A Simplified Method for Examining Profile Deviations of Conjugate Disk Cams

2008 ◽  
Vol 130 (5) ◽  
Author(s):  
Wen-Tung Chang ◽  
Long-Iong Wu
Keyword(s):  
Analytical Approach ◽  
Coordinate Measuring Machine ◽  
Measuring Instrument ◽  
Angle Variation ◽  
Cam Mechanism ◽  
Simplified Method ◽  
Cam Profile ◽  
Measuring Machine ◽  
Profile Errors ◽  
Dial Indicator

The profile errors of conjugate disk cams can be indirectly examined by means of measuring the conjugate condition of the assembled conjugate cam mechanism. This paper demonstrates how to measure the conjugate condition of the assembled conjugate cam mechanism to reveal the cam profile errors and also develops an analytical approach for relating the variation of the conjugate condition with the cam profile errors. For the machined conjugate cams with profile errors, if the subtending angle of the oscillating follower arms is intentionally changed to be variable, the variation of the subtending angle of the follower arms may indicate the variation of profile errors when the cams rotate. According to the magnitude of the subtending angle variation, the profile deviations of conjugate disk cams can be analyzed analytically. The profile errors of a pair of conjugate cams can be evaluated by means of the corresponding motion variation of the indicator reading. For such an examining method, the only required measuring instrument is a dial indicator. A pair of conjugate cams were examined by the method and also measured using a coordinate measuring machine to test the accuracy and efficiency of the method.

Inspecting Profile Errors of Conjugate Disk Cams With Coordinate Measurement

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Wen-Tung Chang ◽  
Long-Iong Wu ◽  
Kuang-Hua Fuh ◽  
Chen-Chou Lin
Keyword(s):  
Interpolation Method ◽  
Measurement Data ◽  
Coordinate Measuring Machine ◽  
Coordinate Measurement ◽  
Numerical Interpolation ◽  
Radial Dimension ◽  
Cam Profile ◽  
Measuring Machine ◽  
Profile Errors ◽  
Coordinate Data

To inspect cam profile errors, a coordinate measuring machine (CMM) is frequently employed. The coordinate data of discrete points at the cam surface are measured by a CMM in order to further evaluate the actual cam profile with complicated interpolation algorithms, and then the cam contour approximated by these algorithms may be compared with the theoretical one. In this paper, a direct and simple analytical method, instead of a numerical interpolation algorithm, is proposed for inspecting the profile deviations of conjugate disk cams with coordinate measurement data. The method is based on the derived correlation between the radial-dimension errors and the normal-direction errors of conjugate cam profiles. To verify the proposed method, an experiment of inspecting a pair of conjugate disk cam profiles was conducted. The experimental results obtained from the proposed method were compared with those obtained by using the Hermite interpolation method. It shows that this method is accurate and more efficient for inspecting the profile errors of conjugate disk cams.

scholarly journals Research of three dimensional laser scanning coordinate measuring machine

2018 ◽  
Vol 232 ◽  
pp. 02015
Author(s):  
Zhihua Jiang ◽  
Wenjian Zhang ◽  
Lizhen Cui
Keyword(s):  
3D Printing ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Coordinate Measuring Machine ◽  
Coordinate Measuring Machines ◽  
Measuring Instrument ◽  
Calibration System ◽  
Measuring Range ◽  
Measuring Machine

Three dimensional laser scanning coordinate measuring machine is suitable for the measurement of 3D printing products, and its measuring range depends on the three coordinate measuring machine. It is the main 3D printing product measuring instrument [1]. In this paper, the principle of laser scanning three coordinate measuring machine is analyzed. The accuracy and reliability of the calibration system for 3D printing products are verified. According to the newly revised JJF 1064 Calibration specification for coordinate measuring machines [3], it is calibrated.

Measurement System for Non-Cylinder Pin Hole of Piston

2011 ◽  
Vol 301-303 ◽  
pp. 617-622
Author(s):  
Z. Y. Yang ◽  
D. H. Liu ◽  
F. Yang ◽  
Z. G. Xie ◽  
Y. Huang
Keyword(s):  
High Precision ◽  
Measurement System ◽  
Coordinate Measuring Machine ◽  
Measuring Instrument ◽  
Movement Error ◽  
Pneumatic Measuring ◽  
Software Modules ◽  
Measuring Machine

Aim to the low measuring precision of non-cylinder pin hole using the coordinate measuring machine(CMM)and pneumatic measuring instrument, a new solution is proposed which use the high-precision digital lever probe to detect the contours of pin hole with a single clamping situation. The measuring principal of non-cylinder pin hole of piston is introduced and the functions and measuring processes of the measurement system are also presented. The software modules are given and the probe centering error and the parallelism movement error are discussed detailedly. A measuring example is given in the end. The measuring results show that the measurement system has the ability to detect the contours of pin hole with high-precision and efficiently.

Development of a Measuring System for Planar Cam Profiles and Their Follower Motions

2004 ◽  
Author(s):  
Der-Min Tsay ◽  
Kuo-Shu Tseng ◽  
Hsin-Pao Chen
Keyword(s):  
Contact Point ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Displacement Curve ◽  
Practical Application ◽  
Test Bed ◽  
Theoretical Design ◽  
Cam Profile ◽  
Computing Procedure ◽  
Measuring Machine

A measuring system that can be used to inspect planar cam contours and to evaluate their follower displacement, velocity, and acceleration curves with a higher degree of accuracy without the aid of approximating follower displacements in traditional methods is constructed. Based on the geometric relationships at the contact point between a planar cam profile and its follower, analytical descriptions that can be utilized to determine the follower displacement curve and its derivatives are first identified. To verify the feasibility and accuracy of the algorithms proposed for the measuring system, analytical results generated from a theoretical design are compared to those obtained by the application of the computing procedure. To demonstrate the effectiveness and usefulness of the developed procedure, a measuring test bed has been constructed for a practical application example. Furthermore, the results obtained by using the built measuring system are also compared to those obtained by using a coordinate measuring machine (CMM) with the proposed algorithms.

DIMENSIONAL INSPECTION OF TRANSLATING CAMS BY CNC COORDINATE MEASURING MACHINE

2012 ◽  
Vol 36 (3) ◽  
pp. 259-270
Author(s):  
Jung-Fa Hsieh
Keyword(s):  
Kinematic Model ◽  
Coordinate Measuring Machine ◽  
Least Square ◽  
Normal Vector ◽  
Transformation Theory ◽  
Fitting Method ◽  
Cam Profile ◽  
Measuring Machine ◽  
Normal Vectors ◽  
Nc Data

In this paper, a simple and analytical method is proposed for accomplishing the inspection procedure. In the proposed approach, a kinematic model of the cam profile is derived using homogenous coordinate transformation theory. The normal vectors and principal curvature of the designed translating cam are then derived from the analytical expression for the cam profile. Based on the coordinates and normal vector of each specified point on the cam profile, the NC data required to move the CMM inspection probe to the surface of the cam are then obtained. A least-square fitting method is proposed to minimize the inspection error caused by a misalignment of the actual evaluation frame relative to the ideal frame.

A Procedure for Measuring Planar Cam Profiles and Their Follower Motions

2005 ◽  
Vol 128 (3) ◽  
pp. 697-704 ◽  
Author(s):  
Der-Min Tsay ◽  
Kuo-Shu Tseng ◽  
Hsin-Pao Chen
Keyword(s):  
Contact Point ◽  
Coordinate Measuring Machine ◽  
Displacement Velocity ◽  
Displacement Curve ◽  
Practical Application ◽  
Test Bed ◽  
Traditional Methods ◽  
Theoretical Design ◽  
Cam Profile ◽  
Measuring Machine

A procedure that can be used to inspect planar cam contours and to evaluate their follower displacement, velocity, and acceleration curves with a higher degree of accuracy, without the aid of approximating follower displacements in traditional methods, is constructed. Based on the geometric relationships at the contact point between a planar cam profile and its follower, analytical descriptions that can be utilized to determine the follower displacement curve and its derivatives are first identified. To verify the feasibility and accuracy of the proposed procedure, analytical results generated from a theoretical design are compared to those obtained by the application of the procedure. To demonstrate the effectiveness and usefulness of the developed procedure, a measuring test bed has been constructed for a practical application example. Furthermore, the results obtained by using the developed procedure with the built measuring test bed are also compared to those obtained by using a coordinate measuring machine with the proposed algorithms.

Disc cam mechanisms with concave-faced followers

2009 ◽  
Vol 223 (6) ◽  
pp. 1443-1448 ◽  
Author(s):  
L-I Wu ◽  
C-H Liu ◽  
T-W Chen
Keyword(s):  
Contact Stress ◽  
Analytical Approach ◽  
Cam Mechanism ◽  
Cam Profile ◽  
Lower Contact

This article proposes an uncommon follower, a concave-faced follower, for a disc cam mechanism and also presents an analytical approach for determining the cam profile. A disc cam mechanism with a concave-faced follower can have the advantage of lower contact stress over that with a flat-faced follower. Two examples are provided to illustrate the nature and capability of reducing contact stress of this uncommon follower.

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