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6x6 Swivel Frame Semi

OlYelr

Quarry Creeper
Joined
Jun 14, 2007
Messages
406
Location
Maryville, TN
It's been a while since I've done a whole lot with my RC stuff, being busy with work and 1:1 toys. I've slowly made some progress on my next project and figured I've made it far enough to start sharing. Just don't expect it to get finished quickly.

Started with a Tamiya Knight Hauler and converted to 6x6 with a TLT front axle. Put RC4WD axle extenders on the rear, making them very close in width. The rear is actually about 1/4" wider than the front now. Also put some longer leaf springs on the rear so larger rear tires won't touch. I think they are OG Bruiser springs I had laying around. I was able to reuse the stock links with some creative changes to the mounts. And then here's what it looks like:

P1010683.jpg


P1010684.jpg


Next, I cut the frame in half and took about 3.5" of frame rail out:

P1010690.jpg


Then I built a swivel mechanism, pretty much the same as I did on the Swivel Frame Power Wagon I did a few years back. It uses 3/4" Delrin bar, cut to length to slide inside the frame rails, with a bolt through the middle and a bearing in between:

P1010685.jpg


P1010688.jpg


Then the swivel mechanism goes into the frame and you get something like this:

P1010691.jpg


And "flexes" like this:

P1010692.jpg


Next step will be to clean everything up, then install the driveline.

As far as the body is concerned, I will be using the Knight Hauler body, and cutting it in half just behind the doors. The front portion will go in front of the swivel. The roof extension will stay off, and I will use styrene to make a clean flat roof. In addition, I will be chopping the top, to make it slightly shorter and give it the hot rod look. The sleeper part of the cab will be mounted behind the swivel, extended to run the whole length of the rear frame, height matched to the roof line, and have wheel wells cut out of the bottom to clear the tires. Here's the stock body all marked up for my cuts:

P1010689.jpg


As I said, this won't be moving very quickly, but I'm very excited about the end result! "thumbsup"
 
I got a little more done. Mounted the transfer case (after recessing the bolt head into the swivel):

P1010696.jpg


Then mocked up the best way to fit the transmission:

P1010697.jpg


P1010698.jpg


Scrounged some High Lift (I think) drive shafts I had lying around. One will work as is, but two need to be shortened. Unfortunately, these have the pins on both ends, not one pin, one flat. That is going to make shortening them much more of a pain. Anyone have any suggestions???

P1010699.jpg
 
I got the beadlock rings painted to match the body last night. I will be using Axial 1.9 wheels and Pro-Line Flat Iron tires. Now to put them all together... ugh.

P1010709.jpg
 
Got the wheels and tires put together:

P1010710.jpg


And bolted them on (starting to come together now):

P1010716.jpg


P1010717.jpg


A picture with some rear suspension flex and some frame swivel going on:

P1010711.jpg


And a shot with the unmodified body sitting on top:

P1010722.jpg


I plan to keep the body sitting as low as possible, since the majority of the flex is actually going to be swivel. With the chop, it should look pretty slick. Now to tackle the drive shafts so I can put some electronics in this thing and make it a runner!
 
Nice build so far, I like the swivel frame concept. I'd like to offer an idea, if you counter bored both of the delrin cross members so the bearing was recessed, it would close the gap between the frame rails and it would cut down lateral flex because the delrin cross members would basically rub against each other.
 
Nice build so far, I like the swivel frame concept. I'd like to offer an idea, if you counter bored both of the delrin cross members so the bearing was recessed, it would close the gap between the frame rails and it would cut down lateral flex because the delrin cross members would basically rub against each other.

I thought about that, but there is really no lateral flex. I bet I could put 100lbs right on top of the swivel and it would hold easy. The first thing to go will be ripping the entire swivel assembly out of the frame rail. The only thing I would do by bringing the two frame halves closer together is risk binding.
 
looks great, but have you thought about liminting how far it can swivel? because you could run into some drive line binding and just plain swivel too far around and flip easier
 
So what kind of rig are you emulating here? Looks great, but the chopped top kinda threw me off. :)

Emulating? I don't think I have ever seen a 1:1 close to what I am doing. I guess I would be emulating a combination of a swivel frame Power Wagon and a Dakar T5 truck...
I agree, the chop top is a little strange, but I'm not chopping a ton. I just want to keep the height down as much as possible.
 
looks great, but have you thought about liminting how far it can swivel? because you could run into some drive line binding and just plain swivel too far around and flip easier

Yes. Actually, this will be limited by the drive shaft yoke. The front half of the rear drive shaft yoke on the transfer case will hit the rear brace of the swivel at about 30 degrees swivel. I laid it out that way on purpose so it won't rotate all the way around. There will be no binding, as the smooth round metal yoke will still turn while in contact with the smooth flat delrin brace.
 
Yes. Actually, this will be limited by the drive shaft yoke. The front half of the rear drive shaft yoke on the transfer case will hit the rear brace of the swivel at about 30 degrees swivel. I laid it out that way on purpose so it won't rotate all the way around. There will be no binding, as the smooth round metal yoke will still turn while in contact with the smooth flat delrin brace.
sounds good!"thumbsup"

cant wait to see it running!
 
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