I am planning to use a PCB-mount triaxial connector, CBBJR79TL, in a design for a laboratory prototype. Making reference to the "recommended mtg hole pattern" section from the CBBJR79TL drawing, I have attempted to make a footprint in KiCAD. I am new to PCB design generally, as well as KiCAD specifically.
There are 6 pads. The pads are located at (-79,0), (21,0), (129,129), (-129,129), (129,-129), and (-129,-129). Pad Number 1 corresponds to the center conductor, Pad Number 2 corresponds to the inner shield, and Pad Number 3 (technically 4 contacts) corresponds to the outer shield. All units are in mils.
How to interpret the dimensions provided on the drawing?
The pins themselves appear to be 50x40 mil (+-5mil in each dimension), and yet the recommended hole diameter is 62.5 mil. Suppose I add 22.5 mil of pad diameter to account for the annular ring -- that leaves a total pad size of 85 mil. The closest of the two pads (Pad 1 and Pad 2) are 100 mil apart (center to center). With a total pad size of 85 mil, this means that there will be only 15 mil of solder mask between (edge to edge) of Pad 1 and Pad 2. This distance is lower than recommended pad separation distances (50 mil) for through-hole parts that I have come across online.
That being said, I am unsure what Pad Size and Hole Size I should be using. I have a feeling I am missing something – perhaps something related to the pre-tinning note (note 7) on the drawing?