GB1492401A - Surface measuring instruments - Google Patents
Surface measuring instrumentsInfo
- Publication number
- GB1492401A GB1492401A GB4516174A GB4516174A GB1492401A GB 1492401 A GB1492401 A GB 1492401A GB 4516174 A GB4516174 A GB 4516174A GB 4516174 A GB4516174 A GB 4516174A GB 1492401 A GB1492401 A GB 1492401A
- Authority
- GB
- United Kingdom
- Prior art keywords
- workpiece
- sensor
- centre
- centring
- curvature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
- G01B7/293—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures for measuring radius of curvature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
- G01B7/31—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B7/312—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
1492401 Determining the centre of curvature of a body RANK ORGANISATION Ltd 18 Sept 1975 [24 Sept 1974] 41561/74 Heading G1N The invention relates to a method of determining the co-ordinates of the centre of curvature of the curved surface of a workpiece with respect to a predetermined frame of reference, the origin of which coincides with the centre of relative rotation between the workpiece and a sensor of a surface measurement instrument of the type comprising a table on which the workpiece is mounted and the sensor, the table and sensor being relatively rotatable about a fixed axis. The method comprises the steps of traversing the sensor over the workpiece surface and deriving from the sensor output three signals representing the value of the radial distance of the workpiece from the fixed axis at three points along the traverse of the sensor the middle point lying at the intersection of one of the axes of the predetermined frame of reference and the workpiece surface, and the other two points extending an angle Ï with the middle point at the fixed axis, and deriving from these values two output signals representing the expressions, and where x and y respectively represent the coordinates of the centre of curvature of the workpiece parallel to and perpendicular to the said one axis and r 1 , r 2 , r 3 represent the radial distance at the three points in order along the traverse. For a workpiece with a rough surface the value of the radial distance of each point may be the average distance over a range about the point. These ranges should not overlap but are preferably contiguous. The method may be used for centring a workpiece on the table, the centring being effected automatically on the co-ordinates of the centre of curvature thereof being evaluated. For accuracy after the first "centring" the method may be again carried out, followed by a second "centring" the process being repeated as required. The apparatus for carrying out the method comprises a potentiometer 21 which monitors the rotation of the motor spindle and four connected potentiometers 22, 25, 33, 34, the first 22 setting the angle Ï and with the potentiometer 21 controls the motor, the second 25 providing the value of 0 to a computing portion of the apparatus and the third 33 and fourth 34 deriving the values sin Ï and 1 - cos Ï respectively. Integrators 30 and 31 under the control of integrator switching and scaling circuit 27 derive from the range of sweep of the sensor about each point the values of r 1 , r 2 and r 3 , the output of integrator 30 representing the expression 2r2 - (ri + r3) and the output of integrator 31 representing the expression r 3 -r 1 . These representations are scaled by the outputs of potentiometers 34 and 33 respectively and the values of y and x so produced are then displayed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4516174A GB1492401A (en) | 1975-09-18 | 1975-09-18 | Surface measuring instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4516174A GB1492401A (en) | 1975-09-18 | 1975-09-18 | Surface measuring instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1492401A true GB1492401A (en) | 1977-11-16 |
Family
ID=10436131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4516174A Expired GB1492401A (en) | 1975-09-18 | 1975-09-18 | Surface measuring instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1492401A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0015045A1 (en) * | 1979-01-04 | 1980-09-03 | The Rank Organisation Limited | A method of determining the coordinates of the centre of curvature of a workpiece surface which curves with a nominally constant radius of curvature |
FR2470951A1 (en) * | 1979-12-03 | 1981-06-12 | Finike Italiana Marposs | METHOD AND APPARATUS FOR CHECKING PARTS OF A HOMOCINETIC JOINT |
-
1975
- 1975-09-18 GB GB4516174A patent/GB1492401A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0015045A1 (en) * | 1979-01-04 | 1980-09-03 | The Rank Organisation Limited | A method of determining the coordinates of the centre of curvature of a workpiece surface which curves with a nominally constant radius of curvature |
FR2470951A1 (en) * | 1979-12-03 | 1981-06-12 | Finike Italiana Marposs | METHOD AND APPARATUS FOR CHECKING PARTS OF A HOMOCINETIC JOINT |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |