Help please

You need to have water. Make a dam out of clay around the spot you want to drill and fill it with about 1/4" of water. you also need to raise the rpm's of the drill to around 3500. Use a little bit of pressure at a time and not all at once. Drill, lift...drill, lift....take your time. those bits aren't the easiest to drill a hole with. You might want to think about taking the mirror to a glass shop and having them do it.

Andy

Indeed, the cost for a merchant to drill holes might be around $3 ea, much less than new mirror glass : ( Of course, if you want to drill holes reasonably often, it might be worth gearing up with a water fed chuck and diamond drill(s) as required. Of course, you also need to modify a water collection point on the drill press and drainage etc if using inside a building, and a horizontal glass bed as large as needed for the size is also a high priority. goo take a look at a glass merchants setup if you can. With diamond core bits, you'd mark the back of the glass, drill half to 2/3 the way through, then drill from face side through to link them up, otherwise shelling is going to occur. Regards, Les

I sure hope you are wearing some personal safety gear if you are planning on continuing this "technique"!!!!

what size holes and what thickness of glass. I drill around 1,000 yes I said 1k holes per month!! all of my fused glass windchimes, dichroic jewelry and large glass panels are drilled.