Volvo FE Garbage Truck


My favorite vehicles to build are garbage trucks (Ok, maybe trial trucks). I enjoy the many functions that I can create. I enjoy the diversity of shapes, sizes and colors, and I enjoy how ubiquitous they are. But I have not built many. So it was time to fix that.

Volvo FE Refuse

I was originally going to do a large scale truck, but as my temporal limitations are becoming ever more apparent, I decided to do something smaller this time. The 13 stud wide truck is popular in the Technic community, so I decided to go with that. I very much enjoy the Volvo FE, so that was my truck. Since my last truck was one with three axles and Power Functions, this one would have two axles and be manually controlled.

Volvo FE Extraction

I searched high and low for garbage box that would work well: Gesink-Norba, Heil, McNeilius, EZ-Pak, Dennis-Eagle, Ros Roca. All required a compactor that would need a round base for the trash to collect. Curves are hard to do in LEGO. I had some trouble with refuse compaction cycle working well on the Axor due to the floor curve on the hopper. I wanted a compaction cycle that was more simple and more reliable. So I designed my own.

It’s dead simple.

There is a angled elevator in the hopper that goes straight up and down. The center gear on the outside of the hopper that moves the elevator. When refuse is placed on the elevator and lifted, the refuse will fall over an internal wall at the top of the cycle. The refuse falls into the compaction bin, until the rear hopper is opened. Bigger parts sometimes gets stuck on the cross axle.

Volvo FE Hopper

Inside the compaction bin, is an extraction plate. Turn the gear down near the front left wheel, and you drive a mLA to move the internal extraction plate. Everything works well for small LEGO refuse parts. I built the side of the compaction bin with slopes and tiles. After a number of panel attempts, this one seemed to be the best looking option. I very much enjoy the shape.

Volvo FE Compactor

Since I had a little more internal room, I added a driveline to the truck. A rear differential powers a small fake inline 2 cylinder engine under the cab. To check it out, the cab tilts forward. The steering axle serves as a friction connector so the cab does not open unless you intend it to tilt. The doors open, and the bodywork was designed to mirror the Volvo FE 2011 body style. I built a small red refuse bin to show off the functions of the truck.

This may be my favorite build of the year. All the functions work perfectly, and the model looks great. I think I could add a tilting bin function, and add another mLA to give more strength to the extraction plate, but other than that I am not sure I would change anything. I will keep this one built for a while.

Happy building.

 

Mercedes Benz Axor Refuse


I am a big fan of garbage trucks.  For some reason I find the combination of a smaller truck,with many features all with a complicated compaction device is a great basis for a complicated LEGO Technic model.  Plus, trucks are fun.

The hardest part was going to be the rear compaction device, so that is where I started.  I decided to use a Geesink Norba design as it would give me the largest opening for the trash in the rear because the mechanicals would be on the bottom on and the top of the opening.  13 studs wide is not much space.  In addition, this would allow me to have the rear hopper pivot up to let the trash out when it was full.  I would need to have three functions going though the pivoting hopper.  One at the pivot, and two connecting at the base when the hopper was closed.

The dumpster lift would be driven through a knob gear when the hopper was closed on the bottom.  The compation device would be operated with a gear on the bottom and a mini linear actuator on the top.  This mini linear actuator would also function as the opener for the rear compactor.  All the motors would be housed on the bottom, with one motor placed next to thebattery box.  The extractor would be operated by another mini linear actuator using a scissors mechanism to move the ejector plate.

The chassis was constructed with a PF XL in front of the steering axle.  The motor would power both the drive, and the extractor changed by a changeover.  The steering motor is placed on the right of the truck.  On the left, another PF M motor powers both the dumpster lift and the lower hopper compaction device.  All power came from a 8878 rechargeable battery box, through two PF IR receivers, and powered four motors: One XL for drive and the extraction plate, one M for steering, one M for the dumpster lift and lower compaction, and one M for upper extraction and hopper opening.

The model worked well, particularly steering and the drive.  However the extraction and the hopper opening was a little less reliable.  The hopper was too heavy for a single mini linear actuator, and the compaction device was not stiff enough.  It happened to get caught on some of the internal edges on the inside of the hopper.  The next garbage truck will need to be built a little more sturdy.

The full gallery may be seen here.