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Vernier, Dial, and Electronic Digital Calipers. Session 3. Parts of the Vernier Caliper. Used to lock readings into place. Bar of 25-division vernier scale graduated same as micrometer. Manufactured with both 25- and 50-division vernier scales. Measuring a Workpiece.

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parts of the vernier caliper
Parts of the Vernier Caliper

Used to lock readings into place

Bar of 25-divisionvernier scale graduatedsame as micrometer

Manufactured with both 25- and50-division vernier scales

Shop Tools and Techniques

measuring a workpiece
Measuring a Workpiece
  • Remove all burrs from workpiece
  • Clean surface to be measured
  • Open jaws enough to pass over work
  • Close jaws against work and lock right-hand clamp screw
  • Turn adjusting screw until jaws just touch work surface
  • Lock clamp screw on movable jaw
  • Read measurement

Shop Tools and Techniques

slide5

Inch Vernier Caliper

Shop Tools and Techniques

slide6

Inch Vernier Caliper

Shop Tools and Techniques

slide7

Inch Vernier Caliper

Shop Tools and Techniques

reading the measurement
Reading the Measurement

1 x 1.000 = 1.000

4 x 0.100 = .400

1 x 0.050 = .050

14 x 0.001 = .014

1.464 in.

A vernier caliper reading of 1.464 in.

Shop Tools and Techniques

metric vernier caliper
Metric Vernier Caliper
  • Parts same as inch vernier
  • Main scale graduated in millimeters
    • Every main division numbered, each 10 mm
    • Fifty graduations on sliding scale with every fifth one numbered
      • 50 graduations occupy same space as 49 graduations on main scale (49 mm)
      • 1 vernier division = 0.98 mm so difference between 1 main scale division and 1 vernier division = .02 mm

Shop Tools and Techniques

metric vernier caliper10
Metric Vernier Caliper

Shop Tools and Techniques

metric vernier caliper11
Metric Vernier Caliper

Shop Tools and Techniques

reading a metric vernier
Reading a Metric Vernier
  • Last numbered division on bar to left of vernier scale represents number of millimeters multiplied by 10
  • Note how many full graduations showing between this numbered division and zero
    • Multiply number by 1 mm
  • Find line on vernier scale that coincides with line on bar and multiply by 0.02 mm
  • Add for total reading

Shop Tools and Techniques

dial caliper
Dial Caliper
  • Dial indicator, hand attached to pinion, mounted on sliding jaw
  • Accurate to within 0.001 inch.
  • 1 revolution = .100 or .200 in. of travel

Shop Tools and Techniques

dial caliper15
Dial Caliper

Shop Tools and Techniques

dial caliper16
Dial Caliper

Making OD

Measurement

Shop Tools and Techniques

dial caliper17
Dial Caliper

Shop Tools and Techniques

dial caliper18
Dial Caliper

Shop Tools and Techniques

dial caliper19
Dial Caliper

Shop Tools and Techniques

dial caliper20
Dial Caliper

Shop Tools and Techniques

dial caliper21
Dial Caliper

Left Hand Version

Shop Tools and Techniques

reading dial caliper
Reading Dial Caliper
  • Read number to left of moveable jaw.
    • Reading is 0.500 inch
  • Readdial face
    • Reading is .028

0.500 + 0.028

0.528

Shop Tools and Techniques

reading dial caliper23
Reading Dial Caliper

1.300

+ 0.048

1.348

Shop Tools and Techniques

reading dial caliper24
Reading Dial Caliper

2.100

+ 0.033

2.133

Shop Tools and Techniques

reading dial caliper25
Reading Dial Caliper

54.00

+ 0.34

54.34

Shop Tools and Techniques

reading dial caliper26
Reading Dial Caliper

30.00

+0.04

30.04

Shop Tools and Techniques

digital electronic caliper
Digital Electronic Caliper
  • Can provide readings to resolution of .0005 in. or 0.01 mm at touch of button
  • No rack, pinion or glass scale
  • Can connect to Statistical Process Control (SPC) equipment for inspection purposes

Shop Tools and Techniques

digital electronic caliper29
Digital Electronic Caliper

Shop Tools and Techniques

digital electronic caliper30
Digital Electronic Caliper

Shop Tools and Techniques

digital electronic caliper31
Digital Electronic Caliper

Shop Tools and Techniques

vernier depth gage
Vernier Depth Gage
  • Measures depths of holes, slots and recesses
  • Read same as

standard vernier caliper

Shop Tools and Techniques

vernier height gage
Vernier Height Gage
  • Variety of sizes:
    • 12-72 in. or 300-1000 mm.
  • Accuracy .001 in 0.02 mm)
  • Offset scriber
    • Attachment that permits setting heights from face of plate
  • Depth gage attachment

Shop Tools and Techniques

slide36

Vernier Height Gage

Shop Tools and Techniques

slide37

Dial Height Gage

Shop Tools and Techniques

slide38

Digital Height Gage

Shop Tools and Techniques

precision height gage
Precision Height Gage
  • Provides quick and accurate method of setting any height within range of instrument
    • Eliminates need for calculating and assembling gage blocks
    • Surface plate used as reference surface
  • Made from hardened, ground round steel bar
    • Measuring steps spaced at 1.000-in (25-mm)
    • Bar raised or lowered by micrometer thimble graduated by steps .0001 in or 0.002 mm
  • Can be used for precision inspection and also connected to statistical process control equipment

Shop Tools and Techniques

precision height gage40
Precision Height Gage

Shop Tools and Techniques