摘要:
This invention provides a low-cost coordinate measuring instrument which has stable measurement accuracy and can keep straightness of an X guide (52C) constant. Guide members need not be fitted individually to a measurement table (64) because an upper surface and both side surfaces of the measurement table (64) are used as guide faces. A gap is secured between an extension end of a side air pad support member (55) and a lower part of the other column (52B) so that the extension end and the lower part of the other column (52B) are not interconnected, and thermal expansion/contraction of the side air pad support members (66, 70) in an X-axis direction is not transmitted through columns (52A, 52B) to the X guide (52C). Accordingly, the X guide (52C) does not undergo deformation.
摘要:
The multi-coordinate contact measuring device has a contact arm (7) which can be moved towards a main coordinate axis (5) in relation to a measuring device casing (3) and is guided on the casing (3) so as to be universally pivotable about a first pivot (19) on the main coordinate axis (5) by means of a first universal joint (13). A coupling arm (23) is connected on the same axis to the contact arm (7) and its end away from the first universal joint (13) is connected to a guide component (29) so as to pivot in all directions about a second pivot (27) by means of a second universal joint (25). The guide component (29) is in turn guided on the casing (3) so be pivotable in all directions about a third pivot movable on the main coordinate axis (5) by means of a third universal joint (31). The guide component (29) has an annular shoulder (51) surrounding the main coordinate axis (5) and pointing away from the first pivot which is supported on an opposite annular shoulder (45) also surrounding the main coordinate axis (5) of a coupling member (41) movable in the casing (3) parallel to the main coordinate axis (5). A dial gauge (11) measures the travel of the coupling member (41). With suitable distances between the pivots, radial deflection of the contact end (9) of the contact arm (7) and axial deflection of the contact end (9) through equal distances result in equal deflections of the coupling member (41).
摘要:
A measurement probe for use on machine tools or coordinate measuring machines has a stylus (12) mounted in a probe body (10), for displacement in each of the axes x, y, z. On each axis, the relative motion is supported by a pair of cylindrical linear bearings, which are parallel to each other and spaced apart. The bearings comprise a shaft (30) and concentric sleeve (26), between which is located a cage (28) of ball bearings. The arrangement achieves good performance in a relatively small housing.
摘要:
The disclosure pertains to a probe head (PH) for use in coordinate measuring machines and having a stylus (10) supported for axial displacement (D1) and angular displacements (D2, D3). A transducer (T1) senses axial forces (F1) on the sensing end (11) of the stylus due to engagement thereof with a workpiece (12). A strain gauge system (16) provided on the stylus senses transverse forces (F2) on the sensing end (11) of the stylus. The forces (F1, F2) are used to determine the orientation of the surface (12A) of the workpiece and a control system is described which responds to those forces to maintain the stylus normal to said surface (12A) during a scanning operation.
摘要:
An apparatus for checking linear dimensions and other features of workpiece (42) comprises a base (2), which carries rest devices (40) for supporting the workpiece to be checked with the geometrical axis horizontally arranged, and a support structure (88) to which gauging heads (170, 230) are coupled. The support structure (88) can rotate about a horizontal axis to carry the gauging heads (170, 230) from a rest position to a working one. The axis of rotation of the support structure (88) is obtained in correspondence to a vertical geometrical plane passing through the workpiece axis, when the latter is placed in the checking position, and is located below the workpiece axis, for getting easy loading and unloading operations of the workpiece (42).
摘要:
An improved measuring bar device includes first and second parallel bars retained in a center housing by an array of biased and canted rollers that engage cam surfaces defined by the bars to provide for equal and opposite movement of the bars while maintaining the bars in parallel array.
摘要:
Method and device for checking the dimensions of vehicles, preferably in connection with carrying out alignment work thereon. The method and the device use a reference frame (1) which is suspended from the chassis of the vehicle. Indicators (5, 12) are disposed at selected check points in the vehicle to indicate a possible deviation in position from a desired value at an individually selected check point on the vehicle, the nominal position of which is known and which is characteristic of the vehicle. The indicators comprise first indicator elements each in the form of a vertically adjustable lead rule (12) which is suspended in said check point or in points related thereto outside the vehicle, and second indicator elements in the form of horizontally adjustable reference pins (5). The distance between a selected reference point (12a) on the first indicator element and a selected reference point (5a) on the second indicator element constitutes a measure of the deviation sought.
摘要:
A sensing system which includes a surface sensing device (20) is provided for generating a representation of an object (22) using an array of sensing elements (23) that may have a sensing pin and a cylindrical housing. The sensing elements (23) generate a signal representing a height of various points on the surface of the object (22) relative to a reference plane. The sensing elements (23) may be resistive sensing elements or capacitive sensing elements.
摘要:
A mounting device for a telescopic ball-bar has a hexagonal shank (20) which is retained in the jaws (14) of a chuck (12) on the spindle (10) of a lathe. A supporting bracket (24) extending from the shank (20) carries a magnetic socket (22) in one of a plurality of locations (26), and receivably mounts one end of the ball-bar for universal pivotal motion. The configuration of the bracket (24), the spacing between the socket (22) and the shank (20), and the orientation of the socket (22), are such that the other end of the ball-bar, which is universally pivotally mounted to the tool post (16) of the lathe, may execute a circular trajectory of greater than 180 DEG , which trajectory intersects the axis of rotation (A) of the lathe.
摘要:
Disclosed is a method and an instrument for determining the paths of the edges of objects using coordinate-measurement techniques, the sensor element being semi-rigidly mounted in the direction of travel.