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Can some one explain how i can model an arch with a linear change in diameter?

Question asked by Amer Khalil on Feb 7, 2020

i am trying to create a cam, i have the drawing but im not sure how to approach the sketch. 

 

the drawing dimensions with statements like " spiral A from 7.5 to 70 degrees: decreasing from R19 to R17.3 linear with degrees, counter clockwise" can some one explain how i can sketch this? I am not sure what commands or features to use. can this be achieved with the cam tool ?

 

i have attached a picture of the drawing

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