This paper is written to describe the accuracy of ferreite cores which were mass-produced by ultrasonic machining. The result shows that the accuracy becomes lower according to the number of the times of regrinding of horns.

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This paper describes what is the proper design of an automatic contour-following machine using pneumatic-hydraulic control element.
The method of analysis is based upon the general idea of frequency response method and some data for evaluating the regulation properties of this system were obtained.
The part I deals with the characteristics of the single pneumatic element in this system and basic relations among these elements are pointed out.

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he test pieces were cylindrical glass blocks, and the polishing material was SeO₂ powder on a pitch plate. The experiments were made to find its polishing ability and many other factors, such as pressure, temperature, abrasive density and its supplying methods. The rate of polish was measured by the amount of reflected light.
The polishing ability increased according to the pressure (540g/cm²) and temperature (10° 30°C), and the maximum of polishing ability is found at about 10g SeO₂/100cc water.
In these experiments the next conditions were suitable at 20°C.
1. The density of abrasives was 10g/100cc (water).
2. The pressure of work was 10g/cm².
The supply of abrasives was made once or twice. The matters of great importance are density of abrasives and how the pitch plate preserves abrasive grains.

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The standard for contact pressure of dial gauges was established, but as to the standard for the effect of the friction force we have not yet.
We performed a few experiments and theoretical investigations to measure the representative value of the friction, and we showed a simple method to suggest that value. According to these results, it must be noted that there is not always t he one-to-one relation between the reading and the contcat pressure when the dial gauge is used to find the displacement of a body having comparatively small spring coefficient, and furthermore that these cumbersome facts are also produced by the friction represented in the form of a “Stich-Ship Motion”.

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The faults of present finishing method for carpenters' gimlet (screw auger) are the deformation of spiral edge by grinding, the formation of scale on induction screw and the colouring on edge parts by quenching, etc. After the preliminary experiment, we succeed in eliminating the above faults as well as in increasing the anti-corrosivity and sharpness by applying electrolytic polishing as final finishing.
This report states about (1) trial manufacture of apparatus for mass production (2) various data of experiments (3) producing quantity and cost, for the purpose of industrialization of this method and clarifies that electrolytic polishing is industrially a proper method.

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In this paper, the author presents an analytical formula for the surface roughness in flat superfinishing on the assumption that the deformation is ideally plastic and the paths of abrasive grits on the work remain as they are. In this case only the cutting process is considered excepting the mirror finishing process. Further, he measures the surface roughness by a reflection method (NF roughness) and discusses the formula with reference to some experimental results.

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