2.1 Precision measuring tools

• Meaning and importance of precision measurement in a metal workshop
• Precision measuring tools: vernier caliper, micrometer screw gauge and vernier height gauge
• Units and the least count of measuring tools
• Parts, reading and use of the vernier caliper
• Parts, reading and use of the micrometer screw gauge
• Parts, reading and use of the vernier height gauge
• Care and maintenance of precision measuring tools
• Zero error, accuracy and safe use of precision measuring tools

• identify precision measuring tools used in a metal workshop
• use the precision measuring tools to perform a given task in a metal workshop
• maintain precision measuring tools in a metal workshop
• appreciate the importance of precision measurement in a metal workshop

“What is precision measurement?”

“How are precision measuring tools read and used accurately?”

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1. Precision measurement in the metal workshop
   40 min · 1 practice tasks · quiz
   Introduce precision measurement and explain why it matters in the metal workshop.
2. Precision measuring tools
   40 min · 1 practice tasks · quiz
   Identify the three precision measuring tools of the metal workshop.
3. Units and the least count
   40 min · 1 practice tasks · quiz
   Explain the units used and the least count of each measuring tool.
4. The vernier caliper: parts
   40 min · 1 practice tasks · quiz
   Identify the parts of the vernier caliper.
5. The vernier caliper: reading
   40 min · 1 practice tasks · quiz
   Read the vernier caliper correctly.
6. The vernier caliper: using it
   40 min · 1 practice tasks · quiz
   Use the vernier caliper to measure outside, inside and depth sizes.
7. The vernier caliper: care and maintenance
   40 min · 1 practice tasks · quiz
   Care for and maintain the vernier caliper.
8. The micrometer screw gauge: parts
   40 min · 1 practice tasks · quiz
   Identify the parts of the micrometer screw gauge and its principle.
9. The micrometer: reading
   40 min · 1 practice tasks · quiz
   Read the micrometer screw gauge correctly.
10. The micrometer: using it
    40 min · 1 practice tasks · quiz
    Use the micrometer screw gauge to measure small outside sizes.
11. The micrometer: care and maintenance
    40 min · 1 practice tasks · quiz
    Care for and maintain the micrometer screw gauge.
12. The vernier height gauge: parts
    40 min · 1 practice tasks · quiz
    Identify the parts of the vernier height gauge.
13. The vernier height gauge: using it
    40 min · 1 practice tasks · quiz
    Use the vernier height gauge to measure heights and mark out lines.
14. Zero error, accuracy and safe use
    40 min · 1 practice tasks · quiz
    Explain zero error, and the accuracy and safe use of precision measuring tools.