When I am using my automatic taper, why does the tape cut at an angle instead of square?

This usually happens if you cut the tape when you are still running the taper. This is because you are naturally running the taper at a slight angle to wall. Be sure to stop running the taper before pulling back on the control tube to cut the tape. When you stop running the taper, your natural motion usually makes the taper more square to the wall, resulting in a better cut.