[WIP] Farm Tractor - 8281 homage

[syclone]

Good Day. 

8281 is a $10 set released in 2006 which had a simple harvester(?) attachment that could be lifted up using a lever to disconnect it from the driveshaft. Even being so simple it's a neat set nonetheless and it was my first ever Lego set (was 5 y/o). This would be an homage to my grandmother as well, who gifted me this set, making a perfect introduction for me to Technic. 

The goals of this build are:

• PF remote control
• Green color + yellow wheels
• rear PTO
• Some sort of harvester attachment, red-colored
• Front pendular suspension
• Cabin with shock absorbers
• Rear axle with locking differential
• 13x24 front wheels (rear ones on 8281)
• 62.4x20S rear wheels

 

Progress so far:

This is the approximate wheelbase I planeed initially, however, as I won't be using a buwizz, it can be shortened by1-2 studs.

The front axle is pretty much solved, it has even got ackermann geometry (not accurate one though). The pivot point is the steering shaft, and the axle will be held onto the chassi using the 90° connectors on front&rear.

 

 

Rear axle hasn't had the same luck. The current encarnation has a locking diff and is powered by a XL motor. However, the 16z between the 24z crown and diff slips even under the speeded-up motor. Also, the motor is positioned way too high, so most of this will have to be rebuilt. 

EDIT: will use a worm gear

 

As the motor will be moved to the front, a 9v battery will be used to allow space for PTO, suspension & proper cabin. Hopefully this won't be another failure as it is pretty much out of my comfort zone 

 

Edited February 24, 2019 by syclone

[Jurss]

17 hours ago, syclone said:

However, the 16z between the 24z crown and diff slips even under the speeded-up motor.

No surprise, as there is "wrong" gear ratio. It would be really fast tractor with that kind of gear ratio.

 

Edited February 25, 2019 by Jurss
misstyping

[syclone]

LIVESTREAMING:  

 

 

On 2/25/2019 at 9:03 AM, Jurss said:

No surprise, as there is "wrong" gear ratio. It would be really fast tractor with that kind of gear ratio.

 

Initially was expecting to use a BuWizz, so was gearing down the XL motor so as to reduce the stress (dumb idea)

Anyway, using a wormgear now, and streaming the build

[syclone]

Progress:

Steering with micro motor; working steering wheel for the cabin; pto output shaft (still have no idea how the coupling mechanism works irl, so thyt's due to later)

[Mechbuilds]

I can't handle the awesome of this thread. I loved that set too!

[syclone]

Progress:

made some front bodywork, added lights. Figuring out a 3 point hitch

1 hour ago, Mechbuilds said:

I can't handle the awesome of this thread. I loved that set too!

Thank you!