For accurate angular measurement, a sine bar is used in combination with slip gauge blocks. A sine bar may be used to face locate any work to a certain angle or to measure angles very precisely. High chromium steel that resists corrosion in used to make sine bars, which are then stabilized, precisely honed, and hardened. These two cylinders’ axes are parallel to one another and to the top surface of the sine bar at an equal distance from each other. Well, in this reading, I’ll be exploring what sine bar is, its application, principles, its diagram, types, & how it works.
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What Is Sine Bar?
A sine bar is made up of two precision ground cylinders attached at the ends of a hardened, precision ground body. The top of the bar is parallel to a line that passes through the centers of the two rollers, and the distance between the cylinder centers is accurately regulated. When in operation, the distance between the two rollers forms the hypotenuse of a triangle, and it is selected to be a whole number for convenience in subsequent computations. The top edge of a sine bar will be parallel to a level surface when it is positioned on it.
Heavy components often require measurement to check for unknown angles. To perform conical-shaped machining, specially designed sine bars are used to mount the workpiece and determine its angle. These bars are used to set or determine the workpiece at a given angle, as well as to check the flatness of the surface. Sine bar principles involve using a spirit level or dial gauge, along with gauge blocks, to measure angles on the horizontal surface. For example, a wedge is set on a horizontal table to determine its angle. The top edge of the bar will tilt by the same amount if one roller is elevated by a specified distance, typically using gauge blocks. This results in an angle that can be computed using the sine rule.
Slip gauges, a sine bar, and a surface plate are used to precisely construct an angle. By using the standard length of side AB and computing the height of side BC, any angle σ can be set up. The hypotenuse is always the same length, and the measurement between one roller’s bottom and the table’s surface yields the height. The sine rule, a mathematical trigonometric function, is used to compute the angle. Tables that provide dimensions needed to achieve an angle between 0 and 90 degrees, incremented by one minute, may be found in engineering and metalworking reference books.
How Does Sine Center Works?
To adjust the proper angle on a sine device, place the grid blocks under the device’s grid roll. If your gadget has a locking mechanism, tighten it before proceeding. Determine the center distance (C), desired angle (A), and whether the angle is in degrees, minutes, seconds, or decimal degrees. Enter the data in relevant fields, including the decimal point. Choose the ‘Calculate’ option and build a stack of grid blocks (G) to match the size given back. The top edge of a sine bar will be parallel to a level surface when positioned on it. If one roller is elevated by a specified distance, the top edge of the bar will tilt by the same amount. Form an angle that can be computed using the sine rule.
Compound sine tables are high-quality steel bars with exact cylinders attached to each end, allowing for precise grinding of many angles. These tables are made from high-quality steel hardened and ground to 55 HRC 1 2 HRC. They are used to measure the compound angles of massive workpieces, with two sine tables stacked at a right angle. To achieve the necessary alignment, the tables can be twisted and adjusted to a precision of 1/5 of a degree.
Sine tables are large broad sine bars used to hold workpieces during operations, usually with a locking mechanism to secure them in place. They use the same concepts as sine bars, producing right triangles to calculate angles and hold workpieces at precise angles for precision machining and measurement. Sine centers are unique sine bars used for conical shapes with male and female components. They can measure angles up to 60 degrees and are made to fit these unusual forms, offering accurate measurements when used with slip gauges.
