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    Discussion in 'The main mechanical design forum' started by JC_Biggs, Jan 20, 2011.

    1. JC_Biggs

      JC_Biggs Active Member

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      Hey guys, first post on the forums. I am going to school for ME Tech and Im working on a project. I need some help figuring out the dimensions of a particular part. picture a plate of aluminum, 12 inch in diameter, 1 inch thick. now the plate spins on its center point and on the outer rim is 2 bearings (one on each side of the plate) , ok simple enough, the plate is 1inch think, the bearings are 1 inch apart..

      Now the tricky part, is that the plate isn't flat, its shaped like a sin-wave so the tangent contact point of the rollers is gonna change throughout a revolution. at the 90 degree and 270 degree points (high and low) the plate would be one inch thick as its tangent points are where the rollers are 1 inch apart, but the more rotation, the more the tangent points change, until they reverse and go back the other way...

      basically what im trying to get, is a way to plot that change so that i can put the radius into the part in solidworks. im sure it will be a compound radius, but im hoping not. lol so.. anyone that has a few to help me out?? and if this isnt clear, ill try to draw a picture or something. Thanks!
       
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    3. JC_Biggs

      JC_Biggs Active Member

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      anyoneeee.... im racking my brain over this! haha. and i think i made it even more complicated..
       
    4. Pete

      Pete Well-Known Member

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      Any chance of that picture? :)
       
    5. GarethW

      GarethW Chief Clicker Staff Member

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      Good call! I got lost in the 2nd paragraph :D
       
    6. swertel

      swertel Active Member

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      If the problem is that hard to define, perhaps you need to rethink the design to accomplish the same goal.
       
    7. xmechanic

      xmechanic Active Member

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      As to your question Biggs I wouldn't have a clue. I think I understand what your saying though, this is some sort of cam?
       
    8. JC_Biggs

      JC_Biggs Active Member

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      yes instead of using a swashplate. using a cam. im tryin to draw something up right now. new scanner isnt working for some reason, ill get it up soon as possible, its not complicated once you see it, i just dont know exactly what means to the ends
       
    9. cwarner7_11

      cwarner7_11 Well-Known Member

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      It would also help to know the diameter of the bearings...
       
    10. xmechanic

      xmechanic Active Member

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      Taking a wild guess, you are thinking of this for valve operation?
       
    11. SaltCityTech

      SaltCityTech New Member

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      I think this can be done fairly easily in solidworks. Sketch 2 points on a plane, one at +6,0 and the other at -6,0. Then create a plane the desired amplitude of your sine wave away from this sketch plane. Sketch 2 points on this plane at 0,+6 and 0,-6. Exit this sketch and create a 3D sketch and select the 4 points you have created in order around the perimeter. This should create a spline which mimics the sine curve you wanted (I'm not certain that mathematically it will be perfect). You can use this 3D sketch as a path for a sweep feature. Simply sketch a rectangle 1" wide on a perpendicular plane and sweep it around this 3D sketch. That's of course assuming I understood your post! Good luck!
       

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