Abstract: The top portion of a material for a rail of a linear guide is formed in a convex shape. In this convex shape, portions protruding to the side of a top surface are removed beforehand by rolling raceway grooves in side portions of a member of rectangular section, the top surface of which is flat. A rail made from this material by rolling raceway grooves in side portions have a flat top surface.

Abstract: The top portion of a material for a rail of a linear guide is formed in a convex shape. In this convex shape, portions protruding to the side of a top surface are removed beforehand by rolling raceway grooves in side portions of a member of rectangular section, the top surface of which is flat. A rail made from this material by rolling raceway grooves in side portions have a flat top surface.

Abstract: A process of manufacturing a rail of a linear guide is described. The process includes preparing a material for a rail wherein the material has a surface formed in a convex shap and two side surface. The method includes a rolling process of forming raceway grooves in the side surfaces of the material and a process for making a mounting hole after the rolling process in such a manner that the mounting hole opens to at least either surface.

Abstract: When working a linear guide rail having one or more raceway grooves 2 on the side surfaces thereof, using rotary dies each including on the circumferential portion thereof a projection-shaped working portion matched in shape to the raceway groove 2, the raceway grooves 2 are rolled onto a rail blank work W. Since the raceway grooves 2 can be rolled with high accuracy by a single working step, the working time of the raceway grooves as well as the working cost thereof can be reduced.

Abstract: The top portion of a material for a rail of a linear guide is formed in a convex shape. In this convex shape, portions protruding to the side of a top surface are removed beforehand by rolling raceway grooves in side portions of a member of rectangular section, the top surface of which is flat. A rail made from this material by rolling raceway grooves in side portions have a flat top surface.

Abstract: The top portion of a material for a rail of a linear guide is formed in a convex shape. In this convex shape, portions protruding to the side of a top surface are removed beforehand by rolling raceway grooves in side portions of a member of rectangular section, the top surface of which is flat. A rail made from this material by rolling raceway grooves in side portions have a flat top surface.

Abstract: When working a linear guide rail having one or more raceway grooves 2 on the side surfaces thereof, using rotary dies each including on the circumferential portion thereof a projection-shaped working portion matched in shape to the raceway groove 2, the raceway grooves 2 are rolled onto a rail blank work W. Since the raceway grooves 2 can be rolled with high accuracy by a single working step, the working time of the raceway grooves as well as the working cost thereof can be reduced.

Abstract: When working a linear guide rail having one or more raceway grooves 2 on the side surfaces thereof, using rotary dies each including on the circumferential portion thereof a projection-shaped working portion matched in shape to the raceway groove 2, the raceway grooves 2 are rolled onto a rail blank work W. Since the raceway grooves 2 can be rolled with high accuracy by a single working step, the working time of the raceway grooves as well as the working cost thereof can be reduced.

Abstract: When working a linear guide rail having one or more raceway grooves 2 on the side surfaces thereof, using rotary dies each including on the circumferential portion thereof a projection-shaped working portion matched in shape to the raceway groove 2, the raceway grooves 2 are rolled onto a rail blank work W. Since the raceway grooves 2 can be rolled with high accuracy by a single working step, the working time of the raceway grooves as well as the working cost thereof can be reduced.

Abstract: A sphere polisher capable of making uniform conditions under which balls are polished is provided. The inner and outer polishing circuits are defined by the grooves 23 provided on the rotative disc 10 and the fixed disc 20. The storage conveyor 50 is provided with an outer ball guiding passage 55 and an inner ball guiding passage 56. The ball supply chute 57 is provided with the inner chute portion 57a connecting the inner polishing circuits with the outer ball guiding passage 55, and the outer chute portion 57b connecting the outer polishing circuits with the inner ball guiding passage 56. The ball discharge chute 58 is provided with the inner discharge chute portion 58a connecting the inner polishing circuits with the inner ball guiding passage 56, and the outer discharge chute portion 58b connecting the outer polishing circuits with the outer ball guiding passage 57.

Abstract: In measuring the accuracy of a thread groove of a ball thread formed in a nut by using an electric micrometer, a displacement of one point on each of a pair of flanks of the thread groove is measured along a longitudinal direction of the thread groove, and a pair of measured data sequences are obtained respectively for the pair of flanks. The data elements of the pair of measured data sequences are grouped into a plurality of groups so that each group includes a pair of data elements which are respectively contained in the pair of measured data sequences and which are corresponding to each other. The accuracy in the depth direction of the thread groove with respect to a reference thread groove is obtained on the basis of a sum of the data elements in each group, and the accuracy in the thread axis direction is obtained on the basis of a difference between the data elements in each pair.