What should be done before making any adjustments to a milling machine?

Prior to making any adjustments to a milling machine, it is essential to shut off the power. This is a crucial safety measure that prevents accidental machine operation during the adjustment process, which could lead to injuries or accidents. Ensuring that the machine is not operational eliminates the risk of moving parts, allowing for safe handling and inspection.

Additionally, while locking the machine in place and blanking the workpiece may be necessary during certain operations to ensure stability and safety, they do not specifically prioritize the immediate safety concerns associated with power being on. Increasing the feed rate is not relevant in the context of making adjustments, as it involves changing the machine’s operation rather than ensuring a safe working environment.