Introduction
Upper Set Gear Dial Indicator is a versatile instrument which is used to measure the profile and size of gears and other cylindrical components. This instrument is mainly used in the automotive and metrology industries. It is a precision measuring instrument which has three styli’s adjustable to different angels, instead of only one stylus, and it also has a dial indicator and a table mounted stand.
Theory of Operation
Upper Set Gear Dial Indicator is an instrument used to measure the profile and size of gears and other cylindrical components. This instrument is based on the principle of shank angle, which involves the measurement of a pattern of deviation from a theoretically perfect circle or helix. The principle consists of two parts. The first part involves the use of two trihedrons, which are three-sided geometric figures that rotate around three mutually perpendicular axes. The trihedrons are set at fixed angles to each other, which determines the direction of the stylus. The second part of the process is the measurement of the deviation of the shape of the surface from a theoretical circle or helix. To do this, values of the deviation are read from the dial indicator.
In this instrument, the dial indicator is mounted upon a table with its vertical arm mounted over the gear or cylindrical component whose profile is being measured. The instrument has three dials or styli, which are adjustable to different angles, and which allow the measurement of bowl shapes. The dial indicator, which is in the horizontal arm of the instrument, houses a needle that reads deviations from the theoretical circle or helix. The dial indicator contains a rotating armature with a pointer attached to it and a scale, which is graduated from 0 to 200 degrees. The needle is moved by a set of teeth which are connected to the input screw. Finally, a micrometer is also attached to the end of the device, in order to adjust the sensitivity of the device.
The procedure starts by adjusting the angles of the three styli’s by using the micrometer. The angle of the first stylus should be at right angles to the axis of the cylinder and the angle of the second and third styli should be at a certain angle to the first. After adjusting the angles, the assembly is clamped in place and the input is connected to the dial indicator. Finally, a sample reading is taken and the accuracy of the readings is checked at different angles of the styli.
Conclusion
Upper Set Gear Dial Indicator is a versatile instrument used to measure the profile and size of gears and other cylindrical components. The instrument is based on the principle of shank angle, and consists of three stylis adjustable to different angles, a dial indicator and a table mounted stand. The manner in which this instrument is used is by first adjusting the angles of the three styli’s and then clamping the assembly in place and taking a sample reading. The accuracy of the readings is checked at different angles of the styli, and finally the input is connected to the dial indicator. This instrument is widely used in the automotive and metrology industries and is an important tool for precise measurement.
