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MEASURING TOOLS
Teknik Kendaraan RinganSemester 1nd Class X
Dasar Kompetensi KejuruanSK-KD 6TH
DIAGRAM ALUR PENCAPAIAN KOMPETENSI
Divider
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•Dividers are used to scribe circles and arcs, divide lines and circles. The most common type used in engineering is spring divider.
Dividers must have sharp and fine points, with equal lengths and should be adjusted as indicated
Vernier Caliper
Teknologi dan Rekayasa
•The vernier caliper consists of a fixed jaw and a frame or beam along which is engraved and accurately graduated scale. •A sliding jaw fitted with a vernier scale can be moved along the frame. Use the clamping screws to fix it close to the required setting. •Then the sliding jaw may be finely adjusted along the frame by means of a knurled thumb screw. •When you have finished using the vernier, it must be wiped clean, oiled with a suitable protective oil and stored in a protective box
Vernier Scale
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The main scale is graduated into millimeters, with each tenth millimeter being numbered.
•The vernier scale is made 49 millimeters long and divided into 50 equal parts.•The length of each division is therefore one fiftieth of the total length of 49 millimeters.•1/50 of 49mm = 0.98 of a millimeter
USING VERNIER CALIPERS
Teknologi dan Rekayasa
Vernier calipers are held and adjusted as shown in Figure
1. Look along rather than at the line. Move into a position where the light strikes from the back of the vernier scale at about the same angles as your line of sight.
2. The advantage of vernier calipers is that they may be read from zero up to the length of the main scale, often 250 millimeters or more.
3. They may also have provision for taking depth readings.
Self-help Questions
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Try these vernier readings; the answers are given below
Micrometer
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Micrometers are measuring instruments that enable accurate measurements to be taken.
The principal parts of a micrometers are:1. Frame2. Anvil 3. Spindle and Thread 4. Sleeve or Barrel 5. Thimble
TYPES OF MICROMETER
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Outside Micrometer
Inside Micrometer
Depth Micrometer
Reading the Micrometer
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The sleeve goes from 0 to 0. The last 0 could have a 10 there. It represents a movement of 1 inch (1.000) Each large number is equal to .100. 1= .100, 2= .200, 5= .500 etc. The Lines in between the numbers represent .025 thousands of and you would count them up .025, .050, .075, .100
Reading the Micrometer
Teknologi dan Rekayasa
The Thimble on the side of the sleeve moves as you rotate it. Each mark is = to .001. Each time it moves one full turn it travels a distance of .025.
Reading the Micrometer
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To read you must take each section and add it together for example,The last large Number is 5 so we have .500we have one line past the 5 so we have .025and the thimble is turned to the 7 so we have .007add it together and we have .532
Reading the Micrometer
Teknologi dan Rekayasa
The last large Number is 1 so we have .100we have 1 line past the 1 so we have .025and the thimble is turned to the 13 so we have .013add it together and we have .138
Reading the Micrometer
Teknologi dan Rekayasa
Micrometer SETTING
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Feeler gauge
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feeler gaugeUse to measuring ………………………..………………………..………………………..
DIAL TEST INDICATOR
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dial test indicator reading
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cylinder bore gauge
Teknologi dan Rekayasa
Use to.To measure cyli diameterCorrectness of this measuring instrument until 0,01 mm
This measuring instrument can only be calibrated applies Outside Micrmeter
How to adjust the cylinder bore gaugeSet Out side micrometer as according to measurement standardTurn the lock clam Install the rod into out side micrometerAdjust long dial at zero setting
Measuresment Standard
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Determines rod lengthSelected rod = measuring standard + ( 0,5 ~ 1,0 mm )
cylinder bore gauge
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To get correct measurement result hence shaking down bar cylinder bore so getting smallest measurement..
Upper measurement is taken 10 – 12 mm from surface to block cylinder
measurement at underside thinks 10 – 12 mm from under block cylinder
Measurement done at 3 overhead position, middle & under
Read taken at farthermost minute hand moved towards right
cylinder bore gauge
Teknologi dan Rekayasa
CARA MEMBACA DIAL Jika jarum panjang bergerak
searah jarum jam, maka besarnya nilai hasil pengukuran adalah = standar pengukuran -- berapa kolom yang ditunjuk jarum panjang
Jika jarum panjang bergerak berlawanan arah jarum jam, nilai pengukuran = standar pengukuran + berapa kolom yang ditunjuk jarum panjang
Teknologi dan Rekayasa
Bibliography:
Goodheart- Willcox Grainger KD ToolsToyota Technician
Thanks very much
Presented by Aloysius SudibyoSMK Negeri 1 Magelang
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