Abstract— Drilling operations are used widely in industrial applications. In these operations several drill bits having different drill geometry and different tool materials such as HSS and WC are used to obtain the holes at desired surface quality and tolerances. The big problem in drilling operations with drill bits is to achieve a hole diameter at micron accuracy. In order to be able to drill at desired accuracy the main factor is that the drill bit must be moved at constant feed speed and can be adjusted. In this experimental study, a standard workbench based drilling machine have been used and the computer controlled mechanism have been set up to adjust the Z-axis to drive the drill bit at constant speed, so the drilling diameter will be kept at desired tolerance and at the drill axis. The parameters such as feed speed, drilling length, entering and exit speed related to drilling machine tools are adjusted the software written in Visual Studio C#. Communication between step motor control and computer is provided by control card constituted with microprocessor. Also, operation parameters are saved to the memory by EEPROM installed on the circuit and the working of the system is realized without computer connection. By the installed system the drilling holes at micron accuracy (0.18-0.25µ) were achieved in drilling operations carried out at different feed speeds and drilling lengths on the computer controlled Z-axis drilling machine tools.
Keywords— Drill Bit, Drilling Machine, Hole Diameter Accuracy, Computer Control, Axis Control.
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