5）Double PCBs with thin Keypad pcb;0.4mm finish board thickness
AYER COUNT: 2
MATERIAL TYPE: FR-4
BOARD THICKNESS: 0.4+/-0.1MM
FINISHED COPPER: 1OZ
MIN HOLE SIZE: 0.3MM
HOLE WAL COPPER: ≥20UM
TRACE WIDTH/SPACE: MIM 10/10MIL
SOLDERMASK TYPE: GREEN
SURFACE FINISH: ENIG
Double-Sided PCBs and the Othermill
Process Overview
Milling double-sided PCBs is a straightforward process: mill the top of the board, then mill the bottom. But in order to achieve perfect registration between the two sides, there’s a process that you must follow, which is covered in more detail further down. Here’s an quick overview:
•Install and locate the Othermill’s alignment bracket.
•Align a piece of double-sided FR-1 to the left corner of the alignment bracket.
•After importing your design file, mill out the traces and holes (but not the outline) of the top side of the board.
•With the top side milled, flip the board over and tape it down — this time aligning to the right side of the bracket. By aligning to the right side, we’re using the same corner of the board to align on both sides, which reduces the possibility of alignment errors.
•Mill out the rest of the board including the outline.
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