Deliverable: Keep an eye on the Part Program until it finishes.
If this is the first time you've made this particular part, you probably don't want to just walk away and leave it. Here are some tips on how to monitor progress to make sure everything is going well:
Tip: Be ready with Feedrate Override and E-Stop or Feed Hold.
If this is the first time cutting chips, it's still a good idea to be ready with the Feedrate Override and either E-Stop or Feed Hold, depending on which one is better for your machine.
Tip: Be especially mindful as each tool starts cutting.
This is the time to make sure the tool enters the cut cleanly without chipping or undue noise and to make sure that the feeds and speeds are producing a result that looks and sounds good.
Tip: Make sure the coolant, mist, or air blast is aimed to clear the chips.
Be paranoid about chip clearing. Recutting chips is hard on tool life, and in the worst case, the chips can pile up to the point a cutter gets broken. Also, sometimes a chip will get into the plumbing and can block the coolant. That's a recipe for a broken tool if you don't catch it.
Tip: Watch for untoward vibration and movement of the workpiece.
The cut should be smooth. If the noise is too loud and especially if you see the workpiece move at all, there may be a problem. You may need to adjust the feeds and speeds or find a way to hold the workpiece more tightly.