DIY Home built compact tractor

chrisser · Dec 11, 2007

BTW, here's an interesting site Tractor Page 2 - its electric, but some good pics

GT2 · Dec 11, 2007

chrisser said:
GT2,

I'm new to the board, and joined specifically because of this thread.

I was searching the web for people building their own tractors. They are few and far between, and your thread is by far the best example.

Thanks for sharing it with everyone. Great info and pics - I sometimes check in twice a day to see your progress and read the comments.

- Chris

Thanks for the coments Chris, and welcome aboard!

Renze · Dec 11, 2007

DRL said:
FWD tractors can turn sharper than trucks because of how the knuckle is designed. They don't use U-joints, they use 2 pairs of bevel gears. One pair goes from the axle shaft to a short vertical shaft going down and the other pair from the bottom of that shaft to the horizontal spindle.

That's only in toy tractors like Kioti and Kubota. The only farm tractor using a driven front axle with this design is Belarus, all the other larger tractors use double U joints. Some of them might be using homokinetic joints like fwd cars.

GT2 · Dec 11, 2007

Renze said:
That's only in toy tractors like Kioti and Kubota. The only farm tractor using a driven front axle with this design is Belarus, all the other larger tractors use double U joints. Some of them might be using homokinetic joints like fwd cars.

Homokinetic?
Did something get lost in the translation?

( or maybe I'm ignorent)
Over here we call them constant velosity joints or CV joints.

rpoage · Dec 11, 2007

GT2 said:
Homokinetic?
Did something get lost in the translation? ( or maybe I'm ignorent)
Over here we call them constant velosity joints or CV joints.

Title:Universal homokinetic joint Document Type and Number:United States Patent 4238936 Link to this page:Universal homokinetic joint - Patent 4238936 Abstract:Homokinetic joint of the type in which the torque is transmitted between two ends by balls engaged in races or tracks made in said ends.
Each track is constituted by two semi-cylindrical grooves, the sectional diameter of which being oriented relative to a radial axis passing through the geometrical center of the joint and perpendicular to the longitudinal axis of said two ends. The balls are thus made to roll and to be guided between two poles located on the radial axis and two other poles located on an axis perpendicular to said radial axis. Said arrangement excludes the use of any intermediate means for maintaining the balls on the bisecting plane of the joint.

The invention is particularly adapted to realize the two-joints transmission assembly for a vehicle.

I say Homokinetic, you say CV Joint / You say Potato, I say Potato

GT2 · Dec 11, 2007

rpoage said:
Title:Universal homokinetic joint Document Type and Number:United States Patent 4238936 Link to this page:Universal homokinetic joint - Patent 4238936 Abstract:Homokinetic joint of the type in which the torque is transmitted between two ends by balls engaged in races or tracks made in said ends.
Each track is constituted by two semi-cylindrical grooves, the sectional diameter of which being oriented relative to a radial axis passing through the geometrical center of the joint and perpendicular to the longitudinal axis of said two ends. The balls are thus made to roll and to be guided between two poles located on the radial axis and two other poles located on an axis perpendicular to said radial axis. Said arrangement excludes the use of any intermediate means for maintaining the balls on the bisecting plane of the joint.

The invention is particularly adapted to realize the two-joints transmission assembly for a vehicle.

I say Homokinetic, you say CV Joint / You say Potato, I say Potato

See I am ignorent.
Next time my front wheel drive car has a clicking axle I'll be sure to ask for a new Homokinetic joint!

( I just wanted to say Homokinetic again)

DRL · Dec 11, 2007

Renze said:
That's only in toy tractors like Kioti and Kubota. The only farm tractor using a driven front axle with this design is Belarus, all the other larger tractors use double U joints. Some of them might be using homokinetic joints like fwd cars.

Wonder how many guys make a good living with "Toy" tractors like Kubota.

DRL

rpoage · Dec 11, 2007

GT2 said:
( I just wanted to say Homokinetic again)

Be careful what part of town you are in when you say that. It could get you in a bar fight or propositioned?

Defective · Dec 11, 2007

GT2 said:
Thats it? How come I'm not done yet?

That'd be because the backhoe is missing from that list...

Robert_in_NY · Dec 11, 2007

DRL said:
Wonder how many guys make a good living with "Toy" tractors like Kubota.

DRL

Don't take offense, I am sure none was meant and is said in fun.

john_bud · Dec 11, 2007

GT2 said:
Thats it? How come I'm not done yet?

Obviously, you've been spending too much time at the mall Christmas shopping!

I know if it was me, that list would get cranked out by the first week of January..... 2211!

jb

DRL · Dec 12, 2007

Robert_in_NY said:
Don't take offense, I am sure none was meant and is said in fun.

Same here

DRL

jimmer2880 · Dec 12, 2007

There are 2 ways to make a tractor have a smaller turn radius. One, is to have the wheels turn more (front, or back).

But, another way, is to shorten the wheelbase. So, if you aren't able to make the wheels turn more, why not shorten the WB if you can. You won't be sorry, unless you shorten too much and now can't carry anything in the FEL

chrisser · Dec 12, 2007

jimmer2880 said:
There are 2 ways to make a tractor have a smaller turn radius. One, is to have the wheels turn more (front, or back).

But, another way, is to shorten the wheelbase. So, if you aren't able to make the wheels turn more, why not shorten the WB if you can. You won't be sorry, unless you shorten too much and now can't carry anything in the FEL

One could also make the rear wheels turn in the opposite direction and/or articulate the chassis (or just the rear axle) to accomplish essentially the same thing.

Certainly both are much more complicated, especially with 4wd.

Renze · Dec 14, 2007

DRL said:
Wonder how many guys make a good living with "Toy" tractors like Kubota.

I make a living building 5th wheel trailers for dinky toy trucks like the Mercedes Sprinter

have_blue · Dec 16, 2007

Great, great thread GT2!

I daydream a lot while sitting atop my tractor mowing for hours, and think about all kinds of improvements. Most of the improvements would be to build tractors more user serviceable and cheap to repair. Some tractors have parts that are so expensive that if they break, it all but totals out the tractor. Having a frame not only eliminates expensive and delicate castings, but makes the machine a lot more versatile and easy to work on. Looks like your project is going to be as cheap and easy to repair as a tractor could get.

Good luck! Looking forward to more pictures.

Merry Christmas to all!

Tractors4u · Jan 25, 2008

GT2, what is the status of the tractor? People have posted here from time to time about doing this, but no one has ever gotten this far along. Have you made any more progress?

Renze · Jan 25, 2008

have_blue said:
Having a frame not only eliminates expensive and delicate castings, but makes the machine a lot more versatile and easy to work on.

You just described a tractor design as Versatile... that became a brand name for a tractor of that particular design

varmint · Feb 20, 2008

GT2- how about an update, just so we know you are alive and well... You had too much accomplished to just up and quit!

GT2 · Feb 20, 2008

varmint said:
GT2- how about an update, just so we know you are alive and well... You had too much accomplished to just up and quit!

Ha!! No I havent died!

Sorry I'm so slow, I'm working on buying some property in Idaho so I've been saving every dime and working on polishing up my present home to put up for sale in the future.
So... no progress, but the next step is motor mounts and drive line adapters!