I have occasions where I need to drill as many as 80 half-inch deep 9/16′ diameter holes into a hardwood fixture, for which I use a Forstner bit. After the first few holes, the heat buildup is great enough that there is the possibility of burning both the bit and the stock. I find that a 6-10 second blast of compressed air on the bit from my blower nozzle after each hole keeps the bit cool enough that the job can be completed without damaging the bit or burning the wood.
– Rich Forbes
Ocala, FL
