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    • Recent Content by Bill @ ERG

    1. Bill @ ERG
      Post

      Continuous Change of Direction of Rotation

      I believe that I understand the point that SCIYER is making. The smoothness of the device is a function of the rate of change of acceleration,...
      Post by: Bill @ ERG, Mar 11, 2016 in forum: The main mechanical design forum
    2. Bill @ ERG
      Post

      Continuous Change of Direction of Rotation

      The loading on this rack will be a function of the peak acceleration rather than the rate of change of acceleration. Yes at the ends of the...
      Post by: Bill @ ERG, Mar 2, 2016 in forum: The main mechanical design forum
    3. Bill @ ERG
      Post

      Continuous Change of Direction of Rotation

      Exactly. There should be no "jerk". Acceleration is as smooth as the displacement curve, but opposing (off by 180°). Piston velocity is also...
      Post by: Bill @ ERG, Feb 26, 2016 in forum: The main mechanical design forum
    4. Bill @ ERG
      Post

      Continuous Change of Direction of Rotation

      I believe that the maximum acceleration is at each end of the stroke, but is not infinite, and can be calculated quite easily. For 1000 rpm and a...
      Post by: Bill @ ERG, Feb 26, 2016 in forum: The main mechanical design forum
    5. Bill @ ERG
      Post

      Bolt Strength Calculation for lifting

      Your description did not mention the arrangement of the four bolts mounting the bridge, the base width, or the height to the lifting point...
      Post by: Bill @ ERG, Feb 18, 2016 in forum: Calculations
    6. Bill @ ERG
      Post

      Continuous Change of Direction of Rotation

      Yes there will be be power required to drive this mechanism. There are losses in all the bearings, friction losses in the rack to roller...
      Post by: Bill @ ERG, Feb 18, 2016 in forum: The main mechanical design forum
    7. Bill @ ERG
      Post

      Magnetic attraction threshold distance problem

      Cup style magnet assemblies have a magnet with a steel cup around the magnet, leaving one edge nominally flush with the face of the magnet....
      Post by: Bill @ ERG, Mar 27, 2015 in forum: Calculations
    8. Bill @ ERG
      Post

      Precise angle control

      I checked on the ball seat washers, and they tolerate ±3° of motion, and are manufactured to DIN . I wish to correct my comment above - common...
      Post by: Bill @ ERG, Mar 27, 2015 in forum: The main mechanical design forum
    9. Bill @ ERG
      Post

      Precise angle control

      It is possible to include a drilled rod with flats for the adjustment rod and nut to seat against in the moving plate. If you install a stiff...
      Post by: Bill @ ERG, Mar 26, 2015 in forum: The main mechanical design forum
    10. Bill @ ERG
      Post

      Magnetic attraction threshold distance problem

      Consider using a cup style magnet assembly (circular steel cup with magnet inside). Not only does it increase the holding power, but it also...
      Post by: Bill @ ERG, Mar 26, 2015 in forum: Calculations
    11. Bill @ ERG
      Post

      helical gear and shaft

      I'm not quite sure what you are asking, but in the past, the axial reaction measurement has been used for determining output torque on various...
      Post by: Bill @ ERG, Mar 28, 2013 in forum: The main mechanical design forum
    12. Bill @ ERG
      Post

      Design of Magnetic Wheel

      It is always beneficial to approach the problem with a list of requirements, and limitations. State purpose, limitations of the arrangement,...
      Post by: Bill @ ERG, Mar 28, 2013 in forum: The main mechanical design forum
    13. Bill @ ERG
      Post

      Translation to rotation

      How about using a cable, lifting the lever instead of pushing down on the lever. Place a pin off-center on the upper plate. Attach the cable end...
      Post by: Bill @ ERG, Mar 28, 2013 in forum: The main mechanical design forum
    14. Bill @ ERG
      Post

      Elliptical Eye Bolt?

      I can think of a couple other means, Ron: A small spool or a pair of spacers could be used to ensure proper centering, or a different kind of eye...
      Post by: Bill @ ERG, Mar 22, 2013 in forum: The main mechanical design forum
    15. Bill @ ERG
      Post

      Elliptical Eye Bolt?

      Post by: Bill @ ERG, Mar 21, 2013 in forum: The main mechanical design forum

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