The Importance of Accurate Measurement in Carpentry Introduction Many pieces of wood have been destroyed by not measuring accurately or prematurely. Sometimes when you make a frame for a painting I forget to add the width of the molding when calculating the length saw and then the bit is useless. This is extremely frustrating and causes a lot of aggravation, especially if the casting is expensive and what is not enough to do it over. The whole idea is to measure, go back to the calculation to see if it was correctly done and measure again, so take your time. Principle 3: 4: 5 When working with large boards, you sometimes have to cut a bit at exactly 90 degrees. If you only have one small square available, this can be a problem extending the line to cut across the full width of the board, as some deviation is only inevitable. This is the following idea that helps when marking the job. Now this is a tip. This is where principle 3: 4: 5 can be useful. It is based on a mathematical equation as 3 square + 4 square = 5 squared so 9 + 16 = 25 where the corner over 5 ft side of the triangle is exactly 90 degrees. If the board width is 4 ft, you make a mark where the clip should be and mark 3 feet away from it. Then you take a string that does not give any (it is not elastic). Measure 9 ft and cut it. Make a mark at the measurement of 5 feet. Clamp the two ends of the string to the board at the above-mentioned marks with small g-clamps. Now take the 5 ft mark on the string and make a mark on the board as it will be exactly 4 ft (the width of the board) across the board and voila! You have the 90 degrees you wanted on board. This principle is used in many businesses, eg. in road construction or in the building trade when laying out foundations. The sides of the triangle can be in multiples of 3: 4: 5 ft, so it can be 3 inches: 4 inches: 5 inches or 30 ft: 40 ft: 50 ft, it doesn't matter, the principle holds the same. This can best be illustrated by a sketch but in this case a description must suffice. Conclusion Careful measurements are very important and cannot be over-prioritized, but not just that, as it is important that a project be carefully scrutinized if you prepare your own plans. Every detail must be carefully calculated, taking into account the width or thickness of your joining material when designing the sizes to be cut, for the cutting list. An error here can ruin expensive pieces if you use exotic wood. A good idea is to get a friend to control your dimensions because you often cannot see a mistake yourself. I guess every wood worker has had this experience in his work.