Graphical Construction Glossary >> Woodwork. >> Joinery >> Winding Sticks
These are a time honoured way of quickly checking if a piece of material is not twisted. Or as we used to say when I were a lad, if it is "in-twist" as opposed to "out-of-twist" or twisted. Note that there is no mention of level here. I am not talking about getting anything level, just checking a piece of timber for twist.
It is very easy to see that by using sticks that are significantly longer than the width of board that you are checking, then that extra length will multiply the amount of twist and make it easier to see. If you don't use the sticks it is very hard for the eye to catch the far edge, and it may not be square anyway.
When fixing heavier timbers to the top of your bench to cramp up door or window frames it is essential to check that they are not twisted in relation to each other in this way. It is very easy to fix one on top of a bit of crap without noticing. The timbers that hold the frame must be true.
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