A method of making a longitudinal reinforcing structure for a wind turbine blade. The method comprises a) providing an elongate master strip (62) of reinforcing material having substantially flat first and second surfaces, the distance between the first and second surfaces defining the thickness of the master strip; and b) dividing the master strip transversely to form a first strip and a shorter master strip, the respective strips being arranged end to end such that a trailing end of the first strip is located adjacent a new leading end of the master strip. The step of dividing the master strip comprises removing material from a dividing region extending through the entire thickness of the master strip, wherein the dividing region is shaped such that a chamfer (19c) at the trailing end (19b) of the first strip is created and a chamfer (63a) at the new leading end (63) of the master strip is created when the master strip is divided.

A method of making a longitudinal reinforcing structure for a wind turbine blade. The method comprises a) providing an elongate master strip (62) of reinforcing material having substantially flat first and second surfaces, the distance between the first and second surfaces defining the thickness of the master strip; and b) dividing the master strip transversely to form a first strip and a shorter master strip, the respective strips being arranged end to end such that a trailing end of the first strip is located adjacent a new leading end of the master strip. The step of dividing the master strip comprises removing material from a dividing region extending through the entire thickness of the master strip, wherein the dividing region is shaped such that a chamfer (19c) at the trailing end (19b) of the first strip is created and a chamfer (63a) at the new leading end (63) of the master strip is created when the master strip is divided.

A portable rasping platform for rasping a top surface of a wall panel includes a plurality of adjustable leveling supports, a pair of support rails, and a drum rasp assembly. The drum rasp assembly includes a drum rasp, a motor coupled to the drum rasp and configured to rotate the drum rasp at a suitable speed, and a truss frame supporting the drum rasp and configured to roll along the pair of support rails. The pair of support rails are configured to be positioned on the plurality of adjustable leveling supports arranged in parallel a certain space apart, and the plurality of adjustable leveling supports are configured to support the wall panel. The drum rasp is configured to pass over and treat the top surface of the wall panel as the drum rasp assembly is displaced along the pair of support rails.

Provided is a method of manufacturing a structure, the method including: a molding step of impregnating the carbon fibers with the resin material and curing the resin material for molding a carbon fiber composite material; a polishing step of polishing a polishing region on a surface of the carbon fiber composite material molded in the molding step, with an abrasive that has a predetermined hardness; and a bonding step of bonding, through an adhesive, another member to a part of the polishing region polished by the polishing step. The molding step forms, in a top layer, a polishing layer that has hardness lower than the predetermined hardness, and forms a surface protective layer that is lower than the polishing layer, protects the carbon fiber composite material from the abrasive, and contains a protective filler having hardness higher than the predetermined hardness.

Provided is a method of manufacturing a structure, the method including: a molding step of impregnating the carbon fibers with the resin material and curing the resin material for molding a carbon fiber composite material; a polishing step of polishing a polishing region on a surface of the carbon fiber composite material molded in the molding step, with an abrasive that has a predetermined hardness; and a bonding step of bonding, through an adhesive, another member to a part of the polishing region polished by the polishing step. The molding step forms, in a top layer, a polishing layer that has hardness lower than the predetermined hardness, and forms a surface protective layer that is lower than the polishing layer, protects the carbon fiber composite material from the abrasive, and contains a protective filler having hardness higher than the predetermined hardness.