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Vernier, Dial, and Electronic Digital Calipers

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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Vernier, Dial, and Electronic Digital Calipers

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  1. Vernier, Dial, and Electronic Digital Calipers Session 3

  2. 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

  3. Shop Tools and Techniques

  4. 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

  5. Inch Vernier Caliper Shop Tools and Techniques

  6. Inch Vernier Caliper Shop Tools and Techniques

  7. Inch Vernier Caliper Shop Tools and Techniques

  8. 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

  9. 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

  10. Metric Vernier Caliper Shop Tools and Techniques

  11. Metric Vernier Caliper Shop Tools and Techniques

  12. 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

  13. Shop Tools and Techniques

  14. 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

  15. Dial Caliper Shop Tools and Techniques

  16. Dial Caliper Making OD Measurement Shop Tools and Techniques

  17. Dial Caliper Shop Tools and Techniques

  18. Dial Caliper Shop Tools and Techniques

  19. Dial Caliper Shop Tools and Techniques

  20. Dial Caliper Shop Tools and Techniques

  21. Dial Caliper Left Hand Version Shop Tools and Techniques

  22. 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

  23. Reading Dial Caliper 1.300 + 0.048 1.348 Shop Tools and Techniques

  24. Reading Dial Caliper 2.100 + 0.033 2.133 Shop Tools and Techniques

  25. Reading Dial Caliper 54.00 + 0.34 54.34 Shop Tools and Techniques

  26. Reading Dial Caliper 30.00 +0.04 30.04 Shop Tools and Techniques

  27. Shop Tools and Techniques

  28. 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

  29. Digital Electronic Caliper Shop Tools and Techniques

  30. Digital Electronic Caliper Shop Tools and Techniques

  31. Digital Electronic Caliper Shop Tools and Techniques

  32. Dial or Digital Caliper Base Attachments Shop Tools and Techniques

  33. Vernier Depth Gage • Measures depths of holes, slots and recesses • Read same as standard vernier caliper Shop Tools and Techniques

  34. 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

  35. Shop Tools and Techniques

  36. Vernier Height Gage Shop Tools and Techniques

  37. Dial Height Gage Shop Tools and Techniques

  38. Digital Height Gage Shop Tools and Techniques

  39. 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

  40. Precision Height Gage Shop Tools and Techniques

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