A New Compensation Method for Measurement of Thread Pitch Diameter by Profile Scanning

Abstract

For measurement of existing thread parameters using profile scanning, system error increases as pitch diameter, difference between the calibrating thread and measuring thread increases with the single gauge calibration method. There are several alignment deviations affecting the measurement of pitch diameter. To reduce the system error, a compensation method using two standard thread gauges to calculate the alignment deviations is proposed here. Finally, the theoretical and experimental comparisons between the single gauge calibration method and the proposed method are presented. The results demonstrate that the two gauges calibration method can effectively reduce the system error.

A novel measuring tip for thread functional diameter: error compensation of the effect of lead angle and curvature radius

“…The IAC measurement belongs to the stylus scanning method. It measures the tooth profile in a single axial section and estimates the functional diameter by adding the effects of simple pitch diameter, pitch, and flank angle, which does not include the shape errors and the reciprocal effect of each parameter [17,19]. Similarly, the machine vision [11] and laser scanning methods both take the approach of measuring the profile parameters to calculate the functional diameter [30].…”

“…In addition, some special measuring tools such as thread template [14] and thread micrometer [15,16] can measure a specific parameter. Screw thread comprehensive measuring machines that use a stylus [17][18][19] or lasers to scan the axial sectional profile represent the highest level of single-parameter detection [20][21][22], and can obtain information such as major diameter, minor diameter, pitch, thread angle, and simple pitch diameter with only one measurement [23,24]. Moreover, the Johnson Gage detecting instrument measures functional size by a multi-tooth probe and pitch diameter by cone and vee form segments [25], which can achieve both synthetic and single-parameter measurements.…”

Improving the Measurement of Thread Parameters by Use of Corundum Elements

“…ВВЕДЕНИЕ Резьбовые соединения широко используются в изделиях ракетно-космической техники, авиации, судостроения, нефте-и газодобывающих других отраслях. Измерение параметров резьбы является непростой задачей и ее решению посвящено большое число работ за рубежом [1][2][3][4][5] и в России [6][7][8][9][10][11][12][13][14]. Требуемая точность систем измерения резьбовых параметров (СИРП) может достигать единиц микрометров, обусловливая порой субмикронную точность используемых средств измерения.…”

Edge detection of screw thread based on machine vision

“…For example, Gadelmawla E.S. et al developed a dynamic measurement system for geometric parameters based on a new type of ball screw for advanced profile measurement [1]; Wang et al designed an on-machine measurement system for oil drill pipe thread profile parameters [2];Wang et al designed an on-machine measurement system for oil drill pipe thread profile parameters [3]; Liu Y et al designed a thread inclination correction algorithm for feature circle extraction based on Hough transform [4]; YI C.L et al developed a machine vision external thread online measurement system based on non-contact measurement [5]; Qing B.T et al developed a novel laser-based system for thread measurement, which overcomes the shortcomings of traditional methods for measuring large bevels and eliminate the effect of lead angle [6]; Hsueh-Liang Huang et al developed a new laser-based thread profile measurement system based on laser measurement theory for the thread profile of ball screws [7]; Chen S et al compensated for the systematic error and solved the deviation when measuring the pitch diameter of the thread scanner [8]; In order to further improve the contour extraction effect; Cai Y et al improved the Zernike moment subpixel edge extraction algorithm [9].…”