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  1. jasoncwells

    Compression Ignition in Pneumatics

    A long time ago, I recall that there is a concern with compression ignition of oil or other flammables inside a pneumatic system if the rate of pressurization was too high. The place that I used to work had really high air pressures. I'm not a pneumatics guy as my day job. My google-fu gives me...
  2. jasoncwells

    Deleted My Master's Degree

    A few years back, I was looking for work. My interview request rate was about 100:1 for the applications submitted. I deleted my master's degree from my resume and my hit rate went to about 10:1. Has anyone else also made a similar observation?
  3. jasoncwells

    Not Knowing is OK

    It is OK to not know something. This message goes out to all my novice engineers. It might seem like the above statement is anathema to engineers. After all, we are paid to know things. What we do is enormously difficult. No one expects anyone, not even senior engineers, to know everything...
  4. jasoncwells

    Strange Notation on Fillet Radius

    I've never seen this before. This is taken from SAE J1231 figure 1. What does that notation mean on the fillet radiuses of the hose barb? Specifically, what is the 0.50/ before the 2.25R and the 0.25/ before the 1.00R? Regards...
  5. jasoncwells

    Best Reference For Mechanical Power Transmission in Cars

    I've got my copies of Bruhn, Roark's, AISC, etc. Which book is the primary reference for engineering mechanical power transmission in cars? The book would included breaking down elements individually, like bearings, CV joints, different varieties of gears, clutches, and shafts and perhaps also...
  6. jasoncwells

    Well Defined Bolt Grip Lengths

    Where do I look to find structural bolts with a well defined grip lengths? I have good access to industry specs so a referal to the right docs would serve. I am familiar with aircraft bolts. Aircraft bolts have grip lengths in 1/16 inch increments (e.g. NAS6604-12). As I looked through ASME...
  7. jasoncwells

    Jagged Font Rendering in Catia V5

    When working in the drafting workbench, both Type 1 and True Type fonts are rendered poorly to the screen. I am pretty sure it is a question of anti-aliasing. No settings that I have tweaked have resulted in a smooth rendering of fonts to the screen. Catia's display...
  8. jasoncwells

    Resource For Compatibility Of Different Alloys/Grades in Welded Joints

    Can one of you folks please recommend a spec that discusses the compatibility of different alloys/grades of steel in a weld joint? I am not doing anything exotic. It occurs to me though that there can be pitfalls when joints have differing alloys. I'd like to do my homework. I don't spec welds...
  9. jasoncwells

    Sheet Metal Joggles

    Can anyone point me to a good reference on documenting a sheet metal joggle? I haven't done a lot of sheet metal. What I have done was made by in-house skilled people and used in-house so I was able to fall back on my people and not worry about details. I expect that I could spend a lot of...
  10. jasoncwells

    Tolerances Suitable for Tool Diameters

    Can anyone point me to a reference for tolerances applicable to diameters of mills and drills? I know I can conjure up something that will work using max, min, or limits. I'd prefer to use tolerances based on a long history of general use and standardization than tolerances I pull out of my...
  11. jasoncwells

    General Surface Profile in a Note

    Do you guys feel like it is appropriate to place a general surface profile tolerance in a general note? The concern that I have is that you don't have a leader line to apply the all-over symbol, nor is it easy to add the text "all over" under the feature control frame within the text notes. So...
  12. jasoncwells

    Figure 4-8 of ASME Y14.5-2009

    Figure 4-8 in the GD&T spec shows a datum reference frame. I am aware of the two mutually perpendicular planes that exist on the axis of the part per section 4.10.3. The part that puzzles me is, how are those two planes oriented about the part axis? That is, why did the author of figure 4-8...

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