Abstract: A gas turbine engine comprises a compressor driven by a shaft, and a reference starting schedule, the compressor having a reference stability boundary, with the reference starting schedule defining a reference working line. A method of starting the gas turbine engine is described in which the method comprises the steps of: (i) accelerating the rotational speed of the shaft towards an engine idle speed; (ii) defining for the compressor, as the rotational speed increases, an operational working line; and (iii) modifying at least one operating parameter of the gas turbine engine as the rotational speed increases such that for a rotational speed, an operational working line is closer to the reference stability boundary than the reference working line is to the reference stability boundary.

Abstract: An abrasive article in form of an abrasive wheel comprising a core and a bonded abrasive body disposed within an interior recess of a peripheral surface of a core. The core comprises a polymer material and has an HDT at 0.45 MPa of at least about 130° C., and a low shrinkage ratio.

Abstract: An abrasive article in form of an abrasive wheel comprising a core and a bonded abrasive body disposed within an interior recess of a peripheral surface of a core. The core comprises a polymer material and has an HDT at 0.45 MPa of at least about 130° C., and a low shrinkage ratio.

Abstract: A grinding wheel is suited for shaping glass, notably glass that is less than or equal to 4 mm thick. This grinding wheel has at least one abrasive portion formed of at least one metal binder and of diamonds distributed in the binder. The binder has a Rockwell B hardness of between 95 and 105 and is tungsten-based. The diamonds have a size of between 75 and 95 ?m and a concentration of between 2.2 ct/cm3 and 2.64 ct/cm3. Glass, in particular for shaping motor-vehicle glazing units, can be shaped with this grinding wheel, making it possible to achieve travel speeds greater than or equal to 30 m/min.

Abstract: A grinding tool includes a shank having an axis, and at least two abrasive portions mounted directly to and in contact with the shank without a hub therebetween. Each of the abrasive portions has a substantially identical profile formed therein.

Abstract: An abrasive tool is provided that may include a body, which may include abrasive particles contained within a bond material. The abrasive particles may be a super abrasive material. The body may further include at least one of a ratio of tungsten to cast iron (W/CI) of not greater than about 1, a ratio of copper-containing compositions to cast iron (CCC/CI) of not greater than about 1, a ratio of titanium-containing compositions to cast-iron (TiCC/CI) of not greater than about 1, a ratio of tungsten carbide to cast iron (WC/CI) of not greater than about 1, a ratio of tungsten carbide to copper-containing compositions (WC/CCC) of not greater than about 1, a ratio of copper-containing compositions and titanium-containing compositions to cast iron ((CCC+TiC)/CI) of not greater than about 1.5 or a combination thereof.

Abstract: A grinding wheel is suited for shaping glass, notably glass that is less than or equal to 4 mm thick. This grinding wheel has at least one abrasive portion formed of at least one metal binder and of diamonds distributed in the binder. The binder has a Rockwell B hardness of between 95 and 105 and is tungsten-based. The diamonds have a size of between 75 and 95 ?m and a concentration of between 2.2 ct/cm3 and 2.64 ct/cm3. Glass, in particular for shaping motor-vehicle glazing units, can be shaped with this grinding wheel, making it possible to achieve travel speeds greater than or equal to 30 m/min.

Abstract: A grinding tool and method is provided for shaping an edge of sheet glass. The grinding tool includes an arbor and a wheel being of a unitary construction and including an axis of rotation. The grinding tool further includes a recess extending along a periphery of the wheel, with a bonded abrasive being disposed therein. The bonded abrasive is sized and shaped for being profiled, to shape an edge of a glass sheet upon rotation of the tool about the axis. The bonded abrasive may further be sized and shaped for being re-profiled after use. The grinding tool of this invention may provide for both improved quality and reduced cost sheet glass.

Abstract: A grinding tool and method is provided for shaping an edge of sheet glass. The grinding tool includes an arbor and a wheel being of a unitary construction and including an axis of rotation. The grinding tool further includes a recess extending along a periphery of the wheel, with a bonded abrasive being disposed therein. The bonded abrasive is sized and shaped for being profiled, to shape an edge of a glass sheet upon rotation of the tool about the axis. The bonded abrasive may further be sized and shaped for being re-profiled after use. The grinding tool of this invention may provide for both improved quality and reduced cost sheet glass.

Abstract: A grinding wheel for use in grinding glass, has an outer periphery of abrasive material secured to a body portion made of a lightweight material.