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xbrd - Expansion board design for M1r4 (and beyond) =================================================== This is only a draft and may change quite a bit in the future. Top view: http://downloads.qi-hardware.com/people/werner/tmp/xbrd-top.pdf 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 In the drawing, all dimensions are in mm. Typical dimensions would be things we decide in the design. Maximum dimensions would be limits for the expansion board designer (e.g., to avoid bumping into other components or walls). Unlabeled dimensions are calculated from the parameters and have only an informational character.