Drilling is a cutting process that uses a drill bit, a rotary cutting tool, to cut or enlarge a hole of circular cross-section in solid materials .  The bit is pressed against the workpiece and rotated at rates from hundreds to thousands of revolutions per minute, cutting off chips (swarf) from the hole as it is drilled. 

Drilling process can either be spot drilling, center drilling, deep-hole drilling (gun or trepanning), microdrilling, vibration drilling, orbital drilling (circle interpolating), or laser drilling.

vCalc's Drilling library consists of computations involved in the drilling processes.