Diamond Drilling | The Gem Shop, Inc.
I have found that using the slowest recommended speed is best, (that heat factor). As an example, The Gem Shop, has a drill press with the top speed being 3600 RPM. The bits we use from Chrystallite recommend 5000 to 20,000 RPM for this bit. The top setting on the drill press works fine. Slower drilling is much better for controlling the ...