Vintage Steam Tractor Miniature

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ppemawm
Posts: 224
Joined: Fri May 17, 2013 3:54 pm
Location: Manhattan New York

Vintage Steam Tractor Miniature

Postby ppemawm » Tue Feb 21, 2017 5:50 pm

I built this model just for fun from plans available on http://www.john-tom.com/html/SteamPlans.html. The model is a vintage Case tractor manufactured circa 1800's that has a wood fired boiler and steam engine. It is fascinating to me that some originals are still around in fully operating condition as well as many miniatures created by hobbyists which you can find on the InterWeb.

The assembly, with the exception of the gears, was created in one file primarily using the PartDesign workbench. The gears were created in a separate file and imported last as .STEP files. Trying to work on the gears in the master file slowed FreeCAD to an unbearable crawl even with an I7 Quad Core CPU.

Steam_Tractor-Left.JPG
View showing the single piston steam engine cylinder and crankshaft assembly
Steam_Tractor-Left.JPG (281.28 KiB) Viewed 1791 times

Steam_Tractor-Right.JPG
View of the multiple gear reduction drivetrain used for the rear wheels
Steam_Tractor-Right.JPG (289.51 KiB) Viewed 1791 times

Steam_Tractor-Front_Rear.jpg
Front and rear views. The two boxes in the rear are for firewood required for the boiler!
Steam_Tractor-Front_Rear.jpg (231.57 KiB) Viewed 1791 times

Most of the parts were fairly straight forward to model except perhaps for the worm-gear drive steering assembly that includes crossed chains to turn the front axle. The boiler with the three(3) condensate return tubes was also quite a challenge to create strictly with PartDesign but possible. All of the fasteners are not included but a few of the rivets were modeled for visual effect only. File size is about 31 Mb for the assembly and 21 Mb for the gears both of which I can post on DropBox if anyone is interested in more detail.

Steam_Tractor-Detail1.JPG
Closeup view of the steam engine and valve control mechanism.
Steam_Tractor-Detail1.JPG (144.62 KiB) Viewed 1791 times

Steam_Tractor-Steering.JPG
Detail of the worm-gear and chains used for steering.
Steam_Tractor-Steering.JPG (135.04 KiB) Viewed 1791 times

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6706 (Git)
Build type: Release
Branch: releases/FreeCAD-0-16
Hash: f86a4e411ff7848dea98d7242f43b7774bee8fa0
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17
paulfurze
Posts: 12
Joined: Fri Oct 28, 2016 11:59 am

Re: Vintage Steam Tractor Miniature

Postby paulfurze » Tue Feb 21, 2017 5:53 pm

This is just wicked !
Well done.
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Chris_G
Posts: 350
Joined: Tue Dec 31, 2013 4:10 pm
Location: France

Re: Vintage Steam Tractor Miniature

Postby Chris_G » Tue Feb 21, 2017 6:46 pm

Wow ... really impressive ( except some of your color choices :lol: )
chrisb
Posts: 1630
Joined: Tue Mar 17, 2015 9:14 am

Re: Vintage Steam Tractor Miniature

Postby chrisb » Tue Feb 21, 2017 8:57 pm

Impressive, thanks for sharing.
As a sidenote I would like to remark that the steering is not in a working condition: for steering straight both chains are half wound on the steering mechanism. When the steering wheel is turned, one side is unwound, the other is wound up. So this is probably the factory delivery state with a blocked steering.
triplus
Posts: 4833
Joined: Mon Dec 12, 2011 4:45 pm

Re: Vintage Steam Tractor Miniature

Postby triplus » Tue Feb 21, 2017 9:03 pm

Looking good.

P.S. I remember somebody was building replica of a similar thing in the past and made some forum threads about it. But i don't know if the project was ever finished or not.
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kkremitzki
Posts: 316
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Location: Texas

Re: Vintage Steam Tractor Miniature

Postby kkremitzki » Wed Feb 22, 2017 1:54 am

This is great, it reminds me of some of the old tractors I saw at my agricultural engineering department's centennial recently:
http://2o9kb51xfph91b7rki281uu9.wpengin ... 0915-2.jpg

Could you share a link to the files on Dropbox like you mentioned? I'm really hoping to use FreeCAD for a machine design class this fall and I think a model like this would be a great selling point. (Although a timely 0.17 release would be needed too :D )
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ppemawm
Posts: 224
Joined: Fri May 17, 2013 3:54 pm
Location: Manhattan New York

Re: Vintage Steam Tractor Miniature

Postby ppemawm » Wed Feb 22, 2017 2:10 pm

chrisb wrote: for steering straight both chains are half wound on the steering mechanism

Thanks for pointing that out. You are so correct, but I was not about to try and model a helical chain. I had enough of a task to accurately create chains from point A to point B in a straight line and connect them to four eyebolts in 3D space!

Maybe someone or I should take that as a challenge. :(
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ppemawm
Posts: 224
Joined: Fri May 17, 2013 3:54 pm
Location: Manhattan New York

Re: Vintage Steam Tractor Miniature

Postby ppemawm » Wed Feb 22, 2017 2:21 pm

kkremitzki wrote:Could you share a link to the files on Dropbox

Here are the links:
Gears--
https://www.dropbox.com/s/s12aybhpl6myr ... FCStd?dl=0
Master assembly--
https://www.dropbox.com/s/lfccc3y9h784d ... FCStd?dl=0

Be patient, it may take a minute or two to open these large files.

Feel free to use for whatever purpose. Hopefully the files are not too confusing.
Comments and questions are welcome.
leredop
Posts: 3
Joined: Fri Mar 03, 2017 11:00 am

Re: Vintage Steam Tractor Miniature

Postby leredop » Fri Mar 03, 2017 11:10 am

Chris_G wrote:Wow ... really impressive ( except some of your color choices :lol: )


Hi Chris_G,

completely agree great model and very funny colors!))) :D
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NormandC
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Joined: Sat Feb 06, 2010 9:52 pm
Location: Québec, Canada

Re: Vintage Steam Tractor Miniature

Postby NormandC » Sat Mar 04, 2017 10:53 pm

Late reply of mine to say that as usual, your model is awesome - and your patience for building it to be commended! :)

Regarding use of colours in 3D models, I once read that engineers choose colours rather randomly to differentiate parts from each other; while designers will try to choose colours that most represent the part's finish in real life.

I'm in the second category. :D