Drill holes without / with copper inside; exported as separate drill files.
How it looks
Real geometry: CORE3588 drill positions from our board file
Every hole in CORE3588, drawn from our board file: amber rings = not plated (8), white = plated (519). The fab gets them as two separate files: core3588-NPTH.drl and core3588-PTH.drl.
1NPTH: a 2.2 mm bare hole for an M2 screw that holds the board in its case.
2NPTH: one of four 2.7 mm bare holes for the stand-offs under the computer module.
3PTH: the three plated holes of the debug header; pins are soldered into them.
4PTH: the white dots everywhere are vias, also plated through holes (508 of them).
Real image: CORE3588, rendered by KiCad from our board file
Close-up of an NPTH, top side, 7 x 7 mm.
1The M2 chassis hole as rendered: a clean hole in the board, no copper ring, no plating.
Real image: CORE3588, rendered by KiCad from our board file
Close-up of PTHs: the debug header seen from the bottom side.
1A PTH from below: copper ring, plated wall and the header pin coming through.
How it works
Where it fits
Both appear in the drill file; plated ones also need the fab's minimum ring and hole sizes. M2/M3 screws go through NPTHs.