The lathe chuck key should be removed from the chuck after clamping the tool securely.

• A. True
• B. False
• C. Not sure
• D. It doesn’t matter

Answer: (B)

Safety on the lathe requires removing the chuck key before bringing the machine to life. The statement is false because you should not rely on removing the key after clamping or assume it’s safe to start with the key still in the chuck. If the spindle is powered with the key left in place, the key can become a dangerous projectile, potentially injuring you or damaging the work and machine. The proper routine is to tighten the jaws with the chuck key, then immediately remove the key and store it safely before starting the lathe. Always do a quick check to confirm the chuck is clear of tools or keys prior to turning on.