What is thermal drilling: Purpose & Advantages, how it is done. Formdrills perforate thin metals using friction. They form holes and push through a bushing from the displaced material that is normally cut. These bushings can be tapped to avoid the use of welded nuts or inserts. Can be used in drill presses or CNC systems. Saves labor, time and materials. David Claudio, North American Operations Director, Formdrill USA, Inc.