THE CALIPERS   “Calipers are traditionally means of   assessing dimensions”   •COMMONLY USED WITH STEEL RULES OR   OTHER M...
FOR MORE HELP CONTACT MEMuhammad Umair Bukhari            Engr.umair.bukhari@gmail.com               www.bzuiam.webs.com  ...
TYPES OF CALIPERS Direct   reading calipersDial caliper: Simplest form of mechanical caliper Displays a reading directl...
Dial caliperElectronic Digital caliper
VERNIER CALIPER   A measuring instrument consisting of an L-    shaped frame with a linear scale along its longer    arm ...
PARTS OF A VERNIER CALIPER: Outside jaws: used to measure external  diameter or width of an object Inside jaws: used to ...
PARTS OF VERNIER CALIPER:Main scale:Each inch on the main scale is subdivided into 10  equal parts & each of these part is...
READING THE VERNIER CALIPER
VERNIER DEPTH GAGES: These are used to measure the depths of holes,  recesses, slots, counterbores, and so forth It is e...
MICROMETER SCREW GAUGE   A device incorporating a calibrated screw used    widely for precise measurement of small    dis...
MICROMETER(CONTD………)   The principal of the micrometer is:      “A Screw turning in a Nut and end of the screw    advanci...
PARTS OF MICROMETER:
MICROMETER(CONTD….)   The length of the sleeve scale is divided into    10 equal parts of an inch….and each tenth part is...
READING THE MICROMETER•The "1" line on the sleeve isvisible, representing .100“•There are 3 additional linesvisible, each ...
Inspection and testing the calipers
Inspection and testing the calipers
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Inspection and testing the calipers

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Inspection and testing the calipers

  1. 1. THE CALIPERS “Calipers are traditionally means of assessing dimensions” •COMMONLY USED WITH STEEL RULES OR OTHER MEASUREMENT INCREMENTS •Generally provide a dimensional accuracy of 1/64inch
  2. 2. FOR MORE HELP CONTACT MEMuhammad Umair Bukhari Engr.umair.bukhari@gmail.com www.bzuiam.webs.com 03136050151
  3. 3. TYPES OF CALIPERS Direct reading calipersDial caliper: Simplest form of mechanical caliper Displays a reading directlyElectronic digital caliper: Gives more accurate reading than simple calipers Automatically switchable from english to the matric system
  4. 4. Dial caliperElectronic Digital caliper
  5. 5. VERNIER CALIPER A measuring instrument consisting of an L- shaped frame with a linear scale along its longer arm and an L-shaped sliding attachment with a vernier used to read directly the dimension of an object represented by the separation between the inner or outer edges of the two shorter arms. Accuracy up to 1/1000 inch or 0.05mm They are manufactured for either internal or external measurements
  6. 6. PARTS OF A VERNIER CALIPER: Outside jaws: used to measure external diameter or width of an object Inside jaws: used to measure internal diameter of an object Main scale: scale marked every mm Main scale: scale marked in inches and fractions Vernier gives interpolated measurements to 1/10 mm or better Vernier gives interpolated measurements in fractions of an inch
  7. 7. PARTS OF VERNIER CALIPER:Main scale:Each inch on the main scale is subdivided into 10 equal parts & each of these part is again subdivided into quarters…..Thus each individual graduation on the main scale represents 1/40th of an inch………Vernier scale: The vernier scale contains 25 subdivisions in the same total length embraced by the 24 subdivisions on main scale…..thus each individual graduation on the vernier scae represents 1/1000th of an inch…………
  8. 8. READING THE VERNIER CALIPER
  9. 9. VERNIER DEPTH GAGES: These are used to measure the depths of holes, recesses, slots, counterbores, and so forth It is essentially a depth rule with vernier attachments and markings The care should be taken during usage
  10. 10. MICROMETER SCREW GAUGE A device incorporating a calibrated screw used widely for precise measurement of small distances Can be used for inside & outside measurements It is more versatile and accurate of the hand-held measuring device Can give dimensions accurate upto 0.001 inch
  11. 11. MICROMETER(CONTD………) The principal of the micrometer is: “A Screw turning in a Nut and end of the screw advancing towards or receding from the opposite “Anvil “of “C” frame” Adjusting nut Anvil Screw threads C frame
  12. 12. PARTS OF MICROMETER:
  13. 13. MICROMETER(CONTD….) The length of the sleeve scale is divided into 10 equal parts of an inch….and each tenth part is again subdivided into 4 equal parts The micrometer thimble has 25 graduations and each graduation is equal to the 1/1000th of an inch Rotating the thimble for one line moves the spindle longitudinally 1/25 of .025" or .001" of an inch;Twenty five divisions indicate a complete revolution, .025 or 1/40 of an inch.
  14. 14. READING THE MICROMETER•The "1" line on the sleeve isvisible, representing .100“•There are 3 additional linesvisible, each representing .025".025".•The calculation would be 3 x.025" = .075"Line "3" on the thimble coincideswith the reading line on thesleeve,each line representing .001"The calculation would be 3 x .001"= .003“ The micrometer reading is"

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