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Subject Topic: A little 8 wheeler Post ReplyPost New Topic
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stanz
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Posted: 05 - February - 2008 at 12:44 | IP Logged Quote stanz

Have you ever seen the rear swing axles on an old rear engined Fiat or VW?  Just like that!  Let me see if I can rustle up a picture.

Quote: METAL MOOSE
i understand the chain and bogie assembly, but how would you build the side axles?
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stanz
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Posted: 05 - February - 2008 at 13:03 | IP Logged Quote stanz

Okay, I found a drawing of a swing arm and axle hub.  Bolt the two flanges to a housing that runs from the front wheel to the rear.  Chain drive on the inner side of the hub.


The flange is strong enough to support the axle on one side, at least it was on my Fiats.  I think VW used something a little different.  I don't remember it's been 28 years or so since I've owned a VW Bus.

Does that help?


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f350ca
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Posted: 05 - February - 2008 at 13:47 | IP Logged Quote f350ca

It looks like their walking beam is a small version of whats used on a road grader. They use a chain drive but I have no idea what is used for a tensioner. 

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camdigger3
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Posted: 05 - February - 2008 at 15:08 | IP Logged Quote camdigger3

That's exactly what I had in mind.  A walking beam tandem rear like a road grader...

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Design to 0.001", measure to 1/16", and cut with an axe......
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tom
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Posted: 05 - February - 2008 at 22:36 | IP Logged Quote tom

I have done my share of road graders, They use two 100 chains one to each wheel  with center drive Axel and no tensioners.
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nylli
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Posted: 06 - February - 2008 at 00:42 | IP Logged Quote nylli

I took a snapshot from one of the movies to get the pivot,
and it looks pretty easy to make. here is the pictures.






Edited by JoeJ on 07 - February - 2008 at 06:56
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camdigger3
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Posted: 06 - February - 2008 at 07:35 | IP Logged Quote camdigger3

Nylli

That joint shouldn't be too hard to make, but that design will probably require some basic machining for the pivot.  To me, it looks very similar to this..

 

Note the grease fitting to the right of the bolted flange, it is for the pivot joint that lets the front and rear section "walk" over obstructions and is where the machining was done.  I made a cartridge to slide in to deal with maintenance.  The pivot is a 2" (52 mm) OD bar inside a flanged sleeve with a collar on the inboard end for a retainer.  The main difference I can see is the C in the image here is only 3" (76 mm) high while the one shown in your screen capture is almost twice that wide.

Cam



Edited by camdigger3 on 06 - February - 2008 at 07:38


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nylli
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Posted: 06 - February - 2008 at 09:25 | IP Logged Quote nylli

It's also the same system that i made on my cadtrac, I think they are
stronger if the C is a little wider.

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jimw
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Posted: 06 - February - 2008 at 09:59 | IP Logged Quote jimw

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jimw
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Posted: 06 - February - 2008 at 10:02 | IP Logged Quote jimw

  Above pic is how it did mine. Its a Jeep 4x4 front end outer hub. Drive

shaft runs right thru the middle. Original wheel hub provides 360 degrees

of swivel if needed. Drive shaft on right is where the locking hub would

normally be. I found a yoke with the same splines and plugged it in.

Jim

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stanz
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Posted: 06 - February - 2008 at 10:19 | IP Logged Quote stanz

Um, Jim, you don't get away that easy ... show us your tractor! 

We need pictures!

I like the through the axle drive shaft idea.  It's actually cleaner than the unit we're talking about on this thread.


Quote: jimw

  Above pic is how it did mine. Its a Jeep 4x4 front end outer hub. Drive

shaft runs right thru the middle. Original wheel hub provides 360 degrees

of swivel if needed. Drive shaft on right is where the locking hub would

normally be. I found a yoke with the same splines and plugged it in.

Jim

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f350ca
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Posted: 06 - February - 2008 at 13:53 | IP Logged Quote f350ca

Tom,
Wondered if that was what they did. On a similar line of thought, am thinking about building a small mechanical drive off road truck, sort of rock truck looking thing. Tandem rear end, articulated, with tilting front axle.
I imagine a grader as having a more constant load on the drive than a off road vehicle. Wonder if the chains would slap too much as you roll over obstacles or come on and off power. To worsen the effect I was thinking of using a single driveline brake.


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jimw
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Posted: 06 - February - 2008 at 14:35 | IP Logged Quote jimw

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jimw
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Posted: 06 - February - 2008 at 14:43 | IP Logged Quote jimw

  Couple pics. Machine is 4 wheel drive, articulates and swivels. Runs on 35

inch tall 700x20s redrilled to fit 5 on 5.5 drums. Powered by a 13 hp Honda,

runs a hydraulic pump which powers a hydraulic motor thats reduced 4 to1into

a 4 speed trans, then reduced again 4 to 1 to the drive shaft which powers

front and rear drives. Has a winch powered hoist on the back simaler to a

three point hitch. Used for lifting logs off the ground to haul in for firewood.

Back body can also hold a fair amount of firewood.



Edited by jimw on 07 - February - 2008 at 09:33
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jimw
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Posted: 06 - February - 2008 at 14:46 | IP Logged Quote jimw

  Here is the rear log hoist, will lift a number of logs up off the ground.

Have trailer hitches front and rear.

Jim

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jimw
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Posted: 06 - February - 2008 at 14:49 | IP Logged Quote jimw

  Side veiw.

Its a work in progress, but it runs, works and drives well.



Edited by JoeJ on 07 - February - 2008 at 06:55
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blackdog_006
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Posted: 06 - February - 2008 at 15:09 | IP Logged Quote blackdog_006

Thats a nice lookin iron oxide painted machine Jim

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jimw
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Posted: 06 - February - 2008 at 15:11 | IP Logged Quote jimw

   Not ready for real paint yet, figured somebody would pick up on that.

Jim

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camdigger3
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Posted: 06 - February - 2008 at 15:29 | IP Logged Quote camdigger3

Don't worry about the color Jim!  After all rust is a color! 'sides, it would be tragic to mess up a new paint job doing a modification.

I can't tell exactly how the steering is done.  It looks like you've used a conventional sttering box and simply fabbed a link?

Cam

 



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jimw
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Posted: 06 - February - 2008 at 15:42 | IP Logged Quote jimw

Cam

 You are correct, i readjusted the steering box and pitman arm to fit

and made an adjustable tie rod to steer it. Plans for hydraulic power

to it later.

Jim

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