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2022
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WHAT is a GRATING RULER of COORDINATOR MEASURING MACHINE
It is known that any shape is composed of spatial points.And all geometric measurements can be called the measurement of spatial points.Therefore,the accurate collection of spatial point coordinates is the basis for evaluating any geometric shape
It is known that any shape is composed of spatial points.And all geometric measurements can be called the measurement of spatial points.Therefore,the accurate collection of spatial point coordinates is the basis for evaluating any geometric shape.
The basic measuring principle of the coordinator measuring machine is to put the measured part into its allowable measurement space,accurately measure the values of the points on the surface of the measured part in the three coordinate positions of the space,and process the coordinate values of these points via computer data processing,which forms the measurement elements,such as circle,sphere,cylinder,cone,curved surface,etc.and the position tolerance and other geometric data are obtained via mathematical calculation.
For the measuring technology,the grating ruler revolutionized the digitization of dimensional information,which can not only display digitally,but also be used for computer processing of geometric measurement and ultra-high-precision control.
What is a grating ruler of coordinator measuring machine
The grating rulers,also known as grating ruler displacement sensors or grating ruler sensors,are measuring feedback devices which work via using the optical principle of a grating.The grating rulers are used in the closed-loop servo system of the CMM,and can be used for the detection of linear displacement or angular displacement.The output signal is digital pulse with the characteristics of large detection range,high detection accuracy and fast-response speed.The principle of the grating rulers are high-precision displacement sensors which digitally express the linear displacement by the Moiréfringe principle and photoelectric conversion.The grating ruler is made of a reading head,a main ruler and an interface.The glass grating is engraved with light-transmitting and small light-transmitting lines.When the reading head moves,the photoelectric receivers of the interface circuit generate pulse waves respectively.The output electronic signal is subdivided,and the regular fringe pattern of black and white(or light and dark)is generated under the combined action of light interference and diffraction,which is called Moiréfringe.After the photoelectric device is converted into a sine wave changing electrical signal,it is amplified by an amplifier and shaped by a shaping circuit to obtain two sine waves or square waves with a difference,which are sent to the grating digital display for counting and display.
Some routine maintenance tips of grating ruler as below.
1) When using the coordinate measuring machine,attentions should be paid to prevent oil and water pollution,and hard objects from scratching the surface of the grating ruler avoiding the damage the line stripe distribution of the grating ruler and cause measurement errors.
2) The grating displacement sensor should be avoided working severe corrosion,so as not corrode chromium layer and the surface of the grating,and damage the quality of the grating.
3) The grating scale displacement sensor is strictly forbidden to vibrate violently,beat and step on it,so as not to damage the grating scale.If the grating scale is broken,the grating scale sensor will be invalid.
4) Do not disassemble the grating scale displacement sensor,and do not arbitrarily change the relative distance between the main scale and the auxiliary scale,otherwise,the accuracy of the grating scale sensor may be damaged.And the chromium layer will also be damaged,which may cause the grating ruler to be scrapped.
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