A technician often has to sketch or design ductwork and the other parts of an HVAC system. Sometimes you have to sketch the room or building you are working with. This means working with lines, angles ...

You can't cut perfect miters with a dull blade, one with too few teeth or one that's designed for ripping. Check your blade for sharpness by cutting a 45-degree miter on a 1x3 or larger piece of oak ...