> Here's a first "very drafty" draft of the top view of the expansion > board we're specifying for M1r4: > > http://downloads.qi-hardware.com/people/werner/tmp/xbrd.ps > > The parameters are as follows: > > Label Description Type Value > ------- --------------------------------------- ------- ------- > B Baseline between J21 and Jxx typ 45 mm > CB Clearance, back max 25 mm > CF Clearance, front max 10 mm > CL Clearance, left (seen from front) max 5 mm > CR Clearance, right (seen from front) max 15 mm > FB Baseline to front wall typ 15 mm > FW Front wall thickness typ 3 mm > HL Header length (long side) typ 900 mil > HW Header width (short side) typ 200 mil >
Rough illustration above, here's a frame marked on M1r3 pcb: http://downloads.qi-hardware.com/people/adam/m1/tmp/m1r4/M1r4_expansion_board_frame.png So can see the idea of how they assemble through J21 and Jxx. - adam
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