RCCrawler Forums

zBigBadWolf · 02-12-2007, 09:55 PM

Take one of those nice plastic bearing containers... plastic is so easy to work with.

Hack a piece off and grind two curves into it to fit over curves on inside of knuckle.

Mount on axle.

Make sure it is snug so there is no slop at all.

I can paint it but for now it will stay clear. Next I am going to cut off the arms on my knuckles since they aren't needed.

And yes, it's damn sturdy!

The Muscle · 02-12-2007, 10:08 PM

what size bearing container is that?
this is a great mod.

k9popo · 02-12-2007, 10:12 PM

Nice,

I am going to give that one a try

...

joey · 02-12-2007, 10:13 PM

that looks like a great idea. does it work good?

revin9k · 02-12-2007, 10:19 PM

wow! that will help with the weight saving also..cool idea!
edit: i got that bearing container when you buy set's of bearings for the axels

Ballistic223 · 02-13-2007, 03:06 AM

Man someone needs to make those out of derlin or something like that and sell them!

cartronicshn · 02-13-2007, 06:10 AM

awesome idea.

zBigBadWolf · 02-13-2007, 06:22 AM

The tubes themselves are made of a reasonably thick material and while some house crawling and deliberate smacks of it show signs of it holding up, until this is rock tested I can't swear to anything.

The plastic still flexes a bit on hard raps which I consider a good thing. Better that then snapping something.

mascman · 02-13-2007, 06:43 AM

Quote:

Originally Posted by zBigBadWolf

The tubes themselves are made of a reasonably thick material and while some house crawling and deliberate smacks of it show signs of it holding up, until this is rock tested I can't swear to anything.

The plastic still flexes a bit on hard raps which I consider a good thing. Better that then snapping something.

Good job.

See if you can get the diameter of it. I was thinking of trying something with PVC or even Aluminum tube.

zBigBadWolf · 02-13-2007, 07:24 AM

Ok word from Kevin... Mr. Engineering himself.

There is a physics problem here. Torque is force times distance. If we apply a 10 pound force to the outside of a 2.2 tire and: Stop it from turning with a tie rod attached to the knuckle at about 1/2 the distance in from center. The force exerted on that tie rod might be around 20 pounds. Stop it from turning with a plastic bushing 1/8 the distance from center to the force. The force exerted on that plastic bushing will be around 80 pounds!

Whatever you make them out of, that setup will create allot of force in the components in that area and most definitely will increase the failure rate of those components (knuckles, axle c's, axle tube, etc).

So... as I originally said, hopefully the amount of flex the plastic offers is enough to stop other parts from snapping.

TwistedCreations · 02-13-2007, 07:32 AM

Quote:

Originally Posted by Ballistic223

Man someone needs to make those out of derlin or something like that and sell them!

Really?

I have been working on getting them machined, but being as small as they are, is a PITA.. I personally do not have the mill and crap to try it, so have to send them off to a friend.. Since mine cover the whole inside to help with the forces applied, there is more shaving than just for the inside of the knuckles, which makes them a pain

Right now I have just been doing them by hand, test fit, more shaving, test fit etc.

greasypete · 02-13-2007, 08:09 AM

Quote:

Originally Posted by TwistedCreations

Really?

I have been working on getting them machined, but being as small as they are, is a PITA.. I personally do not have the mill and crap to try it, so have to send them off to a friend.. Since mine cover the whole inside to help with the forces applied, there is more shaving than just for the inside of the knuckles, which makes them a pain

Right now I have just been doing them by hand, test fit, more shaving, test fit etc.

Great !! Can you tell me the thickness of this plate ? Is this 6mm ?

Thanks, Pete

TwistedCreations · 02-13-2007, 12:28 PM

1/4" Delrin

96ZJ · 02-13-2007, 04:30 PM

Thats an awsome idea. I really like it in 1/4" derlin. It looks like it would be really easy to make a set for myself.

zBigBadWolf · 02-13-2007, 04:49 PM

Be careful with the delrin... if you use something that doesn't flex, you're likely to break something else.

nandez11 · 02-13-2007, 05:53 PM

Quote:

Originally Posted by zBigBadWolf

Be careful with the delrin... if you use something that doesn't flex, you're likely to break something else.

Wouldn't you think with the Delrin, it would make a tighter fit and fill in more surface area to dispense more of the force. Plus with the Delrin, it looks to be more of one solid piece. I guess if anything get a pair of Fat-rock axel C-s and some aluminum knuckles and see how it goes from there.

02-12-2007, 09:55 PM	#1
zBigBadWolf Quarry Creeper Join Date: Jan 2004 Location: Long Island Posts: 248	How I locked out rear steer Take one of those nice plastic bearing containers... plastic is so easy to work with. Hack a piece off and grind two curves into it to fit over curves on inside of knuckle. Mount on axle. Make sure it is snug so there is no slop at all. I can paint it but for now it will stay clear. Next I am going to cut off the arms on my knuckles since they aren't needed. And yes, it's damn sturdy! Last edited by zBigBadWolf; 02-02-2012 at 08:52 AM.

02-12-2007, 10:12 PM	#3
k9popo I wanna be Dave Join Date: Sep 2005 Location: * Posts: 2,877	Nice, I am going to give that one a try...

02-12-2007, 10:08 PM	#2
The Muscle Rock Crawler Join Date: May 2006 Location: san diego Posts: 607	what size bearing container is that? this is a great mod.

02-12-2007, 10:13 PM	#4
joey Rock Stacker Join Date: Sep 2006 Location: Everett Posts: 93	that looks like a great idea. does it work good?

02-12-2007, 10:19 PM	#5
revin9k Quarry Creeper Join Date: Nov 2006 Location: Lexington Park Posts: 420	wow! that will help with the weight saving also..cool idea! edit: i got that bearing container when you buy set's of bearings for the axels

02-13-2007, 03:06 AM	#6
Ballistic223 Newbie Join Date: Sep 2006 Location: At the nuthouse! Posts: 32	Man someone needs to make those out of derlin or something like that and sell them!

02-13-2007, 06:10 AM	#7
cartronicshn I wanna be Dave Join Date: May 2006 Location: HONDURAS...ROCK HEAVEN Posts: 5,076	awesome idea.

02-13-2007, 06:22 AM	#8
zBigBadWolf Quarry Creeper Join Date: Jan 2004 Location: Long Island Posts: 248	The tubes themselves are made of a reasonably thick material and while some house crawling and deliberate smacks of it show signs of it holding up, until this is rock tested I can't swear to anything. The plastic still flexes a bit on hard raps which I consider a good thing. Better that then snapping something.

02-13-2007, 07:24 AM	#10
zBigBadWolf Quarry Creeper Join Date: Jan 2004 Location: Long Island Posts: 248	Ok word from Kevin... Mr. Engineering himself. There is a physics problem here. Torque is force times distance. If we apply a 10 pound force to the outside of a 2.2 tire and: Stop it from turning with a tie rod attached to the knuckle at about 1/2 the distance in from center. The force exerted on that tie rod might be around 20 pounds. Stop it from turning with a plastic bushing 1/8 the distance from center to the force. The force exerted on that plastic bushing will be around 80 pounds! Whatever you make them out of, that setup will create allot of force in the components in that area and most definitely will increase the failure rate of those components (knuckles, axle c's, axle tube, etc). So... as I originally said, hopefully the amount of flex the plastic offers is enough to stop other parts from snapping.

02-13-2007, 12:28 PM	#13
TwistedCreations Colt Python/SR9c Join Date: Feb 2004 Location: out in the shop, reloading ammo! Posts: 8,626	1/4" Delrin

02-13-2007, 04:30 PM	#14
96ZJ Newbie Join Date: Jan 2007 Location: Middletown Posts: 32	Thats an awsome idea. I really like it in 1/4" derlin. It looks like it would be really easy to make a set for myself.

02-13-2007, 04:49 PM	#15
zBigBadWolf Quarry Creeper Join Date: Jan 2004 Location: Long Island Posts: 248	Be careful with the delrin... if you use something that doesn't flex, you're likely to break something else.

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