FW: [ATM] make ronchi grating

[saundby at foothill.net (Mark Graybill)]

I made my own Ronchi grating from the postscript code, it worked great. I used 
100 lpi since it was a simple multiple of my printer's resolution. I printed 
two pieces out onto transparency "paper." I cut one out for the Foucault 
tester, and cut the other out to fit inside the cap of a film can. That goes 
onto a film can with the bottom cut out. That gives me a Ronchi grating I can 
pop into a focuser to use on a fully assembled scope.

-Mark G.

On Monday 26 January 2004 01:20 pm, mlbrown@everstrive.com wrote:
> Naw, make your own:
>
> Search the archives (http://astro.umsystem.edu/atm/search.html) for "make
> ronchi grating" and you get (amongst many):
>
> http://astro.umsystem.edu/atm/ARCHIVES/JUN97/msg00266.html
>
> For postscript code you can use to print your own gratings on
> transparencies.  Works a treat for me.  I use 133 lpi.
>
> If you look thru the archives, you'll also see several ways to make your
> own, wrapping fine wire or monofilament around a simple frame.
>
> Also try to Google "make ronchi grating" and you'll find:
>
> http://telescopemaking.org/ronchi.html
>
> =Matt
>
> Original Message:
> -----------------
> From: c f quantemlp@hotmail.com
> Date: Mon, 26 Jan 2004 21:07:11 +0000
> 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
>
> _________________________________________________________________
> Scope out the new MSN Plus Internet Software ? optimizes dial-up to the
> max!
>    http://join.msn.com/?pgmarket=en-us&page=byoa/plus&ST=1
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>
>
> --------------------------------------------------------------------
> mail2web - Check your email from the web at
> http://mail2web.com/ .
>
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/