3 coordinate are measured machine the radius measuring a ball that measures a head compensates an error

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Since from 1950 British FERRANTI company makes a type of the first number measure a shift 3 coordinate to measure company of OPTON of the machine, Germany before 1973 to finish the three-dimensional design that measure a head to roll out the first 3 coordinate to survey a system with computer form a complete set, through rapid development of a few years, coordinate measures a technology already attain mature, measure precision to get great rise, measure software function more powerful, operation interface is increasingly perfect also, manufacturer home spreads all over the whole world, development went comfortable measure type at the 3 coordinate of different utility. Development of a few years proves adequately, contemporary 3 coordinate measure what the system broke a tradition to measure mode, have general, agile, efficient wait for a characteristic, can finish the measurement of all sorts of complex parts through computer control, in according with mechanical manufacturing industry flexible the need that automation admits, the high accuracy that can satisfy modern production to put forward to measuring a technology, efficient requirement. Except use at dimensional size and form outside the measurement of the error, applied coordinate is measured machine is sophisticated to what unknown learns a model curved surface undertakes metrical, collect the original figure information of complex curved surface, reframe to be measured curved surface, implementation is measured the digitlization of curved surface, it is a when coordinate measures machine application main field not only, also be one of crucial technologies in trying a project instead, also get rapid development in recent years. 1. The classification that measures a head measures a head to regard as measure sensor, it is coordinate measures the very important part in the system. 3 coordinate are measured the work efficiency of machine, precision and measure a head closely related, without advanced measurement first, cannot develop measure the outstanding function of machine. Coordinate measured the development of machine to promote new-style the development that measures a head, new-style the development that measures a head expanded to measure the applied range of machine further again. Press measurement technique, can be the cent that measure a head contact (touch hairdo) with blame contact two kinds big. Touch hairdo to measure a head to be divided again measure head and electric contact to measure a head for mechanical contact; Blame contact measures a head to include first class of head of scanning of optical microscope, TV and laser scanning. The key of article discussion measures a head to touch hairdo. (1) mechanical contact measures head contact to measure a head to be called again " tigidity measures a head " , " measure a head forcedly " , use at commonly " static state " measure, use as osculatory component mostly. This kind measures a head to did not pass feeling system, boundless Cheng, do not send message, it is head of contact of a pure mechanical only. Mechanical contact measures a head to basically be used at the hand to move measure. Because be operated directly artificially, reason measures a head measure force to be controlled not easily, only comfortable at making the measurement of general precision. As a result of its apparent weakness, at present this kind measures a head to already was used rarely. (2) electric contact measures an electric contact to measure a head to be called again " soft measure a head " , comfortable measure at trends. This kind measures a head to regard as measure sensor, it is exclusive the component that contacts with workpiece, when every measure to nod, measure a head to pass move part to always have " contact, deflexion, hair dispatch, reply " process, measure a head measure end and be measured an osculatory hind can make deflection, sensor outputs the signal that imitate displacement measures. This kind measures a head not only can use at aiming at (pass 0 hair question namely) , still can use at measuring small (measure an error that gives coordinate value to be worth namely) . Because this presses its function, electric contact measures a head to be able to be divided again aim at used switch to measure to make head and have measure small function 3 to measure a head. Electric contact measures a head is to be used at present measure a head at most. 2. The radius that measure a ball compensates an error (1) the choice that measures a needle chooses correctly and use measuring a head is to affect coordinate to measure the measurement of machine the main factor of precision. The installation that measure a needle is measuring a head to go up, it is the part that workpiece contacts directly in surveying a system, it and the channel of communication type join that measure a head call spark signal. How to choose the right kind that measure a needle and norms to depend on the feature of the workpiece that be measured, but for love or money, measuring the tigidity of the needle and the ball that measure a ball to spend is indispensable. Industrial the material of pottery and porcelain that ruby is tall hardness, ruby measures a ball to have very good ball to spend, the ball head that the ruby when measuring measures a ball wears away can ignor. Lever of the needle that measure a needle uses lever of non-magnetic stainless steel needle or rod of needle of carbolic tungsten fiber commonly, measure the tigidity of the needle in order to assure. The effective job length that measures a needle (EWL) make the accurate seat that measure a place can be won when workpiece of the contact that measure a needle. Ball head dimension and measure a needle of effective job length choose depend on the workpiece that be measured. Below probable condition, diameter of choice ball head as far as possible big, measuring staff measures a needle shortly as far as possible, in order to assure the biggest ball head / measuring staff is apart from, obtain first-rate effective job length and the tigidity that measure a needle. When need but lengthen measuring staff explores deepness with increasing, but notable is, use lever of the lengthen that measure a needle to be able to reduce tigidity, reduce thereby measure precision. (2) when the radius that measure a ball compensates an error to should measure workpiece of needle bring into contact with, 3 coordinate are measured machine those who receive coordinate value should be coordinate of center of ruby ball head, apparent, measure software will automatic along measure a needle to answer the way that remove to add value of a radius that measure a ball to serve as measured value from osculatory dot. But this measured value is one as inertial as the machine that measures a head concerned dynamic worth. Actually, measure as a dynamic process, its measured value should consider from measure a head to collect a dot to arrive to convey actually this a little bit to the system the machine space shift that when coordinate is worth, produces is apart from. Although this is apart from minimum, but dynamic to systematic computation dimension has certain effect. When be measured actually, every measure an element, the system can distinguish automatically the compensation direction of the radius that measure a ball, computation compensates radius correctly. After collecting a dot to begin, measure software general to go up to undertake to measuring a ball radius is compensated in the direction along workpiece of the contact that measure a needle. But be not by compensation point real osculatory point, measure a head to go up along the extension line of way of work of the contact that measure a needle however one is nodded. Caused compensation error so, the volume that generates an error and the radius that measure a ball and this workpiece are measured the included angle of face and Cartesian reference axis is concerned, included angle is bigger, the error is bigger. 1) R of the radius that measure a ball compensates error δ and R of the radius that measure a ball to become direct ratio concern to compensating the influence of the error, measure ball radius R namely smaller, compensation error δ is smaller also. Because this should use 3 coordinate to measure machine have a place when measuring, should choose spent likelihood to measure a ball smally. 2) the influence to compensating an error becomes the included angle α of the axes that measure a needle and space of law of the surface that be measured the included angle α of the axes that measure a needle and space of law of the surface that be measured is equal to 0 when, δ of error of compensation of the radius that measure a ball also is 0. Accordingly, when measuring, should make the axis that measure a needle as vertical as the surface that be measured as far as possible, make measure a normal direction shift along the surface that be measured, reduce the radius that measure a ball to compensate an error with utmost ground. When measuring element of machine measurement point with 3 coordinate, the radius that measure a ball can appear to compensate an error in measuring software to measure ball radius process in automatic compensation. Through applying referenced coordinate the department searchs workpiece or undertake metrical with CNC mode, make the coordinate that measures a head to collect a place along the normal direction shift of the surface that be measured, can reduce the radius that measure a ball to compensate an error as far as possible, undertake radius is compensated correctly measuring a ball, rise measure precision. CNC Milling CNC Machining