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  1. enirwin

    Asymmetrical Loading of Helical Spring

    Thank you all for your help. I can perform a test, and have already done so, but I was trying to determine if there was a proven way to address this problem analytically for future use. It appears that FEA is probably the best analytical approach. Thanks again.
  2. enirwin

    Asymmetrical Loading of Helical Spring

    Let me try this another way. Please see the attached sketch showing a helical spring between two plates. One plate is rigidly fixed and the other plate is hinged. Due to the constraints on the motion of the plates, one side of the spring will deflect more than the other. Is there a was to...
  3. enirwin

    Asymmetrical Loading of Helical Spring

    I'm not sure it matters, but you can assume that it's liquid pressure sealed between the plates until they begin to separate. Separation results in leakage. What I'm really after is how to predict load and deflection for a helical spring that is asymmetrically loaded. Thanks.
  4. enirwin

    Asymmetrical Loading of Helical Spring

    I have two discs clamped together by a helical spring. Pressure is applied to a semi-circular area between the discs. As a result, the separating force is not applied uniformly around the circumference of the spring. Is there a way to calculate the pressure at which the discs will begin to...
  5. enirwin

    Temperature Impact on LRC

    dpc, It didn't occur to me that the resistive portion of the impedance would be small and therefore, even though the resistance might change quite a bit, the impact on the current would be small. Very helpful. Thanks.
  6. enirwin

    Temperature Impact on LRC

    Is there a simple way to estimate the impact of winding temperature on the locked rotor current of an AC induction motor? I know the locked rotor current at room temperature and need to estimate it at colder temperatures. I don't need an exact prediction, just a ballpark estimate. Thanks.
  7. enirwin

    Gear Pump Design Guides?

    You can estimate spur gear pump flow with the following formula. This will allow you to run through some sizing options before starting gear design. G=(N*W*C*(D-C))/73.48 G=pump flow(gpm) N=speed (rpm) W=gear face width (inches) C=center distance between gears (inches) D=gear OD (inches)...
  8. enirwin

    Hardcoat for 2024 Aluminum

    I am experiencing fretting wear between a plate made of O-6 tool steel and a housing made of 2024 aluminum, anodized per MIL-A-8625, Type 2, Class 1. The steel part was originally aluminum but was changed to resist some pretty severe cavitation. I am working to eliminate the motion that is...
  9. enirwin

    Material Selection for Ethylene Glycol / Water Pump

    I'm considering an AC motor driven, positive displacement pump for use in a cooling system where the coolant is a 50/50 mix of water and ethylene glycol. Can hardened alloy steels be safely used (pump gears, shaft, etc.) in this environment if a corrosion inhibitor is used? Also, can the motor...
  10. enirwin

    Magnetic properties (Steel)

    dgallup, Thanks for the data. Can you provide the source? Thanks.
  11. enirwin

    Formability of Cast 304

    Thanks to all. In answer to the question, why swage a casting, the swaging is an assembly operation with a mating part. The casting is desired because the geometry of the part requires a lot of machining that would be eliminated by use of a casting. Again, thanks to all for the responses.
  12. enirwin

    Formability of Cast 304

    I currently have an assembly that requires a swaging operation on a wrought 304 part. Because of the complexity of the part, I've been asked if it can be cast rather than machined from barstock. Can I expect the same formability from a cast 304 part as a wrought 304 part? I don't want to...
  13. enirwin

    Metric Conversion

    Thanks to Zappedagain and Cummings54. This is very close. In fact cumming54's function works well for all numbers except it doesn't identify trailing zeros as significant. For example, if I have a dimension 1.000 it indicates accuracy out to the third decimal place, so the zeros are...
  14. enirwin

    Metric Conversion

    I want a function to convert numbers from inches to mm using the following standard rules. 1) If the first significant digit of the metric value is greater than or equal to the first significant digit of the inch value, round the metric value to the same number of significant digits as the...
  15. enirwin

    Custom Excel Function

    Disregard my previous post. I misunderstood what I was reading in the documentation. I tried it and it works perfectly and does exactly what I need. Thanks Joerd.
  16. enirwin

    Custom Excel Function

    I found the application, but the documentation indicates that it is only set up for four functions. Is this correct? If so, is there a way to make it accept more? Thanks.
  17. enirwin

    Custom Excel Function

    I'm creating a custom function in Excel using VBA. Does anyone know how to add variable descriptions that will display in the insert function dialog box? Thanks.
  18. enirwin

    VBA Module in Excel

    That's it. Thanks.
  19. enirwin

    VBA Module in Excel

    I'm trying to create a custom function in Excel using a VBA module. My problem is that I can't get Pi to work. If I enter 3.14 my function works properly. If I use Pi I get an error. It seems to be using 0 for Pi. For now, I'm using 3.14159265358979 for Pi, but I'd rather just use Pi...
  20. enirwin

    Involute Spline Question

    arto, Do you know where I can get copies of the Dudley articles? I've tried to find old Product Engineering articles before with no success. Any help would be appreciated. Thanks, enirwin

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