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Recent content by BobM3

  1. BobM3

    Aftermarket Intake Gas Millage Question

    So with the throttle closed a bit, wouldn't there be less air/fuel going into the engine?
  2. BobM3

    To achieve a high precise 3 axes alignment

    I don't think you'll be able to locate anything mechanical to that precise a position. Lasers are often used for precise alignment. See http://www.renishaw.com/en/laser-interferometer-systems--6800.
  3. BobM3

    6-axis load cell force calculation

    btrueblood - Even more incredible is that this 6 axis transducer is for a machine tool. It would have to be stiff in all 6 axes which would make the problem with cross talk even more difficult. happygopher - Is this for a lathe (transducer connected to tool bit) or a mill (transducer...
  4. BobM3

    6-axis load cell force calculation

    I'm not quite sure what that means. Where is the origin? If the origin is at the center of the Fx,Fy and Fz measurement points within the load cell, then Fx,Fy and Fz directly read the external forces applied at the tool tip (assuming no moments applied at the tool tip). In that case you...
  5. BobM3

    6-axis load cell force calculation

    Yes, you'll have 6 equations and 6 unknowns. Apply the 3 forces and 3 moments at a point on the cutting tool and use the geometry and the 6 measured forces to calculate the unkown forces and moments at the tool tip. You'll need to know the spacing between the force measurement points inside...
  6. BobM3

    Aftermarket Intake Gas Millage Question

    For the same engine output power, if you could make the engine more efficient (less air restriction on the input), wouldn't the input power be less?
  7. BobM3

    RC Series Circuit

    Do you also want it to engage slowly?
  8. BobM3

    G-forces

    Since it's a fluid bearing (hydrostatic I'd bet), I'm guessing the bearing manufacturer is interested in how much force is developed at the bearing supports due to radial acceleration of the supported member. If so, a first approximation would be to take the mass of the supported member and...
  9. BobM3

    Steel Washer Design

    I can't directly answer your question however where I used to work we used collars when we were using socket head cap screws on slotted holes: http://ruland.com/ps_collars_shaft_sc.asp
  10. BobM3

    Friction Torque on Rotating Disk

    GalEng - Just to clarify, you have the friction coefficient or the friction? If it's the coefficient then you need to multiply that by the normal force (how hard you are pushing the mob down onto the floor) to get the friction.
  11. BobM3

    Pivot friction equation of a ball and socket

    SKF has a section on this: http://www.skf.com/portal/skf/home/products?lang=en&maincatalogue=1&newlink=3_0_32
  12. BobM3

    Pivot friction equation of a ball and socket

    Are you making your own? If you buy them then check with the manufacturer. For the ones I've used the initial friction can be much higher than the friction after so many cycles of operation.
  13. BobM3

    mains voltage sensing

    Fairchild MID400 AC Line Monitor Opto (Digikey sells them).
  14. BobM3

    Which Book(s) Would be Best?

    Design of Weldments by Blodgett. Don't let the title fool you - it's not just about welding.
  15. BobM3

    vibration sensors - 120 hertz

    Did you find a switch that is sensitive to just 120 hertz? If not, you may have to build a mechanical "filter" by mounting the switch on a cantilever and tuning to 120 hertz for the natural frequency.
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