http://www.forrestrace.com/bits-hole/
Can someone tell me the proper drill-bit type to make a hole in pottery?
Ive been using larger masonry bits to make drainage holes in heavy ceramic pottery (which has no holes in it); sometimes I’m sitting on the drill for 5 minutes before it even makes the smallest hole. I can swear I did this a few years with much better ease – but, I have no idea what type of drill bit I used. Not trying to drill thru terra-cotta or anything like that – but, like heavy ceramic – such as what a heavy coffee mug or hefty soup bowl would be like. Thats what Im trying to plant some funky bulb plants into and I must have good drainage? Any ideas???
http://www.naturalhandyman.com/qa/qadrilling.shtm
Above sight goes in depth on your question. You need a special ceramic tile/glass cutting drill bit which is a different shape and higher strength than carbide types. Ceramic surface is one of the toughest to drill through and you cannot use pressure. Recommends you tape the surface first and then slowly drill, removing material as you go.
Milwaukee Hole Saw Selfeed Bit Demo
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