Collision-free automatic dimensional inspection using coordinate measuring machines

1989 ◽

Author(s):

F. Etesami

Keyword(s):

Lagrange Multipliers ◽

Optimization Problem ◽

Coordinate Measuring Machines ◽

Vision Systems ◽

Dimensional Inspection ◽

Perfect Form ◽

Nominal Feature ◽

Manual Tasks ◽

Tolerance Verification

Abstract One of the routine manual tasks in dimensional inspection is the assembly verification of circular features by mechanical gaging. With the aid of coordinate measuring machines or vision systems, this task can be performed more efficiently through simulation or soft-gaging. A formulation is presented for interpretation of 2D position tolerance specifications. Simulated gages are constructed from datum features as a set of constraint relationships. The measure of perfect-form position-imperfection is determined as the distance between the measured and the nominal feature positions subject to datum constraint requirements. The derived formulation is applied to an example part with a hole-slot datum-priority-frame. This formulation results in a three-variable optimization problem which is solved by an Augmented Lagrange Multipliers technique. The extension of the formulation to 3D is also discussed, but without reference to a specific representation.

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Comparison between a Laser Micrometer and a Touch Trigger Probe for Workpiece Measurement on a CNC Lathe

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.498.49 ◽

2012 ◽

Vol 498 ◽

pp. 49-54 ◽

Cited By ~ 6

Author(s):

G. Valiño ◽

C.M. Suárez ◽

J.C. Rico ◽

B.J. Álvarez ◽

D. Blanco

Keyword(s):

Coordinate Measuring Machines ◽

Machine Accuracy ◽

Dimensional Inspection ◽

Cnc Lathe ◽

Touch Trigger Probe ◽

Repeatability And Reproducibility ◽

Cylindrical Workpiece ◽

Machine Control

The current requirements for an efficient dimensional inspection of manufactured parts have lead to development of different in process and on-machine measurement (OMM) techniques. Touch trigger probes (TTP) are the most common technologies utilized, inspired on contact probes used on coordinate measuring machines (CMMs). The on-machine accuracy of TTPs depends upon precision of the tool-machine control as well as upon the procedure for TTP presetting. Taking this into account, a different OMM technique is considered in this work, which consists on a laser micrometer (LM) that is commonly used for in-process measurement of continuous products. The behaviour of TTP and LM is analysed and discussed in terms of repeatability and reproducibility. Results obtained by both techniques are compared each other by measuring a cylindrical workpiece and by checking the results with those obtained on a CMM.

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Accessibility analysis for planning of dimensional inspection with coordinate measuring machines

IEEE Transactions on Robotics and Automation ◽

10.1109/70.782025 ◽

1999 ◽

Vol 15 (4) ◽

pp. 714-727 ◽

Cited By ~ 58

Author(s):

S.N. Spitz ◽

A.J. Spyridi ◽

A.G. Requicha

Keyword(s):

Coordinate Measuring Machines ◽

Dimensional Inspection ◽

Accessibility Analysis

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An Intelligent Planning Environment for Automated Dimensional Inspection Using Coordinate Measuring Machines

Journal of Engineering for Industry ◽

10.1115/1.2899775 ◽

1992 ◽

Vol 114 (2) ◽

pp. 222-230 ◽

Cited By ~ 33

Author(s):

Chia-Hsiang Menq ◽

Hong-Tzong Yau ◽

Ching-Li Wong

Keyword(s):

Decision Making ◽

Basic Structure ◽

Inspection System ◽

Coordinate Measuring Machines ◽

Localization Algorithm ◽

Sculptured Surfaces ◽

Inspection Planning ◽

Dimensional Inspection ◽

Knowledge Based ◽

Intelligent Planning

This paper presents a basic structure of an intelligent planning environment for automated dimensional inspection using coordinate measuring machines (CMMs). Three levels of automation technology, ranging from the facility automation to information and decision automation, are discussed. At the facility level, the operations of the CMMs are examined for the dimensional inspection of various manufactured objects. In this research the dimensional inspection of objects having complex and sculptured surfaces is emphasized. At the information level, a CAD-directed inspection system is implemented. The system is composed of three key elements: CAD/CMM inspection planning module, CAD model based localization algorithm, and comparative analysis module. In addition, the concept of inspection attributes is introduced. Inspection attributes are some pieces of information that are stored in the CAD database along with the design model for inspection application. Typical inspection attributes include functional tolerances and manufacturing capability. At the decision making level, an inspection planner is proposed in conjunction with the CAD directed inspection to provide links between the CAD/CMM system and inspection goal. The planner is a knowledge based system which utilizes artificial intelligence technologies to automate the decision making in inspection planning.

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