Re[2]: ATM [Fwd: BOUNCE atm@shore.net: Non-member submission from ["R R" <wjkkr@hotmail.com>]]

[Dwight Elvey <elvey@hal.com>]

"Chuck Hovatter" <charleshovatter@acelink.net> wrote:
> 
> 
> 
> >> From: "R R" <wjkkr@hotmail.com>
> >> To: atm@shore.net
> >>
> >> I have been given an 8" mirror that has been aluminized but probably
> >> shouldn't have been.  The surface shows a large number of pits & some
> >> scratches still (I understand aluminizing will bring this out). I do not
> >> have the tool for the mirror.  The mirror seems to be able to form a
> >> decent image at focus, although I have not Focault tested it.  The
> >> question is, should I either try to remove the aluminum coating,
> >> repolish & with what, or pitch the mirror, or mount??
> 
> 
> What pleases you?   Does it give a good image?   If not then you will most
> likely have to go back to grinding - 120-220 grit if you don't have the tool.
> You can make a plaster tool with tiles; the archives are full of them.   No
> need
> to remove the coating; It will come off when you work the mirror.
> Good luck,
> -Chuck

Hi
 No, wait, Wait! A few minor pits and scratches are almost
always present. Most recomemend using a black marker to
dot the pits. I'm not sure this would be as good for the
scratches. Unless there is troubles with off axis glare,
I'd just leave them. Coating a mirror will bring out any
surface flaws that were hard to see when just polished.
Check it with a tester first, if it is good, it would
need a lot of flaws to convince me to regrind. If the
scratches were small, just making a lap and polishing
might be in order if the figure was off.
Dwight