Steel is a type of material that is widely used as a main material in the manufacture of various kinds of industrial and automatic machinery spare parts. Some mechanical properties of steel that are often used in design are hardness, ductility and toughness. Often in a design, we have difficulty getting steel with mechanical properties that are appropriate with the design. For this reason, engineering carried out mechanical properties engineering, to obtain steel in accordance with design calculations. AISI 4140 steel is a medium alloy steel. This steel is often used for industrial and automotive machinery parts. This research engineered the mechanical properties of the steel, namely the hardness and ductility of the material. The process is carried out by conducting steel hardening at 850 °C followed by rapid cooling with water media. After that, tempering at temperatures of 300 ᵒC, 400ᵒC and 500ᵒC by cooling together with the furnace. The result is hardness and tensile strength of the material has increased, when compared with untreated material. This method is effectively used to obtain mechanical strength values in accordance with technical planning calculations. . Keywords: Tempering, AISI 4140, Mechanical Properties Engineering

ABSTRAKDesa Mentaras Kecamatan Dukun Kabupaten Gresik merupakan salah satu sentral pertanian dan peternakan di kabupaten Gresik. Salah satu mata pencaharian yang ditekuni penduduk adalah beternak sapi dan kambing. Pakan memegang peranan yang sangat penting dalam rantai produksi  peternakan. Masalah yang dialami peternak desa mentaras yakni proses penyajian pakan kepada ternak biasanya dilakukan secara langsung, tanpa perlakuan atau manipulasi sebelumnya. Hal ini dapat mengurangi efisiensi dalam penggunaan pakan hijauan. Penyajian pakan tersebut cenderung menghasilkan sisa  makanan karena tidak habis dimakan maupun jatuh ke tanah. Kegiatan ini bertujuan untuk memberikan solusi pengolahan pakan ternak untuk mengatasi permasalahan yang dihadapi masyarakat Desa Mentaras. Metode pengabdian masyarakat ini adalah membuat mesin cacah rumput yang digunakan untuk mencacah rumput pakan ternak baik rumput basah maupun rumput kering. Setelah mesin tersebut selesai, kemudian dilakukan workshop penggunaan mesin untuk mencapai tujuan yang telah direncanakan. Hasil dari pengabdian ini diwujudkanlah mesin sesuai dengan konsep desain. Mesin ini menggunakan motor listrik berdaya 1 Hp dan mempunyai kecepatan putar motor 1420 RPM. Kapasitas produksi mesin ini yakni 100 kg/jam untuk pencacahan rumput basah dan 70 Kg/jam untuk pencacahan rumput kering. Dengan adanya mesin ini maka rumput ternak telah tercacah dengan ukuran 3-4 cm dan dapat ditambahkan bahan lainnya guna menambah gizi ternak, sehingga lebih sehat dan gemuk. Kata kunci: mesin cacah; pakan ternak; ternak. ABSTRACTMentaras Village, Dukun District, Gresik Regency is one of the centers of agriculture and animal husbandry in Gresik Regency. One of the livelihoods occupied by residents is raising cows and goats. Feed plays a very important role in the livestock production chain. The problem experienced by farmers in Mentaras village is that the process of serving feed to livestock is usually done directly, without any previous treatment or manipulation. This can reduce efficiency in the use of forage feeds. The presentation of the feed tends to produce food residue because it is not eaten or falls to the ground. This activity aims to provide solutions for animal feed processing to overcome the problems faced by the Mentaras Village community. This community service method is to make a grass chopper machine that is used to chop animal feed grass, both wet grass and dry grass. After the machine is finished, then a workshop on the use of the machine is carried out to achieve the planned goals. The result of this service is that the machine is realized according to the design concept. This machine uses an electric motor with a power of 1 HP and has a motor rotation speed of 1420 RPM. The production capacity of this machine is 100 kg/hour for chopping wet grass and 70 kg/hour for chopping dry grass. With this machine, the livestock grass has been chopped with a size of 3-4 cm and other ingredients can be added to increase the nutrition of the livestock, making it healthier and fatter. keywords: chopping machine; animal feed; livestock

The development of an industrial product arises with various problems and product quality that has high value. One example of a product that needs to be redesigned is a wheelbarrow or handcart. The wheelbarrow is a simple material conveyance which is pushed by hand, one wheel and one operator through the handle. This research aims at an ergonomic and economical handcart, so as to produce a product that can be useful for medium-sized industries and can increase efficiency and increase work productivity. This research was carried out by redesigning the product as a development, where this product is usually used in a building called a traditional material conveying tool, then calculating the axle and pedal stress on a wheelbarrow. In this study it can be concluded that the wheelbarrow or wheelbarrow is designed more ergonomically with several changes including changes in the height of the stalk from the ground to minimize bending when lifting the wheelbarrow, changes in shape and size of the supports to accommodate various lifting positions, other things, changes in shape and the size of the body so that when lifting and pushing the wheelbarrow, the load is more balanced, the addition of a jack to make it easier for users to spill loads from the body, the addition of two rear wheels to make it easier to push the wheelbarrow, and change the handle to make it easier for users

Low carbon steel is steel with a carbon element content of less than 0.25%. This type of steel is widely used in spare parts motorbikeproducts after market. This type of product has a lower hardness level when compared toproducts Genuine Parts. Due to the low hardness value of the steel material when compared to Genuine Parts products, this product wears out faster. Due to this, engineering was carried out to increase the hardness of steel. One way is by using themethod pack carburizing. Theprocess pack carburizing in this study uses teak wood charcoal as a carburizer. This process is done by pre-heating the material in thebox carburizing pack at a temperature of 650 C. After pre-heating, the temperature was increased to 900ᵒC and different holding times were carried out, namely 5.6 and 7 hours. After that, the cooling process is carried out with water. The results obtained were that thematerial pack carburized had a higher carbon value as the holding time increased. The carbon value before treatment was 0.12%, then there was an increase to 1.03% at the holding time of 5 hours, 1.18% at the holding time of 6 hours and 1.37% at the holding time of 7 hours. The results of the hardness testing before treatment were 46.4 HRA on average increased to 83.66 HRA, 84.69 HRA and 84, 82 HRA at 5 hours, 6 hours and 7 hours detention. However, when doing statistical tests, it is not recommended to hold the heating time up to 7 hours when using this medium. This is because the comparison of changes in violence between 6 hours and 7 hours of detention did not show a significant increase in violence