I’m removing less than half of the round shaped bur. But just stopping short of removing the curvature or shape of the Cabochon stone. This is quite a delicate process, and it does take some practice.
REMEMBER, keep rotating bur and keeping it ‘cool to your touch’ if it changes colour to brown or black, you’ve burned the bur.!!!
If this happens, the bur steel is now softened and it won’t be useful for long durations.
Have a little jar of water nearby and immerse your bur into your water, as often as you can. If it’s getting hot, stop and keep it cool to your finger…Gerry Lewy!