Forget centre drills, they are a throwback to earlier days and were designed for putting in the support holes for centres on lathes, hence the name.

No commercial CNC shop would dream of using centre drills today, instead using what are called NC spotting drills.

These are very stiff short fluted drills that will start a hole off without wander and not break like the flimsy centre drills.

Nearly the same results can be obtained using a good quality stub drill.

John S.