Re: ATM mirrorbox not exactly square

["Frédéric Géa" <GEAF@CSI.COM>]

Hi Jan,

1 mm ? you mean 1/10th of a centimeter ? So big ? :))  Don't worry,
absolutely no problem for a 20 inc dob, it's a good accuracy. Their is
probably not a lot of dob around which have so square a box.

Frederic
http://www.astrosurf.org/jupiter/altaz/index.htm#index


-----Message d'origine-----
De : Jan van Gastel <jhm.van.gastel@mdw.vu.nl>
À : ATM <atm@shore.net>
Date : mardi 1 août 2000 12:24
Objet : ATM mirrorbox not exactly square


>
>
>Today I glued the mirrorbox of the 20" together. Kriege and Berry make a
>hard point of making it exactly square. I tried to do so, but due to the
>tailgate (which isn't 100% square) the box isn't exactly square. The
>difference is 1 mm (.04inch) over a length of 650 mm on two of the four
>sides, visible when I place the box on an exactly square table. This is
>about 0.15% error per side. I glued the box araound the tailgate, which
fits
>in it very good and tight this way. I don't think this error will
>give any problems. Or do I overlook something?
>
>
>Jan
>http://www.geocities.com/janvangastel/
>
>Jan van Gastel
>http://www.geocities.com/janvangastel/
>
>