If you need to draw a line parallel to the edge of a board, set your combination square to the correct measurement like you are using it as a hook rule. This proves most useful when doing production runs of the same component and all boards need the same measurement. When placed on the board, the very end will be where you make your reference mark. Instead of setting your measurement to 2”, I will often set it to the measurement I need from the end of the ruler. Using a Combination Square as a Marking Gauge Just remember to compensate for the ruler starting at 2” instead of 0” like a real hook ruler. You can then hook the head on the edge of the board to do your measuring. A combination square will do the same thing if you set the head to read 2” on the ruler. This is faster and more accurate than trying to hold 0” by hand on the edge of the board. Using a Combination Square as a Hook RulerĪ hook ruler is a ruler that has a small 90 protrusion that lets you hook it over the edge of a board. Any variation in the angle you hold your pencil will cause the line to be out of square. Hold your pencil or marking knife at a constant angle when you mark your line. When using any square, make sure dust is not trapped between the anvil and the wood. The shoulder is the part that touches at 45 degrees. The anvil is the part of the square’s head that touches the wood at 90 degrees. When using a combination square to layout 90 or 45 degrees, make sure the anvil is pressed tightly against the wood. The combination square can measure both 90 and 45 degrees, something most traditional tri-squares cannot. A combination square in its simplest form is an adjustable tri-square with the head that moves up and down the length of the blade. Tri-squares are some of the earliest forms of woodworking measuring and layout tools. Scribing a line with a marking knife and a combination square Using a Combination Square as a Tri-Square I previously wrote an article on how to check bubble levels and squares for accuracy. For every 1″ of length you add to a square, any amount that square is out of 90 degrees is multiplied. At that size, I would stick with a 24-inch Starrett. Combination squares actually come in sizes up to 24-inches. I keep my 6-inch square right in my shop apron pocket. However, 75% of the time, I use my 6-inch square model. Size MattersĪs I mentioned, if I could only have one combination square, it would be the 12-inch model. The iGaging and Woodriver have much thicker blades (rulers) that use hardened steel. When you compare the budget models with the midrange combination squares, it is obvious they are not in the same class. These excellent tools will last you for years. While they do not operate as smoothly, each costs half of what you pay for a Starrett.įor the budget-conscious, I recommend either Empire or Irwin. I own both, and they are extremely accurate. I suppose quality comes with a price.Ī more affordable option would be iGaging or Woodriver. At well over $100 for the 12-inch model, Starrett combination squares run ten times more expensive than some of their competitors. It operates smoothly and is the most accurate you can buy. They invented the tool and are known for making perhaps the best quality combination square around. When buying a combination square, one name comes to mind: Starrett. Using a Combination Square on a Height Gauge.Using a Combination Square as a Depth Gauge.Using a Combination Square as a Marking Gauge.Using a Combination Square as a Hook Ruler.Using a Combination Square as a Tri-Square.When Accuracy Counts, Scribe a Line, Don’t Draw it.It can give draw a 45° straight line in case you lack tools.【Wide application】Woodworkers, engineers, designers and architects, etc. The height of the square tool.【Hole Opener】There are two 3/16 Inch and 5/16 Inch holes at the end, which can better stabilize the drill bit and reduce the deviation of the hole when opening the hole. Very convenient for precise placement measurement, allowing you to easily draw lines on the surface.【Precise measurement】 The pocket ruler is very wide, the slider is flush with the ruler at right angles, the slider can be adjusted by sliding the locking screw to fix the slider, and the line can be drawn vertically for measurement.【Clear Scale】The scale is printed by professional laser, clear and easy to read, one side is imperial indication, the other side is imperial and metric, which is convenient for different measurement units, and the vertical scale at the end is convenient for measuring table saws, edge trimmers, etc. to fix the slider, which is not easy to loosen during use. 【Woodworking ruler set】Using high-quality aluminum alloy, it is precision-machined by CNC, lightweight and portable, and the surface is sprayed and oxidized to make the ruler durable, wear-resistant and not easy to damage.
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