Quadrotrac

[Steinbruchsoldat]

Hi guys,
i decided not to continue on the Mini Hägglund but built this one instead. It`s loosely based on a vehicle made by Katrak:

I`m not a CAD guy, so here`s the first drawing:

I`m trying to keep this as small and lightweight as possible. Should end up pretty exactly as small as a Polaris.

Power will be belivered by a 3cyl 50hp Subaru engine. It`s from a Justy that was 4WD. Since i´m going to mount it lenghtwise and only using the left and right cv output to power the front and rear car the driveshaft flange for the former rear axle remains useless. I can engage power to it by vacuum. Anyone has any idea what to use this for? Otherwise i`m just going to remove it. I`m going to use the standart five speed. The engine and everything related will be on the rear car. Need to think of something to engage the shift levers. Clutch shouldn`t be a problem, i`ll just convert it to hydraulic engagement. Power to the rear car will go through a chain drive and two short shafts to the rear axle. Power ro the front car with a shaft that goes throught the articulated joint. I`m going to use Suzuki SJ 413 rear axles that will be shortend to get the diff in the middle and accept two short shafts.
Suspension will consist of boogie axles using 4.00/8 tires. The boogie axles will be mounted on the drive axle tubes by some sort of bushing, need some ideas on that.

Will have articulated steering by two hydraulic rams and an engine driven hydraulic pump.

Here are the tracks i`m going to use:

Steering rams:

And the engine and transmission:

At the moment i`m collecting ideas and trying to draw some stuff this time before i build it and notice something doesn`t work out...

 

[deepmud]

Subscribed.

Starting over is ok. I'm glad you didn't continue put a huge amount of effort in only to find it's too heavy. It's hard to keep putting time in like you do. You remind me of Grant Stockley (Logjam on Pirate) and his amazing home-built stuff .

 

[Steinbruchsoldat]

Thanks man.


Started by parting out the Hägglund today. This is how it sat:

Removed my bandsaw from it`s stand and used it as a portaband to cut the cage of. Worked great despite the saw beeing pretty heavy:

Cage removed:

And cut:

When this`ll be done i`ll rearrange some machines in my shop. I also bought about 82 feet of 4,7"x 3,1" rectangular tubing that i`ll use to build a chassis table first. I`ll also use it to build the frame and boogies out of it.

 

[java]

Subscribed! Sad to see the hagglund getting chopped though!

 

[Paul_H_UK]

subscribed can't wait to see how this one turns out

 

[4xdog]

This one should be as much fun as the last one.

In case you haven't seen them, steinbruchsoldat, you might want to read through these two threads on the excellent Garage Journal Forum. You may find a few ideas, and you're sure to be entertained.

http://www.garagejournal.com/forum/showthread.php?t=228821
http://www.garagejournal.com/forum/showthread.php?t=132812

 

[VanIsle_Greg]

And subscribed...

Looking forward to a new build. The last one was pretty kool, but knowing when to throw in the towel and start over is a good thing.

 

[Steinbruchsoldat]

Thanks guys. Really excited myself to see how this turns out.

Pulled the engine and removed the frame:

All gone:

Then i started reorganizing the shop. Started with the bandsaw:

Belt sander:

Power hacksaw and grinder mount:

Cold saw:

Mounted the grinders:

So this is the fabricating/machining corner:

Got some room to work on the Quadrotrac:

 

[chilliwak]

I am happy to see you starting on a new project Steinez. I was wondering what happened to the Håglund, and now I guess I have my answer. I am just curious why you would put the power in the rear unit and not in the front. Maybe you can explain this to me? Cheers, Chilli....

 

[Steinbruchsoldat]

I sure cab. Since i`m trying to keep it as small as possible so there`s just not enough room for the engine and everything and myself. So on the front car should be enough room for myself and a passenger and the rear car is the power unit.

Those will be the steering rams, i already machined the mounts:

The hydraulics:

Some shafts to work with:

And here`s the start. I`m probably going to build some sort of a winch gantry on the ceiling:

 

[chnlisle]

Love the Baden-Wurttemburg safety shield. I had a lot of fun in that area way back when.

 

[Steinbruchsoldat]

You mean the license plates? Where did you stay?

Picked up the steel for the frame, boogie axles and chassis table:

 

[Steinbruchsoldat]

So i started working on it today. First i picked up the Samurai axles. We had to build two matching ones with 3,7:

Everything i got:

First i ground of all that unneccesary crap :

Cut of the wheel bearing seat:

Turned down the weld:

Came right off with a single blow of a hammer :

Did some measurements and and cut the axle tube:

Tacked the bearing set back on:

Now i had all the measurements i needed and started cutting some steel:

Put everything in the Motodog and drove to a buddy to get everything flat and squared up and welded together on his awesome welding table :

Back home:

The legs finished:

Chassis table finished for now, going to add some wheels to it:

Also made something like a gantry crane (how to call this thing?) to get the engine positioned easy:

 

[krl81]

Lovely to see you back on a project. I started reading the Hägglunds thread a couple if days ago so I just recently found out that you stopped work on that.
I must say I'm just amazed by your skills and ingenuity.
I was thinking of the not-used-rear-axle-output. What about a winch or a small crane for lifting stuff? Just an idea. Our put a pulley on it and connect it to an air compressor. Don't know if that's to any use for you but as I said, just ideas.
Keep up the great work and I'm subscribing this thread right now. and if I miss something I found you on FB.

 

[Steinbruchsoldat]

Thanks man. I can`t use that output for that, because it`s only driven when the car is driving. It`s also reversed when backing up.


Started cutting the frame rails today:

Cut holes for the axles:

Had to pull the axle shafts but didn`t have the right tool, so i made one:

Placed the axle in the frame:

I need for bushing seats on the axle tube, so i put the axle in the lathe and started turning:

Unfortunately the axle is bent a abit and isn`t running true. I would cut the the tube on one side before even touching on the other. So i decided to build it up by welding and turning it down:

IUnfortunately i missed a spot while welding so i wanted to weld it up after it was turned down and turn it down again. Looks like i bent it in the other direction while welding up that small spot. So it wasn`t sucessfull and i need to redo it. Anyone have a better idea? If i weld it again it`s quite possible that i miss a spot again and the same stuff happens again. So i`m really hoping someone can give me a hint.