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  • Users: becma27
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  1. becma27

    Invar plating?

    Hi all, I'm looking to plate a piece of Invar 36 with a low reflectivity black surface similar to a black anodize for aluminum. Also needs to be a low-outgassing apporoach. Any suggestions and/or specifications to call out? Thx.
  2. becma27

    Calculating # of tie downs needed

    Hi all, I'm fastening a pallet with about 8000 lbs of equipment on it to the inside of a standard ISO shipping container. I plan on using the t slot flooring that is in place in the container to fasten to using some custom t bolts I am making up. My question is how do I calculate the # of tie...
  3. becma27

    Extreme range for motors

    I am looking at spinnning some very lightweight stuff in a large range from say 1 rpm to 500 rpm. I want a DC motor but I know that I won't be able to get below a certain point if I get a 5000 rpm motor. I am thinking of using a gearbox to get down that low, but am looking for suggestions on...
  4. becma27

    determining needed screw pressure for compression plate

    I have a aluminum plate that is 2mm thick, diam 1.5 inches. I am screwing it down with four 2-56 screws into another aluminum plate underneath. Between the two plates is a polystyrene plate, same diameter, 1mm thick. this compresses against several small lenses to keep them in place. I want...
  5. becma27

    Engineering catalogs and reference materials

    Hello all, I just graduated and started my first engineering job as a mechanical engineer for a defense company. I of course have all my old textbooks, plus Marks Handbook and Machinist's handbook. My question is, where do I go or how to I find such things as screw quick reference cards...
  6. becma27

    CAD Dimensioning Standards, examples

    Hello all, I am looking for some information and examples on dimensioning drawings of parts made on Solidworks. I would like something on the web and I am looking for industry standards, not solidworks standards. Does anyone have any good reference sites or recommendations? Thanks, becma27
  7. becma27

    Calculating Inertia of object

    I am trying to figure out the inertia of an object that will be turned by a motor. I want to keep the ratio of inertias below 10:1 and am given that the motor inertia has units of oz-in^2. What kind of inertia is this and how do I calculate it for my object? I have never seen this combo of...
  8. becma27

    sizing for motor

    Hi, I am trying to choose a motor for a project and need some help choosing the corect one. I am given that a 3x3 foot table is to be rotated about an axis with the table weighing 200 lbs. The speeds are very, very slow and I am looking for a resolution of about 100urad (using an encoder)...
  9. becma27

    Angular Actuators for Shaker Table

    I have a three axis shaker table being used for some simulations and currently the x and y axises are controlled with linear voice coil actuators on opposite edges of the 3 foot square table in a push-pull configuration. This works well until about plus minus 2 degrees is reached and then the...
  10. becma27

    Easy natural frequency calc

    Hi, I have a table that weighs around 600 lbs. How do I find it's natural frequency? Thanks
  11. becma27

    thermal insulation calculations

    Hi, I am trying to figure out what to use to insulate a telescope. the operating conditions are between 40 and 100 Farenheit. The telescope is built of approximately half an inch thick Carbon fiber material. I want to make the time constant as long as possible so when I take the telescope...
  12. becma27

    thermal insulation calculation

    Hi, I am trying to figure out what to use to insulate a telescope. the operating conditions are between 40 and 100 Farenheit. The telescope is built of approximately half an inch thick Carbon fiber material. I want to make the time constant as long as possible so when I take the telescope...
  13. becma27

    A column buckling problem?

    | | |---| thirty | | pounds | | fixed with threads all around of weight |---| | | I have included a picture of my problem. Someone told me they thought it was a column buckling pproblem but I'm not sure. the vertical plate on the left will have somewhere...
  14. becma27

    RETRACTABLE WHEELS FOR PORTABLE OPTICS TABLE

    I am builing a support structure for an optics table and am looking for some wheels that you can crank down when you want to move the whole structure. I'm thinking of something like what is used on trailers and campers that is screwed down to the ground to lift the trailer off the hitch on a...
  15. becma27

    Converting SolidWorks to ProEngineer!!!

    I need to be able to convert from solidworks models to ProEngineer models and am looking for the best way to do this. What type of things do not convert well or are lost all together and are there certain approaches for designing the part to take into consideration that make the conversion...

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