A plumber is using a large pipe threading machine on a construction site. The machine is making an unusual grinding noise, and the safety guard over the rotating die head appears to be loose and vibrating excessively. The plumber needs to complete the threading operation for several more pipes before the end of the shift. What is the most appropriate action?

Question: A plumber is using a large pipe threading machine on a construction site. The machine is making an unusual grinding noise, and the safety guard over the rotating die head appears to be loose and vibrating excessively. The plumber needs to complete the threading operation for several more pipes before the end of the shift. What is the most appropriate action?

Answer options: ✅ Shut down the machine immediately, lockout/tagout, and report the defect to a supervisor for repair.

• Continue working carefully, as long as the guard doesn't fall off completely.
• Try to tighten the guard during operation to save time.
• Complete the remaining pipes quickly and then report the issue at the end of the shift.

Correct answer: Shut down the machine immediately, lockout/tagout, and report the defect to a supervisor for repair.

Explanation: A loose and vibrating safety guard on a rotating machine indicates a serious hazard that could lead to injury. The correct action is to immediately shut down the machine, apply lockout/tagout procedures to prevent accidental startup, and report the defect for repair. Continuing to operate or attempting to fix it while running is unsafe.