![]() When I can not avoid a double sided PCB, I still consider Chinese manufacturers who make 10 of them for 5 Dollars, and deliver in 3 weeks to my door. So I don’t intend to make double side PCB’s. As long as we do not have through hole plating, such PCB’s are really difficult to assemble and solder, and have risks of disconnected vias. In cases where several connections can not be realized on only one side, they can be easily completed using soldered jumper wires.ĭouble sided boards can be made using the same method, but it is a bit more complicated since both sides of the PCB need to be aligned carefully. ![]() This method is good for single sided boards which are not very dense. I did not try finer geometries, but I will test it and share the results here. Flatness of the board and coating uniformity of the copper foil have effects on this result. When I use a 15 degree tip engraving bit, I can easily obtain 0.5mm thick conductors with 0.5 mm isolation channels between them. My CNC has 20 micron step size and a satisfactory positional repeatability for such loads. How fine the PCB geometry can be achieved, depend on the precision of the CNC and the cutting tip. Of course, you will need a desktop CNC for that, but you need it for other purposes too isn’t it? My CNC will be subject of another post in this Blog. No waiting for drying of photoresist or evening it to dry.No need to challenge to clean the blank PCB to prepare it for resist film coating.No chemicals, solvents, acids, contamination,.No Problem of hole alignment with conductor pattern.I can create conductor lines and drill holes using the same machine and same process at once, without removing the board from machine.This method helped me to avoid a lot of headache I have been suffering. Finally I decided to take another route: Engraving copper lamination of the blank PCB using my desktop CNC. But none of them were practical enough, I was spending a lot of time and effort to have a PCB on my assembly table. ![]() I also tried to use photosensitized dry films and toner transfer methods. When these boards are simple, so that they can be realized on a single sided PCB, I used to make them using photoresist spraying and chemical etching methods. Mostly only one or two of printed circuit boards are needed by hobbyists when developing a new device. Selçuk ÖZBAYRAKTAR MARCH 2018 Rev 1 PCB Engraving using a CNC (BU POSTANIN BLOG İÇİNDE TÜRKÇE SÜRÜMÜ DE BULUNMAKTADIR) HOW TO MAKE PRINTED CIRCUIT BOARDS BY CNC ENGRAVING Some of the photos of this publication have been lost during migration to a new platform by BLOGPRESS. ![]()
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