Abstract:
A contact probe includes a stylus, a spring, a magnetic body, and a permanent magnet. The stylus is displaceable in an X direction and a tip of the stylus makes contact with a measured object. A first end of the spring is fixated and a second end provides spring force along the X direction. A position of the magnetic body is fixated with respect to the stylus. The permanent magnet is arranged separated from the magnetic body so as to generate a magnetic force along the X direction between the magnetic body and the permanent magnet.
Abstract:
Embodiments of the invention include a method for compensating a force at a probe element of a probing unit. The probing unit being attached to and moved along a defined moving path with a number of moving points by a coordinate measuring machine for approaching a measuring point at an object. The probing unit comprises an actuator which is arranged and designed in such manner that a force is applicable to the probe element with respect to at least one actuating direction in variable and defined manner, the force depending on an applied actuating signal. Movement information about an expected movement of the probing unit is received, the movement information provides information about an expected displacement behaviour of the probe element relative to the probing unit due to induced forces emerging by moving the probing unit.
Abstract:
Embodiments of the invention include a method for compensating a force at a probe element of a probing unit. The probing unit being attached to and moved along a defined moving path with a number of moving points by a coordinate measuring machine for approaching a measuring point at an object. The probing unit comprises an actuator which is arranged and designed in such manner that a force is applicable to the probe element with respect to at least one actuating direction in variable and defined manner, the force depending on an applied actuating signal. Movement information about an expected movement of the probing unit is received, the movement information provides information about an expected displacement behaviour of the probe element relative to the probing unit due to induced forces emerging by moving the probing unit.
Abstract:
A measuring device (10) and method for measuring a surface profile of a workpiece. A measuring carriage (15) is moved in a straight line at a distance from the workpiece surface in a moving direction (x), without accelerating a carried probe tip (25). The free probe end (40) of the probe tip (25) rests on the workpiece surface (11) with a measuring force (Fm) and is deflected during the measurement in a measuring direction (z), transverse to moving direction (x), the surface profile causes a track-dependent deflection (zT) of the probe end (49). A measured value receiver (45) detects the deflecting value (s) describing the deflection of the probe end (40) in measuring direction (z). In an analyzing unit (21), a measuring force change value describing the change of the measuring force (Fm) between the probe end (40) and the workpiece surface (11) is formed for detecting measuring errors/inaccuracies.
Abstract:
A micrometer, including a constant force drive spring actuator configuration, is disclosed which comprises a frame, an anvil, a spindle, a linear displacement sensor that senses a displacement of the spindle, and an actuator including a button which is configured to move the spindle toward or away from the anvil. The spindle drive is attached to a constant force spring actuator comprising at least one constant force spring coil extending toward the spindle and attached between the spindle and the frame such that the sum of their forces drives the spindle toward the anvil with an approximately constant force. In some embodiments, the constant force spring actuator comprises at least two parallel constant force spring coils, extending in parallel toward the spindle. The constant force spring may be made more compact, exert a greater force, and have an extended life relative to known configurations.
Abstract:
In a surface texture measuring instrument, a measurement arm includes: a first measurement arm that is supported by a bracket around a support shaft movably in a circular movement in a casing; and a second measurement arm having styluses that are attachably and detachably provided to an end of the first measurement arm via an attachment-detachment mechanism, the attachment-detachment mechanism being arranged in the casing. A displacement detector includes: a scale provided to the measurement arm; and a detection head provided to the bracket to face the scale. A detecting surface of the scale is on an axis of the measurement arm and on a plane of the circular movement of the measurement arm.
Abstract:
A surface texture measuring instrument includes a force sensor (1), an actuator (11) and a detector (12). The surface texture measuring instrument further includes: a scanning controller (54) that collects a detection signal from the force sensor (1) and drives the actuator such that the detecting signal coincides with a target measurement value; a touch signal generator (51) that generates a touch signal when the detection signal from the force sensor (1) coincides with the target measurement value; and a measurement value collecting unit (55) that collects a measurement value from a counter (26) at a predetermined time interval in a state where a fluctuation range of the detection signal from the force sensor (1) is within a preset range when a scanning controller is in operation, the latch counter (52) collecting a measurement value from a latch counter (52) each time the touch signal is generated in a state where the detection signal from the force sensor (1) oscillates and an amplitude exceeds the preset range.
Abstract:
The object of the present invention is a device for measuring skinfold thickness digitally instrumented for reading the thickness of skin folds and possessing wireless data communication capability with a remote station (for example, a personal computer) in which is installed a software application integrating a database.The developed device utilises working principles distinct from those available in the market, in particular uses a constant force actuator (11) integrated in the device handle (12A), whose primary function is to impose a constant contact pressure between the end tip faces (1A and 1B) and the skinfold under measurement. Another characteristic is related to the increase of the opening limit of the end tips (1A and 1B) by using a large centre distance for the jaws pivot axes, jointly with a cam for compensating the change in the force arm length, the constant force actuator and the orientation mechanism of the clamping faces of the end tips, whereby the application of a constant pressure throughout the whole measuring range is accomplished.
Abstract:
An inside diameter measuring tool includes: a main body; an axially moving spindle having a male screw to be screwed to the main body; a plurality of contact pieces provided on the main body, the measuring pieces moving in a direction substantially orthogonal to the axial direction of the spindle; and a conical member interposed between the contact pieces and the spindle, the conical member advancing and retracting the contact pieces in the direction substantially orthogonal to the axial direction of the spindle. The lead of the male screw of the spindle is 1.0 mm or more and the cone angle of the conical member is less than 53 degrees. Preferably, the lead of the male screw is 2.0 mm and the cone angle of the conical member is approximately 28 degrees.
Abstract:
A surface texture measuring instrument includes a force sensor (1), an actuator (11) and a detector (12). The surface texture measuring instrument further includes: a scanning controller (54) that collects a detection signal from the force sensor (1) and drives the actuator such that the detecting signal coincides with a target measurement value; a touch signal generator (51) that generates a touch signal when the detection signal from the force sensor (1) coincides with the target measurement value; and a measurement value collecting unit (55) that collects a measurement value from a counter (26) at a predetermined time interval in a state where a fluctuation range of the detection signal from the force sensor (1) is within a preset range when a scanning controller is in operation, the latch counter (52) collecting a measurement value from a latch counter (52) each time the touch signal is generated in a state where the detection signal from the force sensor (1) oscillates and an amplitude exceeds the preset range.