I've found that a couple of quick shots of router-bit lubricant into the hollow chisel of my benchtop mortising machine eliminates the annoying squeal I used to get with those bits.

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I've found that a couple of quick shots of router-bit lubricant into the hollow chisel of my benchtop mortising machine eliminates the annoying squeal I used to get with those bits. It only takes a little spritz, and I wipe off the excess before use to prevent it from contaminating my workpiece. As a bonus, I've found the bit stays cool longer and cuts quicker and cleaner.
—Tony Strother, Durham, N.C.