Lunar Regolith sounds a lotlike moon dust, which should be available in adequate quantities on the moon, it seems.
What are the mechanical properties of the parts fabricated thus far, and are they actually useable? I know that the first 3D printed parts were primarily useful for visualizing and not much else. But tha was in 1988.
Producing parts from the materials listed does not seem like they would be very tough, but rather very hard and quite brittle, unless some additional work was done on the mixture prior to laser sintering. I see a real challenge in providing a uniform particle size and uniform chemical composition.
Providing enough power to run the 3D printer is the other challenge that could be an obstacle to using the process onthe moon, although with an adequate solar array enough power should be available.
If more information is available a discussion of the properties of the material will be an interesting presentation indeed.
I have to agree. I never thought of all of the things you would have to do without while being up there. It's not like you can just go down the street and pick up a screw at the local hardware store.
ChasChas, minerals are not to be dismissed--and they are also found on the moon. If a widescale disaster happened here on Earth, as in sci-fi novels and movies, and all cultures got sent back to the stone age, it would be really difficult to re-create current conditions primarily because we've used up most of the Earth's minerals that were available via mining, to forge metals. Those metals are what we used to build machines, including the ones that then built other materials. The history of industrial technology is an interesting and instructive study.
I'd like to point out that the materials upon which our technology is based aren't consumed and made to be unusable once they have been incorporated into our machines and infrastructure. That is to say, we have not "used up" the iron, aluminum and other raw materials and they will be more accessible to future post dark age humanity that they were to our ancestors. They will just be in other places and not in their native ores. They will be in land fills, salvage yards and in the infrastructure concentrated in urban areas. In fact, many of them will be in a form much more recognizable as useful to people in a dystopian future than they were the first time we dug them out of the ground. Granted, fossil fuels will be much harder to find but that should be the only resource disadvantage to future peoples trying to build a technological society from scratch.
This reminds me of the folks who think money spent on space exploration disappears into the vacuum of the void with the few insignificant pounds of materials that we actually send into space. That money feeds into the economy and allows many people to feed their families, pay their mortgages, etc. and is in no way a waste or lost forever.
emneumann, thanks for the comments, and glad you liked the article. Unfortunately, we *have* used up many, perhaps even most, sources of raw native ores. Scrap and reclaimed metals are by no means easily reusable at the same strengths as when originally forged. Aluminum makers claim theirs is, but as usual, that depends on several variables. The dystopic scenarios are not confined to science fiction.
William, both materials and processes are still in development, as we mentioned in the article. I think a bigger challenge than materials development will be the point you mention about power sources.
Ann, did you get a sense of what types of components will have the first priority for fabrication on the moon? I would imagine that the limited material available will also limit the variety of parts that can be fabricated.
If you mine the regolith on the moon's surface, there are actually quite a bit of materials that can be processed. Different locations on the moon will result in different percentages in composition. My employer, Teledyne Brown Engineering (TBE), has worked with Marshall Space Flight Center (MSFC) on In Situ Fabrication and Repair (ISFR) where we looked at using lunar regolith as a feedstock for additive manufacturing as well as other complementary projects. We specifically looked at the EBM process. With the EBM using a vacuum in their build chamber, the lunar environment is an excellent one. We have looked at mining oxygen from the lunar surface and using the waste products from this process (metal oxides), converting it to powder, and using it as the feedstock. It is certainly possible. There is titanium and other metals available on the moon.
We have looked at mining this material, as well as combining all metal "waste", and also looking at the lunar regolith. We did this work 4-5 years ago using a couple different simulants. We made some brick samples using lunar simulant along with a binder. The funding stopped and we could not continue this work. The funds were re-directed to more short-term work such as building a new rocket to replace the shuttle fleet! Other areas of interest included non-destructive inspection of additive manufactured parts such as Microwave and millimeter wave nondestructive testing and evaluation methods. We looked at post-processing these AM parts to arrive at acceptable tolerances. We even looked at growing biological parts as well as producing electrical components such as PC Boards and discreet components.
I'm glad to see additional work being done in this area. We spent 4-5 years working on everything from a lunar base to documenting possible existing parts on the ISS that could be replicated using additive manufacturing in space. NASA is very interested in looking at in situ manufacturing and this work will help make it happen. We worked with the Contour Crafter in building habitats and building launch/landing sites.
This was some really fun work. Hopefully, we can get the project going again and help make some significant progress!
Greg, to answer your other question concerning what components will be fabricated first, you have to decide what spares make sense to bring with you. In some cases, the upmass makes sense to bring the spares. I think the first things to fabrciate may be simple tools or unique tools made for specific applications. Additionally, the exercise equipment is always in need of repair on the ISS so I could see some repair parts for the crew health equipment.
Greg, most of what I've read mentions simple tools and replacement parts would be the prime candidates. But then there's also the idea of making structures, like Contour Crafting has proposed http://www.designnews.com/author.asp?section_id=1392&doc_id=250614 JimG, thanks for weighing in with your direct experience. I think this is a very promising and exciting area to be working in.
Jim, thanks for your insider information on the subject. Here's hoping we have a good reason to go back to the moon to take advantage of this and other developments.
Didn't know that printing on the Moon or Mars would require working in a "zero gravity" environment. Low gravity, as compared to earth maybe, but not zero gravity. If you are going to be making stuff to be used on the surface it would make no sense to transport it to space and then back to the surface as that would have a heavy cost in fuel that would be in short supply.
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