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  1. TomFin

    Vibe Input, Random or Sine?

    This is a situation where the customer did not require a spec, but the sales engineer wanted some piece of mind that the product would endure application environment. This aforementioned vibe spec is a spec that he used a while back to test another product for a seperate,but similar type of...
  2. TomFin

    Vibe Input, Random or Sine?

    The following vibration spec came across my desk almost on a cocktail napkin. Vibration/ Shock Spec: Frequency Range: 10Hz to 40Hz; amplitude = 0.1” p-p 40Hz to 2000Hz; acceleration = 4g RMS Frequency Period: 30 minutes; 10Hz to 2000Hz and return Test Time: 3 hours...
  3. TomFin

    How to connect two shafts

    If you are concerned with buckling you can always brace the shaft at an intermediate location. The shaft then would have to buckle in the second mode, which will increase your critical load. Failure is a prerequisite of successful design
  4. TomFin

    "CL" Symbol Manditory?

    Like TheTick states, you should ask QA to quote this privy "CL" business. Show them how all the cylindrical drafting examples pulled from Y14.5-1994 provide dashed center lines without employing the letters "CL" Failure is a prerequisite of successful design
  5. TomFin

    Just Another Shaft Fit Question

    Hi, I'm interested in properly specifying the bore for a keyed sprocket hub. The 2" sprocket will sit over a 3/4" drive shaft that rotates ~3rpm and ~1000 lb load. Everything has been sized except for the fit class. I have just about exhausted my internet resources looking to find which...
  6. TomFin

    lost in communication with colleagues

    One of the downfalls of email is they are often misconstrued because they are read out of context. Suspicions and presumptions from your sub-conscious are actively interpreting or setting the mood of the letter. So if you've felt in the past that he is offensive you probably will tend to...
  7. TomFin

    Car Brake Hydraulics

    Have you tried a factory service manual? The hydraulic and electric schematics are usually present. As far as pressures required, that depends on other dynamics such as load,acceleration,friction surface etc,etc,etc. Failure is a prerequisite of successful design
  8. TomFin

    Static Force Analysis of a Seat

    First of all the system is unstable as it looks. I'm sure there is some sort of actuator that attaches to the parallel arms or Suspension Upper Plate which needs to be included as an external force/reaction in the analysis. Observing the OPs pics there is indeed 4 "Pins" which he has...
  9. TomFin

    Static Force Analysis of a Seat

    If you simplify the suspension upper plate as part of the parallel linkage, this is the Force analysis result... See attached. This pic looks like it is from MGA's FMVSS Test Fixture Failure is a prerequisite of successful...
  10. TomFin

    Static Force Analysis of a Seat

    You can reduce the number of unknowns once you realize that the links in your parallel linkage are 2 force members. Being two force members you can deduce the sense (direction) and solve for magnitudes. Failure is a prerequisite of successful design
  11. TomFin

    Conveyor gearbox output shaft failure

    Observing the radial cracks I also notice a subtle texture difference which appears to create a circular fine grit pattern just a little off-center (quadrant II for geometry gurus). This is typical in variable loaded shafts subject to torsional loads. The presence of cracks stemming from the...
  12. TomFin

    Structural strength and sheetmetal

    How about a combination corrugating or forming the sheet-metal so that it will add stiffness across the plane that you need it. With this added stiffness you might be able to cookie cut some material out of the sheet, ergo weight reduction. Tom Failure is a prerequisite of successful design
  13. TomFin

    Dimensional Tolerancing

    The drawing block does not contain a specification for the tolerance range of a 0 .X callout. I agree that one has no other option than to logically resort to sig-figs. But realistically there is a narrow likelihood of an inspector or machinist of recalling sig fig rules with enough confidence...
  14. TomFin

    Portable Gas Containers

    Sorry about that, just American colloquialism, yes gasoline. And yes, Rubber Maid makes a gasoline container. Failure is a prerequisite of successful design
  15. TomFin

    Portable Gas Containers

    Hello, I noticed ASTM F852-99 on the side of my rubber maid gas container and am now curious of the regulations. Is anyone familiar with ASTM F852-99 standard for portable gas containers? If you've ever run across it, what are the main requirements of the standard? Thanks Tom Failure is...
  16. TomFin

    Loose cannon colleague

    I think a passive idea would be to print this discussion out and staple it to his/her chair and stamp it FOR REVIEW. I am too having a similar problem with our drawing checker if you want to call her that. She is one of those bipolar people who draw you in with their kind gestures of snacks...
  17. TomFin

    Perpendicularity of a frame

    I agree with VCastro66. The total swing would be .12. Each call out should be inspected individually with respect to Datum A. You can visually observe this under the ASME-1994 std through FIG 6-34 - 6-42. Failure is a prerequisite of successful design
  18. TomFin

    Symmetrical Tolerancing

    Ringman, That was just a pependicular hole for a spring pin to keep the hinge pin from sliding out the back end. So, no it is not associated with the alignment. Tom Failure is a prerequisite of successful design
  19. TomFin

    SW Part Popups from Assy

    Ok. Thanks CBL Failure is a prerequisite of successful design
  20. TomFin

    SW Part Popups from Assy

    Greetings Civilization, I've just noticed that on some assemblies, after I close the viewing window, there are still additional parts open that I never opened. These parts belong to the assembly that I just closed. I'm assuming these parts automatically opened when I open the assembly. Does...

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