All about optical comparators, and why you should avoid them. Mechanical measurements and metrology mechanical measurements and metrology 10me42b unit 3 comparators and angular measurement instructor. Optical comparators and profile projectors by starrett. The various ways in which the comparators can be used are. It works on the principle of a button spinning on a loop of a string. Mechanical optical comparator mechanical optical comparator consists of plunger which is attached with lever and a mirror on which the light strikes from the source. Since the physics behind optics hasnt changed, the only possible improvements in comparator technology revolve around the quality of the optics themselves, and the features added to the comparator to make taking measurements. Optical comparators, often called comparators or profile projectors, are timetested and cost effective for businesses.
It works on gears pinions, linkages, levers, springs etc. We accept older model comparators as tradeins, and we buy surplus comparators. Optical comparator works by using lens, mirrors, light source etc. Compartors are mainly 8 types the mechanical comparators are usually cheaper in comparison to other devices of amplifying these are usually robust, compact and easy to handle. If you check angles by rotating the screen remember the glass can slip inside the ring. Optical comparators mechanicaloptical comparators youtube. Mechanical optical comparators are same as the optical comparators but the plunger in mechanical optical comparator will be replaced with the pivoted levers. Comparators mechanical engineering mcq questions and answers. Our partner, certified comparator products, procures, remanufactures, and certifies optical comparators and profile projectors. The comparator plays an important role in the electronic circuit design. Sigma comparator is one type of mechanical comparator developed by the sigma instrument company, usa. There are no pure optical comparators but the instruments classed as optical comparators obtain large magnification in these instruments contributes principles though mechanical magnification.
Optical comparators precision measuring tools grainger. Apr 10, 2020 a comparator works on the relative dimension, which means it can measure the difference between basic dimensions with the actual dimension. The optical magnification is also free from bending, friction, wear etc advantages of optical comparator. All ccp preowned comparators undergo an exhaustive service check, and come with our ccp satisfaction guarantee right to return for full credit policy. In the focal plane of the eyepiece, a fine reference line index is provided and the system of lenses is so arranged that the image of the scale is projected in the same focal plane. They are available in both single and multimag configurations. An optical comparator is one of the types of a comparator which is made up of optical means. Ijsrd international journal for scientific research. Pneumatic comparator works by using high pressure air, valves, back pressure etc. The comparators are classified according to the principles used for obtaining magnification. You should periodically check the alignment of the glass centerline against the travel of the table. Pdf mechanical measurements and metrology mechanical.
The light coming form source is directed on the calibrated scale. Using optical measures, the comparator projects a magnified image of the part onto a glass screen so twodimensional measurements can be taken and compared to prescribed specifications. When st introduced the model 1500 vertical beam optical comparator in the 1950s, it allowed companies of all sizes to afford the technology of profile projection. Comparators mechanical engineering mcq questions and. Vertical benchtop optical projector the vb400 vertical projection comparator allows flat parts to be simply laid on a glass insert in the workstage. These are of robust construction and compact design. Mechanical optical comparators working principle, advantages of optical comparators, disadvantages of optical comparators. Comparators play a vital role in making electrical and electronic projects. It is available in amplifications ranging from x 500 to x. Linear measurement comparators mechanical comparators dial. Get info of suppliers, manufacturers, exporters, traders of mechanical comparator for buying in india. A 14 benchtop horizontal comparator featuring brighter led.
With a broad portfolio tailored to meet a variety of system requirements, from ultralow power to high speed, our comparators will help you meet the performance specifications of your next design. Optical comparators nikon metrology nikon metrology. Optical comparators are used for an exceptionally wide range of dimensional inspection applications. Fowler baty r14 gxl e horizontal optical comparator with dro as gxl with added optical edge sensor 14 screen 539008011. The mechanical amplification is usually less than 100, but it is multiplied by the optical lens system. The first dietodie inspection tools were manual optical comparators,9 which provided human operators with images that accentuated differences between two features viewed optically. This will provide less chance for magnification and or distortion errors, and provide a better quality image on the optical comparator. Types of comparators are categorized into several kinds, namely electronic, electrical, optical, mechanical, sigma, pneumatic and digital comparators. Depending upon the method of magnification, the comparators are classified as. Now ccp has the worlds largest inventory of preowned optical comparators calibrated and certified by our anab accredited service. When it comes to comparators, there is only one clear choice starrett. In mechanical optical comparators small displacements of the measuring plunger are amplified first by a mechanical system consisting of pivoted levers.
Mechanical comparators are compact and easy to handle. Comparator introduction comparators are one form of linear. Metrology and measurements pdf notes mm pdf notes the metrology and measurements pdf notes mm pdf notes. Insize optical comparators grainger industrial supply. That is the name of the game when it comes to optical comparators. Mechanical optical comparators metrology a beam of light passes through a graticule suitably engraved with a linear scale and the movement of mirror causes this scale to move up or down past a translucent screen inside the observing hood of the instrument. Feb 17, 2017 the johansson mikrokator comparatorunderstand easily. The mechanical amplifying device utilises parallel strip support, consisting of a fixed and a moving block connected together by parallel thin strips.
A mechanical comparator employs mechanical means to get the magnification for example, lever, gear system etc. Compraator of mechanical comparators mechanical comparators have more moving linkages, due to which the friction is more and hence the accuracy is low. The plunger is mounted on a pair of slit diaphragms in order to have friction less linear movement. Vision gauge digital optical comparators have power focus. Explain construction, working, advantages and disadvantages. The vertically positioned vb300 optical comparator models are available with a choice of digital. This comparator utilises both mechanical and optical magnification and thus is a highly sensitive one.
Millimess mechanical dial comparator mahr metrology. May 08, 2020 mechanical optical comparators metrology. There are no pure optical comparators but the instruments are classed as optical comparators to obtain large magnification by the use of optical principles through mechanical magnification in these instruments contribute quite a lot for the overall magnification. The reason comparators havent changed much in 85 years is that the fundamental technology behind an optical comparator is elegantly simple, and it simply works.
The whole system could be explained diagrammatically by fig. Introduction to comparators, their parameters and basic. Starrett optical comparators starrett pdf catalogs. Starrett optical comparators combine mechanical stability with precision optics and versatile lighting to produce bright. They are available in industry standard 5x, 10x, 20x, 50x and 100x optical configurations. Comparator is a measuring device it is used for inspect the dimensioning of the objects. Jan 07, 2018 mechanicaloptical comparator mechanical optical comparator consists of plunger which is attached with lever and a mirror on which the light strikes from the source. All qvi usa facilities will be closed for the thanksgiving holiday from 28 november through 1 december. Vision gauge digital optical comparators and extremely easy to use. Products optical comparatorsoptical comparator models. Pneumatic comparators lecture 3 measurements and metrology 2nd year industrial.
Overall magnification of optical comparators is given as. Optical comparators angle3 0 to 360 12 optical comparators radii3 up to 0. What is advantage and disadvantage of mechanical comparator. This new comparator has the same high quality features as the current product line.
In this system, mechanical amplification l2l1 and optical amplification l4l3 2. See the following diagram of a mechanical optical comparator. Find here online price details of companies selling mechanical comparator. All optical comparators are capable of giving high degree of measuring precision. Mikrokator, sigma comparators, optical comparators. In a comparator, the magnified silhouette of a part is projected upon the screen, and the dimensions and geometry of the part are measured against prescribed limits. Nikon metrologys line of optical comparators feature brighter led illumination with solidstate electronics. All about optical comparators, and why you should avoid. Feb 17, 2017 mechanical optical comparatoreasy way in metrology.
From micrometers to optical comparators, the scherrtumico name continues to be a hallmark of quality around the world. We offer models in different sizes, with horizontal or vertical projection, lenses for magnifications from 5x to 100x, fiberoptic or video. Comparators applications ti offers high performance comparators for a wide variety of automotive, industrial and personal electronic systems. It is a useful item in a small parts machine shop or. Mikrokator type mechanical comparator is a mechanical comparator used for obtaining mechanical magnification. Hence sometimes it is referred as mechoptical comparator.
In recent years, starretts enhanced mechanical designs have combined with an advancement in microprocessor capability to make our current products even. Mechanical comparators engineering tolerance scientific. Optical magnification system provides high degree of measuring precision due to reduction of moving members and better wear resistance qualities. Small displacements of a measuring plunger are initially amplified by a lever mechanism pivoted about a point as shown in figure. Different types of comparators and its applications. Find out what sets starrett comparators apart from the competition. It projects the shadow of an object onto a screen a few feet away and can be compared with a chart showing tolerance levels for the part. Mechanical optical comparators types principle working engineering study materials 1. We are still fully operational, find out more about our operations during covid19. When the application requires a noncontact measurement or equipment size is a concern, the adaptability of an optical comparator is simply unbeatable. Our optical comparators combine mechanical stability with precision optics and versatile lighting to produce bright, sharp images and exceptional accuracy. Mechanical comparator article about mechanical comparator.
Mechanical optical comparators types principle working. Lm393b, lm2903b, lm193, lm293, lm393 and lm2903 dual. In this easytolearn technology, the image of a part is projected on a screen at a precisely known magnification. Advantages of mechanical comparators mechanical comparators are usually cheaper when compared to other amplifying devices. Used optical comparators is a leading provider of high quality, new and preowned optical comparators and vision systems, incorporating the worlds most advanced optics and imaging technology. Jul 22, 2014 optical magnification is also free from friction, bending, wear etc. Mechanical comparator microcator, a measuring instrument whose mechanism is in the form of a tape spring twisted in the middle part, which rotates. Check this selection to find horizontal, vertical and video optical comparators with 10x magnification power in a variety of sizes and illumination types. The mikrokator comparator consists of a twisted thin metal strips to convert plunger small linear movements into pointers large circular movements. In mechanicaloptical comparator, a small dislocation of the measuring plunger is first amplified by a mechanical system comprising of pivoted. Manufactured without compromise, starrett optical comparators provide time tested, cost effective solutions for noncontact measurement. Mechanicaloptical comparators are same as the optical comparators but the plunger in mechanicaloptical comparator will be replaced with the pivoted levers.
Features include a 16 diameter vertical screen, ultrabright leds for longlife illumination, linear encoder scales for 0. As the name of the comparator itself suggests, this is a part mechanical and part optical comparator. Optical comparators offered by fowler high precision. Ccp offers a wide range of certified preowned optical comparators and profile projectors. Vision gauge digital optical comparator optical comparator. An optical comparator often called just a comparator in context or profile projector is a device that applies the principles of optics to the inspection of manufactured parts. Types of comparators with diagram metrology your article library.
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