Brushless Buggy ?

[Dafni]

True. If I ever run a hardened pinion on a steel spur, I will get spares.

Originally posted by MetalMan
Whoa David, you are awake earlier than usual :). Hardened pinions are an option (no doubt), but the cost of them is pretty high. I would hate to hear of a pinion and spur stripping after a long period of use, since together the cost for replacement would be about $35.

There is always the way that I chose, and that is no center diff, but a center slipper clutch (using Revo parts) with MGT mod1 spurs (very strong). I have yet to strip a plastic spur gear! But that is also somewhat caused by the slipper clutch absorbing the things it should.

I had to drop my brother and sister off at school, that made me get up at 7:30......about 3 hours earlier than it was a couple weeks ago. :D

My major problem is that there are only two choices: diff or slipper. If you run a slipper, then you could just run it a bit loose and have metal gears that send any shock to the slipper.......but your handling and turn in suffers. Option #2 is to run a diff and get better traction, but blow out a spur on hard hits (remember Sheep Hills, Travis?). You can really only do one or the other, I would LOVE to make a system that: a) fits in the same space, and b) utilizes BOTH a slipper and a diff, for the best of both worlds. This way, you could still have the quiet-ness of a plastic spur, but the give of the slipper to take the shock out of hard landings as well as a diff to keep the handling up to par. Problem is, you're probably not going to be able to fit both of those onto a piece that can just drop into the vehicle......it'd have to be a least a little longer. Still, that would be mega cool........:Love:

[Dafni]

Dabid, I'm sure Serum will respond to this ;)

Any help with that would be cool, I don't really know where I'd start though. :L:

[Gustav]

Dabid,i've been thinking about this aswell.I'd like to use an e-maxx top shaft to drive a centre diff.

It may be possible to make a combined unit the same length if it was a ball diff because can't a ball diff be thinner?(pie in the sky,i know).

If you wanted to go with just the slipper the ofna dominator has a centre spool with a slipper.
i have one i may use in place of a tranny to get the ratio up for a 2240/12 on 8s lithium.(stand back to a safe distance:eek: )

[MetalMan]

Gustav - There are other options besides the top shaft for the Maxx. There is this HPI shaft which is what I use for my buggy's slipper clutch:
http://www2.towerhobbies.com/cgi-bin...4&I=LXFKF8&P=K
It is 6mm, so it is stronger than 5mm (Maxx top shaft). Also, most outdrives fit on a 6mm shaft, so this would fit without extra parts. The shaft would need to be cut down to fit though, and the sides would need a flat spot put on.
David used to use the Dominator slipper clutch. He said it didn't really slip at all. My reason for making one was that it is cheaper to buy the parts and put them together myself. Also, the spur gear is an inexpensive MGT gear, and there are a number of sizes to choose from (46t, 49t, 52t). It is a direct fit.

The idea of a slipper-diff has me thinking. I might be able to figure something out, but only time will tell.

EDIT:
Just thought of an idea to get a slipper on, but it will need the details worked in. Basically, the slipper plat/pad(s) mount onto the diff cup. Then the gear part would be tightened onto this "unit" (somehow, that's one of the details). The whole slipper-diff would require a larger space than a normal diff, but that can be figured out later.

[Gustav]

Thanks MetalMan,so are you using that shaft as the output shaft with the diff driving it?(ignore this i've just noticed how stupid i am)
I was thinking the other way round,using the e-maxx shaft with the strobe and spur with an e-maxx input gear driving the diff gear.

Do you have pics of your set up somewhere on line i could check out because i think i've got the wrong end of the stick so to speak.(another edit, i've just realised you must just be using it as a centre spool,no diff at all,silly me.No need for pics sorry.)

I just saw your edit,now your talkin',I don't see why that couldn't work.I'd be fairly long though by the time you factor in the slipper spring.You could use a collar threaded on the shaft to tension the spring like on that ofna slipper.
Get that to work and we'll have to get your RC Monster status thingy upgraded to Genius.

[Gustav]

Brain fade or what!:L: :L: :L:

It is late here though.

[MetalMan]

I do have pictures of my current slipper setup. It actually uses a collar to hold on the spring, like the Dominator's slipper. I tighten the slipper by sticking it in the vice and put pressure on it by using a hand clamp. Here is a picture:

Just in case you are wondering, this is a custom mount (by me) for this setup that has a built-in motor mount (you can see the purple Feigao motor).

In regards to your questions/ideas,
I don't think that you could get the Maxx idler gear shaft to work properly in a 1/8 buggy with a typical diff setup. Maybe if you were to make a picture in paint to show what you mean, I might understand better. But you have to remember that whatever you do, you need to be able to attach the outputs for the dogbones to go into.

[Gustav]

Thanks,what i meant was building a tranny basically.
Using an input shaft (with slipper ) with an input gear driving the diff gear via an idler gear i suppose.The diff would be as is,complete with outdrives.(basically think of a single speed e-maxx tranny with a diff instead of the output gear).

It would't be ideal for me anyway because i don't want the gear reduction,extra weight/bulk.
That's why a combined slipper/diff would be ideal.

i'm going to ask my friend Billy who's been giving me lessons on his lathe if he can help with a combined slipper/diff using your idea with the diff case.

Any suggestions for slipper pad material?Do you think brake lining/pads could work?

I like your slipper.the dominator collar is threaded on though so you can adjust the slipper easily but that wouldn't be a problem with a lathe.

[Gustav]

It could work something like this:
Centre diff with long output shaft out of one side/slipper plate screwed to diff where spur usually mounts(or just face of diff case)/pad/spur gear mount/pad/plate/spring/collar/bearing/outdrive.

Hard to describe but i'm sure this could work.Either that or i'm insane which isn't out of the question:C:

[rchippie]

Originally posted by MetalMan
I'll chime in here too.
Elsewhere the use of a hardened steel pinion being used with a steel spur gear has been determined to not be a good thing. There is nothing better than to use a plastic spur gear. You get lower weight, less rotating mass, and something that wouldn't lead to a problem for both the pinion and spur (if the spur gear got stripped).

I'm not so sure thats correct. I havent seen to many spurs strip on the 1/8 buggy's but ocasonaly it happens. As for the extra rotating weight it is heavyier but the oiverall weight of the veichle is lighter. Plus the hardend pinion should last a while against the steel spur.

Problem with the slipper/diff I see is this: you gotta do it right, so it doesn't just unload to the front or rear. I could see this working it a larger two shaft design (like a tranny, just simple), which would either have to spread to the side, or go vertical.....either way, it's bigger than a diff or a slipper......and I can't think correctly right now for some reason. :D

[Dafni]

This top shaft idea (slipper/spur on shaft, diff underneath) is not new! Altough it's more of a Maxx thing than Buggy. (needs more reduction)

The buggy oriented diff, with an incorporated slipper has also been discussed among some people.

Bring it on, tinkerers, Serum and me would like to see some creations!

[Gustav]

Hi Dafni,I know i heard the top shaft idea on this forum somewhere before but i can't find it.

The reason the combined slipper/diff on the same shaft would be ideal for me is that i don't want the reduction because i'd like to run a Lehner 2240/12 on 8s (34500 rpm) to hit 60mph.(i'd need at least 22/51 with e-maxx 2nd gear). Plus i want the lower c of g it would give from lowering the heavy lehner.

Dabid, i know what your getting at but i think it could work if the slipper/spur was only on the input i.e with the slipper was on the diff case and neither of output shafts.

So imagine a diff cup with a very long part that the bearing usually sits on with the whole slipper arrangement on it.ie plate/pad/strobe type spur adapter/pad/plate/spring/threaded collar/bearing.