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  • Users: sreid
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  1. sreid

    super precision rotating mechanism

    New Way Air Bearings https://www.newwayairbearings.com/
  2. sreid

    Fuses for circuit powered by VFD DC bus

    https://www.digikey.com/en/product-highlight/s/schurter/aso-series-high-performance-fuses
  3. sreid

    solve a problem in a job interview

    How about it's a question who's answer can be marker wrong no matter what you answer so they can low ball you on the salary offer.
  4. sreid

    Armor Grounding - If not used as earthing conductor

    Just an opinion. If a hot wire shorts to the armor (say a nail is driven thru the cable)and the armor is not grounded, you have a Hot armor.
  5. sreid

    torque sensing with stepper driver

    I agree with all that cswilson says but I'd suggest using a Slotless Brushless Motor with No shaft Seals. Current = Torque. https://www.machinedesign.com/technologies/slotless-motors-smooth-way
  6. sreid

    Best o ring material for marine heat exchanger

    UHMWPE https://en.wikipedia.org/wiki/Ultra-high-molecular-weight_polyethylene
  7. sreid

    Best o ring material for marine heat exchanger

    Hypalon https://en.wikipedia.org/wiki/Hypalon
  8. sreid

    Choice of electric actuators

    For the rotary motion-step motor let me suggest Harmonic Drive. http://www.harmonicdrive.net/
  9. sreid

    Choice of electric actuators

    For a step motor-Linear Actuator let me suggest Lin Engineering. https://www.linengineering.com/
  10. sreid

    Digital Controller Implementation

    Mathematically if you input a 1 volt, 1 radian/sec sine wave to the plant input (Vin) and measure the plant output voltage (Vout) (Again a sine wave at 1 radian/sec with an amplitude A) the plant gain is Gain = Vout/Vin = A/1 = A
  11. sreid

    Digital Controller Implementation

    There is probably a difference between the simulation and the real plant Gain. An Integrating Plant has an Integral Gain which is the plant gain at one radian per second.
  12. sreid

    PCB material

    https://www.mcmaster.com/garolite-plastic
  13. sreid

    Ideas about the noise source causing this.

    Let me suggest that the noise could be from an external source on the AC Power. Try a line filter.
  14. sreid

    Press Fit Stresses - Three Ring?

    If the third outer "Ring" is the transmission Aluminum case the problem might be looked at differently. 1) Interference between a beqring race and the steel ring it's mounted in is well established. 2) When hot the steel ring must not get loose in the Aluminum. 3) When cold the aluminum must...
  15. sreid

    Press Fit Stresses - Three Ring?

    At some point it's time for FEA.
  16. sreid

    Surface finish on SUS304 to prevent laser reflection

    Vanta Black Spray Paint https://www.surreynanosystems.com/super-black-coatings/vantablack-s-vis
  17. sreid

    Surface finish on SUS304 to prevent laser reflection

    Velvet Flock, Adhesive Backed...
  18. sreid

    One Way Bearing

    The sprags are sliping. See Spragform. https://www.formsprag.com/products/General-Purpose-Clutches/Ball-Bearing-Supported
  19. sreid

    connecting two spherical bearings to connect a linear actuator to a plate

    Commonly called "Rod Ends." They come in a range of qualities. http://www.aurorabearing.com/index.html
  20. sreid

    Stepper Motor Time to Speed

    Skogsgurra, From "Thrust" in Wikipedia; 1) A rocket is propelled forward by a thrust force equal in magnitude, but opposite in direction, to the time-rate of momentum change of the exhaust gas accelerated from the combustion chamber through the rocket engine nozzle. This is the exhaust...

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