In order to examine the influence of velocity on the shearing, an Izod-type impact shearing tester was made, in which the specimens are fixed like a canti-lever on the die attached to the frame of tester and sheared by the punch on the pendulum. By this tester, it has become clear that the effect of velocity on the shearing is not so conspicuous, and the impact shearing is qualitatively similar to the static shearing. Consequently, the results of the static tests are also sufficiently useful to the practice.

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The temperature of wheel-work contact surface in the case of carborundum grinding wheel is measured by means of a vacuum-tube potentiometer. The test results do not contradict with the theoretical conclusion published previously by the author. † That is : -
1) The wheel-work interface temperature increases in proportion to Δ063, where 4 is the depth of grind.
2) It also increases in proportion to v^0.26 and V^0.24, where v and V are the work speed and the wheel speed respetively.
As appendices, the heat distribution and chip temperature in the case of plunge-cut grindingare measured to be discussed.
† J. of the Society for Precision Mechanics of Japan; Vol. 19.No.4, April 1953.

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