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  1. cmb042

    Elongation gage difference

    thread404-411498 Just to follow up on an old thread I posted. I determined the issue was a change of how elongation is measured. The requirement I was referencing tested using a 2in gage length. This is the standard default gage length defined by ASTM E8. This is what is generally listed...
  2. cmb042

    Elongation in Steel

    So how does one quantify the relationship between elongation and damage tolerance? For example lets say my part is a beam, I can determine how much of the beam can be damaged/missing for the typical load to cause stress in the beam to exceed the yield strength. How does that involve the...
  3. cmb042

    Elongation in Steel

    Main Question: Is the elongation value of any objective use if the part is designed to operate below yield strength? I understand that in sheet metal bending or interference fits knowing how much strain a material can tolerate before breaking could be valuable. I have also had it explained...
  4. cmb042

    Best way to remove welded electrical connections?

    What is the best and/or standard method for removing a welded electrical connection. Specifically the connection on an automotive alternator rectifier diode stem and the connector assembly is welded. A little glob of copper sitting on the tip of the stem joins the copper runner of the...
  5. cmb042

    Gyroscopic Forces

    Thank you all, especially Hydtools. I was able to find the answer I was looking for in another reference which is backed up by Hydtools link. Basically the gyroscopic force is a moment that results from the cross product of the angular momentum and the velocity of procession in radians/s. The...
  6. cmb042

    Gyroscopic Forces

    I am trying to calculate the force imparted on a rotor bearing when the rotor is at speed and the vehicle takes a hard turn. I can find the rotor moment of inertia and its angular momentum, but not sure how to find the force due to gyroscopic action. Most of the information I have found...
  7. cmb042

    How does an O-scope measure multiple waves with one probe?

    I recently saw something on an oscilloscope that made me wonder how an oscilloscope works. It was a step function, with each step boxed off, having 4 sides. Plus there was a diagonal line inside each box. The way I understand it, a digital O-scope would sample the probe and should only find...
  8. cmb042

    Capacitance of a hydraulic capacitor model

    I think it works fine for AC. It blocks steady state pressures, and the flow out is derivative of the pressure. If you increase and decrease the pressure in cycles like AC, it passes through the hydraulic model. You can even say take a wave pool, take a section cut of it, and place the...
  9. cmb042

    Capacitance of a hydraulic capacitor model

    So to increase the capacitance one would reduce the spring constant of your piston accumulator?
  10. cmb042

    Capacitance of a hydraulic capacitor model

    So what is capacitance then? The area of the rubber layer as Charlie says doesn't make sense to me. Regardless of the bladder size, wouldn't a given pressure displace the same amount of water? I tried to demonstrate the model using a circuit in the lab. A driver outputted 10V sq pulses...
  11. cmb042

    Capacitance of a hydraulic capacitor model

    I was trying to explain how a capacitor works to someone who considered themselves a "mechanical". I used the hydraulic model of a hollow metal sphere with a rubber bladder separating it in half and a port connected to each half, both halves filled with water. Voltage is pressure Current is...
  12. cmb042

    SW 2009 Colors and Appearance

    I managed something of a workaround. Looks a little off, but acceptable, and only 5 times the work. You can find the old textures in /solidworks/data/images I made a copy of the texture and opened it in snagit editor, did a fill with the color of my housing with a 75% tolerance and 50%...
  13. cmb042

    SW 2009 Colors and Appearance

    From what I can tell from other sources, 2009 eliminated the old color and texture functionality and added it to the photoworks appearances. This is unfortunate because I don't have a real view compatible card, and I was satisfied with the previous functionality.
  14. cmb042

    SW 2009 Colors and Appearance

    Thanks that does seem to effect it somewhat. But it doesn't seem to be the root of the problem. Also, having an issue with textures. I had a brass part with a knurl. In 2008 the knurl was brass colored, now it is the default. The surface with the knurl doesn't seem to have color options. I...
  15. cmb042

    SW 2009 Colors and Appearance

    I want a part to be white. When I open the appearance property manage and select white color for the part, I get a slightly lighter shade of gray (the default color). In 2008, this usually meant I had a color set for the feature or surface as well. This isn't the case here. Least not that I...
  16. cmb042

    DC-DC design how to

    I want to learn how to design a low noise, low current, high temperature, DC-DC HV power supply. Anybody have design notes or books they would recomend? Things like noise compensation and transformer selection/design.
  17. cmb042

    Series Zener Instability

    I am not concerned with power, the whole thing pulls about 42mA. The zeners are rated more than 1W. While I agree that there are better voltage regulators out there this is not my design. I'm trying to tweak it not reinvent it. Circuit is posted for those that want a look at it...
  18. cmb042

    Series Zener Instability

    The multivibrator is rated for 20V. I don't think it's the problem, least not directly. I was thinking maybe some sort of feedback loop, the pulse from the multivibrator changes the voltage lvl the zener sees, some interaction between them bounces it around... There is a 10uF cap parallel...
  19. cmb042

    Series Zener Instability

    So how to you calculate the headroom of a zener? It is a single solid state junction, so I can't think of anything that would delay its response. It should be practically instantaneous. Even datasheets for zeners seem to dwell on temperature properties. I want to understand why it is not...
  20. cmb042

    Series Zener Instability

    My regards circuit jockeys, I have a sensor device that is lowered into a well. Its power cable also serves as its data transmission line. The voltage supplied to the circuit is regulated by two zeners in series. This creates two voltage rails, one to power the sensor, the other lower...

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