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  1. BikeDaily

    Compressive Strength of Steel

    I have heard of crippling. When I use thin sections I use Bruhn's "Analysis and Design of Flight Vehicle Structures" to check for the crippling stress. But the member in question is a W21x62 beam. Pretty small for a 21" I-Beam. But I don't believe crippling is a concern here. The length at this...
  2. BikeDaily

    Compressive Strength of Steel

    Greetings, I am looking at a cantilevered rack system. So a pretty straight forward set of calculations. Or so I thought. For the rear vertical member (backbone as I call it) I have come up with a stress due to bending of 12,001 psi and a stress due to compression (from the weight of load and...
  3. BikeDaily

    Keyed Hub Design

    Mike, I have used this approach in the past. But often I have large diameter shafts >8" and high torque 500,000 in-lb and greater. And often I need to fit this in a small area. So using higher strength materials is often necessary. Is there a "correction factor" for a keyway in a tube when...
  4. BikeDaily

    Keyed Hub Design

    Greetings, I am designing a hub that will go over a gearbox output shaft. The key comes on the gearbox output shaft standard, so in this case I don't have to select cross section and length. Although I know the general guidelines for shaft diameter/key size. But what I am having an issue with...
  5. BikeDaily

    Scissor Lift Analysis

    This was designed many years/decades ago, not engineered. So calculations don't exist. I'm sure the design process consisted of a few blokes flipping a coin on if the scissors are strong enough. Now the customer wants to increase their load carrying capability and I have to decide if it is...
  6. BikeDaily

    Scissor Lift Analysis

    One end of the cylinder is fixed because of the purchased cylinder and the size of the cylinder. The cylinder is fixed, not on the cap end, but on the "head" side of the cylinder. The actual cylinder is 60 in long and hangs below the table in a pit about 30 in. It is far easier to attach to the...
  7. BikeDaily

    Scissor Lift Analysis

    I understand there is no mechanical advantage when using the cylinder. (Which is quite often the reason for using a cylinder) The scissors are just to keep the table level while moving up and down through the stroke of the table. The scissors are especially important because the cylinder cannot...
  8. BikeDaily

    Scissor Lift Analysis

    Greetings, I am analyzing a "stack table" with a scissor lifting mechanism. I am having difficulties when trying to analyze the structure with the hydraulic cylinder. The cylinder is fixed on the bottom and is pinned on the top. I have seen many examples in text books of scissor lifts and...
  9. BikeDaily

    File Load Failure

    Thank you very much. I knew there had to be a more efficient method of re-linking the files. It works great! Thanks for the help.
  10. BikeDaily

    File Load Failure

    Greetings, I have created an assembly and saved it a number of times. My assembly reaches into many different folders to pick out some of my company's "stock parts". One of those folders recently changed name, from "42" to "42 (Bearings)". Now when I open an assembly using parts in that folder...

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