Drill speed

[twisted]

1) granite counter top, 3mm thick, 1.5 in core bit, with water.  what drill speed should I use to maxamize bit life.
2) will "ager" fill in light/small sctraches on the counter surface? 

[Mark D.]

What bit is it?

Have you tried calling the manufacturer of the bit?

Generally speaking, slower speed are better as the physics involved make the metal bond react like the bond is harder when a bit is run at high speeds.

I am sorry I can't tell you more at this time. Can you provide me with more information?
Mark