Journal of the Japan Society of Precision Engineering

On Checking Grinding Wheels by Means of Measuring the Back Scattering of β-ray

Tomonobu SHONOZAKI, Hidemi SHIGEMATSU

1967 Volume 33 Issue 392 Pages 580-586
Published: September 05, 1967
Released on J-STAGE: February 16, 2010

DOIhttps://doi.org/10.2493/jjspe1933.33.580

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The present paper deals with the experiments that the back scattering of grinding wheel change considerably by the different kinds of wheels and conditions of wheel surface.
The results obtained are as follows:
(1) The back scattering of β-ray changes corresponds to the respective grade of the five factors of the grinding wheel, leading to the possibility for checking the wheel by measuring the back scattering.
(2) If the abrasive grain, bond and pore are distributed irregularly in the test wheel, the values of back scattering at the different places of the wheel surface, deviate remarkably from the mean value, but in the case of the uniform wheel, the values of back scattering are stable, therefore this measuring method can detect the rejected wheel.

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Lapping Characteristics of Forsterite with Diamond Abrasives

Abrasive Machining of Ceramics (3)

Ichiro IDA, Mitsuo KAJITA, Yuzo ARAI, Makoto SUZUKI

1967 Volume 33 Issue 392 Pages 587-592
Published: September 05, 1967
Released on J-STAGE: February 16, 2010

DOIhttps://doi.org/10.2493/jjspe1933.33.587

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As a part of precision finishing of ceramics for circuit components, forsterite is lapped with 6-12μ diamond abrasives using a rotary disc type lapping tester concerning lapping quantity, lapping force and surface roughness with discussions on lapping mechanism from abrasive numbers acting simultaneously and scratching force. The results obtained are as follows : (1) The influence of lapping speed is greater on lapping quantity and surface roughness than that of lapping pressure, leading to the smaller effect of depth of cut in abrasive grains. (2) Numbers of abrasives acting simultaneously are calculated as about 1/500-1/1000 of those of ideally distributed ones. (3) Lapping force is derived from the sum of scratching and ploughing forces as 73-280g, which is considerably approximate to the empirical one.

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Inharmonicity of Coupled Vibration of a Piano String and a Soundboard

Takeshi YANAGISAWA, Mikio MORIOKA, Kijuro NAKAMURA

1967 Volume 33 Issue 392 Pages 593-599
Published: September 05, 1967
Released on J-STAGE: February 15, 2010

DOIhttps://doi.org/10.2493/jjspe1933.33.593

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This paper describes inharmonicities of a piano string vibration. Inharmonicities δ_on are first measured with a soundboard fixed and then inharmonicities δ_n with a soundboard unfixed. The latter are larger in a bass section than the former, and in mediant and treble sections there is no difference between the two. The vibration of a piano string is not interpreted as independent vibration, but as coupled vibration. Theoretical treatment of coupled vibration of a string with the soundboard leads to the following solution.
δ_n-δ_on=1200 log₂(1+ε_n-ε₁)
_??_1731(ε_n-ε₁) [cent]
and ε_n_??_(n²π²M/ρl-kl/T)^-1
where M ; the equivalent mass of a soundboard
k ; the spring constant of a soundboard
ρ; the linear density of the spring
T ; the tension of the string l; the speaking length of the string,
The above experimental facts are well explained by these theoretical calculations.

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On the Determination of the Absolute Value of Diagonal Length of Vickers Indentation

Namiterum HIDA

1967 Volume 33 Issue 392 Pages 600-605
Published: September 05, 1967
Released on J-STAGE: February 16, 2010

DOIhttps://doi.org/10.2493/jjspe1933.33.600

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At the determination of standard Vickers hardness number, it is one of the most important problem that the diagonal lengths of indentations are determined accuratly, but the absolute length can not be obtained by the ordinary measuring principles.
A new method has been found to determine their absolute values. In this method, the relation between the test load pi and the measured value of diagonal length dij, in which the personal error βj is involved, is given by the following formula;-
dij-βj = (2sin θ/2/H_v) ^1/2pi^1/n
where θ is the angle included between opposite Faces of Vickers indenter, and H_v is the invariable Vickers hardness of a specimen, and 1/n is a parameter which gives the hardness dependency of the material to indentation load.
The experimental data are verified in conformity to the above formula by using the regression analysis, and thus the absolute value of diagonal length and personal error are estimated by the aid of the least mean square method, and it becomes possible that both the absolute length and individual personal error can be determined with the accuracy of about 0.15μm at confidence coefficient of 95%.

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Single-Flank Mesh Tester of Torsional Vibrometer for Miniature Gear

Genrokuro NISHIMURA, Yasuo JIMBO, Masaharu TAKANO

1967 Volume 33 Issue 392 Pages 606-612
Published: September 05, 1967
Released on J-STAGE: February 16, 2010

DOIhttps://doi.org/10.2493/jjspe1933.33.606

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According to the principle that the mesh error of a pair of gears can be measured by subtracting the irregurarity of rotation of one gear from that of another gear, a single flank mesh tester of minilature gears is produced by applying a torsional vibrometer of long natural period and small size.
This tester can measure the mesh error of the gears with 0150mm center distance and face width of 030mm. Two torsional vibrometers of the same type are used, each of which is 80φ × 90 large, 800g weight and has 4s natural period. The total sensibility from vibrometer to recorder, where the signal is electrically amplified, is 10^-4rad mm (20''/mm). In order to investigate the reliability of the tester for measuring the gear mesh error of miniature gears, the mesh test of the gears with known errors is proceeded, and it is found that the mesh error can be obtained with good exactness provided that tooth contact is not apart by taking the load of gears effectively large or by lowering the angular velocity and that the mesh period of time is at most half the natural period of vibrometer. Few examples of mesh test of small size gears obtained by this tester are shown in this paper.

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[title in Japanese]

[in Japanese]

1967 Volume 33 Issue 392 Pages 613
Published: September 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.613

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Erratum to : Effects of Cutting Fluid on Machining High Silicon Aluminum Alloys

1967 Volume 33 Issue 392 Pages 613a
Published: 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.392_613a

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Erratum to : A Method of Evaluation of Cutting Fluid Efficiency by the Chips

1967 Volume 33 Issue 392 Pages 613b
Published: 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.392_613b

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[title in Japanese]

[in Japanese], [in Japanese]

1967 Volume 33 Issue 392 Pages 614-618
Published: September 05, 1967
Released on J-STAGE: June 30, 2009

DOIhttps://doi.org/10.2493/jjspe1933.33.614

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