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----- Original Message ----- From: "Arthur Entlich" <email@example.com> To: <firstname.lastname@example.org> Sent: Sunday, April 28, 2002 3:13 AM Subject: Re: scanner glass replacement > Where are there good sources for such glass? Do most glass suppliers > carry it, or is it only available from certain facilities? Is it made > to order for scanner companies, or is it a generic glass they simply > order? About how much is it a square foot, or is it only sold in set > sizes? Does it vary in thickness? Is there a standard thickness used > for most letter and legal sized scanners? I did some searches on the web as I intend to make a DIY glass carrier for the Nikon 8000 based on a non glass carrier (ordered it 2 weeks ago but it takes time). There's an English version on this website of a German optical glass distributor; http://www.optische-komponenten.de/intl/index.html I think for most flatbed scanners the optical glass quality falls in the category 'selected white float glass'. Above that is the same glass but with an extra polishing on both sides. With float glass the side that was in touch with the molten tin is the most plane side, the flame polished upside can show some irregularities like stria. The usual faults are bubbles in the glass and tiny parts of tin that stick to the underside, the last show up as tiny mirrors. For the sizes of flatbed scanners it should be possible to find good pieces at a local glass shop I guess. Flatness and an even thickness can hardly be a problem. Ask them to cut more sheets carefully, the price can't be a problem. Handling afterwards and polishing the edges is more of a problem. Then select the best on close inspection. What surprised me is that float glass in larger sizes doesn't have to be plane entirely. One would expect that the tinbed method always creates a planeness equal to the worlds radius. Changes in the weigth of the glass within the machines production size can create differences though. Not important for scanner glass. Ernst - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.