JCB 531


Astute readers will note the heading of Thirdwigg.com has changed to read “LEGO Technic from Grand Rapids.” A slight heading change notes a rather large life change for myself, Mrs. Thirdwigg, and Jr. Thirdwigg. This has caused a slight hiccup to production and the timeline of The Queue, but we are back in business.

A working telehandler has been on my list of machines to build for a long time. I finally acquired a 32l axle, and it was the impetus I needed to start the project.

The full gallery is here.

Ready to take on any project.

Ready to take on any project.

Right from the beginning I decided the MOC would have steering, boom lift, boom tilt, and boom extension. All the functions would be manual as is my current trent (do not fear, it will be over soon), and would be housed within the boom itself. I based the scale for the MOC on the length of the boom being 32 studs so I could use the full 32l axle.

The 32l axle was placed on the top of the boom, and would allow the sliding 8z gear to transmit rotation to the fork tilt throughout the full extension of the boom. At the end of the boom I added a mLA to adjust the tilt of the fork. It took a little working, but I eventually figured out how to adjust the tilt for every position in the lift. I then worked on the boom and the extension so it would be as stiff as possible through all points of the lift.

I then worked on the chassis and the cab. The chassis was rather basic, and after a couple of rebuilds to get the steering right, it was done. I did have to do some revisions to have the boom/chassis interface more rigid. It turns out that when the boom was fully extended, the lift would sway a little too much. I then added a cab and the engine box on the right side. Here you can see the final project working.

The MOC worked well, and other than a slight sagging of the boom at full extension, I would not change a thing.

Happy Building.

JCB 930 Forklift


It was time for me to to make something that was a little smaller with a lot of functions.  I kept driving by a JCB forklift on the way to work, and I thought I could make that.  I wanted manual functions, including a working fork tilt and dual stage lift, working steering and drive, and a yellow bodywork.

I always start with the hardest part of a model.  For this model, that was the fork.  I wanted to use a dual stage lift as to get the forks to a substantial height.  This design would require a chain that would wrap over a moving frame, and connect on one side to the forks, and on the other side to the body.  The moving frame would be moved by a screw, thereby lifting the forks.  I used a number of worm gears on two 12l axles, connected through the bottom to move the moving frame.  This setup allowed for a pivot point, and a lifting mecanism that would function much like the real JCB 930.  The moving frame consisted of two rows of liftarms, and the forks tied everything together between the moving frame and the worm gears.  A chain went up and over the full assembly to work move the forks as the moving frame was lifted.  It works like this.

I then worked on the driveline.  I added a 3 cylinder motor in the rear, driven by the front wheels, working to keep the functions out of the way of the fork mechanism.  I added a steering axle on the rear, and gave it a pendular suspension setup.  This allowed for some stability on uneven ground, while keeping the front wheels planted for the load as it had no suspension.

I then built the body after the JCB 930, and as I did, I added a tilt freature to the fork.  This feature did not work too well, but it gave me the ability to adjust the pitch of the forks, which we a design requirement.  It was not too stable.  After a little work to the body, and a HOG steering link out the top of the cab, the model was done.

The model worked well, particularly the lift feature.  I was a little disappointed with the tilt feature, as it was a little too wobbly. The drivetrain worked well, and the steering allowed for tight corners.  The suspension give good stability, and offered a little bit of off-road prowess.

The full gallery is here.

Follow

Get every new post delivered to your Inbox.