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

COMPETENCY ACHIEVEMENT DIAGRAM Teknologi dan Rekayasa

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 Teknologi dan Rekayasa

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 Teknologi dan Rekayasa

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. Teknologi dan Rekayasa

Parts Of Micrometer Teknologi dan Rekayasa

Inspection, Tuning And Read of Micrometer Scale Investigates sign “ 0 “ / Zerro Setting Tunes point “ 0 “ Reads result of measurement Teknologi dan Rekayasa

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 Teknologi dan Rekayasa

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 “. Teknologi dan Rekayasa

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. Teknologi dan Rekayasa

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 Teknologi dan Rekayasa

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 Teknologi dan Rekayasa

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 Teknologi dan Rekayasa

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) Teknologi dan Rekayasa

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. Teknologi dan Rekayasa

CREATED BY : MUHSHON KHOIRI & MUKLIS KUSTAMTOMO SMKN 2 KLATEN THANK YOU Teknologi dan Rekayasa