I have used a spade bit as well, drilling up to 1 1/4" diameter, for making my bearing mounting blocks. I had to take it slow and just kept spraying it with WD40 (didn't have an real cutting oil) as I am using a cheapie drill press but it got the job done and it turned out surprisingly well. I have also used a 30mm forstner bit but that is really had on my drill press, the pulley belts were smoking by the time I got done. Thank goodness I only have one more of those to drill. |