AutoCAD Inventor :: Drain Care Spring

May 29, 2013

Inventor  offers us several options to design a coil of constant pitch with a tapering diameter.  However, I am unable to create a coil with a taper and a changing pitch at the same time.

We are using Inventor 2013. I would like to produce similar parts as the attached 2D drawings in 3D, only with a changing pitch (distance between revolutions) per revolution.  Can it be done?  There is software for the CNC spring manufacturing machines to produce such parts. Therefore the proper inputs to produce these effectively and efficiently, are available somewhere.

The part I've been describing uses .09 diameter wire and has about 54 coils in about 8 inches. The starting inside diameter is about .53" and the pitch is about .27" the ending inside diameter is .109" +/- .01 with a pitch of about .091".

Here are 2D drawings of similar parts, the last (NF3) is closest to what we need.

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[URL].....

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