PaulS:
How are you shuffling the cards?
it's a 3 tray system, right/left and a middle one positioned below. the deck is manually split in two half and put on two trays right/left. each tray has a "conveyor belt" on the bottom that shoots cards toward a middle tray, that's easy but it does not pick cards one by one, more often than not it shoots 2-3 cards together but that's not a problem. i'm working on a system to automatically resplit the deck and reposition the two half onto the right/left trays.
PaulS:
Bending a card doesn't change its weight.
i was talking about measuring the height of the deck
M4L4:
measuring the height of the stacked deck is prone to errors due to the precision needed, even a slightly bent card would screw everything.
using the weight could be interesting but i would still need a really precise measurement