How to cut a circle in timber or board
If you are really a DIY addict, one of these days you're going to have to cut out a perfect circle in timber and board. It's not that difficult and here's a quick and easy trick that I learn't to do the job in a jiffy!
Hammer a panel pin at the approximate centre point of the board.
Cut a length of chain to half the size of the circle. EG. If you need a circule that is 300mm in diamter the length of chain should be 150mm long.
Pop one end of the chain over the panel pin and insert the tip of a sharp pencil at the other end of the chain.
Pull tight so that the chain is fully extended and slowly rotate around the pin to draw a circle.
You can use this method to create a full circle, a circle within a circle, or a half-circle.
Once finished, remove the panel pin and pop some wood filler into the hole. Sand smooth once dry.
When sanding more than one circle (or other shape for that matter), it helps to clamp them all together and sand all at once, rather than individually.