A compression-vacuum action percussive machine is proposed, which has a casing (1) accommodating a tool (7) and a cylinder (2) with a drive piston (3) and a striker (4) having a chamfer (10) on the end face engageable with the tool (7), and also a means for trapping the striker (4), which means is made in the form of a sleeve (11) with an annular groove (13), wherein a resilient ring (14) is mounted. The sleeve (11) has an inner annular rib (15), the diameter of which is smaller than the diamete...

For an electromechanical machining of a work piece there is an optimal pulse duration for the machining pulses corresponding to the maximum copying accuracy. Such an optimal pulse duration corresponds to a certain value of the gap. By alternating the machining pulses with measurement pulses it is possible to obtain an accurate information about the gap dimensions on-line during the electrochemical machining process. The process control means (20) are used to automate the electromechanical machin...

Method of electrochemically machining an electrically conductive workpiece (2) in an electrolyte by applying bipolar electric pulses between the workpiece (2) and an electrically conductive electrode (6), one or more current pulses of normal polarity alternating with voltage pulses of opposite polarity. The amplitude (Un) of the voltage pulses is adjusted between two predetermined values (Un1, Un2) derived from the occurrence of a given surface quality of the workpiece (2) and the occurrence of ...

A method of electrochemically machining an electrically conductive workpiece in an electrolyte by applying electrical pulses between the workpiece and an electrically conductive electrode, one or more machining pulses alternating with passivation voltage pulses for depositing passivation layers on the workpiece. The amplitude of the passivation voltage pulses is adjusted during an adjustment procedure in which the amplitude of the passivation voltage pulses is increased gradually from zero to th...

A system for classifying eggs according to weight which comprises apparatus incorporating a single weighing device equipped with a weight pick-up and means for determining the respective weight of an egg by a single weighing, including means for generating delay signal pulses and being operatively connected to the output of the weighing device; the delay signal through delay lines being connected to control devices operatively connected to means for directing weight-classified eggs from individu...

A bimetallic rotor is manufactured by incorporating in a mold magnetically conducting metal members separated by spaces and filling the spaces in the mold with a magnetically non-conducting metal. The mold is then heated to a temperature to melt the magnetically non-conducting metal over a period of time for a complete diffusion of the metals. Thereafter the metals are cooled to a temperature at which the magnetically non-conducting metal solidifies with oriented crystallization.