Well I've just passed 65hours of total time with my blank!!!I've currently done 5h 45 minutes with the tile tool and I'm back down from 12.5mm to about 11mm so realistically I could have just ground to about 11mm before starting with the tile but you live you learn.currently I'm edge deepening with the tile tool to get it back to about 10.5mm before I move onto the next grit.I'm going to have the mirror checked out again this weekend to make sure I'm not ruining it with my ham fists and basically to see how far off a sphere I am.
As I said before,I'm moving at the end if the month but our house fell through so after another couple of weeks I may have to have a month off the mirror as I will have nowhere to grind.Just Aslong as I'm ready for the pitch lap by then I will be happy enough with the break.
Frighteningly I've gone through 12.5kg of 80 grit and 25kg if 60 grit to get to this stage!!!I wasted a lot of grit to start with but I'm currently reusing grit that I've recouped and cleaned so I won't need to buy anymore.I did buy an extra 3.5kg of 80 but hopefully won't need it.
It's now about 3 months since I looked through the eyepiece of a scope so hopefully by the time autumn comes I will be geared up and ready to hammer those galaxies!!!
Clear skies Rich