[ATM] Will Alum Oxide fine grind quartz blank?

[Mark Cowan]

Oops, brain lock-

My progression is 500 SiC, 25 micron Al2O3, 12 micron Al2O3.  I don't find any advantage to going to finer grades, and they are the WCA 25T and 12T.

Best,
Mark

--- On Wed, 10/7/09, Mark Cowan <toolontop at yahoo.com> wrote:

> From: Mark Cowan <toolontop at yahoo.com>
> Subject: Re: [ATM] Will Alum Oxide fine grind quartz blank?
> To: atm at atmlist.net
> Date: Wednesday, October 7, 2009, 9:30 PM
> Al2O3 is only a little harder than
> SiO2 and it will grind it, but very slowly.  For quartz
> I use SiC through 500 grit and then switch to the (similar
> size) 25 micron aluminum oxide and finish with 15 micron
> before polishing.