Shodikin, Shodikin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Studi Kecermatan Alat Ukur Roundness Tester Machine Produksi Laboratorium Jurusan Teknik Mesin Universitas Riau Dengan Metode Helix Shodikin, Shodikin; Prayitno, Adhy; Arief, Dodi Sofyan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

measuring clock or Dial indicators is a comperator device. typically used in industrial activities in particular at product deviation, because it has good accuracy. Precision and accuracy is the closeness to the true value, can be defined as the closeness (cloness) between the values read from the measuring instrument to the true value. The use of measuring devices which have high accuracy and good will generate accurate measurement data and vice versa use measuring devices that are not good or accurate, then the results obtained are not accurate. This study aims to determine the accuracy of measuring instruments by varying the motor speed to the drive dial indicator with helix methods, and large roundness deviation (Roundness Tester Machine). The result showed that the roundness deviation for each speed roundness of the lowest value and the highest at speed 0,040 m / s is: MCC = 0.008 mm to 0.124 mm, MZC = 0.008 mm to 0.122 mm, MIC = 0.006 mm to 0.029 mm, and LSC = 0.005 to 0.085 mm. Then to the speed of 0.046 m / s roundness deviation obtained MCC = 0.007 mm to 0,186 mm, MZC = 0.005 mm to 127 mm, MIC = 0.005 mm to 0.121 mm, LSC = 0.005 mm to 0,113 mm, while the speed of 0.071 m / s roundness deviation obtained for MCC = 0.094 mm to 0.611 mm, MZC = 0.047 mm to 0,153 mm, MIC = 0,050 mm to 0.107 mm, LSC = 0.042 mm to 0.111 mm, the speed of 0,040 m / s is closer to the data than the speed of other mandrel, the effect of instrument error is evident from the table 4:20 on four very large positions are not accurate Measure tool is e (mm) = 0.0830 or e (%) = 42.17, and the roundness deviation at speed of 0,040 m/s by the largest outer circle the minimum is 0.124 mm, the inner circle is 0.122 mm maximum, the minimum of a circle area is 0.122, and for the least squares circle is 0.042 mm. The fourth circle of reference is used, then the circle of least squares best used to determine the roundness deviation results in accordance recommended ISO.          Keywords : deviation, helix method, Roundness Tester Machine, speed variation.
The Development of Android-based Score Sheet Application for the Referee (Chair Umpire) in Tennis Match Shodikin, Shodikin; Pramono, Harry; Rumini, Rumini
Journal of Physical Education and Sports Articles in Press
Publisher : Journal of Physical Education and Sports

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Abstract

This research is done based on problems that occur in tennis match because they still use manual Score Sheet, so researches interested in conducting research and development of an Android-based score sheet application for the referee (chair umpire). Development being done are the potential and problems, data collection, product design, design validation, design revision, free trial product, free trial usage. Data analysis using a quantitative and qualitative approach. The result of the research on the small scale product validation by tennis referee experts has obtained an average score of 4.5 with category of “very good” and IT experts obtained an average score of 4.2 with category of “good.” While on the validation of large scale product by referees was 4.8 with the category of “very good” and IT experts obtained an average score of 4.7 with the category of “very good.” The final product effectiveness test on a small scale trial was stated “very good” with a percentage of 81.72 % by the referee. While on the large scale trial obtained a percentage of 93.44% by the referee. The conclusions of this research were product development of Android-based score sheet application at tennis match greatly helped the referee’s performance in recording match statistics, Product development of Android-based score sheet application for the referee at tennis match was worthy of being used as mass products.