Re: [ATM] Manufacture lens

["Bob May" <bobmay@nethere.com>]

There is also the Newport Glass Works website.  Wedge is
basically measured by measuing the thickness of a point just
inside the edge of the glass disk.
This is easily done by supporting the disk at 3 points and
locating the disk on those 3 points with 2 more pins that bear
against the side of the disk and on either side of one of the 3
points.  The thickness of the glass is measured at the support
pin between the two side locating pins with some measuring tool.
Often used is a dial indicator.  The absolute thickness isn't
important but rather the relaitive tjhickness of several points
around the disk.
You will also need a thickness measuring tool which is a support
point in the middle of the disk with several points which can be
adjusted tp hold the disk level with a measuring tool over the
center support point.  The measuring tool is zeroed on the
support point and then the disk put between.
A spherometer is also a good tool to have, especially for
measuring convex surfaces.  There are several designs of these.
Bob May
bobmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net
Replace the obvious words with the proper character.

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