1. MEASURES BY MEANS OF PRECISION MECHANIC MEASURE
METAL CASTING ENGINEERING
GRADE X / SEMESTER 1 AND 2
SK-KD 017

2. COMPETENCY ACHIEVEMENT DIAGRAM
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3. COMPETENCY STANDARD AND BASIC COMPETENCY
Measures by means of Precision Mechanic Measure
BASIC COMPETENCY
Applies equipments of precision meter
Equipments doormat of comparator meter
Looks after precision equipments
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4. LEARNING AIM After learning finish
Educative participant can apply equipments of precision meter
Educative participant equipments doormat can of comparator meter
Educative participant can look after precision equipments
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5. MICROMETER
Micrometer is measuring instrument having high correctness. Usually its(the correctness starts out of 0,01 mm, 0,002 mm until 0,001 mm.
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6. Parts Of Micrometer
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7. Inspection, Tuning And Read of Micrometer Scale
Investigates sign “ 0 “ / Zerro Setting
Tunes point “ 0 “
Reads result of measurement
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8. Posisi 0 yang tidak benar
Zerro Setting
Before used, micrometer must be calibrated beforehand. its way is cleaning anvil and spindle with cloth which have been dropped dilution of alcohol. then rotary ratchet stopper 2 or 3 times until obtained [by] emphasis that is enough. Key spindle on course this with lock clamp/ lock nut.
Posisi 0 yang benar
Posisi 0 yang tidak benar
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9. Tunes Point “0” (Zero)
If mistake under 0,02 Key spindle with lock clamp, then by using rotary adjuster key outer sleeve until sign “ O “ at diametrical thimble with line. After tuning completed, reexamines sign “ O “.
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10. If mistake to 0,02 Key spindle with lock clamp, slackened stopper until free thimble. straightens sign “ O “ thimble with line at outer sleeve and tightens again ratchet stopper. After tuning completed, investigates again point “ O “ to assure that Micrometer has been calibrated truly.
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11. Reads Result Of Measurement
For Micrometer with correctness of 0,01 mm, one divisions above index line at outer sleeve level of 1 mm, while one divisions under index line is 0,50 mm. At directing of scale part of thimble, value one devition /one part is 0,01mm
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12. Example Of Read
Read of scale above index line = 5,00 Read of scale above index line = 0,00 Read of scale at thimble = 20 Total / final Read = 5,20 mm
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13. Measurement Procedure With Micrometer
Prepares micrometer and pairs at its the position.
Prepares gauge block / gauge blocks .
Prepares graph paper.
Cleans anvil , spindle with dust-cloth dropped by alcohol.
Doormat position of zero / zero setting
Gauge block measure / gauge blocks
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14. Measurement Procedure With Micrometer
The biggest gauge block measure until smallest measure.
Mistake value calculate at ascending observation ( N1)
Mistake value calculate at observation declines ( N2)
Mistake value calculate comulative
Sees tables (micrometer standard)
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15. Treatment of Micrometer
Before applied, cleans spindle, anvil from dirt.
Investigates position of null, tunes zero setting.
Applies micrometer, rotary tube rotary until rachet stop sounds 3 times.
Investigates movement of measure axis, does happened wobble as result of its(the abrasion main thread.
Investigates parallelism of measure face, either at spindle and or anvil.
Doesn't misuse micrometer.
Before kept, cleans all part of micrometer of dirt.
Keeps micrometer in its(the potting, packs into special cupboard.
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16. CREATED BY : MUHSHON KHOIRI & MUKLIS KUSTAMTOMO SMKN 2 KLATEN
THANK YOU
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