There are many ways to do this and one of the most popular ways is to use a shop bought lubricant. However a cheaper way to keep your hole saw cool is to get a household sponge and cut it to the size of your holes saw. Soak the sponge in water and place it inside the hole saw threading it onto the pilot drill. As you use the hole saw the water will trickle down the sides of the hole saw helping to clear chips and disperse heat and improving the life of your hole saw.
Running your hole saw at the correct speed again will dramatically increase the life of your hole saw.
The speed the hole saw needs to be run at depends on the diameter of the saw and on the material you wish to cut.
Many people believe that you need to run your hole saw faster through stainless steel. However the very opposite is true. Slow steady speed with gentle pressure is the answer.
For example a 20mm Morse hole saw cutting wood or mild steel should be run at 425rpm but the same hole saw going through stainless steel should be run at 210rpm.
The speeds for most of the common materials can be found on the side of a Morse hole saw box.
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