[ATM] ronchi grating

[mbyorick at starband.net (mbyorick)]

 Willman-Bell (www.willbell.com) sells Ronchi grating replicas for $3.50
apiece...  Edmund Scientific also sells relatively cheap gratings, I
believe.

MikeB
SW New Mexico

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
Of c f
Sent: Monday, January 26, 2004 2:07 PM
To: atm@atmlist.net
Subject: [ATM] ronchi grating

Hello to all,

I have started to polish my mirror, and I have built my knife
edge/ronchi 
tester.  the only thing I am missing is the ronchi grate.  I have seen
in 
the atm boards that this has been bought at orion, and edmonds,  I
checked 
edmonds and they wanted $37 for it,  and newport glass wanted over $20
for 
thiers also.  but the prices I have seen on the boards are all around
$6.  
is it possible to make this grating with the computer with success?  or
is 
there a web site that I can order this from.  I have ordered the orion 
catalog and will check in there also when it comes in.  I can do the
knife 
edge test and wire test with no issues, but I would like to follow up
with 
the ronchi.  If anybody has any knowledge of where I can get this
grating 
please let me know.  If there is a way to make it and have it done 
correctly, please let me know also.

clear skys to all

charles in wilmington

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