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Type: Posts; User: Kelly Bramble

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  1. Machinery's, Roark's Stress and Strain, etc.

    Ok, throughout my career I have used Machinery's Handbook for design and Roark's Stress and Strain Formulas for my engineering analysis.

    These two books are well know in mechanical design and...
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    Mathcad prime is about $630 per year as a...

    Mathcad prime is about $630 per year as a subscription. They store/keep your calculation sheets. There is a stripped down version called "worksheet library" which has limited capabilities and costs...
  3. No, each layer "floats" because the features are...

    No, each layer "floats" because the features are clearance holes / features. Just like with two floating parts assembled by a through fastener the four features may require full assembly with all...
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    Unless there is a geometric tolerance to the...

    Unless there is a geometric tolerance to the feature defined by that center line the Basic dimension is not needed. However, a limit dimension is required since all features should be specified one...
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    Start with torque and RPM requirements which will...

    Start with torque and RPM requirements which will define gearbox requirements then size motor appropriately.
  6. See the following webages, bottom gives...

    See the following webages, bottom gives references:



    Surface Finish Roughness Metrology Tutorial
    Surface Roughness Conversion Chart Tables
    Surface Roughness (Finish) Review and Equations
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    A "winch" or a "Windlass"? You'll want quality...

    A "winch" or a "Windlass"? You'll want quality Stainless Steel bolts fresh or salt water. Determine what the "winch" installation specification are and do that..

    You can do the 2D statics loading...
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    Weight per volume is the only sure way less...

    Weight per volume is the only sure way less material trace-ability.
  9. Typically, there would be a GD&T specification...

    Typically, there would be a GD&T specification with the surface perpendicular to the threaded hole as a datum and then the threaded hole would be called out:

    | Perpendicular | (diameter) Some...
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    Function first, it needs to work - then consider...

    Function first, it needs to work - then consider manufacture-ability.

    There is not a requirement that "AVG" diameter must include a "Free State" specification - it's just an example.

    ASME...
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    By default and regardless of the dimensioning and...

    By default and regardless of the dimensioning and tolerancing standard specified on the engineering drawing - All dimensional measurements shall be made with the part in a free state condition unless...
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    Seriously, we're not going to train via this...

    Seriously, we're not going to train via this forum.. I'll do short answers but not comprehensive training..

    Wish you the best.
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    Positional tolerances (and composite) with the...

    Positional tolerances (and composite) with the apparent datums specified would require the distance dimensions be Basic or as Theoectical Exact Dimension (TED) if the standard incorporated is ISO.
    ...
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    Yes ~ it is assuming that reflects functional...

    Yes ~ it is assuming that reflects functional requirements and the datums are specified on the right features - which it isn't.
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    On the engineering drawing ... are the distance...

    On the engineering drawing ... are the distance dimensions expressed as +/- tolerances?

    and, no your tolerance analysis is not close and you do not appear to have a basic understanding of the...
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    Find the bearing specifications and associated...

    Find the bearing specifications and associated design installation requirements. If the install exceeds design requirements then expect accelerated time too failure.
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    Engineers Edge Static's 2D modeler and Structural...

    Engineers Edge Static's 2D modeler and Structural Calculator will allow you to define any mechanism and applied loads you want.

    See:...
  18. Yes, this is a common practice of having a note...

    Yes, this is a common practice of having a note that "geometry and dimensional data shall be derived from the electronic database". Some organizations have a title block area defining the reference...
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    Conservation of energy says that some of the...

    Conservation of energy says that some of the rated power consumption will be turned into electrical function, such as light or whatever the electronics is doing and the balance left over turns into...
  20. Looks like a fatigue crack turned failure over...

    Looks like a fatigue crack turned failure over repeated applied stress. The root of the thread is a classic failure point -assuming the design and installation did not have shear force on the thread...
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    The enclosure would be treated like a single...

    The enclosure would be treated like a single component, loading defined and the highest stress areas computed. From there, a more detailed analysis conducted at those high stress areas and a Factor...
  22. The start/run capacitor is easy to test.. and the...

    The start/run capacitor is easy to test.. and the fan motor can be tested as well. Usually checking the Y or Delta winding resistance and a run current check should be performed.

    Certainly...
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    Well, yes it is. For example, if you own a car...

    Well, yes it is. For example, if you own a car the rear view mirror mounting base is "epoxied" to the glass. Grooves can help with selected materials though I would consider circumference...
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    Bead blasting specification often include the...

    Bead blasting specification often include the bead size - nothing more.
  25. Yes, in general there should not be any...

    Yes, in general there should not be any redundancy in tolerance or dimension specifications. Can cause confusion and even conflicting requirements.
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