Form Grids Measurement Technology
Form grid measurement is a nondestructive testing (NDT) technique used to measure the geometric profile of components with complex shapes. It employs the use of a form grid composed of a series of equidistant points distributed over a defined area. The forms of the components are analyzed through the process of measuring the coordinates for each grid point, thus providing a clear representation of the geometric profile.
Form grids can be used to measure nearly any quality including displacement, thickness, profile and surface topology. This makes them ideal for use in a variety of fields ranging from automotive engineering to medical device manufacturing. The technology is becoming increasingly popular as a means of gaining an accurate, high-resolution representation of complex shapes without the need for expensive scanning or other specialized hardware.
The form grid measurement system consists of three main components: a form grid, a measuring instrument, and a computer tool to analyze the results. The form grid is composed of a matrix of small equidistant points on a very thin substrate, such as Mylar or film. Prior to the measurement, the grid is placed over the surface of the component to be tested and secured in place.
The measurement instrument, most often a CMM (Coordinate Measuring Machine), is then used to measure each point on the form grid. It does this by first locating the center of the grid point and then measuring its coordinates in three dimensions (x, y, and z). The process is repeated for each grid point, resulting in a complete profile of the component.
The data from the instrument is then fed into a computerized data analysis tool such as Metrolog, which is used to compare the grid points against pre-defined geometric parameters, such as roundness, flatness, and other shapes. The comparison helps to identify discrepancies and inconsistencies, allowing for quick and accurate identification of potential problems.
Form grid measurement is becoming increasingly popular in industries where precision and accuracy are of primary importance. Its advantage over other types of measurement lies in its ability to profile components with complex shapes and profiles without being limited by the size of the instrument. Additionally, form grids can be used to quickly and accurately detect any changes in the shape of the component that may have occurred during the manufacturing process or due to wear and tear. This makes them ideal for quality assurance and even long-term monitoring of components in service.
Form grid measurement has recently become less expensive and more widely used due to the availability of better computer analysis software and the fact that the cost for the form grid itself is minimal. In addition, many CMM manufacturers are now offering models that are specifically designed for form grid measurement. As the technology continues to evolve, it is likely that it will become even more widespread in a variety of industries.
