Glass should be drilled with a cutting lubricant. An oil-based lubricant is best. We recommend Handi Bits Foam Cutting & Drilling Lubricant. Water can be used, but not recommended. Make a small reservoir out of a piece of string or bit of clay to hold lubricant around drilling area. Drill pilot hole if possible, you will get better results for your efforts. Never apply excessive pressure to glass. Be sure you are drilling on a flat surface and do not let the body of the drill (not drill bit) slide into and hit the glass when the bit exits the hole. Glass should be drilled at speeds of 300 - 600 RPM. NO FASTER! Remember friction creates heat - the enemy when drilling glass.

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These materials should be drilled using a slow slow to moderate speeds. A hammer action drill should not be used because it will cause chipping or cracking. A piece of tape placed over the drilling area will help to prevent chipping and cracking.

Drill at a speed comparable to a typical masonry bit. Expect longer life and quicker cutting with Bad Dog Bits. Should you need a special size of bit for this application, we manufacture Bad Dog Bits up to 24" long and 1-1/2" in diameter. Contact us at 1-800-252-1330 for more information and pricing. Core bits, cruciform bits, spline shank bits, and chisel bits are also available.

Large Hole

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Metals should be drilled at high speeds not less than 2,000 RPM. Because Bad Dog Bits file through materials, rather than drill, you will find they do not drill as quickly as a traditional twist drill bit. However Bad Dog Bits will drill much harder metals (like tempered and high-speed steel) than a twist drill. Whenever possible, use a drill press when drilling metal.