Re: ATM Those da.... grinding tools again

[astillma@nit.AirTouch.COM (Anthony Stillman)]

Frode wrote:
...
        - Is it of great importance that the tool is of exactly same
          diameter as the blank?

        - Is it better to glue the tiles to the gypsum plate with epoxy 
          than with gymsum? Anyway I know that I have to coat the
          gypum plate with something.

        - The floor tile I have is big and should cover the whole tool.
          Should I cut the tile in small squares or just glue the thing to
          the plate? Or is it better to get some squares of plate glass?   
...

The tool does not have to be "exactly" the same size, but the closer the better 
in terms of interpreting the advice you will get on strokes.  Sub-diameter tools
are used all the time and it changes the way you work.  I don't suggest this 
for a first mirror.  Over-sized tools, why? OK maybe for flats, but I don't 
grind flats.

I use epoxy to adhere tile.  I use to use Duco cement, it didn't work that well.

Solid tools may have some advantages over segmented composite tools, but I can't
think of any.  A solid composite tool sounds like the worst of both worlds.  
Break the tile up.  I vaguely recall a random tile tool I saw at least a decade
ago, probably longer.  I don't know if it worked.  It was made of broken 
tile bits about the same size and assemblied with sort of equal spacing.  Now
that it comes to mind, I may try it.

Good Luck
Anthony