Re: ATM SiC or AlO

[Anthony Stillman <atmer@flash.net>]

>What is the reason for switching to AlO in finer steps instead
>of using SiC to the last step.


Vladimir,

For me, the reason is simple, avalibility.

Also, just to push Richard and Mutalib's button, I've always used AlO for
fine grinding and therefore it's the ONLY way it can be done.


>I think that 1200 SiC equals 5 micrometers of AlO.

I stopped trying to figure out the conversion years ago.  Somewhere I have
a chart showing the equivalences.  Someone else will likely post it long
before I even find the correct mess to look through.  For large glass, my
grit sequence is:  80, 120, 320, 400, 600, 17u or 15u, 9u, 5u, 3u.  I like
to go to 3u as it shortens the polishing time.  Though, I do need to be
careful about scratches at 3u.


>...I have got AlO an wander if I should regrind with AlO...

I didn't, uh, I mean I wouldn't.


Anthony