As the title says, I broke my 1/8" cutting bit when starting a drilling operation.

The chuck/bit came down to the project but didn't start to turn and I didn't get to the stop button in time to prevent the bit snapping off.

Unfortunately I let my frustration get to me and simply switched the machine off and launched the ruined project out of my shop door into the yard.

So now that I'm somewhat more calm, how do I go about diagnosing the problem to prevent this from happening in the future?