Before changing tools on the milling machine, which two actions should you perform on the spindles over the plastic table cover?

• A. Raise and Lock
• B. Lower and Unlock
• C. Spin and Secure
• D. Hold and Clamp

Answer: (A)

When changing tools on a milling machine, you want the spindle to be stationary and out of the way of the work area. Raise the spindle to clear the plastic table cover, giving you safe access to the tool holder and preventing any interference with the cover or chips. Then lock the spindle to prevent any rotation while you remove and install tools, reducing the risk of injury or tool misalignment during the change. Lowering would reduce clearance and could create a collision risk, unlocking would allow movement, spinning would be dangerous during a tool change, and holding and clamping the spindle doesn’t address both clearance and immobilization.