I need to bore a pulley to fit on a motor. The motor shaft is exactly .5". Question, what size should I bore the the pulley ID for best results? Maybe .002 smaller?

Thanks in advance, Bill

Boring 0.002" smaller is too small. For motor pulleys go for a size-for-size fit or slightly larger; i.e., bore 0.500" -0.000" +0.001".

Boring 0.002" smaller would make it impossible to get the pulley on without heating it and shrinking it on....then you would never get it off!!!