A grinding wheel center hole protection pad is provided, which mainly include a positioning portion attached to the peripheral thereof and the guiding portions disposed at the center hole at the axial center thereof. The guiding portions serve as the isolation layer between the center hole of the grinding wheel and the peripheral plate guiding wall of a flange plate. Therefore, the grinding wheel can be closely attached to the flange plate during the assembling process to decrease eccentricity. Accordingly, it is not necessary to perform the cutting calibration process and balance adjustment by a cutting machine, which can reduce the waste of manpower and material resources.

A measuring instrument disposed on a pipe through which a liquid flows includes two ultrasonic vibrators disposed on an upstream side and a downstream side of the pipe, and an ultrasonic conductor disposed between the ultrasonic vibrators and held in contact with the liquid. The measuring instrument derives the temperature of the liquid in contact with the ultrasonic conductor by generating ultrasonic waves from one of the ultrasonic vibrators and observing the ultrasonic waves propagated through the ultrasonic conductor with the other of the ultrasonic vibrators.

A bonded abrasive article comprises a bonded abrasive matrix. The bonded abrasive matrix comprises, based on the total weight of the bonded abrasive matrix: 10 to 30 weight percent of phenolic binder; abrasive particles retained in the phenolic binder; and from 0.001 to 9 weight percent of ethyl maltol. Methods of making and using are also disclosed.

A backing pad for a power tool having plate-like form and a trapezoid cross-section with a top surface, a larger bottom surface and a slanting circumferential surface connecting the top and bottom surfaces. The backing pad can be connected to a tool shaft of the tool and is adapted for receiving a polishing or sanding material on the bottom surface. The backing pad is provided with a recess and a plurality of holes and channels that creates a predefined air flow between the bottom surface of the backing pad and a working surface. At least one hole ending in an opening is located in an annular outer section of the bottom surface, the annular outer section being located opposite to the slanting circumferential surface of the backing pad. The additional hole is in connection with at least one opening located in the top surface of the backing pad.

This invention relates to abrasive flap discs that include wearable backing plates and methods of making and using such abrasive flap discs and wearable backing plates. The claimed articles, processes, and systems related to the use and manufacturing of such abrasive articles are improved in performance and cost effectiveness.

An abrasive article including a bonded abrasive body coupled to a core, the core includes a composite material including an organic material and a metallic material, and the composite material includes at least a first filler that can include nitrides, carbides, borides, oxides, silicates, or a combination thereof.

An abrasive article including a bonded abrasive body coupled to a core, the core includes a composite material including an organic material and a metallic material, and the composite material includes at least a first filler that can include nitrides, carbides, borides, oxides, silicates, or a combination thereof.

In various embodiments, the present invention provides a structured abrasive article. The structured abrasive article includes an abrasive layer disposed on a backing. The abrasive layer includes shaped abrasive composites, which include abrasive particles dispersed in a polymeric binder. Each of the shaped abrasive composites independently includes a contoured base, which includes a first end disposed on the backing, a second end, and a plurality of sidewalls connecting the first end and the second end. A plurality of walls extends away from the contoured base. The abrasive article additionally includes a grinding surface, which includes a plurality of cusps and a plurality of facets that contact a recessed feature capable of being contained within a geometric plane. A portion of the recessed feature is disposed closer to the contoured base than is each of the cusps, and each cusp is formed by an intersection of two of the walls and a facet.

Polycrystalline ultra-hard constructions comprise a polycrystalline ultra-hard material body and two or more support members attached to the body by braze material. The support members include a backside support member and a side support member. The side support member is a one- or two-piece construction, and is positioned circumferentially around and extends axially along the body or both the body and the backside support member such that a working surface of the body remains exposed. The support members can be configured to provide a mechanical attachment or interlocking attachment with the body or another support member. The braze materials used in the construction can be different and selected to enhance the attachment and/or reduce the creation of thermal stress within the construction during assembly. The support members can be selected having different thermal expansion characteristics that also operate to reduce the thermal stress during construction assembly.

An abrasive article comprising a first group including a plurality of shaped abrasive particles overlying a backing, wherein the plurality of shaped abrasive particles of the first group define a first non-shadowing distribution relative to each other.