A worksheet for calculating dimensions for plywood drawers constructed with a simple rabbet joint.
Inside dimensions of the cabinet:
cabinet width = 20.000in cabinet depth = 19.750in cabinet height = 9.500in number of drawers = 2 # the vertical space is evenly divided between the drawers
Clearances, margins and reveals:
material thickness = 15in/32 # 1/2 plywood bottoms material thickness = 0.25in # 1/4 plywood saw blade kerf = 0.100in # not particularly important rabbet depth = 0.250in # should be fine for both the 1/2" and 3/4" plywood sides slot depth = 0.250in # slot for the drawer bottom wood movement = 0.0625in # used only to calculate the size of the drawer bottoms slide clearance = 0.500in + 0.030in # drawer slide thickness + the requisite tolerance of 0.030" back clearance = 0.750in # clearance between the back of the cabinet and the back of the drawer bottom margin = 0.500in # distance to the bottom of the slot from the bottom of the drawer side reveal = 0.250in # reveal between the drawers
Drawer parts’ dimensions:
height = (cabinet height - (number of drawers + 1) * reveal) / number of drawers => 4.375in front = cabinet width - slide clearance * 2 # same applies to drawer back => 18.94in side = cabinet depth - back clearance - (material thickness - rabbet depth) * 2 => 18.5625in bottom width = front - material thickness * 2 + slot depth * 2 - wood movement => 18.44in bottom height = side - wood movement => 18.5in
Some additional measurements:
# the inside hight of the drawer drawer depth = height - bottoms material thickness - bottom margin => 3.625in # these guys usually come in 2" increments, so plan accordingly slide length = side + (material thickness - rabbet depth) * 2 => 19in # estimate for the amount of plywood required to build the drawers plywood length = front * 2 + side * 2 + saw blade kerf * 5 => 75.505in plywood width = height * number of drawers + saw blade kerf * (number of drawers + 1) => 9.05in bottoms plywood length = bottom height * number of drawers + saw blade kerf * (number of drawers + 1) => 37.3in bottoms plywood width = bottom width * number of drawers + saw blade kerf * (number of drawers + 1) => 37.18in
September 23, 2013
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