Articulating 4X4 design

samckitt · #1 01-08-2013, 01:29 PM

I recently purchased a 1711 roller to use for my 4X4 articulating project. Thought I may be able to use the frame, but looks like I will be making a custom frame instead. And before I find an engine I am not cutting anything, so instead I have been play designing it in the CAD system I have used for years. Some dimensions are right, some are close & some are SWAG.

Scot

ACecil · #2 01-08-2013, 01:36 PM

That is neat! Looking forward to your progress on this project.

Methos · #3 01-08-2013, 01:53 PM

Quote:

Originally Posted by ACecil

That is neat! Looking forward to your progress on this project.

Same here!

Sugarmaker · #4 01-08-2013, 05:42 PM

samckitt,
Nice CAD modeling on the 4x4! What system are you using? I am thinking about getting back into CAD design (Auto Cad Inventor). Wish me luck I think should know in a week or so. I still dabble using Google Sketch up from time to time for detailed projects.
Regards,
Chris

samckitt · #5 01-08-2013, 06:14 PM

I am using software called NX, formerly called Unigraphics.

Scot

samckitt · #6 01-09-2013, 06:44 PM

Design question on an articulating tractor for you all. In the images below, the "true" pivot point between the two halves are different, the yellow vector indicates where the pivot point would be.. In design 1, it is closer to the front half, design 2 is closer to the rear half. With design 1 I feel when turning the tractor, the seat area would be kicked out side to side, where design 2 the seat area would be more inline with the pivot point & would just pivot more instead of being kicked out side to side.

What do you think?

Design 1:

Design 2:

I know, I am probably over thinking this.

Thanks,
Scot

Oak · #7 01-09-2013, 08:35 PM

Scot, looks good but wouldn't that frame also have to twist? Like when one front wheel is higher that the other. Probably a word for that but I rode the short bus to skool.

samckitt · #8 01-09-2013, 09:14 PM

Quote:

Originally Posted by Oak

Scot, looks good but wouldn't that frame also have to twist? Like when one front wheel is higher that the other. Probably a word for that but I rode the short bus to skool.

Yep Oak, already in the design. In the picture below, inside the red circles are spherical joints, & inside the green circle is a solid welded connection.. This allows it to turn or steer where the two spherical joints are in line vertically & the third spherical joint allows it to twist.

From above you can see here where it will steer.

In these you can see that it will rock to allow for difference in terrain.

Scot

samckitt · #9 01-11-2013, 05:18 PM

Been tinkering with my design some & use some of the stock parts with a new frame. Going to try to use the battery tray & the dash pedistal.

Scot

Matt G. · #10 01-11-2013, 05:56 PM

If I were you I would study how the pivot and driveshaft between the two transaxles is designed on an articulated farm tractor. Just looking at your pivot I think you are going to have a lot of trouble with a driveshaft that will work, as it will have to telescope and need 2 U-joints. With as many degrees of freedom as that pivot has, I would bet the the driveshaft is going to want to bind.

A lot of people have made articulated Cub Cadets, so an internet search for some pictures would probably be a good idea as well if you haven't already. Lots can be learned from what has already been done.