At work today I had to remove a some knobs from cabinet doors. The screw heads were a mess so I decided to drill them out. I carry a set of Heller cobalt drill bits in my ruck sack but the size I wanted I used the week before to drill out about 8 decking screws and noticed that on screw number 8 it had slowed massively.
Today I used a TCT bit.
I appreciate that the machine screws used for the knobs are less hard than the decking screws but is there a reason for not automatically resorting to a TCT drill bit whenever drilling through metal?
My experience of drilling through metals is very limited. I did work as a lift engineers mate over 30 years ago (for 6 months). We mainly drilled through mild steel using HSS jobbers which were treated as disposable.
Today I used a TCT bit.
I appreciate that the machine screws used for the knobs are less hard than the decking screws but is there a reason for not automatically resorting to a TCT drill bit whenever drilling through metal?
My experience of drilling through metals is very limited. I did work as a lift engineers mate over 30 years ago (for 6 months). We mainly drilled through mild steel using HSS jobbers which were treated as disposable.