming
 
Quote:

Originally Posted by CNCist (Post 6019003)
Yeah man just check the axle gears. I just checked mine (3 weeks old) and all my slop comes from the portals, not the diffs. I replaced all my lube with Lucas red n tacky, but I don't think that will take away a lot of slop. Lucas will just lubricate/cool much better than Chinese grease.

going to get some of that Lucas red n tacky grease for my TRX 4 and may use it on my push bike bearings too


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