[ATM] Fw: Re Time to take a BATH

[Peter De Baan]

It is just becomes a 4 toothed wheel
Peter > From: stainless_steel at suddenlink.net> To: funnybone101 at embarqmail.com; atm at atmlist.net> Date: Mon, 4 Aug 2008 14:21:16 -0500> Subject: Re: [ATM] Fw: Re Time to take a BATH> > Mitch,> > WHAT PREVENTS A WHEEL FROM BEING SQUARE?> > R-101> > > ----- Original Message ----- > From: "Mitchell R" <funnybone101 at embarqmail.com>> To: <atm at atmlist.net>> Sent: Monday, August 04, 2008 2:05 PM> Subject: Re: [ATM] Fw: Re Time to take a BATH> > > >> > "WHAT PREVENTS YOU TO CHANGE FROM FOUCAULT TO INTERFEROMETRIC> > TESTING?"> >> > XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX> >> > A Good question:> >> > 1. Foucault is a time tested method that in the hands of a good operator,> > knowing the tests limitations, can help produce an excellent mirror.> >> > 2. People are quick to judge and slow to change. Either they dismiss> > interferometery from rumors that it is not good, or see no reason to > > change> > what isn't broken (Foucault).> >> > 3. There are many books and plans on making and using Foucault and making> > Foucault testers. While the internet is making this easier for> > Interferometer testing, it will still take time.> >> > 5. There are many programs to reduce Foucault readings, and fewer for> > Interferometers.> >> > 6. A lack of understanding, many people understand the basics of Foucault> > but perhaps Interferometers scare them away, even if they once understood,> > are very simple.> >> > Those are just a few things which mostly follow under the quick to judge > > but> > slow to change type philosophy.> >> > The same question applies to Auto Collimation testing. Similar to Foucault> > and all you need to do is add a flat. The flat needs to be very smooth > > with> > no zones or edge problems but can be out of true flat by many waves.> >> > The test is twice as sensitive as Foucault and also a null test for a> > parabola making it extremely easy to use with a ronchi grating or knife> > edge. There are no readings, masks, reducing of data. Just go for straight> > lines, yet why hasn't everyone switched to this? Some people are, and I > > will> > be one of them when I can find a good sized, very smooth, and cored out> > flat.> >> > Mitchell> >> >> >> >> >> > _______________________________________________> > ATM mailing list http://www.atmlist.net/> > > > > _______________________________________________> ATM mailing list http://www.atmlist.net/
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