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Recent content by MikeVV

  1. MikeVV

    FUNCTION FOR LINEAR INTERPOLATION

    I have a spreadsheet that performs interpolation using the formula: delta_y / delta_x = delta_y0 / delta_x0 and solving for y It also uses MATCH() and INDEX() functions with data tables to identify the proper rows of data to interpolate. Reply to MJVanVoorhis@CS.com for a copy - this...
  2. MikeVV

    disassembly of a helicopter

    A "mathematical approach to maximize my out-put in disassembly of an aircraft," - i.e., minimize the time needed to disassemble the machine - could be found in a variety of ways - the key issue is defining the "critical path," that sequence of operations that paces the entire...
  3. MikeVV

    Inserting A Digital Picture In AutoCAD 14

    I have pasted digital satellite photos under 3d models of buildings to do site layouts and renderings. The photo is resized using reference points within the model (it has handles that can be dragged into proper position). The photo should be placed on a separate layer and moved under existing...
  4. MikeVV

    Fortran and Linux

    Is anyone aware of a good source for a Fortran compiler and debugger that operates under Linux?
  5. MikeVV

    Hippocratic Oath

    How do we, employed AND ethical engineers, convince "aggresive" managers that they need to also be ethical? This is a real problem in many companies. Who is truly in command? It is easy to show that an engineer, who stands in the way of "progress" on a project, is...
  6. MikeVV

    Engineering Ethics

    I'm going to download this post and read it - it is long however. Here's a shorter version that might be useful: Faith of the Engineer I am an engineer. In my profession I take deep pride, but without vain glory; to it I owe solemn obligations that I am eager to fulfill. As an engineer, I...
  7. MikeVV

    dynamo and electric generator

    Yarock, One nifty device for making such a conversion is an electric generator (just kidding). Actually, the same phenomena is used to derive electrical energy from the propulsive force of exhaust gasses in a magnetohydrodynamic converter. These devices use rocket engines to force an...
  8. MikeVV

    Does anyone need Fortran Programmers?

    I have found that using Excel and VBA is valuable in today's environment.&nbsp;&nbsp;I use Excel to solve most engineering analysis problems on a daily basis.&nbsp;&nbsp;There are a few things that I would like to do and a forum for this topic would be good.<br><br>I am also getting into Linux...
  9. MikeVV

    Storing energy with mass lifting

    Thanks for your reply,<br><br>I would expect that such methods for storing energy would have an &quot;up-front&quot; cost.&nbsp;&nbsp;The use of a water tank is limited in its efficiency and mass.&nbsp;&nbsp;The use of the entire building weight is better on both of these facets.&nbsp;&nbsp;If...
  10. MikeVV

    Stress Concentration Factors for Threads

    Drive shafts typically experience cyclical loading so materials with an endurance limit are needed, otherwise no matter what you do in terms of design, the shaft will eventually fail.&nbsp;&nbsp;Stress concentration factors are typically related to the part geometry and loading condition only...
  11. MikeVV

    how to convert Teknicad drawings to AutoCAD drawings?

    The transfer of IGES files from the Vax to the PC can also be done via email.&nbsp;&nbsp;This simplifies the connections (no cable, baud rates, etc.)&nbsp;&nbsp;The file transfer can be aided by using a file compression routine to minimize the size of the email attachment.&nbsp;&nbsp;Vax...
  12. MikeVV

    Shell Expansion

    Shell expansion can be performed on 2d or 3d entities using the &quot;scale&quot; command.&nbsp;&nbsp;The center of the shell and amount of shape size change (factor) is needed.&nbsp;&nbsp;AutoCAD R14 can use lisp but scripts and VBA are also available.&nbsp;&nbsp;<br><br>The expansion might be...
  13. MikeVV

    tube bending

    The formula referenced is applicable to bending up to the yield point of the material.&nbsp;&nbsp;Beyond that point, plastic deformation (permanent) occurs and the formula will predict higher forces than actual which, if you are only sizing for worst case loads, should be...
  14. MikeVV

    Spacecraft Design Standards

    Benjamca, I am aware of three organizations that are proceeding along the &quot;standard&quot; spacecraft philosophy.&nbsp;&nbsp;Ball Aerospace, Colorado Springs, CO, has a spacecraft bus specifically designed for use as a secondary payload for Boeing's (formerly McDonal Douglas) Delta II launch...
  15. MikeVV

    Reference dimensions on blueprints

    Reference dimensions are often combinations of other dimensions that &quot;add-up&quot; to a value that is useful, but not one that should be verified thru inspection.&nbsp;&nbsp;&quot;Dual dimensioning&quot; occurs when two or more dimensions (that do have tolerances and need to be inspected)...
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