Advances in Materials Science and Engineering / 2016 / Article / Tab 2

Research Article

Application of Response Surface Methodology and Central Composite Inscribed Design for Modeling and Optimization of Marble Surface Quality

Table 2

Coded/actual levels of factors.

FactorsSymbolCoded/actual variable level
LowestLowCentreHighHighest
−1.682−1011.682

Belt speed (m/min)0.801.071.481.882.15
Pressure of the polishing head (bar)0.500.801.251.702
Rotational speed of the polishing head (rpm) 409445.69499.50553.31590