Re: [multimachine] Re: making flat surfaces?
To add to Ian's comment, rotating the plates lets you make spherical section lenses...On Jan 7, 2013 11:16 PM, "Ian Newman" <ian_new@...> wrote:
Hi Mr Hulk,
You are correct in your reasons for making surface plates in threes. If made as a pair one plate ends up domed and the other with a depression - rotating the plates only makes this situation worse.
All the best,
--- On Mon, 7/1/13, rampaginggreenhulk <rampaginggreenhulk@...> wrote:
From: rampaginggreenhulk <rampaginggreenhulk@...>
Subject: [multimachine] Re: making flat surfaces?
Date: Monday, 7 January, 2013, 21:47
actually I've read in a Gingery book that plate glass should be used. For what it's worth.
The reason for the 3rd plate is to elimate the possibility (perhaps likelihood) of a concave/convex condition developing if only 2 plates were used. If you were creating square plates though, I can't see why only 2 plates could be used, but rotating one 90 degrees ever 3rd lap/scrape.