Dial Indicator atau Dial test Indicator (DTI) merupakan salah satu alat ukur mekanik yang sering digunakan.
Prinsip kerja dial indicator yaitu merubah gerakan lurus (naik atau turunnya spindle) menjadi gerakan berputar jarum skala (pointer)
Pada dial indicator terdapat 2 jarum skala, yaitu jarum panjang (long pointer) dan jarum pendek (short pointer).
Cara pembacaan dial indicator
Jumlah strip yang ditunjuk oleh jarum besar berjumlah 100 strip dan apabila spindle bergerak 1 mm ke atas maka jarum panjang akan bergerak kekanan 1 putaran (360⁰).Maka nilai 1 strip pada skala yang ditunjuk oleh jarum besar nilainya yaitu 0,01 mm (1 mm : 100 strip = 0,01 mm).
Sedangkan pada jarum kecil akan bergerak kekiri 1 strip (apabila jarum panjang bergerak 1 putaran, atau spindle bergerak 1 mm), maka nilai 1 strip pada skala yang ditunjuk oleh jarum kecil yaitu 1 mm.
Untuk contohnya, perhatikan gambar di bawah ini :
Apabila jarum spindle bergerak ke atas sebesar 0,40 mm maka jarum panjang akan bergerak ke kanan sebanyak 40 strip.
Fungsi Dial Indicator
Dial Indicator berfungsi untuk mengukur :a. Kebengkokan
b. Keolengan (run out)
c. End play
Baca juga : Cara pengukuran run out dan kebengkokan dengan dial indicator
Cara Penggunaan Dial Indicator
Beberapa hal yang perlu di perhatikan ketika melakukan pengukuran dengan menggunakan dial indicator adalah :- Bersihkan benda kerja dan ujung spindle pada dial indicator.
- Letakkan dial indicator pada landasan (alas) besi dan aktifkan magnetic switch
- Letakkan spindle tegak lurus dengan benda yang akan diukur
- Pastikan spindle menekan benda kerja antara 1 mm sampai 2 mm
- Lakukan set “0” dial indicator sebelum melakukan pengukuran
- Pembacaan hasil pengukuran dilakukan secara tegak lurus antara mata dengan skala ukur pada dial indicator
Bagian-bagian dial indicator
Dial frame : merupakan body atau penutup yang menutupi mekanisme pengukuran di dalam dial
Outer ring (outer frame) : merupakan bagian yang digunakan untuk melakukan langkah set “0” dengan cara memutar bagian outer ring.
Lock screw : merupakan bagian yang digunakan untuk mengunci outer ring, sehingga outer ring tidak dapat berputar
Long pointer : jarum panjang di dalam dial, yang dapat bergerak berputar apabila spindle bergerak naik atau turun
Short pointer : merupakan jarum pendek di dalam dial, short pointer akan bergerak 1 strip apabila long pointer bergerak 1 putaran.
Dial holder : merupakan rangkaian pemegang dia indicator.
Magnetic holder : merupakan dudukan (pegangan) dari mekanisme dial indicator yang dapat menjadi magnet, sehingga dapat menjaga dial indicator tetap dapat berdiri (digunakan) meskipun dalam keadaan miring
Tipe-tipe dial indicator
Dial indicator dibedakan dari tipe penyangga lengannya dibagi menjadi 2 macam, yaitu tipe flexible arm stand dan rigid arm stand.
Sedangkan tipe dial berdasarkan mekanisme nya dibedakan menjadi 2 macam yaitu tipe analog (mekanik) dan tipe digital.
Good article!
ReplyDeleteThis blog also provides a clear example with an image, explaining that if the spindle moves up by 0.40 mm, the long pointer will move to the right by 40 strips. This will also provide me a great professional thesis help thanks for this information, The functions of a Dial Indicator are also mentioned, which include measuring deflection, run-out (keolengan), and end play.
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