The term odd is not meant to describe the angle being measured, but the angle at which you are measuring. The arm protractor is good to use when measuring at odd angles. For a decent model of machinist’s protractor, plan on spending around $40-$50. This allows for more precision in measurement.Īttached to the circular plate is a straight edge that moves as the circular plate moves to allow the user to draw perfectly straight lines to decimals of a degree. The vernier scale refers to the second of hash marks in addition to the main hashes that are labeled by degree number. Attached to the base plate is the circular plate that is typically outfitted with a vernier scale graduated up to 360 degrees. The bevel gauge, as shown below, has a flat base plate so it can lie flush to any work surface. There are models that include a center finder, drill point gauge, and a circle divider. This tool also comes with a lot of bells and whistles, many of which are great for construction and do-it-yourself type projects. The machinist’s protractor makes up for all the places where the simple plastic protractor lacks. The Machinist’s Protractor/Bevel Gauge Protractor This is because, in some cases, you will have to eyeball your mark based on the line shown on the protractor itself, which leaves room for a lack of precision. The plastic circular and semicircular protractors are fine for doing high school level math and making general scale drawings, but for use in construction they can be tricky. The full circle models will go up to 360. The semicircle protractor will have two scales, each graduated up to 180 degrees but in opposite direction.
The semicircular protractor is more like what you may have used in school. They are typically plastic and in some cases have a small adjustable straight edge hinged to the device itself so that lines can be drawn once the angle is matched.
These are the most common type of angle measuring tool you will find. Here are some common protractor types you may find in your local office supply or hardware store and the ways they are best used. Angle Measuring Tool Typesīelieve it or not, there is more than one way to measure an angle. Below you will find a comprehensive presentation on all things protractor and angle measuring: what types are there, how to use them, and even some helpful tips to ensure the angles on whatever it is you’re building are spot on. If this sounds familiar, you’ve come to the right place. But as you are reading this article, it is safe to assume you’ve found yourself in a bit of a do-it-yourself conundrum: you are constructing something that needs precise angles and you’ve neither the tools or the knowledge to accurately obtain those numbers. Remember geometry class? Those pesky little plastic half circles that teacher handed out for measuring triangles? If you’re reading this and having trouble understanding what exactly we are talking about, then it is likely that in high school you belonged to the school of thought that believed “I will never use any of this stuff in the real world.”įor the majority of people, that is probably true. You will find a step by step tutorials as well as video resources to help you use a protractor.
Our professionals share their best advice on how to use a protractor correctly.
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