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Recent content by badservo

  1. badservo

    Different AC voltage in multicore cable

    Most AC motors will not like having the voltage changed while the frequency remains the same.
  2. badservo

    Measuring Sheet Angles & Flanges

    Maybe something like this? https://reprapltd.com/3d-printed-angle-gauge/
  3. badservo

    Fixed bolt head

    If I understand correctly, you have a rod that is only threaded at each end and you want to fix a nut to one end so it functions like a bolt instead of a threaded stud. I would also try the proper Loctite and primer/activator first, but what about castellated nuts...
  4. badservo

    Hydraulic motor for very slow rotation

    I agree with Brian, a proper gearbox and motor is the way to go. Stepper, servo, or if close enough is ok, an induction motor with VFD or even a DC motor may work. Hydraulics tend to not work the same way hot as they do cold, internal leakage in the pump and motor will change with temperature...
  5. badservo

    Wiring a sliding Arm

    Cable carriers may be the term you are looking for. https://www.mcmaster.com/cable-carriers
  6. badservo

    Star-delta verse Dahlander

    94A @ 460V doesn't sound right for a 30HP motor so you may want to verify that if picking a transformer.
  7. badservo

    confused with what's going on, ground/neutral issues, tripping GFCI etc.

    There is no neutral conductor going to the hot tub panel so it is not able to supply 120V circuits. You are connecting the hot tub panel ground through the neutral conductor of the GFCI which is also wrong. The combination of poor grounding at the meter, the ground rod at the shed, and the...
  8. badservo

    Damaged lead on contactor

    It could be something in those boots causing corrosion. Try a different boot material/brand, if you can't find something else to replace it, the Penetrox or No-Alox may be enough to stop the corrosion. To add to itsmoked's list: 5) Bolt too long, not fully threaded, or washers missing, which...
  9. badservo

    Synchronizing a diesel or inverter-based generator with the utility grid without a ground reference

    [deadhorse]"Ground" is not the same thing as "Neutral". Delta,open delta, wye, floating neutral, resistance grounded neutral, solidly or grounded neutral are chosen based on load requirements and how you want it to fail when something goes wrong. You need every metal surface grounded to protect...
  10. badservo

    RS-232 Data Parity Confusion

    Maybe they are trying to use the parity bit as a 9th bit to flag "This byte is the target address, all others are data". See if there is a setting in the host OS or virtualization software to forward the parity bit without corrections.
  11. badservo

    Machining accuracy with silicone rubber

    I made a few special seals using acetal for the mold and a 2 part silicone with good results. Didn't measure it post bake, but it seemed like a perfect fit.
  12. badservo

    Need Grease recommendation for 6,500 rpm bearing

    In addition to romke's answer, the volume of grease is also important. Too much grease will cause excessive heating.
  13. badservo

    Crane Collapse in NYC

    http://www.eng-tips.com/viewthread.cfm?qid=403171 http://www.reuters.com/article/us-new-york-crane-idUSKBN13Y2O8
  14. badservo

    Plate deflection and stress formula

    Thanks, metengr's link was close, but there was a better match to my situation Link Roark's Formulas for Stress and Strain would work as well for just about any situation, adding to my collection.
  15. badservo

    Plate deflection and stress formula

    I am looking for a formula to determine max deflection and stress of a plate (round or square) that is simply supported in the center (round support) and a uniform load over the whole surface. Can anyone point me to a good example? Thanks.
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