JPH03239909A - Method and instrument for measuring external diameter of round tube, round rod and the like - Google Patents

Method and instrument for measuring external diameter of round tube, round rod and the like

Info

Publication number
JPH03239909A
JPH03239909A JP3570790A JP3570790A JPH03239909A JP H03239909 A JPH03239909 A JP H03239909A JP 3570790 A JP3570790 A JP 3570790A JP 3570790 A JP3570790 A JP 3570790A JP H03239909 A JPH03239909 A JP H03239909A
Authority
JP
Japan
Prior art keywords
computing
round
external diameter
coordinates
tube
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.)
Pending
Application number
JP3570790A
Other languages
Japanese (ja)
Inventor
Takahito Furukawa
Atsuhisa Takekoshi
Original Assignee
Nkk Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nkk Corp filed Critical Nkk Corp
Priority to JP3570790A priority Critical patent/JPH03239909A/en
Publication of JPH03239909A publication Critical patent/JPH03239909A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To measure the external diameter of the round tube, round rod, etc., irrelevantly to the center position of its section by assuming the outer periphery of the round tube, round rod, etc., is circular or elliptic, and finding the coordinates of points on the outer periphery by a range finder.
CONSTITUTION: The range finder 8 measures distances to respective measurement points a - l and sends them to a measured value coordinate computing element 11. A steel tube 1 is measured while sent by the rotation of a feed roller 10, so five computing elements 11 are provided so as to facilitate arithmetic based upon the measurement point coordinates at the same time, but the steel tube 2 can be measured in a stationary state and the coordinates of the measurement points can be calculated by one element in order in this case. Then the computing element 11 performs arithmetic to find those measurement points, which are sent to an external diameter computing element 12. The computing element 12 substitutes those coordinates in a general expression showing an ellipse, and a simultaneous equation consists of 5 equations being obtained is solved to determine the target ellipse.
COPYRIGHT: (C)1991,JPO&Japio
JP3570790A 1990-02-16 1990-02-16 Method and instrument for measuring external diameter of round tube, round rod and the like Pending JPH03239909A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3570790A JPH03239909A (en) 1990-02-16 1990-02-16 Method and instrument for measuring external diameter of round tube, round rod and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3570790A JPH03239909A (en) 1990-02-16 1990-02-16 Method and instrument for measuring external diameter of round tube, round rod and the like

Publications (1)

Publication Number Publication Date
JPH03239909A true JPH03239909A (en) 1991-10-25

Family

ID=12449338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3570790A Pending JPH03239909A (en) 1990-02-16 1990-02-16 Method and instrument for measuring external diameter of round tube, round rod and the like

Country Status (1)

Country Link
JP (1) JPH03239909A (en)

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