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Measurement of formation of the piano keyboard

We use the Hanjiang Machine Tool Plant of HJG-D25-type linear guides,[link widoczny dla zalogowanych], the length of 1480ram,[link widoczny dla zalogowanych], straightness ≤ 9gm. 3. Sensor scan test points with straight lines and keys into the production line not parallel to the measurement error: the keys do not pass line scan sensor test points, while the keyboard surface and the horizontal plane is not parallel to the white keys, black keys, respectively, into the horizon of about 7.89 ~ and 9.84 ~ angle, resulting in measurement error; other hand, the calculated change in pads at all the number keys when the fulcrum is in accordance with the white keys and black keys to the test point to the distance of the hinge and calculated ss, When the scan line does not pass the test point, the calculation error is generated. Two of the error of 1,2 system error,[link widoczny dla zalogowanych], can not be eliminated, of which the first two can be the first to measure the straightness of the rail changes, and then using software to compensate for the system, this would reduce the error in item 2. Section 3 of the error by adjusting the position of guide and the keyboard to change. Is calculated to achieve the required accuracy of measurement instruments, the location of the rail between the keyboard (ie sensor scanning lines and the keys do not test the connection point of measurement technology 2000. № 11 parallel) requirements. Required accuracy of measurement instruments in the pivot at a thickness of the thinnest gasket, that is = 0.05ram, from Figure 3 can be, converted into the keyboard test point was: white keys: Ah = s (+ stga) / S-s. 'G black keys: Ah6 = S + S6tg (port + Lo)] / S6 a Sbtg (a + .9) set ss. , S6, S,, Lu were 370mm, 176mm, 322mm,[link widoczny dla zalogowanych], 159mm, 7.89. , I. 95. . '. △ k = 370 × (0.05 +176 tg7.89 ~) / 176-370tg7.89. = 0.1051millAhb = 322 × (0.05 +159 tg9.84 ~) / 159-322tg9.84 *= 0.1012mm assumption (2) of the software error is not compensated, then (1), (2) two errors and ≤ 16.5ttm, white keys and black keys to the test point error were allowed, the white keys: Akd = 0.1051I111111-0.0165mm: 0.0886mm Black Keys: Ak = 0.1O12mm a 0.0165Illlm : 0.0847mm. This error is translated into position between the rail and allows the keyboard error was: white keys; △ = Akjtga = O. 0886mm/tg7.89. = 0.64ram Black Keys: △ Wb = Akb / tg (+ I9) = 0.0847mm/tg9.84. = 0.49mill test the white keys and black keys of the two laser analog sensor measuring the relative position of the head is fixed, so the error in taking the two to allow the smaller, which means that, during the keyboard tests, guide test points with the keyboard tracks are not parallel to ≤ 0.49ram, to ensure that the instrument measurement accuracy to meet the requirements song. 'In addition, the power supply voltage fluctuation, A / D converter circuit, also caused a certain degree of measurement error, but a few less affected than the aforementioned, can be ignored. IV Conclusion instrument development is successful, more than one ill-conceived model of the piano were tested, the results show that: the instrument to meet the practical requirements of measurement accuracy, high stability of repeated measurements. Given in accordance with instrument data (all keys should change the pads pivot at the number) on the keyboard to adjust the two will be able to duplicate keys generally leveling, which is much faster than using a ruler to adjust and tune out Piano consistency. Reference Man Lei. [1] Michan field position sensitive device PSD review its application. Wooden instrument and sensor technology, 1996 2 [2] Yu Shi Liang. Commonly used computer algorithms. Tsinghua University Publishing DU [3] (Japanese) Yoshino new governance sensor circuit design manual. China Metrology Publishing House [4] Y. Wang and so on. IBMPC / XT (Wall 0520) interface technology of wood ugly its application. Nankai University, published in the coordinate measuring Du AutoCAD application practice in the field of g, eighteen Abstract /,. New recognition f1 / lay off the word L / / turtle sit cross-legged (China First Automobile Group Corporation, Changchun 130011) D B D body j7 / 7 This article describes the field of AutoCAD application of coordinate measuring exploration experience, so you have AutoCAD There is a range of applications,[link widoczny dla zalogowanych], Preface. Light field in the CAD, AutoCAD development is more mature and perfect, it has been widely applied to modern industrial design, manufacturing and testing and other fields. This paper attempts a few simple and practical example to illustrate the AutoCAD for

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