Which of these is NOT a method for balancing a machine?

Static balancing is not a method for balancing a machine in the dynamic sense that involves movement or operation. It refers to achieving balance when the machine is at rest, focusing solely on weight distribution. In contrast, field balancing, insitu balancing, and dynamic balancing are all techniques that address the balance of machines while they are in operation or even under varying conditions.

Field balancing involves setting up equipment in the field to make adjustments and minimize vibration while the machine is running. Insitu balancing is done directly on the machine in its installed location without needing to disassemble it, taking into consideration the operational environment. Dynamic balancing, also performed while the machine is in motion, measures vibrations and makes adjustments to ensure balance across various operational speeds.

Hence, the distinction lies in the operational context; static balancing does not address dynamic characteristics, making it the correct answer to the question.