Journal of the Japan Society of Precision Engineering
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Volume 19, Issue 218
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1953 Volume 19 Issue 218 Pages 175-178
    Published: May 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.175
    JOURNAL FREE ACCESS
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  • Surface of Die-Castings
    Nobuyuki Ohta
    1953 Volume 19 Issue 218 Pages 179-183
    Published: May 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.179
    JOURNAL FREE ACCESS
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    In this report, the alloys as follows are used; (a) Sn-base alloy, (b) Zn-base alloy, (c) Albase alloy, (d) Cu-base alloy. It shows how the surface of die-castings is influenced by specific heat, thermal conductivity, casting temperature, temperature of die, and casting pressure. As to Sn-base alloy, the surface of No. 12 alloy is best, and as to Cu-base alloy, tombasil is better than others. The author shows the relation between the component of alloy and the smoothness of surface in this experiment.
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  • On the Vibration of a Sewing Machine (HB type)
    Genrikuro Nishimura, Koichi Takahashi
    1953 Volume 19 Issue 218 Pages 183-187
    Published: May 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.183
    JOURNAL FREE ACCESS
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    Using a sewing machine of HB type, we studied the unbalance effects of the motions of the machine parts (take-up lever, needle bar, and feed-teeth) on the vibration of the machine arm in its running state without load. Measuring the vibration of the machine, by using a pick-up amplifier, a low frequency amplifier and an oscilloscope, as shown in Fig. 1, we obtained the following facts : (1) When the revolution of the main shaft of the machine becomes large, the vibration amplitude of the machine arm becomes large due to the unbalance effects of the motions of the take-up lever, the needle bar and the feed-teeth respectively. But the :motion of the feed-teeth is not so effective on the vibration of the arm. (2) The vibration amplitude of the arm becomes large as the initial pressure of the pressure-foot becomes large. (3) The vibration amplitude of the arm becomes large when the spring constant of the spring used for the pressure-foot becomes large.
    In the next occasion, we shall study the vibration of the machine in the actual sewing condition.
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  • On a new electrical angular accelerometer
    Koichi Hayakawa, Yoshihide Onishi, Kazuyuki Kurcda
    1953 Volume 19 Issue 218 Pages 187-190
    Published: May 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.187
    JOURNAL FREE ACCESS
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    In order to measure slow variation of angular acceleration, we made a new electrical accelerometer using the mechanism of a conventional watt-hourmeter.
    The sensitivity of our meter is 0.2mv/m/sec2 at the outer edge of rotating disc.
    We applied this instrument to the measurement of accelerations of some gear reduction mechanisms.
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  • Investigations on Milling and Milling Power Guide Chart
    Shigeyoshi Tanaka, Tokio Saito, Yoshitaka Ugawa
    1953 Volume 19 Issue 218 Pages 191-195
    Published: May 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.191
    JOURNAL FREE ACCESS
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    For the purpose of making the milling more effective and economical, the authors investigated the number of teeth, diameter, feed and cutting force of plain milling cutters. Indicating the sele-ctive good conditions for milling, they accomplished the guide chart of roughing, considering various factors important in the milling practice
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  • [title in Japanese]
    [in Japanese]
    1953 Volume 19 Issue 218 Pages 195-200
    Published: May 05, 1953
    Released on J-STAGE: February 16, 2010
    DOIhttps://doi.org/10.2493/jjspe1933.19.195
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1953 Volume 19 Issue 218 Pages 201-204
    Published: May 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.201
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1953 Volume 19 Issue 218 Pages 206-208
    Published: May 05, 1953
    Released on J-STAGE: June 30, 2009
    DOIhttps://doi.org/10.2493/jjspe1933.19.206
    JOURNAL FREE ACCESS
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