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Hi Guys and Gals. Need some advise. I do some glass engraving, about 5 pieces a week along with much more standard drag engraving on metal. The glass is moulded 'crystal' glass as well as Lead Crystal (harder and Softer respectively). Recently ive noticed a slight deterioration in the cut quality and assumed the cutter (11/64 .003 faceted Diamond Tip) was on its way out, while I made adjustments the tip failed completely.....wouldn't cut into the glass at all. Having replaced the tip with a brand new tip from J&M Diamond in the States. This tip has lasted for literally afew glass jobs and its dead.... won't penetrate the glass. I used Pledge Furniture polish previously as a coolant, but its messy and ive not been convinced for awhile how good it is.....its what the previous engraver used....But have recently tried upgrading to Mastergraves Glass Engraving oil and have only used that with the new Tip. The previous engraver has a stash of dead tips, all faceted 11/64 .003 Glass (and one dead drag tip ) which suggests I am/ we were doing something fundamentally wrong and probably to do with heat/lack of cooling. My general engraving setup for glass is as follows - Machine - Suregrave Rotation S Speed - 17500 RPM Tips - 11/64 .003 faceted Diamond Coolant - Pledge Furniture polish/ Master Grave Glass Engraving Oil Any Ideas on how I can reduce my attrition on Cutting tips when engraving glass and where I might be going wrong in my set-up please. Kind Regards, John