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Message: <blockquote data-quote="easysat" data-source="post: 26799" data-attributes="member: 175305">I read elsewhere that the tolerance on the dish surface needs to be better than a tenth of a wavelength, so the error must be less than 2.5mm. Assuming the quality is good, I guess the pieces must be manufactured to maybe ten times better than this or 0.25mm (or 10 thou for the non-metricated). So I see what you mean when you say that the accuracy of the assembly makes a big difference.Out of interest, do they have some sort of system for accurately aligning the different petals or do you do it by eye? I would have thought that you would need at least some sort of precision reference hole that aligns with a matching pin on the next petal to guarantee anything like the accuracy required.</blockquote>