The Global Village Construction Set is a platform of is a modular, DIY, low-cost, high-performance platform that enables fabrication of the 50 different Industrial Machines that it takes to build a small, sustainable civilization with modern comforts. It's all open source and for the good cause.
One of the planned machines - LifeTrac is a low-cost, multipurpose open source tractor. What we are looking for is GrabCAD engineers to improve the quick release wheels solution and resolve the failing motor coupler issue. This is going to be a great step forward on LifeTrac’s direction as the world’s first life-size Lego tractor. So your help on this interesting task is very much appreciated.
Current conception of the wheel assembly:
During the testing period, motor coupler appeared to fail and stopped functioning.
The winning design is expected to be a monolitic assembly with motor, bearings, and shaft – that can be taken right off the existing frame – by loosening a bolt and releasing a cam lock.
This simplifies the former mounting method, where 3 mounting plates were attached to individual frame members by using 6 bolts (see the picture).
Also, check out the introductory video of the GVCS project.
To be able to take it off with just 1-2 bolts within 5 minutes.
High-torque, splined shaft motor ghave to be used:
Bolt with cam around bolt, where cam is locked in by a lever and tightening the bolt both fixes the lever and pinches the frame tubing
Cam has a handle running parallel to the shaft when unlocked, and parallel to frame members when locked. Cam handle is welded directly to cam
A second bolt towards middle of assembly pinches the assembly around tubular frame members
A peg (see concept drawing) fixes the assembly in place on the frame. Note that the cam and bolt can be integrated into one, not shown on concept drawing. The second bolt is also not shown in the concept drawing
Cam concept (top view, bolt head not shown)
Complete LifeTrac Frame geometry must be considered as per the downloaded model.
Winning design will be chosen based on the design and functionality
The competition is open to everyone
Team entries are welcome
You can submit several designs
Only models uploaded to GrabCAD library will participate in the competition
Only models uploaded through this challenge page will participate in the competition
Tag your model with “lifetrac” to make it easier to find.
Privately uploaded models will be made public after the competition deadline
Models can be done in any CAD software as long as a STEP or IGES files are also uploaded
Competition starts: 6st of December, 2011
Competition ends: 24th of December, 2011
Competition winner will be announced in GrabCAD’s blog
The entire project is based on open source principle, encouraging people to participate for the good cause.
But there are some nice things we are giving away:
Limited Edition GrabCAD and Global Village Construction Set T-Shirt + Admission to a one-day Natural Building workshop at Factor e Farm in 2011. Includes hands-on experience: brick laying with CEBs and square bale insulation; assisting with lumber production with the Dimensional Sawmill, and square bale making with the Baler. See our Kickstarter campaign for more information on this package.
Most creative design will be chosen by Open Source Technology with a little help from GrabCAD
Open Source Ecology is a network of farmers, engineers, and supporters that has been imagining and creating the Global Village Construction Set, an open source, low-cost, high performance technological platform. These DIY-fabricated industrial machines can be used to build a sustainable civilization with modern comforts. The GVCS lowers the barriers to entry into farming, building, and manufacturing. It is a life-size lego-like set of modular tools that can create entire economies.