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  1. MMcCawley

    Four Bar Geometry Lift Mechanism design for maximum articulation

    It would still need to be determined. Likely a cylinder with some sort of linkage to provide control over the 210 or so degrees.
  2. MMcCawley

    Four Bar Geometry Lift Mechanism design for maximum articulation

    I'm brainstorming different potential layouts to lift a load from the ground to a platform (see attached). In this particular layout, the mechanism would see more than 180 degrees of articulation and as a result the four-bar linkage becomes unstable when the four pivot axes become coplanar...
  3. MMcCawley

    CO2 / N2 Mixed Gas Behavior Question

    Thanks for your reply BigInch. I agree, I could achieve similar results by running a large amount of straight N2 thus minimizing the change in volume but unfortunately I'm up against a packaging constraint. If anyone else has any creative ideas I'd love to hear them. Thanks again!
  4. MMcCawley

    CO2 / N2 Mixed Gas Behavior Question

    I'm working on an application that utilizes liquified CO2 (at vapor pressure) to act on a hydraulic bladder (similar to an accumulator) with the goal of providing a constant pressure as the volume of oil in the bladder fluctuates. The device operates in a 17-26C environment creating fluctuation...
  5. MMcCawley

    Cellophane / Cellulose forms other than film

    Thank you guys. I've done a little research and still have a ways to go but it looks as though there may be a few barrier coatings which will enable me to achieve my desired results (Ethylene vinyl alcohol- EVOH being one of them). Here is a link to a great paper I've found on Barrier Polymers...
  6. MMcCawley

    Cellophane / Cellulose forms other than film

    Hi Chris, I've got a copy of a similar paper (same name but written by Laurence McKeen) which is what originally lead me down the Cellophane path. And yes, I am referencing Cellophane and not a generic "Plastic Wrap". From a CO2 permeability perspective Cellophane is far superior than any other...
  7. MMcCawley

    Cellophane / Cellulose forms other than film

    Hello, I'm considering using Cellophane in an application to reduce CO2 permeability in a pressurized container. Can anyone tell me if cellophane can be formed into any shapes other than film? I.E. can it be used as a coating, extruded, injection molded, etc? Thanks for your time!
  8. MMcCawley

    Coating and/or Material to minimize CO2 permeation

    Hi, I'm working on a medical design project that will utilize a high pressure gas (likely CO2) stored at the vapor pressure (~850 psi) over a long period of time (2-4 years). My concern is gas permeation of the CO2 over time. The "pressure vessel" will likely be injection molded out of ABS...
  9. MMcCawley

    Volumetric Ratio Calculation

    zdas04- CO2 Liquid Density @ 20degC: .77g/cc Assume 1cc compressed liquid volume to keep things simple Mass=DV=(.77g/cc)(1cc)=.77g Gas Density @ 1atm, 20degC: .0018394g/cc V=M/D=.77g/.0018394g/cc=418.6cc (basically the same as above). So I'm assuming the data on Air Liquide's website is...
  10. MMcCawley

    Volumetric Ratio Calculation

    BigInch- CO2 Liquid Density @ 20degC: .77g/cc CO2 Molecular Weight: 44.01g/mol Assume 1cc compressed liquid volume to keep things simple Mass=DV=(.77g/cc)(1cc)=.77g n=Mass/Molecular Weight=(.77g/44.01g/mol)=.0175mol V=nRT/P=(.0175mol)(82.057cm^3atm/Kmol)(293.15K)/1atm=420.9cm^3 Does this look...
  11. MMcCawley

    Volumetric Ratio Calculation

    Hi, I'm trying to determine the proper equation required to calculate volumetric ratios between compressed, liquified gases and the same gas at atmospheric pressure. For example, let's assume that I have 10cc of liquified CO2 in a pressure vessel at room temperature ( Vapor pressure = 849 psig...
  12. MMcCawley

    Yield and Tensile strength of 6061-T6 Aluminum at 200 degrees F

    I forgot to add- the exposure time to the elevate temperature is less than 30 minutes. I'm not sure if this has an affect compared to longer durations at elevated temperatures. Thanks again.
  13. MMcCawley

    Yield and Tensile strength of 6061-T6 Aluminum at 200 degrees F

    Hi, I'm looking for the tensile and yield strength of 6061-T6 Aluminum at 200 degrees Fahrenheit (150 and 300 as well if possible)? Also, can you reference the source of the data or the chart? Thanks! Matt
  14. MMcCawley

    Titanium motorcycle wheels

    Swall, Correct me if I'm wrong but most grades of titanium should be both both stronger and stiffer than forged 2014-T6 (Sut of about 70ksi and Modulus of Elasticity of about 10.5 ksi)whereas titanium (6-4 for example) has an Sut of 175 ksi and Modulus of Elasticity of about 16 ksi. With that...

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