Advanced PCB drilling machine
Date of Publication
2001
Document Type
Bachelor's Thesis
Degree Name
Bachelor of Science in Manufacturing Engineering and Management
College
Gokongwei College of Engineering
Department/Unit
Manufacturing Engineering and Management
Thesis Adviser
Mark Jansson L. Kho
Defense Panel Chair
Oscar G. Unas
Defense Panel Member
Edgardo Guison
Phyllis L. Lim
Abstract/Summary
The thesis Advanced PCB Drilling Machine describes the development of an automated printed circuit board (PCB) drilling machine through the incorporation of computer interface with electronic and mechanical devices. Numerical control (NC) drill text files generated by PCB design software Protel are interpreted by the software program developed in Visual C++ to determine the absolute coordinates of the holes to be drilled. Positioning of the x-y table, as well as the z-axis, of the machine is done through the use of LM629N-6 chips, which are precision motion controllers that use proportional integral derivative (PID) control to control the speed and direction of the direct current (DC) motors of each axis. Optical encoders provide the feedback signals used by LM629N-6 to control the positioning of the axes. The drive system of the machine is accomplished through the use of lead screws on each axis.
Accuracy and speed are the two main concerns of the thesis. Experiments carried out on the thesis showed that the desired accuracy of +0.01 was maintained by the machine with reduced errors from previous theses. Improvement of the linear speed, which is one of the main objectives of the thesis, was also achieved with a maximum speed of 6 /second. Sample PCB's were drilled using circuits designed in Protel and the results of the drilled holes satisfactorily aligned those of the sample circuits printed on transparencies. A resolution of 0.167/step was also obtained by the Advanced PCB Drilling Machine, which is 0.733 smaller than the minimum allowable increments of previous theses.
Abstract Format
html
Language
English
Format
Accession Number
TU15234
Shelf Location
Archives, The Learning Commons, 12F, Henry Sy Sr. Hall
Physical Description
1 v. (various foliations) : ill. ; 28 cm.
Keywords
Printed circuits--Design and construction
Recommended Citation
Azarias, J. C., Hong, R. L., Lim, A. L., Sy, V. L., & Wong, A. C. (2001). Advanced PCB drilling machine. Retrieved from https://animorepository.dlsu.edu.ph/etd_bachelors/14539