Microsoft Word 14 Material Removal

2. EXPERIMENTAL PROCEDURE 
 
The work piece material used is carbon silicon carbide composite .The machine used 
is Den ford CNC machine with Fanuc controller. The VMC has a maximum cross 
travel of 170 mm, maximum long travel of 290 mm and head travel of 235 mm with a 
six station ATC. The spindle speed range available is 0-4000 rpm and the feed range 
available is 0-1000 mm/min. Factorial approach [16] which is very effective to deal 
with responses influenced by multi variables is used to conduct the experiments. This 
method is a powerful design of experiment tool, which provides a simple, effective and 
systematic approach to experimentation. This method reduces the number of 
experiments that are required to model the response functions. Traditional 
experimentation is one factor at a time experiment, where one variable is changed 
while the rest are held constant. The major disadvantage of traditional experimentation 
is that it fails to consider any possible interactions between the parameters. An 
interaction is the failure of one factor to produce the same effect on the response at 
different levels of another factor. The factorial design approach has many advantages. 
It allows the interactions to be evaluated so that misleading conclusions can be 

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International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 – 
6340(Print), ISSN 0976 – 6359(Online) Volume 3, Issue 2, May-August (2012), © IAEME 
130 
avoided. This approach also allows the effects of a factor to be estimated at several 
levels of the other factors, yielding conclusions that are valid over a range of 
experimental conditions. It is also impossible to study all the factors and determine 
their main effects in a single experiment. The machining parameters used are as shown 
in Table 1. The experiments are planned according to 2
3
with 4 center points. The 
design matrix with the response parameter MRR is as shown in Table 2. 
Table 1: Machining parameters and their levels