Quick/stupid question. Tried going thru kicad, is my understanding correct?
There are 4 outer holes for stacking the pcb, and 4 inner holes for mounting heatsink.
The gap between outer holes is 9cm and between inner holes is 8.5cm.
So if stacking vertically using hex spacers, the heatsink should not be bigger than 8.9 cm x 8.9 cm
^ Is this correct?
Also, whats the diameter of the holes? Would a M3 screw fit or we should use M2 ?
The inner holes are spaced closer than 8.5cm - more like 6.2 x 5.5 cm.
The heat sink should not cover the spacer positions if you use spacers, or unless you put holes in the heatsink. It can extend a full 10cm in one direction as long as the other is < (9cm - spacer radius - a bit).
The holes are 4mm diameter which seemed to about right in metric for the regular ATX motherboard size screws. I don't recall is that's M3 but it sounds right.
Ah thanks.
M3 is 3mm and M4 is 4mm. They just use the Mx rating for screws. Maybe ill try with both. Its best if the screw attaching the heatsink is as snug as possible...