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  • Users: Warpspeed
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  1. Warpspeed

    Need to identify special grease.

    I have an in/out compressed air actuator with a rubber diaphragm, mounted between halves of simple pressed mild steel covers. It contained some rather strange looking grease within the air chamber side, which needs to be replaced during clean up and rebuild. This grease is unusual, in that it...
  2. Warpspeed

    Force multiplication of PS

    Will the force multiplication of hydraulic power steering (feel) be directly influenced by hydraulic line pressure ? Or is it a design function of the relative areas in spool valve and rack piston ? I realise that there needs to be sufficient pump pressure to generate enough basic rack force...
  3. Warpspeed

    How to locate the mass centroid axis ?

    The commonly available suspension simulation computer programs require the entry of an effective centre of gravity point at each end of the car located above each axle centerline. This may be at a different height at each end, depending on how the mass centroid slopes from front to rear. It...
  4. Warpspeed

    Attracting force of an electromagnet ?

    I need to estimate the attraction (lifting) force of an electromagnet that has 5,700 Ampere turns, and a 1.6mm air gap. Can anyone help me with this ?
  5. Warpspeed

    What thermocouple type for EGT measurement ?

    What is the most frequently used thermocouple type for exhaust gas temperature measurement for gasoline engines ? There are all sorts of conflicting requirements including temperature measurement range, millivolt output, and life in oxidizing/reducing atmospheres. I am just wondering what you...
  6. Warpspeed

    What fan motor capacitor size ?

    I have a single phase 240v 50Hz Brinsmead condenser fan motor rated at 0.28 Hp, 1.45 full load amps. It is the usual two winding capacitor start/run type motor. What value of capacitance would usually be used with something like this ?
  7. Warpspeed

    Acoustic attenuation using sheet lead

    I have an electrically driven high speed centrifugal air blower mounted in an air tight box, and the aim is to make it as quiet as possible. The external size of the enclosure is roughly a three foot cube. The box is made from one inch MDF sheet, bolted and sealed to a heavy welded steel...
  8. Warpspeed

    Star/delta or resistance starting ?

    What are the pros and cons of star delta starting a three phase induction motor, as opposed to resistance starting? And what criteria should be used for selecting suitable resistance values? The application is a high pressure centrifugal air blower operating at 5,700 RPM powered by a 7.5 BHP...
  9. Warpspeed

    Low SG manometer fluid

    Rather than using a shallow inclined water manometer to measure very low pressures, I would like to try a vertical manometer. This would reduce the errors due to slight change of inclination. For this to be effective it would require a suitable fluid that has a specific gravity only a fraction...
  10. Warpspeed

    Homemade lead acid batteries

    I am sure it must be possible to roll up two lead sheets and place these into a beaker of electrolyte to make a practical and very low cost lead acid cell. In any home solar application the batteries are a major expense, and I am wondering if anyone has ever seen this done ?

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