...When drilling polycarbonate, PETG, plexiglass etc, a fluted drill bit can catch into the plastic and either quickly be sucked into the hole, chip the plastic or worse, crack it out from the hole.
Over the many years of fabricating machinery guards and other around the house and motorcycle plastic fabricating, I've gotten very used to using stepped drills. ...
I always thought steppped drills meant working your way up the drill pack to enlarge a pilot hole - consider me now more educated!
PS: great thread - just ordered my screen last night.
