Īfter the glue is dried run the pieces through the planer and bring down to 15 mm ( 9/16'' ) thick. The two ends were done in one long piece as opposed to two separate pieces so that it would still be able to run thru the planer. The two sides are roughed out at 500 mm (20'' ) long and the two ends need to be roughed out at 230 mm ( 9'' ) long with an exact 76 mm ( 3'' ) opening left in the walnut space. The bottom maple piece is 88 mm high x 16 mm thick ( 3 1/2'' x 5/8'' ), the walnut strip in the middle is 16 mm high x 16 mm thick ( 5/8'' x 5/8'' ) and the top maple piece is 38 mm high x 16 mm thick (1 1/2'' x 5/8'' ). The sides are made up of three pieces glued together. Please be sure to keep them away from young children, they are not a toy and are very dangerous if swallowed!! Supplies Take caution when working with rare earth magnets!! They are very strong and can snap together quite violently (ouch) ! I used millimeters for most of my measurements because when working on something this small it is far easier to mark out,( and being a Canadian were suppose to be on the metric system eh -) but I included the imperial measurements as well. Once the correct combination is met, the main locking bolt is free to move ( by using another magnet ) which unlocks the box and frees the lid to pop open (using the touch-latch pin). The basic premise of the lock box goes like this moving the apparently fixed handles on the ends forward causes 6 rare earth magnets on wooden pins to pop out, then using those magnets on the lid to slide the tumblers inside of the top ( also containing magnets ) to specific number locations. I wanted to come up with a lock with a changeable combination and decided to use four tumblers with each one containing nine possible magnet locations, that gives a total of 6561 possible combinations to unlock the lid! I've always had a fascination with puzzle boxes, wooden locks and magnets, so when the magnet contest was announced I thought I'd incorporate all three into one.
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