LifeTrac Continued

Fri 5 Sep 2008

Posted by Marcin

Here is the evolution of LifeTrac (see wiki work page) from design, possibly the most simple implementation of tractor-loader functions:

to steel frame:

to wheels and motor,

and to bucket:

I completed the quick attach plate yesterday, from design:

to fabrication:

The plate mounts on the front end loader arms, instead of the bucket, and is based on similar designs used for this purpose. The quick attach plate is used to attach any implement on the front end loader. The triangular quick-attach fingers grab the implement of interest from below, and the implement is then fixed to the plate using the two horizontal pins in the picture. This way, we can switch between the loader bucket and rototiller (or any other implement) in under a minute – which will come in handy with soil preparation and loading in CEB construction. Today, I’ll be designing and fabricating the rototiller. I hope to be done by tomorrow. This is just the beginning of the entire LifeTrac infrastructure.

Categories: LifeTrac

[11] Comments

11 Responses to “ LifeTrac Continued ”

Comments:

Lucas says:
September 6th, 2008 at 7:26 am
Yesterday, today, tomorrow. Can’t get any faster than this. Wow and thanks.
Abe says:
September 6th, 2008 at 1:57 pm
What is your cost for the prototype LifeTrac? I am very interested in this design, as we are in a similar situation as Factor eFarm. We are in rural Mexico, homesteading 10 acres of hilly terrain. We need some water storage, and a tractor, specifically a digger is going to be a big advantage. We dug our house site by hand, 4 ft deep, 50 ft long, as the house is partially buried into the hillside. YIKES! It was a chore, and some sort of machine would be nice.

But, as always, price is definitely a factor. I can get a small digger for about $2500, but without a PTO, so that’s about all it can do. the LifeTrac seems to be a viable option, if the fab costs are low. I can get anything from Surplus Center, but lots of the parts I will be available to find locally.

Anyway, a rough price tag would be helpful.

Abe- our cost was $5k for what you see in Factor e Live 8. Maintenance costs are $100-200/year- as opposed to $1-2k for a machine of that capacity. I do not recommend a cheap option like a $2500 digger – the thing will bury you with maintenance costs. That’s exactly what we did – I got a backhoe for $1500 – but it had its share of problems, and I have no control over whether it breaks down tomorrow. So we’re stripping the backhoe off and converting it to a quick attach implement on the loader of LifeTrac. That’s our story.

The good news on price is in the following post that I submitted at Globalvillages Yahoo group. Help us make it happen, sooner rather than later:
—-
From post to Globalvillages regarding applicability of LifeTrac to Africa:

Here is one scenario that we have in mind for OSE-USA. At Factor e
Farm, our near-term (within 2 years) goal is to produce the following
infrastructure for building LifeTrac, the open source tractor
(http://openfarmtech.org/weblog/?p=311) on the cheap.

Note that presently, the basic LifeTrac implementation with loader is
$5k for parts. Note that a machine of similar capacity would sell for
about 4 times more than this on the commodity market. Now here is a
radical proposition: we are aiming to produce the same for the price
of scrap steel and iron that goes into making the machine. That is
about 10 cents a pound, or $300 for the present 3000 lb tractor. Well,
we won’t be able to do it this cheap, as you still need tires and
bearings, and hydraulic hoses, which we would initially outsource.

I propose that it is within the realm of appropriate technology,
fueled by open source design, to produce a tractor as such in a
community supported manufacturing scenario. This applies in the West
and in the developing world.

Start with scrap steel. Melt it down with small-scale foundry
processes, and cast metal tubing, shaft, bar, and sheet. Do likewise
for steam engine castings for the engine. Do likewise for hydraulic
pump and motors. All these are basic technologies – if one has design
blueprints. Use a Babington burner (blog) for the fire. Multimachine
(blog) is necessary for drilling holes and machining operations. Not
even an acetylene torch nor welder is necessary in this scenario.
Castings may be programmed and printed by RepRap (blog).

This is like science fiction – but in reality is not much more than
using proven technology. Reduce that technology in scale to the
village level – and you have appropriate technology.

So one particular aspect – if tractors are in demand – is to produce
such tractors in small shops, starting with fire and scrap steel.
Doable – in Africa and America – though I’m nut sure what your scrap
steel supply is like.

In any case, we aim to have a tractor as such developed here in 2
years – scrap steel, steam engine power, Babington fire, cast
hydraulic motors and cylinders and cast hydraulic pump. Run that on
bio-oil from distilled wood, and bio-oil instead of synthetic
hydraulic fluid – and you have a largely local resource-based tractor.

I propose this as one avenue of weaving a story for possible local
economic development.

Thanks!
Abe says:
September 7th, 2008 at 4:06 pm
Yeah, I agree with you, starting from the ground up is the way to go, however for a one-off type of machine, it wouldn’t be worth it. I could see a market in our area for cheap tractors, but very few people have $3K to spend on a machine. They have horses, which are far less maintenance, and actually reproduce themselves!

But, a horse is not great for digging. Also, it doesn’t have a PTO for other applications, like a chipper.

I could see us making similar, watered-down version of the LifeTrac. First off, we don’t need the power you need, so we can use smaller components. Secondly, cheap scrap metal is actually VERY available to us, and I think we could even find an exiting frame to start working on.

Our main needs would be digging, road maintenance, and a chipper would be nice. So, something more in the 20 HP range would be feasible. The point here is, design for your needs. Smaller is ok for our needs, and will be less cost overall as well.

Wood gas would be a good way to power one of these units. You could build a simple chiper to process the fuel, and then use it to power the tractor. It would be a simple start to growing and self-processing your fuel needs.

Good work on the prototype, and I would love to participate any way that I can. Right now, I think our contribution might be to build a smaller prototype that fits our needs, and try and find most of the materials locally, here in rural Mexico. Some thing would need to be new, like the engine, but the frame and most of the metal, could be salvaged easily.
Marcin says:
September 7th, 2008 at 8:09 pm
You can see the hydraulics design and other details at

http://openfarmtech.org/index.php?title=LifeTrac

Rototiller, auger, stump grinder, chipper, swing-blade sawmill, and well rig coming right up…
Vaughn says:
October 1st, 2008 at 10:06 am
When I saw your rototiller attachment it made me wonder if anyone at Factor E has had the opportunity to read about the keyline concept. Seems like making one of the keyline plows would be even easier than the rototiller.

True sustainability, eh? Here is one link…

http://www.soilandhealth.org/01aglibrary/010125yeomans/010125toc.html

Here is an updated book by a second (third?) generation user of keyline principles

http://www.keyline.com.au/
NLP Zine says:
July 20th, 2009 at 2:50 pm
Interesting blog post. What would you say was the most important NLP factor?

Trackbacks & Pingbacks:

Pingback from Factor E Farm Weblog » Blog Archive » CEB Field Testing - Factor e Live - Episode 10
October 16th, 2008 at 11:22 am
[...] compacted clay – the prime soil for CEB construction. So we are doing further improvements on LifeTrac. The first step is adding a smaller loader bucket – with a tooth bar for ripping into the soil. [...]
Pingback from P2P Foundation » Blog Archive » Community Supported Manufacturing - Careers in Global Village Engineering
October 20th, 2008 at 9:30 am
[...] and production facilities – with the CEB Press powered by a high-performance, open source tractor, LifeTrac – which we also designed, built, and are testing it in the field. This tractor is also used in site [...]
Pingback from Factor E Farm Weblog » Blog Archive » October Progress Report: Major Success in Crowd Funding
November 2nd, 2008 at 9:42 pm
[...] off-grid operation. The month of October was taken up primarily by field testing of the open source LifeTrac/CEB/rototiller/toothbar bucket/backhoe combination – as applied to site and earth preparation for [...]
Pingback from LifeTrac II – Frame | Open Source Ecology
May 15th, 2010 at 3:43 pm
[...] where we can model the heights and angles required prior to building. You can see our initial designs from over a year ago for reference – on the evolution of the project. Addendum: Our experience has shown that it [...]
Pingback from Getting Ready To Build: A Better Future | Open Source Ecology
July 24th, 2010 at 2:05 am
[...] the LifeTrac II budget involves completion of quick-attach plates, fabrication of steel wheel tracks for added traction, and outsourcing wheel coupler lathing, since [...]

Open Source Ecology