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-   -   1:4 cj3a (http://www.rccrawler.com/forum/large-scale-rigs/276483-1-4-cj3a.html)

youngblood 10-20-2010 07:38 PM

1:4 cj3a
 
This all started with a super I built for Motorama last year. It was kinda fun while it lasted, but it only lasted half way through course 2 and that was the end of that (broke AX tranny gears). So I parted it out and kept my XTM X-FACTOR axles. http://i665.photobucket.com/albums/v...e/DSC00899.jpg

Bye bye short lived super career, hello large scale!!!

The first thing that really got me excited for a large scale build for me was RC4WD releasing the RokLox' in 40 series. They are perfect for 1:4. They scale out to be a 35" tire on a 16" rim. Here's one of mine on a narrowed Axial 40 BL next to a 1.9 flatiron. :twisted:

http://i665.photobucket.com/albums/v...e/DSC00957.jpg

Next, I knew it had to be an old jeep because it would be easier to build the body (mostly flat panels), and I love old jeeps! Printed out a photo of a M38 grill from the interwebs and scaled it down to reproduce.

http://i665.photobucket.com/albums/v...e/DSC00956.jpg

With a little bit of manual mill work, and a bunch of hand work with a dremel, heres my 1:4 scale CJ3A grill. it is made from a plastic that is a little softer than delrin .125 thick. Still needs the marker light holes.

http://i665.photobucket.com/albums/v...e/DSC00955.jpg

Really wanted to use these M5 steely RC4WD rod ends on my lower links, but they dont have enough travel, so Im using them for the uppers links/axle side, and rear axle lockouts.

http://i665.photobucket.com/albums/v...e/DSC00944.jpg

Scored a set of Losi LST shocks out of the wanted section. They are BIG and the springs might be a little stiff. the spring diameter is close to a 540 can. :shock: Bent the shock hoops out of 3/8" brake line and welded them with my 110v flux core mig welder. bolted to the 3/16" thick aluminum frame using 5/16-24 bolts.

http://i665.photobucket.com/albums/v...e/DSC00942.jpg


And here it is as a roller. I cut the frame out on a band saw and cleaned it up with a drum sander. Skid and sliders are out of 3/8 thick delrin. Lower links are 3/8" delrin with revo rod ends on 10-32 allthread, uppers are 5/16" dia.

Just a little note, M5 bolts thread right into a 10-32 hole. :mrgreen:

22" wheelbase. (x4 = 88". just about perfect for a flatty on 35's.)

Frame is 29 1/4" long, 6" wide.

17" track width

5 3/4" underbelly.

http://i665.photobucket.com/albums/v...015_221823.jpg

http://i665.photobucket.com/albums/v...015_223316.jpg

http://i665.photobucket.com/albums/v...015_223452.jpg

-Brian

DonsATV 10-20-2010 08:28 PM

Holy sheep sh!t batman!!!!!! :shock:


Subscribed!!! "thumbsup"

ScalerLover 10-20-2010 09:52 PM

Quote:

Originally Posted by DonsATV (Post 2696774)
Holy sheep sh!t batman!!!!!! :shock:


Subscribed!!! "thumbsup"

X2
That is massive, i thought my 1:6 Titan monster was big with TXTs and Clod Slingers.

Gula 10-21-2010 12:11 AM

Looks Awesome. I still need to build my Giant Mog I got from someone on here. I'll be using Mad force axles and 40's crushers though.

ROWDY RACING 10-21-2010 09:42 AM

Dude that thing is awesome, can't wait to see the progress from here. "thumbsup"

Bogger 10-21-2010 11:13 AM

Subscribed!!:)

gatesr120 10-21-2010 11:21 AM

that things fawking HUGE!!! what are you gonna power that beast with??

supercrawlerfreak 10-21-2010 11:46 AM

That looks sweet so far man. "thumbsup"

youngblood 10-21-2010 08:13 PM

Thanks guys. Here are a couple pics I've been using for ideas and dimensions.

http://i665.photobucket.com/albums/v...ne/CJfront.jpg

http://i665.photobucket.com/albums/v...machine/mb.jpg

http://i665.photobucket.com/albums/v...dimensions.jpg

And here is my 2D cad drawing I'm using to locate everything. I actually printed the shock hoops at 1:1 and used it as a template when bending.

http://i665.photobucket.com/albums/v...olor_rhino.jpg

PhantomRS10 10-21-2010 08:27 PM

Im ready for mooore pics "thumbsup"

TLTCrawlin 10-21-2010 08:33 PM

Is that rhino3d............? I like that program alot.

The build is looking shweet man!

mar618 10-21-2010 09:13 PM

looking amazing,keep posting for us

youngblood 10-22-2010 07:19 PM

Quote:

Originally Posted by TLTCrawlin (Post 2698566)
Is that rhino3d............?

Yup. I've been using rhino for 4 years now, and love it. I could have drawn this up in 3d but didn't really see the need.

Here's my bulldog Berkeley helping me measure a CJ hood I had out in the garage.

http://i665.photobucket.com/albums/v...022_174835.jpg

This is a test piece I made for all of the body panels. It is .070 thick lexan that I put in the oven for five minutes @ 250. It becomes very soft and I pushed it over my little 2x4 scrap with my hands in gloves. It returned to original hardness in about 30 seconds. Very happy with the test results!

http://i665.photobucket.com/albums/v...022_200347.jpg

TLTCrawlin 10-22-2010 07:51 PM

Very neat build man. I had a 1/6 scale TXT, and it was cool. I think I'll do a big scaler. They are awesome. Electronics aren't cheap.

AndR3Z 10-22-2010 09:44 PM

very nice build.

suscribed :twisted:

Creepy Inc. 10-25-2010 12:06 PM

Looking good Poter. The Lexan bent nice a hell.

So when are you going the get a steel geared E-Max trany with dual 7t pullers?:twisted:

BigSki 10-25-2010 01:08 PM

You should be able to drag the 'Tractor' around with this beast! You bringing the pooch to Bobrocks?

Bulldog 10-25-2010 10:17 PM

Awesome build!!!! Subscribed!!! The pics and build are perfect. Keep up the great work! The inspiration is SICK!!!! Tuned in for sure!!!

youngblood 10-26-2010 06:48 PM

Quote:

Originally Posted by gatesr120 (Post 2697711)
What are you gonna power that beast with??

Quote:

Originally Posted by Creepy Inc. (Post 2704544)
So when are you going the get a steel geared E-Max trany with dual 7t pullers?:twisted:

Im going to try my beefed up AX10 tranny with DNA dig and 7t puller on 3s for now. If it doesnt hold up, The Emaxx trans might be viable option. Im pretty sure Im going to need a 2:1 gear reduction unit for my AX transmission in the meantime... If anybody has one they want to part with, PM me! :mrgreen:

Quote:

Originally Posted by BigSki (Post 2704654)
You bringing the pooch to Bobrocks?

Im not bringing the dog to BobRocks, I dont want her to shit all over everything. :lmao: Might bring the 1:4 CJ roller for you guys to check out though, I want to see it next to a 1:6 GI Joe Jeep.



Just a random reference shot.
http://i665.photobucket.com/albums/v...Afrontclip.jpg

Here are the molds I made for the hood and cowl. The blue tape under the lexan on the cowl mold is some filler for my fawk up of removing too much material on the front radius...

Basically I cut the molds to exact size and cut the lexan with extra. After forming the lexan over the mold, I use a band saw & disc sander to remove the excess lexan and finish the panel to size(using the wooden mold as a template).

http://i665.photobucket.com/albums/v...e/DSC00975.jpg

And here are my first 3 body panels together with a standard size bic lighter for size reference. The dark spots in the corner of the cowl piece are lumpy high spots from the blue tape, that I sanded down after foming. http://i665.photobucket.com/albums/v...e/DSC00977.jpg

Next is bend some more brake line to create the framework for these body panels. -Brian

fred0000 10-26-2010 07:11 PM

wow looks great, nice chassis/running gear setup I like it, body start looks top notch aswell, cant wait to see it more complete, with the clear acrylic pannels you could paint the inside silver and if you were to scratch the paint it would reveal the "steel"

BansheeManiac 10-26-2010 08:01 PM

Well your bull dog now has his very own whippp:lmao:





subscribed

miracLe 10-27-2010 06:52 PM

subbed.

Bart bender 10-28-2010 11:25 AM

VERY nice. I like it. Never thought of using thin lexan for body panels. You even have to form them or do they just lay down onto the molds with heat? Those tires are perfect for 1/4 scale aren't they. If you fill the AX10 trany with steel I think it will hold up. Now the 7t puller on the other hand. It may get a little hot on you. My 10t gets hot in my 9lb Super. If John has and 14 or 16 turn armatures I think that would be more better. Keep it up. Now I HAVE to get mine finished.

youngblood 10-28-2010 12:47 PM

Quote:

Originally Posted by Bart bender (Post 2710469)
VERY nice. I like it. Never thought of using thin lexan for body panels. You even have to form them or do they just lay down onto the molds with heat? Those tires are perfect for 1/4 scale aren't they. If you fill the AX10 trany with steel I think it will hold up. Now the 7t puller on the other hand. It may get a little hot on you. My 10t gets hot in my 9lb Super. If John has and 14 or 16 turn armatures I think that would be more better. Keep it up. Now I HAVE to get mine finished.

I imagine that if I used higher heat the panels would "melt" over the mold, but the temp I use gives them the consistency of half cooked lasagna noodles which makes them very easy to form by hand, but not soft enough to leave fingerprints. With the 7t puller (could be one of the 10t's w/ 7t sticker...) I was thinking I'd need the 2:1gru. But you might be onto something with the higher turn arm. I think I'll get it half way running with the 7 and contact JRH if need be.

Keeping an eye on this too. Looks like it might be a great option paired up with a Mamba Max Pro.
http://www.rccrawler.com/forum/electronics/277640-puller-pro-tech-thread.html

rcfreak363 11-05-2010 09:45 PM

looking forward to this being completed. great job so far

youngblood 11-22-2010 08:24 PM

I havent been making much progress on this thanks to being very distracted by my other build, a 1.55 VW bus. Here's the steering tie-rod for the 1:4 CJ, I had to bend the ends to clear the Xfactor diffs at full lock. Its longer than the wheelbase of the vw... :ror:

http://i665.photobucket.com/albums/v...e/DSC01019.jpg

Scored a 7980 out of the FS section! This thing is badass, and I havent even plugged it up yet. Yes, it is over 600oz of torque, but I'm still worried it might not be enough in a 20 pound truck with 8"+ tires. Also picked up a 1" Hangar-9 servo arm.


http://i665.photobucket.com/albums/v...e/DSC01030.jpg

If the 7980 is too weak I might have to try one of these. I think I have enough room for it, but I'm not crazy about the exposed gears. 1500 oz... :shock:
http://www.servocity.com/html/spg785...o_gearbox.html

Bought some aluminum piano hinge for the hood from McMaster-Carr. It's scary how easy it is to spend money with them, and next day shipping doesnt help.

http://i665.photobucket.com/albums/v...e/DSC01031.jpg

and Finally, I got the grill mounted on the grill hoop. Also got a picture with a 1/6 scale Willys (Thanks BigSki, I hope mine turns out half as nice as yours. "thumbsup") -Brian

http://i665.photobucket.com/albums/v...e/DSC00991.jpg

adamargue 11-22-2010 08:27 PM

That looks awsome. U going to try chassie mounted steering

youngblood 11-22-2010 08:32 PM

Quote:

Originally Posted by adamargue (Post 2756077)
That looks awsome. U going to try chassie mounted steering

Yup, the 7980 will mount inside the drivers side frame rail, just like a steering box on a 1:1.

adamargue 11-22-2010 08:33 PM

That looks great man. Hopefully l get around to my bronco some day ha ha

Big Mike 11-23-2010 07:56 AM

Quote:

Originally Posted by youngblood (Post 2756074)

:shock: Man that thing is huge!! I bet it's going to be a blast to drive.

Best use of 40 series tires/wheels I've ever seen...

BigSki 11-23-2010 11:56 AM

Quote:

Originally Posted by youngblood (Post 2756074)
and Finally, I got the grill mounted on the grill hoop. Also got a picture with a 1/6 scale Willys (Thanks BigSki, I hope mine turns out half as nice as yours. "thumbsup") -Brian

http://i665.photobucket.com/albums/v...e/DSC00991.jpg

Brian, yours is already nicer than mine, all I built was a roll cage and a front bumper, you are fabricating 80% of your jeep! "thumbsup"

dusty husky 11-28-2010 10:17 PM

I'm thinking a 4-stroke would sling some dirt with those huge tires. looks good I just finished a 1/8 scale flatfender myself.

jeepjames87 11-30-2010 06:40 PM

WOW! :shock: How Kool! I want! too bad i got rid of my x factor. :x

good luck with the build.

six6six 12-11-2010 06:22 PM

Holy hell! That thing is HUGE! I cant wait to see this thing done, be sure to take some video of the finished product too!

Creepy Inc. 12-12-2010 05:28 PM

Come on Pottsie, This thing needs to be done.

KC_JoNeS 12-14-2010 01:55 AM

In....hoping to see some more progress!!!

The Real Dogman 12-18-2010 08:07 PM

Put me down for more updates!! Nice ideas and killer work so far!!

Bogger 12-21-2010 03:34 AM

We need updates! :)

CraZySteve 12-21-2010 02:28 PM

Quote:

Originally Posted by youngblood (Post 2756090)
Yup, the 7980 will mount inside the drivers side frame rail, just like a steering box on a 1:1.

Yea - the 7980TH is the Master Servo of Torque! I am seriously considering one for my TXT-1 Crawler build "thumbsup"

grant00 12-21-2010 04:16 PM

subscribing! this things gonna be nice


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