Draker
Well Known Member
Are there guidelines about the correct RPM speed to use when drilling aluminum with a step bit (unibit)? Reading threads here I?ve seen both ?use high RPM? and ?use low RPM? recommendations. I ask because I?ve had mixed success with this tool in the past, using a drill press to drill the conduit holes in the wing ribs. I?ll be drilling through the main center section soon and want to do it right. Also, lubrication or no lubrication? High or low drilling pressure?