In most cases, this would be a 90° angle and therefore check the squareness of a workpiece. What is a machinist square and how is it used?Ī machinist square is a measuring instrument used to mark off or check the angle of a workpiece, object or feature. For instance, if you need a straight edge to measure 1m, using a 6m long straight edge would likely give an inaccurate picture of how straight the surface is.
This is because parallelism and flatness values increase with size. Where possible, it is recommended to use a straight edge with as short a length as possible. Tool steel is the most economic straight edge material and is useful where accuracy is of secondary concern. It also doesn’t rust or deform giving exceptional tool life. Magnalium is the most lightweight material and so is perfect for general use or where the straight edge needs to be held upwards. Granite will provide the highest accuracy, with both flatness and parallelism being the lowest across the range. They can be made of tool steel, magnalium or granite. Straight edges come in a variety of materials and sizes depending on your application. What different types of straight edges are available? Parallelism measures how parallel the top and bottom of the edge is the higher the parallelism value, the less parallel the edges are and therefore more likely to provide an inaccurate measurement.
Flatness measures how straight the edge is across its length the higher the flatness value, the less straight the edge is.
Key factors to consider when choosing a straight edge is the value of the flatness and parallelism. An example use for straight edges would be checking the flatness of machined surfaces over a length. Most straight edges differ from a ruler in that it does not have a scale along its edge, making it only suitable for measuring flatness or drawing straight lines where measurements aren’t required. Straight edges (or straightedge) are used to measure the flatness of a workpiece, object or feature. What is a straight edge and how is it used? Straight Edges, Machinist Squares & Protractors
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