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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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What is the best aluminum for heat sink?
On May 7, 9:08 am, Tim Williams wrote:
On May 6, 3:29 pm, James Arthur wrote: Not that I need such precision. I've got the CNC bug[1], and I'm thinking of ways to make things nice. Ways to make nice ways, if you will. [1] A CNC mill and a lathe, and the desire to make more of the same. The lathe and mill are both Turing-complete machine tools, so that's no problem. :-) Crossposting to RCM, which I recall had someone madly interested in something like "Godel's Theorem for Machinists"! Tim Well, if their true Turing machines, let them decide what material they want to use.......isnt that the whole point of the Turing Test?....... |
#2
Posted to rec.crafts.metalworking
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What is the best aluminum for heat sink?
On Wed, 06 May 2009 17:01:06 -0700, VK3BFA wrote:
On May 7, 9:08 am, Tim Williams wrote: On May 6, 3:29 pm, James Arthur wrote: Not that I need such precision. I've got the CNC bug[1], and I'm thinking of ways to make things nice. Ways to make nice ways, if you will. [1] A CNC mill and a lathe, and the desire to make more of the same. The lathe and mill are both Turing-complete machine tools, so that's no problem. :-) Crossposting to RCM, which I recall had someone madly interested in something like "Godel's Theorem for Machinists"! Tim Well, if their true Turing machines, let them decide what material they want to use.......isnt that the whole point of the Turing Test?....... Different thing. Turing showed that after a certain level of completeness, any machine could simulate any other machine (barring such minor difficulties as execution time and storage space -- he was a mathematician). So a computer (or computing language) that is Turing complete can emulate any other computer (or translate into any other language). A "Turing complete" machine tool would presumably be one that can do all the operations of any other machine. -- http://www.wescottdesign.com |
#3
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What is the best aluminum for heat sink?
On Wed, 06 May 2009 20:52:51 -0500, Tim Wescott wrote:
On Wed, 06 May 2009 17:01:06 -0700, VK3BFA wrote: On May 7, 9:08 am, Tim Williams ... wrote: On May 6, 3:29 pm, James Arthur ... wrote: Not that I need such precision. I've got the CNC bug[1], and I'm thinking of ways to make things nice. Ways to make nice ways, if you will. [1] A CNC mill and a lathe, and the desire to make more of the same. The lathe and mill are both Turing-complete machine tools, so that's no problem. :-) Crossposting to RCM, which I recall had someone madly interested in something like "Godel's Theorem for Machinists"! Perhaps this is a reference to Doug Goncz's Replikon Research attempts at self-reproducing machines; but that has nothing to do with Godel or Turing either, and instead is more like von Neumann's self-reproducing automata or Quine's self-replicating programs. Well, if their true Turing machines, let them decide what material they want to use.......isnt that the whole point of the Turing Test?....... Different thing. Turing showed that after a certain level of completeness, any machine could simulate any other machine [...] So a computer (or computing language) that is Turing complete can emulate any other computer (or translate into any other language). Turing made a *conjecture* about universality, but did not prove or show it, and nobody else has proved or shown it either. Equivalence of computation via certain recursions, λ-calculus, and Turing machines has been shown, as noted at first link below. A "Turing complete" machine tool would presumably be one that can do all the operations of any other machine. Sounds right. Following links have details re these topics. http://en.wikipedia.org/wiki/Church-Turing_thesis http://en.wikipedia.org/wiki/Turing_test http://en.wikipedia.org/wiki/Von_Neumann_universal_constructor http://en.wikipedia.org/wiki/Quine_(computing) http://en.wikipedia.org/wiki/Universal_Turing_machine -- jiw |
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