back ring ellipsoid g-code

<p>The g-code has a curve programmed in for the tool path to follow. The tool gets progressively closer to the finished curve with each pass.</p> <p>I used the same routine as for the front section ellipsoid, but I shouldn&#39;t have since the back is not meant to be an ellipse. I fudged it by changing the parameters of the ellipse to create the main part of the curvature at the extremity, i.e. a low height ellipse. In future I should do a separate routine for this cut. Yeah lazy bones, I should listen to myself!</p>

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