Read the following passage:
Before operating an industrial metal lathe, a machinist must prepare the machine safely. First, ensure the main power disconnect switch is turned off. Next, securely mount and tighten the workpiece inside the chuck using the chuck key. Immediately after securing the stock, remove the chuck key from the spindle to prevent projectile hazards. Finally, close the protective safety shield before restoring main electrical power.
Based on the passage, arrange the machinist's preparation steps in the correct chronological sequence.
- 1Turn off the main power disconnect switch
- 2Mount and tighten the workpiece in the chuck
- 3Remove the chuck key from the spindle
- 4Close the protective safety shield
Answer
The correct chronological sequence is: Turn off the main power disconnect switch, Mount and tighten the workpiece in the chuck, Remove the chuck key from the spindle, and Close the protective safety shield.
The passage provides clear chronological markers: the process begins by verifying the power switch is off ('First'), proceeds to securing the workpiece ('Next'), requires immediate removal of the key ('Immediately after'), and concludes with closing the shield ('Finally').
Step-by-Step Solution
Key Concept
Sequential Detail Extraction
Estimated Time:45s