Peningkatan Kompetensi Pengecoran Logam melalui Pemanfaatan Tungku Berbahan Bakar LPG dan Kowi Berbasis Limbah di SMK Negeri 2 Kudus

Rusiyanto Rusiyanto; Rahmat Doni Widodo; Kaleb Priyanto; Ruben Bayu Kristiawan; Muhammad Zakky Mubarok; Muhammad Emir Al Hakim; Yudistira Rijal Andika; Hibban Pasya Hafid; Julivan Brian Womsiwor

doi:10.30640/cakrawala.v4i3.4993

Authors

Rusiyanto Rusiyanto Universitas Negeri Semarang
Rahmat Doni Widodo Universitas Negeri Semarang
Kaleb Priyanto Universitas Negeri Semarang
Ruben Bayu Kristiawan Universitas Negeri Semarang
Muhammad Zakky Mubarok Universitas Negeri Semarang
Muhammad Emir Al Hakim Universitas Negeri Semarang
Yudistira Rijal Andika Universitas Negeri Semarang
Hibban Pasya Hafid Universitas Negeri Semarang
Julivan Brian Womsiwor Universitas Negeri Semarang

DOI:

https://doi.org/10.30640/cakrawala.v4i3.4993

Keywords:

Metal Casting, Crucible, Evaporation Boat Waste, LPG Furnace, Teaching Factory

Abstract

This community service program aimed to improve vocational students’ competence in metal casting by introducing LPG-fueled furnaces and UNNES crucibles fabricated from evaporation boat waste. The partner, SMK Negeri 2 Kudus, faced two main challenges: limited utilization of aluminum scrap from automotive practice and the absence of affordable, durable crucibles for repeated casting activities. The program applied a structured approach consisting of socialization, training, mentoring, and evaluation. Activities included theoretical instruction, pretest–posttest assessment, and hands-on workshops involving furnace operation, crucible utilization, mold preparation, and aluminum casting. Results demonstrated significant improvements: the average pretest score of 4.85 increased to 9.0 in the posttest, reflecting an 85.57% gain in competence. Qualitative observations showed that students developed greater confidence, teamwork, and adherence to safety standards. Beyond competence improvement, the innovation provided a cost-effective and sustainable solution for recycling aluminum scrap and reducing dependence on expensive imported crucibles. The program effectively integrated research-based technology into vocational education and aligned with the Teaching Factory model. This collaboration between university and school can serve as a replicable model for other vocational institutions seeking to strengthen practical skills, sustainability, and industry relevance.

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