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What cast iron used for milling head build

  • Lathe

    Votes: 2 28.6%
  • Milling

    Votes: 7 100.0%

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    7

TSutrina

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I have been interested in building my own machines since I saw the Gingery designed home made machines: lathe, Mill, and shaper. There are others all made from aluminium castings and steel ways that are flat bars. Gingery-style homemade metal lathe builds | Make: But casting seem to be a complication that doubled the complexity of building a machine. And I do not see a significant supply of aluminum, a second complication.
Concrete on the other hand, stone and sand are cheap and plentiful. Also reinforcement components out of steel are also cheap and plentiful. Casting patters are also typically wood. How to make concrete less likely to fail, crack is understood and the information is available. For example Tyler Ley has many videos on how to keep concrete from cracking. Post stressing concrete is one of the best and easy to do for small items. You can find a bench made with fiber filled concrete with a few theaded rod in plastic tubes bent into a shallow "U" shape to keep the concrete in tension. Two inch thick and like 4 or 5 foot long strong enough for a two pound person to stand in the center. Here is a reinforcement video from Tyler:
NASA had a contest to 3D print housing which using Mars materials would be the printing of concrete. This is the video made by the second place team:
Note that the stresses are always highest at the surface of the structure so cast iron components of machines are hollow. Concrete machines also should be make hollow. Say a wall thickness of 2 inch and maybe 3 to 4 inch around the active post stressed steel and the cast in place reinforcement steel. To prevent cracks fibers of steel, glass for concrete or besalt would be used. Bamboo has also been used, plant fibers.
 

MrMetric

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I've seen that done. It is interesting. I've also taken apart an unreinforced brick chimney that was in the middle of my house. It was the opposite experience of your parents. I live in earthquake country, and let me tell you. I was stunned at how easily that chimney crumbled once the cap was off. Yes, as a composite structure it was strong, but after the the top was off, a few whacks and the whole wall started crumbling away. I don't miss that chimney at all.

Your parent gave a whole new meaning to, "I like this house... I don't want to leave!" ;)
 

MrMetric

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There are a few 3D printed housing technologies that are being started up. It is pretty nascent, but I personally think that they are really cool. Ditto with ICF (insulated concrete forms). I may do that for a basement sometime if I move. I think that is kind of the cat's meow. Very neat stuff.... You are right, though, concrete is an amazing substance... There are some really nice counters you can make with it. Best of all, it is relatively inexpensive and eminently recyclable.
 

TSutrina

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I fixed the top of a brick chimney also. Snow, ice, and rain destroyed the concrete holding the bricks together. Took it down to the roof and then rebuild it up. There was not reinforcement in the chimney thus any side forces would put the chimney in tension, break the bond to the bricks. The shape of the Mars structures is to use gravity to keep the concrete in compression. All the Roman stone and concrete structures are design to put the concrete in compression since their is no reinforcement. The majority even in the earth quake prone Italy have survived for centuries and surviving earth quakes. The Mars structures are not reinforced. Fibers could easily be added. Basalt was one of the materials mentioned as well as plastic brought to Mars. Basalt fibers and plastic fibers are both used in concrete to keep cracks small and not growing. Then a person could insert short metal reinforcement into the concrete so long as the nozzle doesn't hit it when the next layer is added. The plastic and metal could be taken from scrap material. The parachute and other landing components are scrap.

Reinforcement is easy to do. Here is the DIY possible table design which is the size more typical of a machine out of concrete.
The majority of information is for building and bridges. Civil engineering but it works just as well for smallers structures.
 

WmRMeyers

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Concrete bridge port milling machine has been built as other big commercial machines. Concrete is typically made with epoxy replacing concrete. Machine Casting – Castinite However actual concrete machines were build during WWII to produce production parts. The base line is patent 1154155 by L. I. Yeomans Sept. 1915 Articles on the web can be found.
The Multimachine Open Source Concrete Lathe Project is a standard concrete machine found on the web. Sorry do not know the full site address: ...

SNIP!

The MultiMachine group is on Groups.io, now. multimachine groups.io Group There are files and photos there of the machines Pat and others have built. I'm a member and moderator there. No cost to join, and not much activity at all these days. It would be nice to have some new members!

Bill in OKC
 

ajoeiam

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I fixed the top of a brick chimney also. Snow, ice, and rain destroyed the concrete holding the bricks together. Took it down to the roof and then rebuild it up. There was not reinforcement in the chimney thus any side forces would put the chimney in tension, break the bond to the bricks. The shape of the Mars structures is to use gravity to keep the concrete in compression. All the Roman stone and concrete structures are design to put the concrete in compression since their is no reinforcement. The majority even in the earth quake prone Italy have survived for centuries and surviving earth quakes. The Mars structures are not reinforced. Fibers could easily be added. Basalt was one of the materials mentioned as well as plastic brought to Mars. Basalt fibers and plastic fibers are both used in concrete to keep cracks small and not growing. Then a person could insert short metal reinforcement into the concrete so long as the nozzle doesn't hit it when the next layer is added. The plastic and metal could be taken from scrap material. The parachute and other landing components are scrap.

Reinforcement is easy to do. Here is the DIY possible table design which is the size more typical of a machine out of concrete.
The majority of information is for building and bridges. Civil engineering but it works just as well for smallers structures.
The stuff holding the bricks together is not actually concrete.
The technical term is 'mortar'.
It is similar to concrete but not the same thing.
 

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