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Your diamond drill bits lifetime will depend on certain factors: speed, lubricant, pressure and the density of the material you’re using .

If you smell burning, back off! You’re speed is too high or the pressure you’re applying is too much. You’re drill bit should never be hot to the touch, not even warm. Start your speed off slow and increase as the drill bit goes through your material too higher speed will cause the drill bit to overheat and your material to crack. If the diamonds chip away from the shaft it is probably due to too much pressure – let the drill do the work and apply very little pressure. Feel your way through your material. If in doubt, practice on a garden pebble until you get used to the technique. The general rule is the smaller the diameter of your drill bit, the faster you can go. However, the harder your material the slower you should go.

Take a look at teacher and jewellery artist, Melissa Muir’s video at the bottom of this page as she shows how to correctly use speed with your drills.