CNC 102 - Measuring and Inspection

• Identify the units of a steel rule.
• Describe the descrimination of a steel rule.
• Describe parallax error when using a steel rule.
• Demonstrate how to correctly measure with a steel rule to a discrimination of 1/64th.
• Explain the accuracy of the caliper.
• Demonstrate how to correctly use digital/dial calipers to measure to a discrimination of .001” when measuring the following features: - Outside diameters - Inside diameters - Slot and groove widths Depths of steps and counter bores
• Identify the parts of a micrometer.
• Explain the principles of how a micrometer works.
• Demonstrate how to check and calibrate a micrometer’s zero.
• Demonstrate how to correctly measure outside diameters with a micrometer to a tolerance of .001”.
• Identify the type and range of a dial indicator.
• Explain common uses of dial indicators.
• Explain discrimination fna accuracy of a dial indicator.
• Describe how parallax error will affect the measurement.
• Demonstrate the proper use of a dial indicator.
• Demonstrate how to align a tool concentric to the spindle on a CNC lathe within a tolerance of .001”.
• Identify the discrimination of the dial test indicator.
• Demonstrate how to use a dial test indicator to align a fixture.
• Demonstrate how to use a dial test indicator to dial in a hole concentric to the spindle of a milling machine within a tolerance of .001”.
• Demonstrate the use of a telescoping gage and micrometer to measure a bore.
• Demonstrate how to measure a hole to the tolerance of .001”.
• Demonstrate the proper uses of a surface plate including handling and cleaning.
• Demonstrate the proper uses of an angle plate including handling and cleaning.
• Demonstrate the proper uses of a surface gage including handling and cleaning.
• Explain the process of selecting gage blocks to achieve a certain height.
• Demonstrate the proper uses of gage blocks including handling, cleaning, wringing (stacking).
• Demonstrate the proper uses of a height gage including handling and cleaning.
• Demonstrate the proper uses of a sine bar including handling and cleaning.
• Demonstrate how to measure an angle using a sine bar, gage blocks, surface plate, and surface gage.
• Demonstrate how to measure a position of a hole using a surface plate, angle plate, gage pin, and height gage.
• Choose from a chart the best wire size for the thread pitch being measured.
• Demonstrate how to position the wires and measure with a micrometer.
• Demonstrate how to calculate the current pitch diameter and ocmpare it with the thread standards to determine whether it is within the tolerance.

1. Measuring with a rule (1 week)
2. Measuring with digital calipers (1 week)
3. Measuring with micrometers (2 weeks)
4. Measuring with dial indicators (1 week)
5. Measuring with dial test indicators (.5 week)
6. Measuring with telescoping gages (.5 weeks)
7. Using the surface plate, angle plate, gage blocks, gage pins, height gage, and sine bar (2 weeks)
8. Measuring threads (2 weeks)