For those of you looking to create watchbands or cases for the Apple Watch, they've released the CAD drawings for both the 38mm and 42mm versions. And boy they are a doozy.
They're filled with "keepouts" warning would-be accessories designers which parts oughtn't be obstructed, to maintain functionality.
To us CAD-reading ID'ers the drawings provide glimpses of numbers we could only have guessed at. Like the corner details:
You didn't think that those were all one radius, did you?
Or the bottom of the side profile?
While the drawings are provided black-on-white…
…Yeah, we inversed them, for no reason other than that they look cool.
You'll find the CAD drawings here, embedded within the PDF.
I was always told by the engineers to measure from a datum point. Are these the actual manufacturing drawings or are the simply a guide for after market manufacturers?.
So, why did Apple go through all the trouble of marking down control points for a spline instead of just giving us the end points and rho value for a conic? It'd have cleaned up the drawing markedly.
Those are probably not conics but splines or even better NURBS curves. You can repersent a correct conic curve with a rational bezier curve of degree 2 but you need higher degree to obtain good cuvature continuity and an aesthetically pleasing connection with the straight line. Also I suspect they just dimensioned points on the curve measured at a regular interval, in a way that every interpolation you could build on them will have a desired error with respect to the actual curve used. It's a common practice in optical design for example.
I agree, it's very frustrating.
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