Viewports

09/12/07

And the first one is done.  There is no tolerance mentioned on the plans but, the  machine I am using is very accurate and so I was able to machine this to a tolerance of pretty much +/- 0.  I machined the depth of the lens bore to be 1.25 inches exactly, so the retaining plate should fit against it to bolt it down.  The inside diameter of 8 inches I machined + 0.5 mm.  In other words, there is half a millimeter clearance around the lens.  I don’t know how accurate the lenses will be when I get them.  So I’m assuming they will be exactly 8”.  If they are, they should fit perfectly.   I won’t be able to adjust anything once these are fitted, so I hope this is correct.

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