[ATM] Sun Test During Rough Grinding

[Jeremy Royston]

Hello all,
	It may have been mentioned previously. What about the flashlight
test? You don't need any large equipment like the sun or clear weather, or
to make a template, or a spherometer

Jerry 

-----Ursprüngliche Nachricht-----
Von: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] Im Auftrag von
Anish Mangal
Gesendet: 08 April 2010 10:42
An: Berthold Hamburger
Cc: ATM List
Betreff: Re: [ATM] Sun Test During Rough Grinding

Hi Joe,

I for one used two methods to perform measurements during rough grinding

1. [Rough estimate] Use a feeler gauge to measure sagitta
2. [Rough though more accurate] Sun test as being discussed here

The first test was pretty convenient in the initial stages during rough
grinding as one doesn't have to wet the mirror and go out in the sun and
measure (time consuming)

Clear skies!
-Anish
New Delhi, India