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The Outside Micrometer

The Outside Micrometer. Parts of The Metric and Imperial micrometer. Metric micrometer. thimble. sleeve. anvil. spindle. ratchet. lock. frame. Scale. Sleeve. The Imperial micrometer Sleeve Has 40 graduations along its length of 1 inch Each graduation is 1/40 of an inch =0.025inches

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The Outside Micrometer

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  1. The Outside Micrometer Parts of The Metric and Imperial micrometer

  2. Metric micrometer thimble sleeve anvil spindle ratchet lock frame Scale

  3. Sleeve • The Imperial micrometer Sleeve • Has 40 graduations along its length of 1 inch • Each graduation is 1/40 of an inch =0.025inches • Every 4th graduation is larger =1/10 of an inch or =0.1 inch

  4. Sleeve • The metric micrometer sleeve has a total length of 25 mm • The sleeve is broken down in 5 main sections of 5 mm each • Every 5mm section is further broken down to give 10 equal segments with each =0.5mm • Therefore there are 50 divisions on the sleeve

  5. The Thimble • This is the part that is turned • The imperial scale has 25 graduations around the the thimble scale that is numbered 0-25 • Each graduation =0.001 inches • This gives accuracy to 0.001 inches

  6. The metric thimble • This has the part that is rotated • Contains a scale that is around the outside of the thimble • It has 50 divisions numbered 0-50 • Each division is 0.01 mm • This gives accuracy to 0.01mm

  7. The Ratchet • Located at the end of the thimble • Used to control the force or load applied to the micrometer or the work being measured • Prevents the micrometer from being over tightened • When max load reached it will make a clicking sound. Some types use a sliding clutch

  8. The spindle • The spindle is a sliding plunger that moves in a linear direction • One revolution of the thimble moves the spindle 0.025” or 1 graduation on the sleeve • The spindle carries the second of the measuring surfaces that contacts the object being measured

  9. The Frame and Anvil • The frame is the main support member for all other parts of the micrometer • The anvil is located in the far end of the frame and provides the fixed measuring surface • The frame will have the size and type of micrometer marked on it • They are usually made from cast of iron

  10. The lock • May be of a lever type or a roll type • Locks the spindle to the sleeve so that readings can be taken easily • Allows you to capture the reading of the scales

  11. The Vernier scales • This is a new scale that is located on the sleeve near the frame • Allows you to read 0.0001 inches or 0.001 mm • The scale is a subdivision of the thimble scale and breaks 0.001” down by 10 =0.0001 or, on the metric scale 0.01mm divided by 10 =0.001 mm

  12. Standard micrometer Vernier scale lock thimble ratchet anvil spindle sleeve Decimal readout frame scale

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