Apparatus for measuring the transverse profile of a drill...

Details Apparatus for measuring the transverse profile of a drill... Apparatus for measuring the transverse profile of a drill...

G - Physics

01

B

33/181

G01B 3/22 (2006.01) E21B 47/08 (2006.01) G01B 7/13 (2006.01)

Patent

CA 1242878

ABSTRACT OF THE DISCLOSURE The telescoping parts of a rotary measuring arm mounted on an axis between two centering devices enable the outer part of the measuring arm, which is equipped with a scanning roller, to be let out or pushed in by the contour of the bore as the arm is swung around by a remote control drive. During such a scan of the bore wall, an inductive or capacitive transducer provides signals representative of the radius measured to a remote location. The three legs of each centering device can be retracted or extended togeth- er by the same amount when the measuring device is removed from or set into place in the bore. A drive is also provided for retracting the measuring arm when the apparatus is being moved in the bore.

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