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1.2 Objectives
The overall objective of this study is to find the fundamental process for deep cavity machining using Electric Discharge Machine EDM. The study will look at
the fundamental relationship of the machining parameter or process variable and the workpiece parameters.
The machining parameter involves are machining ON time and OFF time Pulse Time, servo voltage SV and peak current IP. While the workpiece
parameter involve is the effect of debris in dimensional accuracy. Beside that, the study also observes the problem that occurs during machining.
Specific objective of the proposed study are:
1. To study the influence of process parameter on dimensional accuracy of deep
cavity machining. 2.
To investigate the effect of debris on deep cavity machining. 3.
To study the surface texture under the influence of debris machining. 4.
To study the effect of debris machining based on surface roughness on the workpiece.
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1.3 Scope of the Project
The scope of this project is to establish an optimum machining condition for deep cavity machining.
1. Current and voltage of EDM machine
a. Voltage and current in the gap define electric power in the gap
P=UI. There exists the optimal set of the setup parameters values to obtain the certain power in the gap and the discharge voltage is nearly
constant at all machining regimes, thus the power in the gap depends only on the current in the gap. In the literature, the boundary surface
current density is given rather then boundary surface power density and it is stated that stable EDM process is achieved when the surface
current density is less than 0.1 A.
2. Dimensional accuracy
a. Surface Texture
To get good surface texture, there are some parameters to consider. When the charge electrode near the workpiece, the spark will occur
and produce debris which affected the surface texture of the workplace. In this experiment, there are some factors to study such as
the current and voltage and also the surface roughness.
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1.4 Problem Statement
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