ATM Rough grinding on tiled tool!!

[arning@itn.is (Arni Ingimundarson)]

First... Thanx to all who have answered my previos questions :)


Last night, and continued to day, I started grinding my 8" F/8 mirror.  I 
have the W-B kit and have built a tiled tool (on plywood, seeled and 
embeded whith resin).  After grinding aprox. for 4 hours and half of the 
no.60 grit is gone, I only have about 0,5 mm hole (sagitta is called?).

Is this normal to use so much grit?

And how much water should I use.  I feel as I am doing something wrong.  
Oh yeah.. I am gringing on a grinding machine by hand on the coars grit 
as recomended by Tom.  It turnes about 12-13 rpm (is that to much?).

How much presure should I apply??

A good, detailed, description on grinding on tiled tools (as it is not 
mentioned in the books I have, ATM part 1-3, 1972 printing), would be 
greatly, greatly appreciated.

Thanx,

Arni Ingimundarson
arning@itn.is
Electronics Technician
Amateur Telescope Builder :)
Iceland.