Help with Glass

[keithorr]

I drill holes from time to time. Here is a video of one setup. I always use a drill press and diamond core drills with tap water.

http://www.keithorrblowpipes.com/ima...dDrill1500.wmv

[planar39]

wow neat question, i dont think its a question of lubricant efficiancy, i would reccomend that you have a sturdy setup, and your on center of the bottle (assuming your side drilling) then... its a matter of the drill type your using.

not having drilled glass, i have drilled glass filled phenolics, kinda like fiberglass. In those situations, heat was generated quickley, so id advise pecking often and constant coolant.(carbide drill! was needed) hmm i might have to try this on break.

ps fiberglass is a bear to grind, so i imagine quite a bit of trouble but not sure how much,

again as usual, im probably no help

[mermaid1015]

You underestimate yourself. Your recommendations are similar to those I've gotten from several others. I haven't gotten anything done since I originally posted. Well that's not true. I did do one bottle successfully. I was having trouble with the heat and with a small amount of flaking. Hopefully I'll be feeling up to it in a few days. I'm trying to figure out how to protect my drill press from the lubricant and coolant. I'd hate to tear it up this early in the game!!

Thanks for taking the time to give me your advise. I really do appreciate it.

Sincerely,
mermaid

[Laser_Items]

Newbie here... I am drilling a 1/2 hole in a hollow glass cube (the type used in walls of buildings), the thickness to cut is about .3 and I am doing it on a CNC vertical with water based coolant. I have to drill about .75 to get the full diameter due to the angle of the bit. Right now I use 700rpm and about .5 in/min, I am wondering if anyone has specific speeds and feeds for normal glass, and will rpm and feed causing shattering, and would pecking be recommended?

Any help would be greatly appreciated.

Thanks in advance.

Laser_Items