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All Journal STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin
Koekoeh KW, Robertoes
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ANALISIS KEKASARAN PERMUKAAN PADA PROSES PENGEBORAN ALUMINIUM 6061 Jannah, Betriqil; Sanata, Andi; Koekoeh KW, Robertoes; Junus, Salahuddin; Ramadhan, M Edoward; Sutjahjono, Hary
STATOR: Jurnal Ilmiah Teknik Mesin Vol 6 No 2 (2023): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Abstract

This research aims to determine the influence of spindle speed, tool diameter, and coolant on the surface roughness in the process of drilling Aluminum 6061 and identify the most optimal variable. Surface roughness is significantly affected by the spindle speed variable, which contributes to 46,47% of the outcome. The coolant variable contributes 31,17%, while the tool diameter variable has the smallest percentage contribution of 9,61%. The process variables for spindle speed (535 Rpm, 865 Rpm, 1520 Rpm) resulted in surface roughness values of (1,467 μm, 1,349 μm, 2,079 μm) respectively. For the tool diameter variable (8 mm, 10 mm, 12 mm), the surface roughness values were (1,765 μm, 1,701 μm, 1,429 μm) respectively. Regarding the coolant variable (water, dromus, oil), the surface roughness values were ((1,995 μm, 1,387 μm, 1,541 μm) respectively. The most optimal surface roughness was achieved with a spindle speed of 865 Rpm, resulting in a surface roughness value of 1.349 μm. Similarly, a tool diameter of 12 mm resulted in a surface roughness value of 1.429 μm, and the use of dromus as a coolant resulted in a surface roughness value of 1.387 μm. Keywords: Surface Roughness, Drilling, Aluminum 6061
PENGARUH SUDUT DEFLEKSI GEAR TAB ELEVATOR TERHADAP STICK FORCE PILOT PADA PESAWAT N-219 Pribadi, Dicki Hendri; Koekoeh KW, Robertoes; ., Sumarji; Syuhri, Ahmad; Rudi Sugara, Imam
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Indonesia geographically is an archipelagic state that has been recognized by international community according to the PBB law of the sea then was ratified by Indonesia into UUD No.17 of 1985. The number of island in Indonesia currently according to BPS is 17.504 island, that makes Indonesia become the largest archipelagic country in the world and make potentially to have pioneer of aircraft. N-219 Aircraft produced by PT.Dirgantara Indonesia is a pioneer of aircraft that has been developed in Indoensia. Aircraft must meet the flight feasibility criteria to ensure flight safety. One of criteria is the value of a stick force pilot (FE), the force that the pilot receives to control the control surface of an aircraft. Regulation value of the stick force pilot reference is Civil Aviation Safety Regulation (CASR) part 23. The method used in this study is modelling the equations of the motion of the control surface balance tab with the elevator. This study seeks to find the optimum equation to meet the CASR23 regulation where the value of the stick force (FE) is ≤ 75 lbs. The result showed the optimum stick force pilot (FE) value in this modelling is equation III . In critical flight conditions the deflection of the balance tab is not enough to meet the design criteria, trim tab deflection (ẟtrim = 0 – 5˚) is used to reduce stick force pilot value and meets CASR23 regulation. In SLS condition all equation modelling meets the design criteria, where the maximum value stick force pilot (FE) is 51 lbs. keyword : stick force pilot, hinge moment, balance tab, trim tab, elevator.
Co-Authors ., Sumarji Ahmad Syuhri Andi Sanata Hary Sutjahjono Jannah, Betriqil Pribadi, Dicki Hendri Ramadhan, M Edoward Rudi Sugara, Imam Salahuddin Junus