Project Quadrotrac

Steinbruchsoldat · Mar 24, 2014

Stupid thumb is annoying me. Makes me insanely slow and i really hate that... :mad3:

Managed to fabricate some parts for the right axle today:

BigAl · Mar 24, 2014

You sure do beautiful work . Very impressly

Steinbruchsoldat · Mar 27, 2014

Thanks. I really would like to progress as fast as usual, but my stupid thumb slows me really down, also my granddad passed away last week... :sad:

But i got the plastic for the sprockets today:

dave_dj1 · Apr 1, 2014

Sorry about your granddad. The project looks so cool, keep up the good work.
Dave

Steinbruchsoldat · Apr 8, 2014

Thanks Dave.

Played a bit with Sketch Up. This is the rear car model:

Cage will be 2x2" tubing. What wall should i use? Is 0,157" enough or should i go 0,196". Does it need more triangulation? Like a x in the rear? Front will the tied in the joint.

NorthernRedneck · Apr 8, 2014

There was a larger scale machine with a track setup similar to what you're designing. The machine was basically a skidder on four tracks with the sprocket on the outside of the track. Wish I could find the thread.

redsqwrl · Apr 8, 2014

If your machine is rigid enough for the stress involved in your steering and loading purposes, I would forgo the X bracing.
I am not a mechanical engineer by any measure. with that said I am very familiar with the FIA regulations of caged race cars. The incident of tipping over can be a violet endeavor, so ask your self if the cage is for incidental contact with trees and brush or are you intentions to protect your self in a uncontrolled slide or fall.

If you have potential to fall and need some triangulation smaller elements make a large difference.

Sorry to hear of your loss. (Grand fathers are just that Grand)

Steinbruchsoldat · Apr 9, 2014

NorthernRedneck said:
There was a larger scale machine with a track setup similar to what you're designing. The machine was basically a skidder on four tracks with the sprocket on the outside of the track. Wish I could find the thread.

I think you're talking about the Katrak. This was a 2ton machine with 2 tons payload. Got a few pictures and a sales brochure if you're interested.

redsqwrl said:
If your machine is rigid enough for the stress involved in your steering and loading purposes, I would forgo the X bracing.
I am not a mechanical engineer by any measure. with that said I am very familiar with the FIA regulations of caged race cars. The incident of tipping over can be a violet endeavor, so ask your self if the cage is for incidental contact with trees and brush or are you intentions to protect your self in a uncontrolled slide or fall.

If you have potential to fall and need some triangulation smaller elements make a large difference.

Sorry to hear of your loss. (Grand fathers are just that Grand)

I want this thing to be bulletproof. I want to drive it offroad and test it's limits, and theres quite a possibility of it tipping over. But i'm working on a dimple die press right now, that will help to built some sheetmetal gussets.

Knocker of rocks · Apr 9, 2014

Steinbruchsoldat · Apr 9, 2014

Was busy working on my mill. Added a vertical milling head and a new vfd. Need to finish wiring it tomorrow and then i`m back on track on the Quadrotrac:

Some time ago our old mini excavator went to the scrapyard:

Unfortunately i wasn`t allowed to safe the cab. But i started looking for one to buy and found one today. Going to inspect and hopefully bring it home tomorrow:

This is a lot cleaner and easier than building my own. This way i have a real door, sliding windows and all that stuff. It even has a sunroof...

JimVT · Apr 10, 2014

I found this old post of a small single one the size of yours.
http://www.forumsforums.com/3_9/showthread.php?t=21742

Steinbruchsoldat · Apr 10, 2014

Thanks for the link, looks quite interesting.

Had a look at the cab today. Well, it fit`s right on. Exactly as wide as the frame and only 4" longer. I`d call that a perfect fit. This is why i bought it. Otherwise i wouldn`t, because it`s in worse shape than it looked at the pictures. Going to see how worse it really is when i steam clean it tomorrow:

NorthernRedneck · Apr 10, 2014

I can envision something along the lines of one of these cabs working on your machine.

Snowtrac Nome · Apr 10, 2014

of course a Canadian would show us a pic of a bombardier, instead of something like a holder which may be more plentiful over in Europe

Snowtrac Nome · Apr 10, 2014

Steinbruchsoldat · Apr 10, 2014

Well, you guys are a little bit late, as you can see in post #42, i bought a cab today. :whistling:

Snowtrac Nome · Apr 10, 2014

I just had to put up the holder post to poke at northern redneck a bit life's not fun if you are serious all the time.

Steinbruchsoldat · Apr 10, 2014

Sure, just thought you guys missed this post.

Anyone got an idea how to attach something like a boom to it?

Snowtrac Nome · Apr 10, 2014

I know on the other hand you couldn't go wrong with the holder cab. they have their own built in rops, they are roomy quiet, and comfortable, those little bombardier or trackless cabs are crude compared to the holder products

undy · Apr 10, 2014

Stein,

Nice score on the cab.

Any chance you can build a mount for the arm underneath the seat area? You have to have something to mount the cab to anyway, and I can't imagine the cab itself is strong enough to support the arm.

Steinbruchsoldat · Apr 11, 2014

Snowtrac Nome said:
I know on the other hand you couldn't go wrong with the holder cab. they have their own built in rops, they are roomy quiet, and comfortable, those little bombardier or trackless cabs are crude compared to the holder products

They're all way to wide. My cab has rops too, but i'll built a cage anyway.

undy said:
Stein,

Nice score on the cab.

Any chance you can build a mount for the arm underneath the seat area? You have to have something to mount the cab to anyway, and I can't imagine the cab itself is strong enough to support the arm.

Thats not going to work. Can't go any wider than the cab because of the bogie tracks. They would interfere when articulating.

Steinbruchsoldat · Apr 11, 2014

Started by steamcleaning the cab today:

Came out better than i thought it would:

Just the sheetmetal where the door hinges were is rusted out, everything else is going to be replaced either way or is in good condition.

Then i put it on the chassis table:

It`s a perfect fit, i`m a happy camper.

There are just a few things that i`m going to change. First is to square up the left side of the cab:

There will be a small window on the rear left body part:

And i need to shorten the door a bit to clear the drive sprocket:

Probably moving back the cab a bit on the frame to make room for some front hydraulics without sacrifiing aperture angle. Don`t see any possibility to incorporate a boom but if someone got an idea i`d like to hear it.

Steinbruchsoldat · Apr 11, 2014

So, here`s the final plan:

Snowtrac Nome · Apr 11, 2014

see that northern wedneck. he even has it painted holder orange, not bombi yellow

redsqwrl · Apr 12, 2014

SteinB, I can't let the boom idea go..... Mostly because I see myself wanting one some day. (my project is two 2100 thiokols mated in a similar fashion.

Could the arm be a "jib" like the photo
its base would be the pivot point or waist of the machine.
an automobile rack and pinion could rotate it.
Two anchor points one at the base one at the top of the cab (you mention a ROP)
not sure a auto rack can go 360 degrees but the arm could double back on itself for storage.

hell it could even nest on the rear car

Steinbruchsoldat · Apr 13, 2014

Snowtrac Nome said:
see that northern wedneck. he even has it painted holder orange, not bombi yellow

It actually will be painted a bright orange.

redsqwrl said:
SteinB, I can't let the boom idea go..... Mostly because I see myself wanting one some day. (my project is two 2100 thiokols mated in a similar fashion.

Could the arm be a "jib" like the photo
its base would be the pivot point or waist of the machine.
an automobile rack and pinion could rotate it.
Two anchor points one at the base one at the top of the cab (you mention a ROP)
not sure a auto rack can go 360 degrees but the arm could double back on itself for storage.

hell it could even nest on the rear car

Can`t let this idea go, too. But i don`t want to built a real crane, more likely something like a bobcat or front end loader.
Would really like to do a bobcat type boom, this doesn`t really make the vehicle bigger but adds a lot of versatility.

Steinbruchsoldat · Apr 15, 2014

Finished the mill:

Now it`s time for the Quadrotrac again. Started by cutting the mounts for the right axle:

Had to redo the main beam because i used a 5mm instead of 4mm wall tubing an the slide out wouldn`t go in:

Track tensioner:

Turned down the wheel bearings, because the center was to big:

Fit`s great:

Right axle:

Bolted on the bogie bushings:

And tacked on the axle:

Tried to get the whole thing on a picture:

Then i started with the clutch. Will convert it to a hydraulic system. But there`s not enough room on the transmission, so i have to use the oem cable:

Did some math for the leverage:

Started witht the mount:

And the lever:

Had to mill down the rear side of the slave cylinder because there was still the rough casting:

Steinbruchsoldat · Apr 15, 2014

Can`t let the boom idea go. There`s some room on the right of the cab where i could mount a strong mounting beam:

Boom would be like this:

This is the first sketch:

Would like to hear some thoughts...

Steinbruchsoldat · Apr 16, 2014

Wasted a lot of time trying to get the clutch working before i quit and decided to just use a longer cable.

Then i started building the cage:

Steinbruchsoldat · Apr 17, 2014

Continued working on the cage today:

This is why i love my coldsaw:

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