Peningkatan Kompetensi Praktik Pengecoran Logam Limbah Aluminium dengan Tungku dan Kowi UNNES di SMK Negeri 2 Kendal

Rusiyanto Rusiyanto; Rahmat Doni Widodo; Wara Dyah Pita Rengga; Ruben Bayu Kristiawan; Akmal Hanif Zein; M. Candra Akmalunsyah; Ilham Adi Wijaya; Kaleb Priyanto; Martha Budianto

doi:10.30640/cakrawala.v5i4.8240

Authors

Rusiyanto Rusiyanto Universitas Negeri Semarang
Rahmat Doni Widodo Universitas Negeri Semarang
Wara Dyah Pita Rengga Universitas Negeri Semarang
Ruben Bayu Kristiawan Universitas Negeri Semarang
Akmal Hanif Zein Universitas Negeri Semarang
M. Candra Akmalunsyah Universitas Negeri Semarang
Ilham Adi Wijaya Universitas Negeri Semarang
Kaleb Priyanto Universitas Negeri Semarang
Martha Budianto Universitas Kristen Satya Wacana

DOI:

https://doi.org/10.30640/cakrawala.v5i4.8240

Keywords:

Aluminium Scrap, Evaporation Boats, LPG Furnace, Metal Casting, Vocational High School

Abstract

Automotive (Light Vehicle Engineering) practice at SMK Negeri 2 Kendal generates aluminium offcuts that accumulate unused, and the school had no facility for metal-casting practice. This community service program aimed to improve students' non-ferrous casting competence by using aluminium scrap, an LPG-fired furnace, and crucibles made from evaporation-boat waste developed at Universitas Negeri Semarang (UNNES). The program followed five stages: socialization, technology preparation, training, mentoring, and evaluation. The main session was held on 29 September 2026 with 33 of 35 enrolled students. It comprised a pretest, a theory lecture, a demonstration of furnace and burner operation with occupational safety, sand-mould making, aluminium melting and pouring, shake-out, and a posttest. Mean knowledge scores rose from 29.9 to 71.1 (4.48 to 10.67 correct answers out of 15), with a mean normalized gain of 0.58 (medium). A paired t-test confirmed a significant increase (t(32) = 19.08; p < 0.001), and every participant improved. However, only 48.5% of participants reached a score of 70 or higher. The program also handed a set of casting equipment over to the school and produced a signed Implementation Arrangement between UNNES and the school. It offers a model for vocational learning that links manufacturing skills with material recycling.

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