Abstract: A welding method for making cladding or buttering on an inner surface of a base material, an inner surface of an opening portion formed in the base material, and the cut surface formed in such a manner that the cut surface is continuous from the inner surface of the base material to the inner surface of the opening portion, wherein the welding method includes a step of forming a protruding portion on the base material in advance, the protruding portion including a temporary welding surface extending toward the center of the opening portion in such a manner that the temporary welding surface is uniformly continuous to the inner surface of the base material and including the cut surface buried therein.

Abstract: A welding method for making cladding or buttering on an inner surface of a base material, an inner surface of an opening portion formed in the base material, and the cut surface formed in such a manner that the cut surface is continuous from the inner surface of the base material to the inner surface of the opening portion, wherein the welding method includes a step of forming a protruding portion on the base material in advance, the protruding portion including a temporary welding surface extending toward the center of the opening portion in such a manner that the temporary welding surface is uniformly continuous to the inner surface of the base material and including the cut surface buried therein.

Abstract: A rotary positioning stage which enables a high speed and high precision positioning. The rotary positioning stage includes an arc-like portion 7a for forming an arc with respect to a rotation shaft 10, a rotary stage 2 on which a workpiece 5 can be mounted, a pulley 12 contacting the arc-like portion 7a, first positioning means 3 for positioning the workpiece 5 by rotating the rotary stage 2 via the pulley 12, second positioning means 4 for positioning the workpiece 5 by slightly moving the first positioning means 3 in a straight line-like manner in a tangent line direction at a contact point between the arc-like portion 7a and the pulley 12, wherein the straight line motion of the first positioning means 3 is converted into a rotational motion of the rotary stage 2 to position the workpiece 5.

Abstract: A rotary positioning stage which enables a high speed and high precision positioning. The rotary positioning stage includes an arc-like portion 7a for forming an arc with respect to a rotation shaft 10, a rotary stage 2 on which a workpiece 5 can be mounted, a pulley 12 contacting the arc-like portion 7a, first positioning means 3 for positioning the workpiece 5 by rotating the rotary stage 2 via the pulley 12, second positioning means 4 for positioning the workpiece 5 by slightly moving the first positioning means 3 in a straight line-like manner in a tangent line direction at a contact point between the arc-like portion 7a and the pulley 12, wherein the straight line motion of the first positioning means 3 is converted into a rotational motion of the rotary stage 2 to position the workpiece 5.

Abstract: In a tool failure detection apparatus for a working machine such as a drilling machine for circuit boards, light is irradiated onto a workable area of a workpiece, and reflection light from the workable area is picked up by an imaging unit to produce a video signal. A video signal indicative of at least either one of a tool image and a worked void image which is picked up within a predetermined region of a picture is sampled to calculate an image area. A comparator compares a calculated image area with a preset reference value indicative of normality of the tool to judge whether the tool is normal or broken.