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• # Need someone better at math :)

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

1. ### JC_BiggsActive 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_BiggsActive Member

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

4. ### PeteWell-Known Member

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Any chance of that picture?

5. ### GarethWChief ClickerStaff Member

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Good call! I got lost in the 2nd paragraph

6. ### swertelActive 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. ### xmechanicActive 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_BiggsActive 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_11Well-Known Member

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

10. ### xmechanicActive Member

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

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