The present invention relates generally to the field of orthopedics, and more particularly to a pelvic referencing guide and methods of using the guide in orthopaedic surgery, specifically total hip arthroplasty.

A compressor variable angle measurement system for guiding the positioning variable vanes supported on a penny of a compressor of a gas turbine engine. The system comprising a gauge assembly that is connectable to a computing device. the gauge assembly comprises a base plate and a clamp arm. The gauge assembly is configured to removably grip a variable vane between three vane contact portions of the baseplate and the vane contact portion of the clamp arm and on the leading edge vane engaging portion and the trailing edge vane engaging portion of the base plate, the stagger angle of the variable vane with respect to the radial setting pin being determined by the computing device from measurements made by an inertial measurement unit.

A tool includes a first body portion having opposite first and second recesses facing toward one another about a space, wherein the opposite first and second recesses are configured to contact opposite sides of a first component disposed in the space. The tool includes a second body portion configured to rotate relative to the first body portion, wherein the second body portion is configured to contact a reference surface relative to the first component. The tool further includes an angle meter configured to measure an angle of the first component based on an angular position of the second body portion relative to the first body portion.

A tool includes a first body portion having opposite first and second recesses facing toward one another about a space, wherein the opposite first and second recesses are configured to contact opposite sides of a first component disposed in the space. The tool includes a second body portion configured to rotate relative to the first body portion, wherein the second body portion is configured to contact a reference surface relative to the first component. The tool further includes an angle meter configured to measure an angle of the first component based on an angular position of the second body portion relative to the first body portion.

The disclosure relates to a method for determining a sharpness condition of a saw chain of a chain saw. The saw chain includes at least one cutting link having an upper cutting blade. An upper cutting blade image of the upper cutting blade of the cutting link is recorded using an imaging device. An evaluation of the upper cutting blade image is performed using an evaluation unit, which includes an artificial neural network. A sharp condition and a dull condition of the saw chain are defined in the evaluation unit. The saw chain is assigned on the basis of the upper cutting blade image using the artificial neural network to the sharp condition or the dull condition.

The disclosure relates to a method for determining a sharpness condition of a saw chain of a chain saw. The saw chain includes at least one cutting link having an upper cutting blade. An upper cutting blade image of the upper cutting blade of the cutting link is recorded using an imaging device. An evaluation of the upper cutting blade image is performed using an evaluation unit, which includes an artificial neural network. A sharp condition and a dull condition of the saw chain are defined in the evaluation unit. The saw chain is assigned on the basis of the upper cutting blade image using the artificial neural network to the sharp condition or the dull condition.

A controller (1) to reduce integral non-linearity errors of a magnetic rotary encoder (2) comprises a position error determining unit (20) to determine a plurality of time marks (P0, . . . , Pk) specifying a respective time at which a moving device (3) reaches a respective one of predefined positions (α0, . . . , αk). The position error determining unit (20) calculates a plurality of error correction parameters (B[0], . . . , B[k]) in dependence on the time marks (P0, . . . , Pk). An error compensation unit (10) of the controller determines a respective error compensated position parameter (φ.sub.start.sub._comp, φ0_comp, . . . , φn_comp) for each position parameter (φ.sub.start, φ0, . . . , φn) received from the encoder (2) in dependence on the respective position parameter (φ.sub.start, φ0, . . . , φn) and the respective error correction parameter (B[0], . . . , B[k]).

An angle measurement apparatus for use with a panel such as siding is provided. The apparatus includes a base portion defining a locating feature that is engageable with a reference feature on the panel. An arm portion is rotatably mounted with respect to the base portion such that the arm portion is selectively rotatable with respect to the base portion about an axis. The arm portion can thus be rotated to form a desired angle with the base portion, and, correspondingly, with the panel.

An angle measurement apparatus for use with a panel such as siding is provided. The apparatus includes a base portion defining a locating feature that is engageable with a reference feature on the panel. An arm portion is rotatably mounted with respect to the base portion such that the arm portion is selectively rotatable with respect to the base portion about an axis. The arm portion can thus be rotated to form a desired angle with the base portion, and, correspondingly, with the panel.

Provided is a working machine including first and second members, an angle detection device and a connection pin connected to the first and second members to rotate integrally with the second member relative to the first member. The angle detection device has a marker, an angle sensor and a guard member, which has a main guard portion covering the angle sensor and including an inner opposite surface opposed to an end surface of the projecting end portion and a guard-member-side engagement portion. One of the angle sensor and the marker is disposed on the inner opposite surface, the other disposed on the end surface. The first member has a first-member-side engagement portion engaging with the guard-member-side engagement portion to restrain the main guard portion from relative rotation. The guard member can contact with the connection pin to restrain the guard member from relative displacement to the projecting end portion.