RE: [ATM] Pit Stop (Pun) - Newbie needs advice.

["David Grennan" <dave@webtreatz.com>]

Tom(s) and Bob thanks for all your wise words.  After examining the pits and
comparing them to the grains of 120 alox, I've come to the conclusion its
time to move on.  It has become clear that all I am achieving with further
wets is moving the pits around.  I think its just a case of realising that
I'm not making the mirror for the JWT here, just a lil 8'inch to take some
pretty snaps thru:)  Also I think I may have been applying a little too much
pressure and causing minute fractures instead of clean cut pits.  A few wets
with almost zero pressure seems to have gotten rid of almost all of the
pits.

Boy this is one hell of a learning curve, and man am I glad to be on it!!!

Clear skies,

Dave.

> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf
> Of Thomas A Simmons
> Sent: 02 February 2005 20:17
> To: atm@atmlist.net
> Subject: [ATM] Pit Stop (Pun) - Newbie needs advice.
>
>
>
>
>
>
> Dave,
>
>   Short answer? you could probably move on. but....
>
> Why not learn some skills while you're here? You'll need it anyway.
>
> Whatever you are using to look at the pits-a small microscope, a loupe,
> an eyepiece-take a few of those 120 grains and nudge them next to one of
> your pits. Is the pit about the same size, or very much bigger? If
> about the same size-move on. but wait.....
>
> If you don't already have one-go buy a marker called a "sharpie". Now
> dab those miscreant pits with the marker and do a short wet. Did the marks
> disappear? Yes-move on. No?-well now, aren't you glad you waited?
> If you're
> out of 120 grit, you can probably get them in 180 grit, but you'll have to
> work a little smarter.
>
> Don't get rid of the sharpie. You'll want it after a couple wets of 180.
>
> BTW, get a notepad or keep track of what you're doing on the 'puter.
> It's a good habit to get into now, and it'll become REAL important later.
>
> Tom
> Tucson, AZ
>
>
> Date: Wed, 2 Feb 2005 18:32:22 -0000
> From: "David Grennan" <dave@webtreatz.com>
> Subject: [ATM] Pit Stop (Pun) - Newbie needs advice.
> To: "ATM List" <atm@atmlist.net>
> Message-ID: <BLENIIPNLIFOCLPAGJHOMEBPCIAA.dave@webtreatz.com>
> Content-Type: text/plain;            charset="iso-8859-1"
>
> Hi All,  I'm new to this group and really enjoying reading all of the
> fascinating threads.
>
> I'm currently working on making my own 8inch f/6 mirror.  I've done the
> rough grinding with #80carbo and am now working with 120 Alox using the
> 'normal' stroke described by texereau.  Problem is this.  I've almost used
> up all of the 120alox that came with my kit yet despite this I can still
> see
> lots of pits larger than the average.  I've done about 20 wets.  My
> question
> is this, should I move on and forget about these as they'll probably get
> removed as I work with the finer grades or should I persist until every
> last
> one of these larger pits is gone?
>
> I assume the effect of a couple of pits on the final mirror will be
> negligable anyway?
>
> Thanks in advance for your advice.
>
> Regards,
>
> Dave Grennan
>
> _______________________________________________
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