1 VERNIER CALIPERS 2. USING MEASURING INSTRUMENTS PROPERLY Faces for inside measurements Caliper jaw Scale Depth bar Depth reference plane Caliper scale Finger rest Vernier scale Sliding jaw Faces for outside measurements Lockscrew

1) Checking the instrument 2. USING MEASURING INSTRUMENTS PROPERLY 1) Checking the instrument (1) Confirm that the lockscrew is loose. (2) Wipe the measuring faces and sliding faces. (3) There is not a gap between the measuring faces. (4) The zero points on the scales line up. Gap Zero points

2) Measuring an object 2. USING MEASURING INSTRUMENTS PROPERLY Big object Small object Measuring Depth Inside measurement

3) Reading the scale 2. USING MEASURING INSTRUMENTS PROPERLY Main scale 3 4 5 6 2 8 10 Secondary scale 36mm The 8 graduation 36mm + 0.40mm = 36.40mm

2 MICROMETER 2. USING MEASURING INSTRUMENTS PROPERLY Anvil Spindle Sleeve Ratchet stop Clamp Thimble Frame

1) Checking the instrument 2. USING MEASURING INSTRUMENTS PROPERLY 1) Checking the instrument (1) Confirm that the clamp is loose. (2) Wipe the entire instrument. (3) Turn the ratchet stop and check the spindle rotation. (4) Check the zero point. (5) Adjust the zero point. Zero point

2) Measuring an object 2. USING MEASURING INSTRUMENTS PROPERLY Ratchet stop Use a micrometer stand to avoid the effects of heat transferred from your hand.

3) Reading the scale 2. USING MEASURING INSTRUMENTS PROPERLY Main scale Secondary scale (Thimble) 45 40 75 80 81.0mm + 0.45mm =8.45mm

2. USING MEASURING INSTRUMENTS PROPERLY 3 DIAL GAUGE

1) Check/Measurement 2. USING MEASURING INSTRUMENTS PROPERLY 1mm

2. USING MEASURING INSTRUMENTS PROPERLY Measuring deflection

2. USING MEASURING INSTRUMENTS PROPERLY 4 CYLINDER GAUGE

2. USING MEASURING INSTRUMENTS PROPERLY 1) Measurement Wear Amount

Clearance 2. USING MEASURING INSTRUMENTS PROPERLY Difference = Clearance Piston diameter