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Milling two-sided PCBs without alignment pins!

Using the CNC rig itself for position accuracy

junkotronjunkotron
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Alignment of sides on two-layer PCBs in hobby equipment is often done with
alignment pins. Often getting the needed precision requires a lot of hands-on experience.
This project attempts to get precision enough for 2.54 mil spacing using the rig
itself as a measurement device and then computationally transforming the G-code
to the machine coordinates.

hackaday.txt

The long story including some hands-on instructions

plain - 13.16 kB - 05/06/2025 at 11:37

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20250423_142110.jpg

Figure 1, this describes the translation math for each side of four in a rectangle

JPEG Image - 3.29 MB - 05/06/2025 at 11:39

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20250423_142122.jpg

Figure 2. This describes where four points on four sides are projected and then the intersection becomes the new coordinate, PT.

JPEG Image - 3.19 MB - 05/06/2025 at 11:39

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transl_copper.c

The program itself, sometimes needs "-lm" added to the compiler line

C Source File - 12.09 kB - 05/06/2025 at 11:54

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detail_align.jpg

Detail on how the tool can be <b> carefuly </b> lowered into one of the Alignment holes to obtain the machine coordinates.

JPEG Image - 166.40 kB - 05/06/2025 at 12:02

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