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All Journal Statistika Jurnal Ilmiah Kursor Jurnal Sains Matematika dan Statistika MESIN PROSIDING SEMINAR NASIONAL CENDEKIAWAN JOIN (Jurnal Online Informatika) Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Desimal: Jurnal Matematika MAJAMATH: Jurnal Matematika dan Pendidikan Matematika M A T H L I N E : Jurnal Matematika dan Pendidikan Matematika JTIK (Jurnal Teknik Informatika Kaputama) JISA (Jurnal Informatika dan Sains) Abdimasku : Jurnal Pengabdian Masyarakat Journal of Integrated and Advanced Engineering (JIAE) JUARA: JURNAL WAHANA ABDIMAS SEJAHTERA JURNAL ABDI MASYARAKAT INDONESIA (JAMIN) Jurnal Pengabdian Masyarakat dan aplikasi Teknologi METRIK SERIAL TEKNOLOGI DAN SAINS Metrik Serial Humaniora dan Sains Kocenin Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Sosial
Joko Riyono
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Religion Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Physics Public Health Social Sciences Other

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Evaluation of Lock Cover and STEM Dimensional Variations on Separation Force Using Multiple Regression and Statistical Process Control Puspa, Sofia Debi; Joko Riyono; Christina Eni Pujiastuti; Sentot Novianto; Larasati Rizky Putri; Ghiffari Awliya Muhammad Ashfania; Joseph Andrew Leo
Desimal: Jurnal Matematika Vol. 9 No. 1 (2026): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v9i1.30842

Abstract

This study addresses a critical limitation in conventional manufacturing analysis by demonstrating that dimensional variation in injection-molded press-fit systems should be interpreted as an interaction-driven phenomenon rather than independent geometric effects. The research focuses on lock stem and cover dimensions produced in a multi-cavity injection molding system, where geometric dependency leads to strong multicollinearity among variables. A quantitative approach was applied using actual production data, including dimensional measurements and separation force testing. Multiple linear regression was employed to model the relationship between geometric parameters and mechanical performance, supported by classical assumption testing and multicollinearity diagnostics. The results indicate a very high coefficient of determination, showing that dimensional variation collectively explains most of the separation force variability. However, severe multicollinearity limits the reliability of individual parameter interpretation and highlights the need for system-level analysis. Statistical Process Control confirms that the process operates within stable limits, while process capability analysis shows compliance with specification requirements. Despite this, variation in separation force persists, indicating high sensitivity to small geometric deviations. These findings emphasize that process stability alone is insufficient to ensure consistent performance. This study introduces an integrated framework combining regression, SPC, and capability analysis, providing both theoretical insight and practical guidance for improving dimensional control in precision manufacturing.
Co-Authors Bijlsma, David Leon Budiyanto , Chandra Ch. Eni Pujiastuti Christina Eni Pujiastuti Dody Prayitno Dody Prayitno Eni Pujiastuti Eni Pujiastuti, Christina Fani Puspitasari Fayza Nayla Riyana Putri Ghiffari Awliya Muhammad Ashfania Joseph Andrew Leo Larasati Rizky Putri Latifa Riyana Putri, Aina Leo, Joseph Andrew Luthfan , M. Aufar Prayitno , Dody Pujiastuti, Ch Eni Pujiastuti, Ch. Eni Pujiastuti, Christina Eni Pujiastuti, Eni Puspa, Sofia Debi Puspitasari, Fani Putri, Aina Latifa Riyana Putri, Dianing Novita Nurmala Putri, Fayza Nayla Riyana Rosyida Permatasari, Rosyida Sentot Novianto Shintadewi Julian , Engeline Supriyadi Supriyadi Supriyadi sutanti sutanti Syaifudin Syaifudin, Syaifudin Syaifudin, - -