Abstract: To provide a traveling crane operation control apparatus and method enabling an operator to operate a traveling crane quickly and accurately by one hand and by a motion of his or her body with a controller worn thereon, without the need to gaze at his or her hand, and also allowing variable-speed control and fine speed control of each drive unit. An operation control apparatus for a traveling crane has an operation control circuit section 1 including a base unit 2 wearable on an arm 4 of an operator and a control unit 3 operable by a hand.

Abstract: To provide a traveling crane operation control apparatus and method enabling an operator to operate a traveling crane quickly and accurately by one hand and by a motion of his or her body with a controller worn thereon, without the need to gaze at his or her hand, and also allowing variable-speed control and fine speed control of each drive unit. An operation control apparatus for a traveling crane has an operation control circuit section 1 including a base unit 2 wearable on an arm 4 of an operator and a control unit 3 operable by a hand.

Abstract: A double-wall structure consisting of an inner wall, an outer wall surrounding said inner wall and reinforcing ribs that connect said outer and inner walls is produced by a piercing welding method in which an electron beam is externally applied at right angles to the outer wall, such that the welded structure of the outer wall and each rib is composed of at least two piercing weld beads that are spaced apart by an unwelded area, with the sum of the widths of the weld beads being at least 25% of the rib width and the length of the unwelded area exterior to the root of each bead being no more than 20% of plate thickness. The distortion in welding is sufficiently reduced to enable precise assembling of the double-wall structure that can be fabricated efficiently and which can reasonably withstand the large electromagnetic force caused by plasma disruption.

Abstract: A rotary table unit having a stationary base element and a table element rotatably mounted on the stationary base element is provided with hydrostatic and hydrodynamic bearing guides forming a composite bearing guide mechanism for enabling smooth and stable rotation of the table element under application of local load to the table element. The rotary table unit is also provided with a main drive motor for rotating the table element and an auxiliary drive motor for supplementing a drive force of the main drive motor in response to a change in load applied to the table element.

Abstract: Disclosed is a method of producing a grinding wheel by electroplating. A part of the outer peripheral portion of a grinding wheel body is immersed in a plating solution. While rotating the grinding wheel body at a low speed, electric current is supplied to flow between an anode disposed in the plating solution and a cathode contacting the grinding wheel body, so that a pre-plating layer of uniform thickness is formed on the outer peripheral surface of the grinding wheel body. Plating operation is continued while adhering abrasive grains to the pre-plating layer to further cause a precipitation of a plating layer to temporarily fix the abrasive grains. The abrasive grains are then pressed by a pressing roller so as to be forcibly embedded into the pre-plating layer by making an effective use of plastic deformation of the pre-plating layer, thereby to obtain a uniform projection height of the abrasive grains from the surface of the grinding wheel.

Abstract: In a machine tool such as a surface grinding machine or the like, a guide mechanism for the machine tool wherein one of a pair of opposed guideways is formed into a hydrodynamic guideway, whilst the other guideway is formed into a hydrostatic guideway, the hydrodynamic guideway is utilized as only one master guide, and on the other hand, the hydrostatic guideway is made to act in such that a moving body is pushed onto the hydrodynamic guideway with a constant pressure, so that this arrangement makes uniform the contact pressure distribution in the hydrodynamic guideway, thus the posture of the moving body is improved thereby making the same to perform precision linear motion.