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parameters and levels based on conducted pilot experiments. Pilot experiments
conducted by adopting one factor at-a-time approach (OFAT) due to multiple levels of
multiple variables need to study. The aim of the present work is to explore the impacts of
the different process parameters on the response parameters. Standard practice has
been adopted for the Design of the Experiment (DOE) and carried out the experimental
work. DOE performed using Response Surface Methodology (RSM) (i.e., Central
Composite Design (CCD)). Experimental work has been performed with various process
parameters such as air pressure, standoff distance, nozzle diameter, mass flow rate,
abrasive temperature and mixing chamber rotating speed and studied their effect on the
performance parameters like Material Removal Rate (MRR) in gm/min, Perpendicularity
(PR) in degree and Concentrated Diameter (CD) in mm.
ANOVA was carried out to identify the effect of individual input process parameters. The
Study depicts that air pressure is a more significant parameter for MRR with 37.16 %,
Stand of distance (SOD) is a more significant parameter for Perpendicularity (PR) and
Concentrated Diameter (CD) with 38.29 % and 27.93 % respectively. GRA and MOORA
methods have been adopted to optimize the process parameters and results comparison
of both the methods have been carried out for validation purposes. Results obtained from
both the methods identified that the 19th set of results gives the best output
performance with multiple input process parameters amongst the conducted 52
experiments. The confirmation test was conducted for the process parameters specified
in the 19th row and achieved the MRR, PR and CD with maximum errors of 2.99%, 1.65%
and 3.61% respectively. The percentage of errors obtained is very less and below the
acceptable limit as per the standard industry practices.

Key words: AJM, RSM, MOORA, CD and PR.

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