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COMPARISON OF CHATTER CONTROL OF VARIABLE AND REGULAR HELIX TOOLS IN THE ALUMINUM END-MILLING PROCESS Sonief, Achmad As’ad; Ma'arif, Moch. Syamsul; Pratikto, Pratikto; Juliano, Hans
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 1 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.01.6

In the chatter, machining operations are undesirable because of the phenomena that affect product results, machining accuracy, tool life, and high operating value. Chatter is a vibration phenomenon that occurs in cutting tools due to the self-excitation of the influence of cutting parameters during the operation process of the machine. Types of chatter in machinery are regenerative and resonant. Because the pitch angles of variable helix tools vary, the helix angles of variable tools produce different tooth passing frequencies on each tool eye next to each other and can be used to prevent and control resonance. This study aimed to compare chatter control from the variable helix and regular-angle tools in the aluminum end milling process. The method is carried out through the end milling process experiment to determine the chatter control of the variable helix and regular-angle tools through the stability loop diagram. The results from this study were obtained by comparing control chatters in the milling process through controlling variable and standard helix angles as a guideline to produce the best surface roughness in the end milling process made from aluminum. The comparison of estimated control charts from variable helix tools is more comprehensive than regular helix tools.

PLAT LANTAI PRACETAK DENGAN BETON RINGAN Pratikto Pratikto; Jessica Sagita; Nanda Mustaqim
Jurnal Poli-Teknologi Vol. 15 No. 1 (2016)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v15i1.781

ABSTRACT Installation of floor plate for ordinary terraced house with a conventional method or using Hebel relatively heavy and expensive. In addition, the size of a large hebel an obstacle to mobilization to the work site. This study aims to create a floor plate made of segments. To make it easier to carry, the segment of the floor plate is made using molds that can be assembled in the field to one lane and given reinforcement. Segment of the floor plate is made using lightweight concrete using a pumice stone with dimensions of 25x12x20 cm. The method used is a method in laboratory experiments conducted with a mix design that refers to ACI. Mixture contained in lightweight concrete is Sand: Cement: Pumice: superplasticizer. Sika ViscoCrete 1003 is used to reduce the water content of the concrete so that the weight becomes light. From the test results obtained by the heavy plate segment average floor of 7.47 kg with a compressive strength of 20.61 MPa, a tensile strength divided by 1.2 MPa, flexural strength of 1.63 MPa, and the resulting deflection with maximum compressive strength is 4.01 mm. Keywords : floor plate, segment, lightweight concrete ABSTRAK Pemasangan plat lantai untuk rumah bertingkat biasa dengan metode konvensional ataupun menggunakan hebel yang relative berat dan mahal. Selain itu, dengan ukuran hebel yang besar menjadi kendala untuk mobilisasi ke lokasi pekerjaan. Penelitian ini bertujuan membuat plat lantai yang dibuat dari segmen. Agar mudah dibawa, segmen plat lantai dibuat menggunakan cetakan yang dapat dirakit di lapangan menjadi satu jalur dan diberi tulangan. Segmen plat lantai dibuat menggunakan beton ringan yang menggunakan batu apung dengan dimensi 25x12x20 cm. Metode yang digunakan adalah metode eksperimen yang dilakukan di laboraturium dengan rancang campuran yang mengacu kepada ACI. Campuran yang terdapat didalam beton ringan adalah Pasir : Semen : Batu Apung : Superplasticizer. Sika ViscoCrete-1003 digunakan untuk mengurangi air sehingga bobot isi beton menjadi ringan. Dari hasil pengujian diperoleh berat segmen plat lantai rata-rata 7,47 kg dengan kuat tekan sebesar 20,61 Mpa, kuat tarik belah sebesar 1,2 Mpa, kuat lentur sebesar 1,63 Mpa, dan lendutan yang dihasilkan dengan kuat tekan maksimal adalah 4,01 mm. Kata kunci : plat lantai, segmen, beton ringan

EFFECT OF VARIABLE HELIX ANGLE OF END MILLING TOOL ON VIBRATION AND SURFACE ROUGHNESS OF SS-AISI 304 Sonief, Achmad As’ad; Sasongko, Mega Nur; Widhiyanuriyawan, Denny Widhiyanuriyawan; Pratikto, Pratikto
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.12

Vibration in milling processes adversely affects product quality, machining precision, tool lifespan, and operating costs. A common vibration type, chatter, arises from self-excitation influenced by cutting parameters. Chatter can be classified into regenerative and resonant types. To mitigate resonance, cutting tools with variable helix angles are employed, as their varying pitch angles generate distinct tooth-passing frequencies for each blade. This study investigates the impact of helix angles on cutting parameters during end milling and their effects on vibration amplitude and surface roughness of AISI 304 stainless steel. Experimental end milling trials were conducted with different helix angle tools and cutting parameter variations. The findings reveal that optimizing the helix angle significantly reduces vibration amplitude and enhances surface finish. Controlling helix angle proves crucial for achieving superior surface quality and stable operation in end milling processes of stainless steel materials.

EFFECT OF VARIABLE HELIX ANGLE OF END MILLING TOOL ON VIBRATION AND SURFACE ROUGHNESS OF SS-AISI 304 Sonief, Achmad As’ad; Sasongko, Mega Nur; Widhiyanuriyawan, Denny Widhiyanuriyawan; Pratikto, Pratikto
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.12

Vibration in milling processes adversely affects product quality, machining precision, tool lifespan, and operating costs. A common vibration type, chatter, arises from self-excitation influenced by cutting parameters. Chatter can be classified into regenerative and resonant types. To mitigate resonance, cutting tools with variable helix angles are employed, as their varying pitch angles generate distinct tooth-passing frequencies for each blade. This study investigates the impact of helix angles on cutting parameters during end milling and their effects on vibration amplitude and surface roughness of AISI 304 stainless steel. Experimental end milling trials were conducted with different helix angle tools and cutting parameter variations. The findings reveal that optimizing the helix angle significantly reduces vibration amplitude and enhances surface finish. Controlling helix angle proves crucial for achieving superior surface quality and stable operation in end milling processes of stainless steel materials.

Pertanggungjawaban Pengembang Properti dalam Pembuatan Perjanjian Jual Beli Bawah Tangan dan Notariil Pratikto, Pratikto; Muda, Iskandar; Santosa, Irwan
COMSERVA : Jurnal Penelitian dan Pengabdian Masyarakat Vol. 4 No. 3 (2024): COMSERVA : Jurnal Penelitian dan Pengabdian Masyarakat
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/comserva.v4i3.1406

Tempat tinggal sebagai kebutuhan dasar harus dipenuhi, penyelenggaraan serta pemenuhannya menjadi tanggung jawab negara sehingga masyarakat mempunyai tempat tinggal dan mempunyai rumah yang layak serta terjangkau. Namun dengan adanya keterbatasan dari pemerintah maka kemudian pemerintah menyerahkan kepada pihak swasta atau masyarakat umum untuk menyediakan atau membangun perumahan bagi masyarakat dalam rangka memenuhi kebutuhannya. Salah satu perbuatan hukum yang berhubungan dengan program kepemilikan perumahan adalah adanya perjanjian jual beli perumahan. Dalam praktiknya, perjanjian jual beli perumahan dilakukan di bawah tangan dan secara notariil. Ketika terjadi wanprestasi maka ada tanggung jawab yang harus dilakukan oleh pengembang dan perlindungan hukum kepada pihak pembeli. Penelitian ini menggunakan metode pendekatan yuridis empiris, Data yang dipergunakan adalah data sekunder. Tujuan penelitian ini untuk mengetahui tanggungjawab pengembang dalam pembuatan perjanjian jual beli di bawah tangan dan secara notariil serta perlindungan hukum terhadap pihak pembeli jika terjadi wanprestasi. Hasil dari penelitian ini menunjukan bahwa tanggung jawab pengembang dan perlindungan hukum terhadap pihak pembeli harus dilaksanakan walaupun perjanjian jual beli dilakukan secara di bawah tangan maupun secara notariil.

PERCENTAGE OF HOT MIX ASPHALT MODIFICATION WITH HDPE POLYMER AND SYNTHETIC RUBBER COMPOSITE COMPOSITION BASED ON MARSHALL IDENTIFICATION AND COMPRESSIVE TEST Junus, Stella; Renreng, Ilyas; Pratikto, Pratikto
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.2189

Hot Mix Asphalt is a combination of natural material composition with asphalt in the needs of highway infrastructure that is much needed. This study aims to identify the parameters of asphalt mixtures combined with HDPE type polymers and synthetic rubber in weight percentages of 4%, 5%, and 6% at temperature variations of 1700oC, 2000oC, and 2300oC which include density, Void Filled with Aspalt (VMA), Void in the mix (VIM), Void filled of Bitumen (VFB), Flow and Stability using Marshall tools, with the determination and orientation of loading carried out through a free pressure system or by Compressive Test to determine the fatique value in the loading process carried out. The optimum mixture rate is 5% with a temperature of 2000oC for HDPE type polymers, a mixture of 4% with a temperature of 2000oC for synthetic rubber mixtures, then for mixing both types of fillers the optimum mixing temperature is 1750oC, while the maximum loading value is located at 800 kN / cm2, the average load that can be received is 60 kN/s with cylindrical specimens with a height of 7 cm with a diameter of 10.5 cm.

PENGARUH JUMLAH ISIAN PROPELAN TERHADAP KECEPATAN PROYEKTIL MUNISI KALIBER 40X46 MM NON-LETHAL Sanjiwani, Yudistira; Pratikto, Pratikto; Irawan, Yudy Surya
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1564

Many kinds of non-lethal ammunitions are developed in the last fourty years. The 40x46 mm Non-lethal ammunition is one of several ammunitions ready to be used in riot control. This type of ammunition can be used to subdue the target by implementing impact force. When developing non-lethal ammunition, it should be considered that the ammunition has adequate projectile velocity to ensure that the impact will produce sufficient pain to immobilize the target without risk of permanent injury. Projectile velocity is affected by the propellant weight and projectile weight. Therefore, a study to understand the effect of propellant charge weight on projectile velocity was done experimentally. This experiment was done by preparing several variations of propellant charge weight which were 0.150 gram, 0.200 gram, 0.250 gram, 0.300 gram and 0.350 gram. The desired output of this study is to obtain the correct amount of propellant charge weight to produce projectile velocity in accordance with the 40x46 mm Non-Lethal ammunition specification. The conclusion of this study is that Variation C ammunition with propellant charge weight of 0.250 gram is the closest variation to achieve nominal projectile velocity of 75 m/s. The exact range of propellant charge weight that can be used as production guidelines in order to comply with the product specification is between 0,228-0,280 grams APS350.

COMPARISON OF CHATTER CONTROL OF VARIABLE AND REGULAR HELIX TOOLS IN THE ALUMINUM END-MILLING PROCESS Sonief, Achmad As’ad; Ma'arif, Moch. Syamsul; Pratikto, Pratikto; Juliano, Hans
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 1 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.01.6

In the chatter, machining operations are undesirable because of the phenomena that affect product results, machining accuracy, tool life, and high operating value. Chatter is a vibration phenomenon that occurs in cutting tools due to the self-excitation of the influence of cutting parameters during the operation process of the machine. Types of chatter in machinery are regenerative and resonant. Because the pitch angles of variable helix tools vary, the helix angles of variable tools produce different tooth passing frequencies on each tool eye next to each other and can be used to prevent and control resonance. This study aimed to compare chatter control from the variable helix and regular-angle tools in the aluminum end milling process. The method is carried out through the end milling process experiment to determine the chatter control of the variable helix and regular-angle tools through the stability loop diagram. The results from this study were obtained by comparing control chatters in the milling process through controlling variable and standard helix angles as a guideline to produce the best surface roughness in the end milling process made from aluminum. The comparison of estimated control charts from variable helix tools is more comprehensive than regular helix tools.

Prototipe Alat Monitoring Suhu dan Sistem Kontrol pada Trainer Refrigerasi Berbasis Raspberry Pi 3 B+ Arman, Muhammad; Ayu, Wirenda Sekar; Sugiyarto, Sugiyarto; Pratikto, Pratikto; Hakim, Kamal Amrizal; Sandra, Dinara Safina; Syarief, Eliana
Jurnal Otomasi Kontrol dan Instrumentasi Vol 16 No 1 (2024): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2024.16.1.1

A refrigeration trainer is a working model of an existing system intended to support student learning in the characterization of refrigeration systems, especially their temperature profile. There are many ways to monitor temperature in refrigeration trainers, such as by implementing a temperature monitoring and control system based on Raspberry Pi 3 B +. This project uses the DS18B20 sensor and Raspberry Pi 3 B+ microprocessor. This system has various features such as temperature monitoring, on/off control for fans and compressors, online and offline data storage, and remote control. After 4 hours of testing, the prototype looked stable without any sudden increase or decrease in temperature values for all measurement point parameters. In addition, the error percentage value which is less than 10% shows that the DS18B20 temperature sensor used provides the best accuracy value and is considered adequate for this prototype.

STUDI EKSPERIMENTAL PENGARUH GGBFS DAN SUPERPLASTICIZER TERHADAP KUAT TEKAN DAN MODULUS ELASTISITAS BETON Susilowati, Anni; Pratikto, Pratikto; Hakim, Haudiah; Raden Bagus Anggietantyo Akiranda
Construction and Material Journal Vol. 7 No. 2 (2025): Construction and Material Journal Vol. 7 No. 2 Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v7i2.7749

The use of alternative materials in concrete mixtures is an important effort to improve concrete performance while reducing dependence on cement. This study aims to investigate the effect of adding Ground Granulated Blast Furnace Slag (GGBFS) as a partial substitute for cement on the properties of concrete, both in fresh and hardened conditions, using a constant dosage of type F superplasticizer at 1% of the cement weight. The GGBFS replacement levels used in this study were 0%, 20%, 30%, and 40%. The tests conducted included slump, unit weight, initial setting time, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity. The results showed that the use of GGBFS significantly affected compressive strength and splitting tensile strength, with optimum results achieved at the 20% replacement level. In contrast, other properties such as flexural strength and unit weight were not significantly influenced. Therefore, GGBFS can be considered an effective supplementary material in concrete mixtures when used at an appropriate dosage.

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