Sentra Rakyat Rakyat (SPR) is a collection of cattle breeders in the Subang Regency area. SPR aims to raise beef cattle and provide ruminant feed. Ruminant feed made from corn hump waste. The disc mill machine is used in the process of destroying corn lumps into flour, flour from the results of this corn hump will be combined with other components to form a ruminant feed for cattle feed. The process of making feed is disrupted because the disc mill machine is damaged. This study aims to detect damage to the engine and clasification maintenance of disc mill machines using the Inspection, Medium Repair, Small Repair, and Overhaul (ISMO) methods. The method used in data collection is in the form of interviews and observations. Data is analyzed qualitatively description. The results of this study are (1) machine damage, namely the disc mill cutting blade allowance caused by the destruction of the engine shaft bearing; (2) More maintenance is needed on filter sections, cutting blades, crankshafts, v-belts and bearings.

Penelitian ini bertujuan untuk: meningkatkan kualitas pembelajaran pada mata pelajaran kerja mesin lanjut menggunakan Model Praktik Berpasangan dan mendapatkan bukti peningkatan hasil belajar kerja mesin lanjut setelah diterapkan Model Praktik Berpasangan. Penelitian ini merupakan Penelitian Tindakan Kelas (PTK), menggunakan desain Kemmis & Taggart. Pengumpulan data menggunakan teknik observasi, catatan lapangan, wawancara dan studi dokumen. Analisa dilakukan dengan analisa kualitatif untuk menggambarkan suasana pembelajaran yang berlangsung dalam kelas dan analisa kuantitatif untuk melihat perkembangan hasil belajar siswa dan kualitas pembelajaran. Hasil penelitan menyimpulkan bahwa: (1) penerapan pembelajaran menggunakan model praktik berpasangan dapat meningkatkan kualitas pembelajaran ditinjau dari aktivitas guru, aktivitas siswa, dan hasil pembelajaran yang meliputi persiapan kerja, proses kerja, hasil kerja, sikap kerja, dan waktu; dan (2) nilai rata-rata aktivitas guru mengalami peningkatan (dalam siklus I= 77.6, siklus II= 87.9, dan siklus III= 96.4). Nilai rata-rata aktivitas siswa mengalami peningkatan (dalam siklus I=70, siklus II= 86, dan siklus III= 96). Nilai rata-rata hasil belajar siswa mengalami peningkatan (dalam siklus I=70, siklus II 72.9, dan siklus III 78. Kata Kunci: Model Praktik Berpasangan, Kualitas Pembelajaran, Praktik Membubut THE EFFORT TO IMPROVE OF THE QUALITY OF TEACHING LATHE OF ADVANCED MACHINERY WORK USING THE PAIR WORK MODELAbstractThis study aims to improve the quality of teaching lathe practice of advanced machinery work using the pair work model and obtain evidence of improved learning outcomes in the subject after the implementation of the model. This research is class room action research, used the design by Kemmis & Taggart. The data were collected through observation, field notes, interviews and document. The data analysis used the qualitative analysis to describe the atmosphere of learning that took place in the classroom and the quantative analysis to see the development of the students’ learning outcomes and the quality of learning. The results of the research conclude that: 1) the application of the teaching using the pair work model can improve the quality of teaching in terms of the teachers’ activity, and students’ activity; and 2) the average activity score of teachers’ activity has increased (in Cycle I= 77.6, in Cycle II= 87.9, and in Cycle III= 96.4). The average score of students’ activity increases (in Cycle I= 70, in Cycle II= 86, and Cycle III= 96). The average score of students’ learning outcomes has increased (in Cycle I= 70, in Cycle II= 72.9, and in Cycle III= 78).

<p><em>Pembuatan pakan ternak ruminansia terdiri dari dedak, ampas kecap, mineral, urea, garam, dan limbah bongkol jagung. Limbah bongkol jagung diolah menjadi partikel yang lebih kecil menggunakan mesin disc mill. Mesin disc mill milik kelompok ternak Budi Asih mengalami kerusakan pada bearing dan sabuk v-belt. Penelitian ini bertujuan untuk membantu proses perbaikan dan pemeliharaan mesin disc mill tersebut. Metode pengambilan data dilakukan melalui dokumentasi kemudian data diolah secara deskriptif kualitatif. Hasil penelitian menunjukkan bahwa: (1) Alat dan bahan yang digunakan dalam proses perbaikan mesin disc mill adalah tool box lengkap (kunci ring dan pas), WD-40, tang, palu, obeng plus dan min, gerinda, mata gerinda, traker, jangka sorong, mistar, minyak gemuk, oli, kain majun, dan amplas halus; (2) Langkah-langkah perbaikan bearing dan sabuk v-belt pada mesin disc mill adalah membuka pengunci mesin bagian depan, memisahkan pisau pemotong dan saringan dari rumah mesin disc mill, melepaskan sabuk v-belt dan mur pengunci, melepaskan poros engkol dengan menggunakan palu, menggunakan traker untuk melepaskan puli dan bearing, mengukur diameter bearing menggunakan jangka sorong, mengamati kerusakan pada poros engkol dan bearing, memberikan oli pelumas pada poros engkol, mengganti bearing se-tipe yang baru, memasang kembali bearing ke poros engkol, memberikan minyak gemuk pada bearing, memasang kembali poros engkol ke mesin disc mill, memasang kembali pisau pemotong dan saringan, mengendorkan mur dan memasang kembali sabuk v-belt yang baru, langkah terakhir membersihkan mesin dengan kain majun; dan (3) Perencanaan perawatan mesin melalui validasi ahli, perawatan yang dipilih yaitu perawatan bulanan dengan metode ISMO.</em></p>

Cow milking machines are used to help farmers in mountainous areas in the milking process. The problem faced is that it takes a schedule and selection of appropriate engine maintenance methods so that the milking machine for cows is not easily damaged. This study aims to make a schedule and determine the engine components that must be treated. The data obtained are then processed descriptively qualitatively. The results of the study concluded: (1) the maintenance of a portable milking machine with a bodypack model is carried out every day using the Inspection, Small Repair, Medium Repair, and Overhaul (ISMO) methods; (2) the main components to be examined are the electrical parts of the machine, the machine box, the putting straw, the milk container, and the carrying case; (3) routine maintenance carried out is proven to be able to maintain and extend the life of the portable milking machine model bodypack.