Full circle protractor download

See Examples. If you've benefited from this free service please consider helping us support:. Inch or Metric? Please help promote this free service Tell a Friend! Saved Calculations Select Saved Calculation. Click individual diagrams to remove. Large Text Template. Protractor Template. Circle Divider. Hub Spokes Spindles. Cone Template. Scale Image. Volume Calibrate. Center Join. Linear Increments. Diameter Tape. Timing Tape. Right Ascension. Explore benchmark angles using the protractor.

Download worksheets for Grade 4, Module 4, Lesson 5. The following diagram shows a worksheet to learn how to measure angles using a circular protractor.

Scroll down the page for more examples of using the circular protractor. Problem 2: Use a circular protractor to determine that a quarter-turn or a right angle measures 90 degrees, a half turn measures degrees, a three quarter-turn measures degrees, and a full rotation measures degrees.

More specifically, this invention is, in a common embodiment, a hand held scale that allows for measurement of both inside and outside acute and obtuse angles.

Three degreed scales allow the user to simultaneously determine;. In the fitting of trim and decorative pieces to the surface of wall surfaces which meet at angular junctions it has been found that there is no effective way of translating the angle of the wall juncture to a miter saw for cutting the trim.

The most common method for matching trim angles following a corner is to use a device that is laid on the angle and is locked in that position. The device, sometimes called a "carpenter's square", is then laid on the piece of trim to be mitered and a line for the proposed cut is scribed on the piece. The craftsman then takes the piece to his miter saw and sets the saw by "eyeballing" the blade over the scribed line to get the proper cut. In more precise situations the angle setting of the carpenter's square can be transferred to a protractor and that angle reading is then set into the miter saw using a scale provided on the miter saw.

In the first instance above the "eyeballing" of the saw miter angle can be accurate if the craftsman is very experienced and has learned, through trial an error including many "miscuts" or poor "fitups" the necessary position of his saw blade relative to his scribed work. However, the usual situation is that such cuts are often inaccurate, especially when made by anyone less than expect craftsmen whose work entails installing trim pieces routinely.

The second method above is accurate but requires an extra step, that of transferrings the "square" setting to the protractor. The invention provided herein gives a person working with wall trim, such as chair rail, cove molding, base board and other joinery as well as with non-decorative trim installations such as plumbing, electrical conduit, floor and carpet installations, aerospace applications and other situations where angles have to be taken from a surface or an edge and measured for a subsequent operation, a scale that reads not only the whole angle measured and the bisected or miter angle but also the miter angle setting for use on a miter saw having an angle scale incorporated thereon.

A scale is provided that has a full circle disc with a plurality of scale measurements scribed thereon. The full circle disc wheel also has a central portion that, at the center of the disc wheel, is provided with a recess or aperture.

Mountable to the full circle scale is an adjustable leg assembly of two legs which extend beyond the perimeter of the degree disc. The legs are each provided with a means to allow the user to read data from the scale measurements scribed on the disc. A wing nut means, in cooperation with a center pivot point for the adjustable legs, allows the user to adjust tension of the assembly to firmly hold a setting.

The center pivot point has a head portion that fits snugly into the recess or aperture of the full circle disc wheel. The operation, nuances of the design and features of the invention will be realized through a perusal of the drawing figures in conjunction with the reading of the following discription wherein:.

Like figures represent like elements in each of the figures.