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"Optical comparators are quality control devices that are used to check if manufactured parts meet set specifications. Optical comparator work by projecting an image of the part on to a screen under high magnification, allowing quality control experts to compare the image with the ideal parameters. Optical comparators are easy to use and their compact nature allows them to be placed in environments with limited space. When buying an optical comparator, there are various factors that a quality control (QC) expert or machinist should consider.\n\nHorizontal or Vertical Light?\n\nThis aspect looks at how the machinist or QC expert would like the beam of light to travel across the optical comparator’s tray. The choice between these two largely depends on the kind of parts or workpieces that the machinist intends to work on. For heavy parts, horizontal light paths work much better while for flat objects, vertical light paths produce more accurate results.\n\nScreen Size\n\nThere is a wide range of screens available for optical comparators and the choice of what to choose largely depends on how you intend to use the machine and the space that you have available. Screen sizes range from 16 to 32 and this determines how much of a part can be examined at a given time. Typically, most optical comparators with screen sizes that are around 16 tend to be smaller, desktop optical comparators.\n\nTray Size\n\nThis also varies from one optical comparator model to another. The tray (also known as the stage) is the part that holds the object that is being examined. The choice of the tray is purely based on the kind of workpieces that you intend to be examining. Workpieces that are heavy might require a sturdier tray. Larger trays, however, are likely to correspond to the size of the optical comparator. On average, optical comparators can have trays that can hold up to 150 pounds of weight. When determining the kind of tray to use, remember that accuracy of the optical comparator can be affected if workpieces are not secured firmly on the tray. It helps to select trays that are suitably tooled to hold parts in place.\n\nType of Lenses\n\nVarious optical comparators come with lenses of varying capabilities. The type of lenses you pick should correspond with the tolerance required from the optical comparator. Powerful lenses are able to magnify the object a lot more allowing you to detect very tiny variances. If your production process requires a very high degree of precision, you should buy more powerful lenses.\n\nWhat Output is Required?\n\nThis refers to whether you are looking to use readouts from the optical comparators, or you would like to use overlays to analyze and interpret the data coming from the optical comparator. Generally speaking, overlays allow you to use very basic models of optical comparators which might be a cost-effective solution. If you need to measure angles and parametric distances, you might need an optical comparator that can do readouts or even one that comes with geometric capability."
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