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IJSTR >> Volume 9 - Issue 3, March 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Milling Microwave Printed Circuit Boards With Inconsistent Flatness With Safety Function

[Full Text]



Quang Pham Minh, Huynh Le Vinh, Phuoc, Minh Hieu Dao, An Nguyen Truong, Tran Phuc Hai, Nam, Louis WY LIU



g-code, PCB milling machine, AutoLeveller, LinuxCNC, Mach3, SIW.



A printed circuit board (PCB) with glitches or inconsistent flatness on the surface plane is common in microwave applications. However, so far there has not been any product capable of overcoming this problem during the PCB fabrication process. In this work, we have successfully constructed a PCB milling machine capable of milling a PCB with uneven flatness. Method: The proposed machine is embedded with a firmware to restructure the g-code in a way that the milling machine is commanded to execute the following procedure: Step 1: Create the Heightmap of the PCB by the probing process; Step 2: Convert probing signal to 2-dimensional grid of surface map; Step 3: During the process of actual milling, alter the height of the milling bit on the fly, according to the surface flatness, and equipped with safety function embedded in laser system. Results: The proposed milling machine has successfully milled soft and non-flat high-speed PCB’s with surface height variations in excess of 150 mm and fabricate an antenna embedded circuit with an ability to pause when the plane angle change drastically. The proposed machine was fully functional and was equipped with all the basic safety functionality, but the total cost spent on this project was around US$ 1500, as opposed to the market price of a similar German-made product being sold at US$70,000. Conclusion: A machine capable of milling microwave PCB’s with an uneven flatness with safety function equipped has been successfully constructed at Vietnamese German University at a cost of US$1800, which is far below the market price of a similar counterpart.



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