In colliding and sliding steady-state motion the retard pallet and star wheel repeatedly collide each other with continuously decreasing rebound until they start moving, unaccompanied by rebound and kept in contact continuously. An approximate method, presented in this report, may be used in lieu of the exact one with reasonable accuracy to predict the performance of the mechanism. Two different approaches are made to the exact determination of the pattern of motion; namely, the iteration method and the application of a linear difference equation.
As the moment-of-inertia rat.o further increases, a different pattern of motion is encountered, in which the retard pallet works as a brake, and intermittently brings the star wheel to a stop at the points where the former penetrates deeply into the latter between its two adjoining teeth. This is designated as the stop-and-slide steady-state motion. Only an approximate method is developed for the motlon of this kind, since actually this pattern of motion is too complicated and diversified for rlgorous analysis.

View full abstract

Grinding under ordinary conditions is always accompanied by an increasing flank wear of grain cutting edges on a surface of a grinding wheel. Process of the increase in the flank wear was experimentally investigated in surface grinding. It was found that the grinding performance of a wheel suddenly deteroirates when the fractional area of flank wear to the working area of a grinding wheel comes to about 8%. From this fact, a tool life of a grinding wheel was defined by the fractional area of flank wear. The effects of mechanical conditions and hardness of grinding wheel on the process of the flank wear and the tool life were studied. Those experimental studies led to a conclusion that the lower wheel speed, the higher work speed and the softer grinding wheel, the longer the tool life is made. Further, the process of flank wear is discussed in due consideration of the wear mechanism of a grinding wheel.

View full abstract

From a new stand point we defined the measure of roundness corresponded to the amount of approach to true circle by introducing the conception of information theory, and compared this new measure with that of the former absolute roundness.
The characteristics of the new defined roundness are as follows.
(1) The measured value is regarded as sampling function from ensemble.
(2) The number of measuring points by setting up band limit of irregular circle is decided.
(3) The factor of error is contained.
(4) By quantitative expression of the amount of approach to circle, the comparison of data becomes possible.
(5) In the mass production of mechanical parts of cylinder or ball shape, a new standard of judgement of quality is given.
(6) This thinking method is extended to the definition of sphericity.

View full abstract