About the lumber. Plans and instructions
About the lumber and dimensions
All dimensions are in both Metric (mm) and Imperial (inches).
The size (width and thickness) of the lumber referred to throughout this project is the nominal size. That is the size of the lumber before it has been dressed, planed and/or seasoned. When the lumber has been dressed, planed and/or seasoned it is then called the ‘actual size’ which is the true size. The actual size of lumber is smaller than the nominal size. For example: 150×50 (2×6) nominal size when dressed may become 140×45 (1 1/2″x 5 1/2″) actual size and 100×50 (2×4) when dressed may become 90×45 (1 1/2″x 3 1/2″) actual size.
Most Countries that use the Metric system generally put the bigger numeral first such as 100×50 (mm), whereas those that use the Imperial system generally put the smaller numeral first such as 2×4 (inches).
The ‘actual size’ of the lumber can vary slightly from place to place but that should not have any effect on the dimensions given throughout this project. What will vary, depending on the actual size of the lumber, is the gap between each row of tabletop boards and seat boards which does not really impact on the finished product.
Project update – The gap between the boards
If you are going to use stock that measures 150mm x 50mm (2 x 6), which is usually lumber that has not been dressed, planed and/or seasoned, go to the plan drawings below.
However… If you are going to use stock that has been dressed, planed and/or seasoned and has a finished size of approximately 140mm x 45mm (1 1/2″x 5 1/2″), then go to the Revised plans (Page 3).
Because if you use the drawings below and use 140mm x 45mm (1 1/2″x 5 1/2″) stock, you will end up with a gap of around 13mm (1/2″) between each tabletop and seat board.
But, if you use the Revised plans (Page 3) and use the same stock size, you will end up with a smaller gap, about 6mm (1/4″) between each tabletop and seat board.
Instructions and drawings.
For 150mm x 50mm (2 x 6) stock size.
The cutting list
Seat and tabletop boards
Use lumber that is suitable for exterior use.
Cut all the seat and tabletop boards to the dimensions as shown in the drawing below. The lumber used for the seat and tabletop boards is 150×50 (2×6) stock. Cut eight pieces of each length, making 56 pieces in all. Cut the longer pieces first to minimize wastage.
The lumber cutting list: Table frame
Cut all the table frame members to the dimensions as shown in the drawing below. The lumber used for the table frame members is 100×50 (2×4) stock.
Plans and instructions continued, materials list
Instructions: Upper and lower frames
Make up both the tabletop support upper frame (d, d1, d2) and the seat support lower frame (c, c1, c2), on flat ground using the lumber in the cutting list above.
The center of both frames should be fixed as shown in drawing below, and the end outer points of the frames (8 each frame) should be equal distances apart.
Nail three metal galvanized strap plates to the top side and to the underside of both frames where they meet in the center (12 strap plates in all). See drawing below.
Instructions: Seat and table top boards
Mark out from the center of both frames (measurements shown in diagram below) along every arm of the two frames. These are used as guides for placing the boards. Nail the cut tabletop boards (A’s) to the upper frame (D’s) beginning with the outer boards (longest boards). Ensure the joins are in the middle of the frame arms and equal distance from the center point of the frame. Continue around the frame with the next longest board and so on, until the table top is complete.
Do the lower (seat) frame (C’s) in the same way using the cut seat boards (B’s).
Use 100mm (4″) galvanized flathead nails to fix the boards to the frame. Drill nail holes first to keep lumber from splitting.
Instructions: The legs
Lay the finished table top upside down on even ground. Position the finished seat frame upside down above the tabletop. Place packers or blocks under the seat frame until the seat frame sits at the appropriate height above the tabletop frame. Position the legs in place as per below drawing. Hold with clamps, drill and bolt.
Eazy with a Z!
|150×50 (2×6) stock||tabletop boards and seat boards||32 meters (110 ft)|
|100×50 (2×4) stock||frame and legs||24 meters (80 ft)|
|10mm x 110mm (3/8″x 4 1/2″) galvanized carriage bolts||bolting legs to frame||16|
|4″ galvanized flathead nails||2kg (4.5lb)|
|300mm x 25mm (12″ long x 1″ wide ) galvanized strap||Top and underside of frame centers||12|
These project drawings call for 140mm x 45mm (1 1/2″x 5 1/2″) lumber to be used for the seat and tabletop boards.
If the true size of the lumber that you are going to use is approximately 150mm x 50mm ( 2 x 6″), which is usually lumber before it has been dressed, planed and/or seasoned, then go see picnic table project (Page 1).
For building instructions, materials list and a bit more about lumber sizes, go see instructions (Page 1).
Plans for picnic table using 140mm x 45mm (1 1/2″x 5 1/2″) stock