Investigation into the effects of milling input parameters on the material removal rate and surface roughness of polypropylene + 80 wt. % quarry dust composite during machining

Harrison Shagwira, Job Wambua, Fredrick M. Mwema*, Esther Akinlabi, Tien Chien Jen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This paper presents a study that focused on the utilisation of Taguchi optimisation of spindle speed (N), feed rate (F), and depth of cut (D) towards the surface finish (Ra) and material removal rate (MRR) during the computer numerical control (CNC) milling operation of a novel polypropylene (PP)/quarry dust composite. This study is essential in the determination of the levels to use for the input parameter of the machining (N, F and D) in order to produce a final product of the novel composite material having good surface integrity at reduced production cost and time. The design of the experiment (DoE) was conducted using the Taguchi technique, and an L9 orthogonal array (OA) was used in carrying out nine sets of CNC milling operations. The surface roughness test was then carried out on the machined surface, and the MRR was determined. Additionally, microscopic images of the milled surfaces were taken. The statistical analyses were carried out using analysis of variance (ANOVA), regression analysis, and contour analysis. Results showed that the optimum parameters for speed, feed rate, and depth of cut were 400 rpm, 120 mm/min, and 0.9 mm, respectively, for the MRR and 800 rpm, 120 mm/min, and 0.3 mm, respectively, for the surface roughness.

Original languageEnglish
Pages (from-to)2410-2424
Number of pages15
JournalAdvances in Materials and Processing Technologies
Issue numbersup4
Early online date2 Mar 2022
Publication statusPublished - 30 Nov 2022
Externally publishedYes

Cite this