A procedure defining a balancing strategy includes: providing a computer model which predicts the vibration amplitude at a given axial position along the spool when the spool is rotated at a given rotational speed; using the model to predict respective vibration amplitudes at the given axial position for different axial positions of a unit unbalance applied to the spool; plotting the predicted vibration amplitudes as data points on a graph of vibration amplitude against axial position of the applied unit unbalance; using the graph to identify axial positions which are more or less likely to contribute to flexing of the spool at the given rotational speed when mass is added or removed from the first rotor module to reduce imbalances at the axial positions; and defining a balancing strategy based on the identification.

This invention relates to both process and tooling for machining exemplary Hamilton Sundstrand 7111 and 7121 aircraft propeller blade taper bores, or equivalent to comply with government and or industry standards or specifications for such refurbishment. The tooling and process invented are an Improvement over previous and current taper bore machining methods in improved repeatability and cost effectiveness, as this machining method can quickly and repeatedly machine propeller blades to meet fit, form, and function requirements. The process makes use of a specially constructed horizontal mill, specially constructed blade-holding fixture, specially constructed probing system, specially constructed reamers, and specially constructed air gauges. A blade holding fixture assembly including a base plate, a blade holding fixture and a blade alignment fixture hold an aircraft propeller blade in a horizontal milling machine for refurbishment of the taper bores. Refurbishment includes reaming shot peened surfaces, testing the reamed surfaces with an air gauge and a fluorescent penetrant emersion fixture.

This invention relates to both process and tooling for machining exemplary Hamilton Sundstrand 7111 and 7121 aircraft propeller blade taper bores, or equivalent to comply with government and or industry standards or specifications for such refurbishment. The tooling and process invented are an Improvement over previous and current taper bore machining methods in improved repeatability and cost effectiveness, as this machining method can quickly and repeatedly machine propeller blades to meet fit, form, and function requirements. The process makes use of a specially constructed horizontal mill, specially constructed blade-holding fixture, specially constructed probing system, specially constructed reamers, and specially constructed air gauges. A blade holding fixture assembly including a base plate, a blade holding fixture and a blade alignment fixture hold an aircraft propeller blade in a horizontal milling machine for refurbishment of the taper bores. Refurbishment includes reaming shot peened surfaces, testing the reamed surfaces with an air gauge and a fluorescent penetrant emersion fixture.

A vehicle wheel buffing stand has a first side support frame and a second side support frame spaced from the first side support frame. A first roller extends between the first side support frame and the second side support frame and the first roller is operably connected to the first side support frame and the second side support frame. A second roller extends between the first side support frame and the second side support frame, and the second roller is operably connected to the first side support frame and the second side support frame. The second roller is spaced from the first roller. The stand is configured to receive a vehicle wheel wherein the first roller and the second roller are configured to engage the vehicle wheel and rotatably support the vehicle wheel wherein an operator can rotate the vehicle wheel via rotation of the first roller and the second roller and to prepare surfaces of the vehicle wheel in preparation for mounting a tire on the vehicle wheel.

A vehicle wheel buffing stand has a first side support frame and a second side support frame spaced from the first side support frame. A first roller extends between the first side support frame and the second side support frame and the first roller is operably connected to the first side support frame and the second side support frame. A second roller extends between the first side support frame and the second side support frame, and the second roller is operably connected to the first side support frame and the second side support frame. The second roller is spaced from the first roller. The stand is configured to receive a vehicle wheel wherein the first roller and the second roller are configured to engage the vehicle wheel and rotatably support the vehicle wheel wherein an operator can rotate the vehicle wheel via rotation of the first roller and the second roller and to prepare surfaces of the vehicle wheel in preparation for mounting a tire on the vehicle wheel.

A method for balancing disc blades comprising the steps of: determining the initial position of the center of mass of the disc blade to be balanced with respect to its main axis; calculating/determining the number, the position and/or the dimensions of one or more balancing holes eccentric with respect to said main axis and necessary for removing an amount of material sufficient to bring the center of mass of the disc blade at a distance from the main axis lower than a predetermined maximum limit value; and forming said balancing hole or holes on the central disc in an eccentric position with respect to said main axis.

A method for balancing disc blades comprising the steps of: determining the initial position of the center of mass of the disc blade to be balanced with respect to its main axis; calculating/determining the number, the position and/or the dimensions of one or more balancing holes eccentric with respect to said main axis and necessary for removing an amount of material sufficient to bring the center of mass of the disc blade at a distance from the main axis lower than a predetermined maximum limit value; and forming said balancing hole or holes on the central disc in an eccentric position with respect to said main axis.

Disclosed is a method for balancing the out-of-balance of a shaft/wheel assembly. The balancing method involves a step of measuring the value of the out-of-balance of a wheel/shaft assembly with respect to a longitudinal axis of the mechanical shaft, and then measuring the position of at least two different target zones present on the surface of the wheel. The method involves removing material from the surface of the vaned wheel in order to reduce the value of the out-of-balance of the shaft/wheel assembly depending on the measurements taken in steps a) and b). In this way, the balancing method is much more precise compared with the prior art.

Disclosed is a method for balancing the out-of-balance of a shaft/wheel assembly. The balancing method involves a step of measuring the value of the out-of-balance of a wheel/shaft assembly with respect to a longitudinal axis of the mechanical shaft, and then measuring the position of at least two different target zones present on the surface of the wheel. The method involves removing material from the surface of the vaned wheel in order to reduce the value of the out-of-balance of the shaft/wheel assembly depending on the measurements taken in steps a) and b). In this way, the balancing method is much more precise compared with the prior art.

Disclosed is a method for balancing the out-of-balance of a shaft/wheel assembly. The balancing method involves a step of measuring the value of the out-of-balance of a wheel/shaft assembly with respect to a longitudinal axis of the mechanical shaft, and then measuring the position of at least two different target zones present on the surface of the wheel. The method involves removing material from the surface of the vaned wheel in order to reduce the value of the out-of-balance of the shaft/wheel assembly depending on the measurements taken in steps a) and b). In this way, the balancing method is much more precise compared with the prior art.