![]() ![]() This is the most common mistake I see.DELIVERY SERVICE ORDERS ARE SENT BY COURIER FROM OUR WAREHOUSE (IN JHB AEROTON). The edge that runs away from the pivot point at a 90 degree angle to the lip. REMINDER: Be sure to mark your board along the square edge. That way it doesn't matter how much I go up or over, I am at the same pitch. If I want my trim board to be cut at the correct pitch to match the roof, I can just use the common scale of 7. If it is 12 feet over, I will go 7 feet up. If it is 12 inches over, I will go 7 inches up. These all mean the same thing, For every 12 I go over, I will go 7 up. Which is also 7 in 12, or 7/12, or 7 over 12. In the picture, I held my pivot point on the edge of the board and rotated my hypotenuse down. has more information about roof pitches. As long as your run is a multiple of 12, your rise will be in the common scale. It does not matter if you are reading in inches, feet, or even (for some reason) centimeters. The rise that occurs over the the 12, gives you your pitch. In construction the run is defined as a constant 12, as in inches in a foot. ![]() Rise is a certain distance up from something. Run is a certain amount of distance along something. If you remember back to math class, pitch is defined by rise over run. Roof angles could be identified by degrees but more commonly they are defined by pitch. GOT IT! What is the common scale? The common scale is used to read pitch, for roofs as an example. The common scale is the next scale in from the hypotenuse. The common scale is marked as such, COMMON. First we need to make sure that we are looking at the correct scale. Using the common scale is the same as the degree scale. ![]() ALWAYS DRAW YOUR LINE OUT OF THE PIVOT POINT. What this means is that your line should run along the square edge from the lip. Marking your board- Now that your square is in the right position you need to draw your line so you know what to cut or how to position your pieces. In this picture, the square is held at 25 degrees. Do you see in the picture how the edge of the board forms a ray from the pivot out to the degree scale? With the pivot point of the lip still against the edge of the board, look at where the edge of the board passes through the degree scale. The edge of the lip that the hypotenuse abuts is going to move. This is always going to stay on the edge of the board. The edge that is square to the lip should run straight across the face of the board forming your 90 degree angle. LIke the picture, only the lip will be completely along the edge of the board. Take a board, a 2 x 4 or 1 x 4 works fine, and hold the square so the lip is flat against the long edge of the board and the square lies across the face of the board. Got it! Now that you are looking at the correct scale, it's time to find an angle. It should have numbers ranging from 0 (where the hypotenuse meets the lip) to 90 (farthest away from the lip). The degree scale is the outermost one, the one that lies directly along the hypotenuse. There are two simple ways to know that you are looking at the correct part of the square to read degrees. This is all you need to know about it for now, but I will refer to the hypotenuse later, so I want to make sure you know which edge it is.įirst let's review that we know which scale is the degree scale. On a speed square it is the edge at which we read the degree scale. HYPOTENUSE- This is long side of any triangle. The pivot point is the point at which we rotate the square when we are looking to mark an angle other than 90 degrees. PIVOT- In this picture you'll see the pivot in the bottom left-hand corner. The lip is what we use to hook on to the edge of a board to know that we have the square where we want it. If you look at your square, the lip is the bit that is wider than the rest of the square, the part that makes it not sit flat on the table. LIP- In this picture you'll notice the lip labeled along the left side. We will look at two of those scales in a bit, but first I want to point out some key features that allow the square to work as it does. As you look at your speed square you will notice that there are many different scales common, degrees, hip/val (Hip and Valley for specific roofs), inches along the side.
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