ATM 21" f/6 - Rough Grinding

["Thomas A Simmons" <tasimmons@west.raytheon.com>]

Hi Ken,
you wrote (in part)

>Date: Wed, 9 Aug 2000 08:06:41 -0600
>From: "Ken Bertapelle" <kenb@cqg.com>
>Subject: ATM 21" f/6 - Rough Grinding

>>SNIP<<

>  - Tried making a grinding tool with the "glue less" method described by
>Richard Scwartz, but this didn't work out for me.  The plaster oozes in
>between the tiles, and it was too difficult to open up the lines between
the
>tiles again.

 Is it possible you let the plaster cure too long before you tried to clean
the gaps? I recently copied Richard's method, and let the tool cure for ~10
minutes after pouring (POP/Quikcrete mix), peeled the plastic dam away,
flipped the tool over, and then easily cleaned the gaps with a putty knife
and scrub brush. Richard suggested using a sharpening stone to clear the
gaps, but this worked. I had one low tile (one tile took a little longer to
clear the sharpie marks).