How to build a basic seesaw
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Similar project: Seesaw with sliding seats
This is a basic seesaw (also known as a teeter-totter or teeterboard)
In it's most basic form a seesaw is a lever (plank) balanced on a fulcrum.
In this case the lever is a 2x8 (50mm x 200mm) plank.
The fulcrum in this context is a wooden structure consisting of two A-frames (Isosceles triangular shaped) spaced apart slightly wider than the width of the plank,
and held rigid by a series of 1x4 (25mm x 100mm) cross-members (braces) fixed to the edges of the A-frames.
The bottom cross-member (stabilizer) is somewhat longer than the others to stop the unit from tipping sideways.
Add to the above, a piece of pipe (pivot bar) fixed to the underside of the plank in the middle, a couple of handles each end of the plank, and there's your seesaw.
Each A-frame is made up with two legs (two equal side pieces), and a middle upright piece.
Further, three horizontal pieces are added to tie it together.
About the measurements
The measurements throughout this project are given in both standard (inches) and metric (millimetres).
The standard measurements (inches) are given first followed by their metric equivalents in brackets.
The sizes given are the 'nominal sizes', i.e., the size (width, thickness) of the wood before it has been
dressed (surfaced, dimensioned).
A nominal size is a size "in name only" used for identification.
The nominal size may not match the true, 'actual' dimensions (width and thickness) of the wood used in this project.
That shouldn't pose a problem as long as the overall dimensions are adhered to.