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Modeling a rotary Eccentric Shaft

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AnthonyJ777

Mechanical
Sep 12, 2019
9
Hello all,

I'm working on a model in Creo 6.0 of an eccentric shaft for a rotary (Wankel) engine. I'm struggling to model this draft feature on one of the lobes. You can see from the drawing it starts out as a 45 degree draft and then tapers to a 30 deg draft but I've yet figure out how to blend a draft like that into the outside diameter of the lobe.

Capture_s5vfhl.png


Here is where I'm at with the model
capture2_i0tjaz.png


Here is what one looks like that I found online
capture3_g1fygr.png
 
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It looks like the 45 degree feature is a conical cut, centered on the axis of the large cylinder. Likewise the 30 degree cut is also concentric with the axis of the large cylinder.
 
Thank you, yes that was correct. The drawing was a little vague.
 
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