Drill bits

Toneyz · Aug 22, 2019

Is it me or when you have used a drill bit (especially metal) they are blunt same with hole cutters.

Toneyz · Aug 23, 2019

davesparks said:
There's quite a science to drilling a hole in metal and getting maximum drill life and efficient drilling.
Some materials require lubricant to drill them, cutting oil for steel, wd40 for aluminium whereas other materials such as cast iron are self lubricating due to the high carbon content.
Running the drill too fast will wreck it, generally the bigger the diameter the slower the drill should be.
Drills work their best at specific cutting rates, cutting too little material at once can blunt them so a lack of pressure on the drill can kill the drill bits, but too much pressure can kill them too.

Some good advice there Dave thanks.