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  1. CastMetal

    Quench rates & methods 6061 Aluminum Tube

    If all you are looking for is tensile strength 6061-T6 can match 5052. In general for quenching aluminum, a quicker quench yields higher strength. This is generally done with room temperature water. Then followed by an aging heat treatment. The time the material spends below solution temperature...
  2. CastMetal

    MAP for hot food?

    One of the major concerns not addressed yet is humidity and condensation. Sufficient ventilation will negatively effect your heat retention. This is something that is of concern to another home cooked meal replacement..... Pizza. While the pizza box we know and love is a poor food transportation...
  3. CastMetal

    Good mobile apps for engineers?

    I started using Mech. Eng. Toolbox. Good range of basic formulas/ conversions/ calculators/ materials. A lot of the apps listed above rolled into one. Worth checking out. Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what...
  4. CastMetal

    EDM of NiHard prts

    Any EDM operation will have a HAZ. The lower the Amp/area the thinner the heat affected zone. You may be able to find someone to burn low and slow but it may be difficult to find any information on just how large a HAZ your material can tolerate before you start to be concerned with micro...
  5. CastMetal

    Gripper Solidworks

    http://grabcad.com/ Is a good place to find generic CAD models Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations
  6. CastMetal

    How deep can you cnc

    If this is from billet the corners can be drilled out then the pocket would be milled. In my opinion it is machinable, but not ideal or easy to achieve a good finish. It will depend somewhat on your machinist producing the part, when in doubt I would defer to their recommendations...
  7. CastMetal

    Air pressure needed at compressor outlet

    Most small compressors would have difficulty maintaining a pressure of +/- .01 BAR, +/- .15 psi and would be set at a slightly higher pressure say 5.5 bar and brought to the desired pressure with a regulator at the point of use. This also will account for other line losses...
  8. CastMetal

    bronze 3d printing

    The technology is available, I have seen it called DMLS "Direct Metal Laser Sintering." Production times will likely make this unrealistic, also surface finish of the printed part is similar to a permanent mold casting or sandcast part which is likely much rougher than you require. Here are a...
  9. CastMetal

    Robot CAD Download

    I would give http://grabcad.com/ a try. Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations
  10. CastMetal

    Welding AL 6061-T6 to B390 Die Casting Alloy

    Not to hijack the thread but, Cory have you had experience with vacuum die-casting making a substantial difference in the quality of welds? Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world...
  11. CastMetal

    Machining center with onboard CMM

    Get what you pay for will always be true, but for 10 micron even the "budget" brands with the right options would be acceptable. Certain Haas machines come with a finer pitch ball screw that is listed as accurate to .0002" / 5 micron. For more complicated measuring routines like BrianE suggested...
  12. CastMetal

    (can of worms alert) Globe hasn't warmed in the last 16 years

    rconnor, While humanities exponential growth following the industrial revolution has made the limitations of our resources apparent, this growth trend has fallen off. Most of the industrialized worlds fertility rates are below rate of replacement and data released last year from the UN suggest...
  13. CastMetal

    Help - genius needed!

    I would look at www.matweb.com , very helpful site for cross referencing material grades. ASTM 1040 would be equivalent to EN8. Highly recommend planning on testing material sourced from china regularly. The first batch may be in spec but quality fade is an issue. Just had an aluminum alloy...
  14. CastMetal

    Brain Teasers

    Sompting- Back to the displacement question, I see the smug interviewers statements as correct. If you have a bucket of water in a boat and pour it into the pond the water level is the same, the volume of boat rising above water level is the same amount as water added. If it is a brick the water...
  15. CastMetal

    AL 7050-T7451

    T7451 Treatment for AL7050 is 24hrs+ at 320°F. This step in the process is to artificially age the Aluminum. A longer time or cycling in this temperature range would have little effect on material properties. I do not have specific experience heat treating 7050 but would believe this to be the...
  16. CastMetal

    Let's burn more sunshine

    Regarding nuclear fission, the number 1 major accident / 10,000 years of operation seems to be thrown around quite a bit in pro-nuclear literature. Sounds like a reasonable number, with our 500 some odd nuclear reactors in operation worldwide that would be once every 20 years. If nuclear...
  17. CastMetal

    Struggling to get my footing in Mechanical Engineering

    I made the same mistake of not going after summer internships in mechanical engineering and also spent close to a year looking for engineering work after graduation. Networking eventually landed me a position. Keep in contact with friends from college, reach out to family friends, acquaintances...
  18. CastMetal

    Engineering as a commodity: Can we reverse the trend?

    I like to think the behavior of new graduates is a poor indicator of the engineer they will become after some years of experience. I may not have had the "holier than thou" mentality entering the workforce but I still suffered many of the afflictions commonly seen on this site. Reluctance to use...
  19. CastMetal

    Optimal Linear Actuation for Friction and Wear Measurement

    ASTM standards would be a good place to look. http://www.astm.org/Standards/G115.htm , bring your wallet. Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations
  20. CastMetal

    Molten Aluminum resistant metals

    The biggest issue with the spray or paint on coatings commonly used for low pressure (permanent mold) operations is they wear off too easily in a diecasting runner, if that is what you are referring to, you didn't specify. Biggest factors you may be able to control outside of the coating- metal...

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