RCCrawler Forums

claudiolara · 03-13-2007, 08:12 AM

I, i'm building a clod crawler so i buy a clodbuster kit and build the links and chassis, and try to use most parts from the kit, this is my first build so i have to solve several problems to make it work, the first and worst problem is that in my first test run, if the rear axle have more traction than the front, then the rear axle gets near the front until they touch each other (from -- to /\), i was thinking that may be the shocks are too long and don't limit the axles, or is too high GC.

any help thanks

Claudio

mavicracer · 03-13-2007, 08:40 AM

do you have any pics of the rig?

claudiolara · 03-13-2007, 08:44 AM

tonight i will take a few and post

claudio

TwistedMetal · 03-13-2007, 08:45 AM

that is definately a big problem. your right though, somehow the shocks are not limiting the axle movement. you should post some pics so that we can maybe see whats going on.

claudiolara · 03-13-2007, 09:00 AM

i used the crapy shocks from the Clodbuster Kit, may be thats the problem.

Claudio

TwistedMetal · 03-13-2007, 09:09 AM

maybe not. it could be the way you have mounted them.

DaViolentOne · 03-13-2007, 09:37 AM

Do you have your motors wired in series, rear one first? That can be a problem, too... The first motor in line will get the power while the 2nd one will have to deal with what's left over... That will make one go faster than the other... If that's the case, re-wire them in parallel... Basicly, split each motor line into a Y and run one of each to each motor...

claudiolara · 03-13-2007, 09:48 AM

In my first run, i had two esc with two separate batteries for each axle, i changed to see if that was the problem, now it has one esc, one battery and parallel connected and the front is getting power first, when the front don't get traction the rear still get it.

Claudio

claudiolara · 03-14-2007, 08:35 AM

These is my clod:

Claudio

DaViolentOne · 03-14-2007, 10:04 AM

Ok.. Part of the problem is the triangulation... If you can get yer link points on the chassis to about the same height apart as on the axles, that should help take a lot of that creeping out... Basicly, you want your links to be parallel all the way across the length of them... The reason why you get that odd creep is 'cos there's nothing stopping them from doing that and proper links would definatly help stop that...

You need to make your chassis sides a lot taller... Move the upper link points on the chassis up to where the shocks attatch and you need to raise the shock mounts up a fair bit, too... At least 2" up and somewhat out...

Here's a pic of the side of my chassis... It's a Clod based RC Guy Gecko II... You'll notice my links don't go parallel but that's 'cos I can't yet 'cos my motors are too long with the mounts to let the lower link pass by... But the spacing on the chassis is about right... Try get yours to look like that and that should help improve the stability a lot of the links...

claudiolara · 03-14-2007, 02:46 PM

i will change the chassis sides to and try again

thanks for your help.

Claudio

DaViolentOne · 03-14-2007, 03:02 PM

No probz, man... We all gotta learn somehow... I got lucky and got a great deal on an atermarket chassis... Had I tried to build one, I might have been in the same boat, as I knew nothing about suspension of a crawler... Now that I've had one for a while and spent a fair few hours reading on this and other sites, I think I could try and build one of my own design... But I think that can wait...

03-13-2007, 08:12 AM	#1
claudiolara Newbie Join Date: Dec 2006 Location: Santiago Chile Posts: 6	Problem with my first build I, i'm building a clod crawler so i buy a clodbuster kit and build the links and chassis, and try to use most parts from the kit, this is my first build so i have to solve several problems to make it work, the first and worst problem is that in my first test run, if the rear axle have more traction than the front, then the rear axle gets near the front until they touch each other (from -- to /\), i was thinking that may be the shocks are too long and don't limit the axles, or is too high GC. any help thanks Claudio

03-13-2007, 08:40 AM	#2
mavicracer Rock Stacker Join Date: Mar 2005 Location: Louisville Posts: 93	do you have any pics of the rig?

03-13-2007, 08:44 AM	#3
claudiolara Newbie Join Date: Dec 2006 Location: Santiago Chile Posts: 6	tonight i will take a few and post claudio

03-13-2007, 08:45 AM	#4
TwistedMetal Pebble Pounder Join Date: Feb 2007 Location: Monrovia Posts: 178	that is definately a big problem. your right though, somehow the shocks are not limiting the axle movement. you should post some pics so that we can maybe see whats going on.

03-13-2007, 09:00 AM	#5
claudiolara Newbie Join Date: Dec 2006 Location: Santiago Chile Posts: 6	i used the crapy shocks from the Clodbuster Kit, may be thats the problem. Claudio

03-13-2007, 09:09 AM	#6
TwistedMetal Pebble Pounder Join Date: Feb 2007 Location: Monrovia Posts: 178	maybe not. it could be the way you have mounted them.

03-13-2007, 09:37 AM	#7
DaViolentOne Rock Crawler Join Date: May 2006 Location: Surrey, BC, Canada Posts: 870	Do you have your motors wired in series, rear one first? That can be a problem, too... The first motor in line will get the power while the 2nd one will have to deal with what's left over... That will make one go faster than the other... If that's the case, re-wire them in parallel... Basicly, split each motor line into a Y and run one of each to each motor...

03-13-2007, 09:48 AM	#8
claudiolara Newbie Join Date: Dec 2006 Location: Santiago Chile Posts: 6	In my first run, i had two esc with two separate batteries for each axle, i changed to see if that was the problem, now it has one esc, one battery and parallel connected and the front is getting power first, when the front don't get traction the rear still get it. Claudio

03-14-2007, 08:35 AM	#9
claudiolara Newbie Join Date: Dec 2006 Location: Santiago Chile Posts: 6	These is my clod: Claudio

03-14-2007, 10:04 AM	#10
DaViolentOne Rock Crawler Join Date: May 2006 Location: Surrey, BC, Canada Posts: 870	Ok.. Part of the problem is the triangulation... If you can get yer link points on the chassis to about the same height apart as on the axles, that should help take a lot of that creeping out... Basicly, you want your links to be parallel all the way across the length of them... The reason why you get that odd creep is 'cos there's nothing stopping them from doing that and proper links would definatly help stop that... You need to make your chassis sides a lot taller... Move the upper link points on the chassis up to where the shocks attatch and you need to raise the shock mounts up a fair bit, too... At least 2" up and somewhat out... Here's a pic of the side of my chassis... It's a Clod based RC Guy Gecko II... You'll notice my links don't go parallel but that's 'cos I can't yet 'cos my motors are too long with the mounts to let the lower link pass by... But the spacing on the chassis is about right... Try get yours to look like that and that should help improve the stability a lot of the links...

03-14-2007, 02:46 PM	#11
claudiolara Newbie Join Date: Dec 2006 Location: Santiago Chile Posts: 6	i will change the chassis sides to and try again thanks for your help. Claudio

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03-14-2007, 03:02 PM	#12
DaViolentOne Rock Crawler Join Date: May 2006 Location: Surrey, BC, Canada Posts: 870	No probz, man... We all gotta learn somehow... I got lucky and got a great deal on an atermarket chassis... Had I tried to build one, I might have been in the same boat, as I knew nothing about suspension of a crawler... Now that I've had one for a while and spent a fair few hours reading on this and other sites, I think I could try and build one of my own design... But I think that can wait...

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