Design of a Universal Software System for Controlling Geometric Measuring Devices

2006 ◽  
Vol 7 (1) ◽  
pp. 108-111 ◽  
Author(s):  
K. Lübke ◽  
C. Pieper ◽  
G. Goch ◽  
K. Kammers
Keyword(s):  
User Interface ◽  
Coordinate Measuring Machine ◽  
Specific Form ◽  
Measuring Device ◽  
New Developments ◽  
Measuring Devices ◽  
Different Types ◽  
Broad Variety ◽  
Measuring Machine ◽  
And Control

The research project UP-Prosa, a German acronym for universal and unified platform for planning, programming, controlling and evaluating processes, of measuring, aims at realizing a platform to design and control processes of geometry measurements, which supports a broad variety of measuring devices via one user interface. Based on Windows Operating System (OS) a software was developed able to control inspection devices for different types of geometry measurements (coordinate measuring machine, form, roughness, gear) and manufacturers by one defined communication protocol. This uniform user interface contains the programming of measurement processes, evaluation algorithms with standardized methods, as well as abilities to generate record pages at the users expectations. At the level of geometric measuring devices a universal controlling software called Prosa InterCommunicator (Prosa-ICom) was designed. Prosa-ICom communicates via network with the user interface and translates the defined protocol into a measuring device specific form. The internal structure is extendable and so it seems to be appropriate for both new developments and upgrades (retrofit) for all kinds of geometric measuring devices.

Development of a Novel Gear Measuring Device of High Accuracy

2003 ◽  
Author(s):  
Frank Ha¨rtig ◽  
Christian Keck ◽  
Karin Kniel ◽  
Heinrich Schwenke ◽  
Klaus Wendt ◽  
...  
Keyword(s):  
Manufacturing Industry ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
National Metrology Institute ◽  
Distance Information ◽  
Measuring Device ◽  
Measurement Results ◽  
Gear Manufacturing ◽  
Measuring Machine ◽  
Tracking Interferometer

The German national metrology institute, the Physikalisch-Technische Bundesanstalt (PTB), has developed a novel calibration method for gear artefacts. This reduces the current calibration uncertainty of gear standards, which is an essential step towards meeting the rising quality demands of the gear manufacturing industry. The measurement setup is based on a coordinate measuring machine (CMM) equipped with a high-precision rotary table. The key element of the novel gear measuring device is a tracking interferometer (TI) for reading the distance information. This information is combined with the reading of the coordinate measuring machine line scales in order to reduce the overall measurement uncertainty. If an optimized measurement strategy is applied, the measurement results are almost achieved with laser interferometer accuracy. First simulations and measurement results for an involute profile artefact are presented and discussed.

scholarly journals Analysis and Compensation of Equivalent Diameter Error of Articulated Arm Coordinate Measuring Machine

2018 ◽  
Vol 51 (1-2) ◽  
pp. 16-26 ◽  
Author(s):  
Zai Luo ◽  
Hui Liu ◽  
Dong Li ◽  
Kun Tian
Keyword(s):  
Coordinate Measuring Machine ◽  
Maximum Error ◽  
Error Reduction ◽  
Experimental Result ◽  
Average Error ◽  
Equivalent Diameter ◽  
Error Source ◽  
Measuring Device ◽  
Measuring Machine ◽  
Measuring Force

As a key part of the articulated arm coordinate measuring machine, the probe can determine the measurement accuracy. Therefore, the error source and influencing factors of the equivalent diameter of the probe are studied. First, the influence of the primary factor of the measuring force on the equivalent diameter of the probe is studied by analyzing the influence degree of its error source. Second, a mathematical model of the relationship between the equivalent diameter and the measuring force of the articulated arm coordinate measuring machine is built to compensate for the equivalent diameter error caused by the measuring force by the simulated annealing method. To illustrate the application advantage of our proposed study, a simple force-measuring device is designed based on this model. The experimental result shows that the maximum error reduction is approximately 43 µm, while the average error reduction ranges from 33 to 4.0 µm, which represents an 87.7% improvement. Overall, our proposed method can effectively compensate for the equivalent diameter error caused by the measuring force. This method can improve the accuracy of the articulated arm coordinate measuring machines on both calibration and measurement.

scholarly journals In Vitro Comparative Evaluation of Different Types of Impression Trays and Impression Materials on the Accuracy of Open Tray Implant Impressions: A Pilot Study

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Sonam Gupta ◽  
Aparna Ichalangod Narayan ◽  
Dhanasekar Balakrishnan
Keyword(s):  
Reference Model ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Impression Material ◽  
Impression Materials ◽  
Significant Difference ◽  
Different Types ◽  
Measuring Machine ◽  
The Difference

Purpose. For a precise fit of multiple implant framework, having an accurate definitive cast is imperative. The present study evaluated dimensional accuracy of master casts obtained using different impression trays and materials with open tray impression technique.Materials and Methods. A machined aluminum reference model with four parallel implant analogues was fabricated. Forty implant level impressions were made. Eight groups (n=5) were tested using impression materials (polyether and vinylsiloxanether) and four types of impression trays, two being custom (self-cure acrylic and light cure acrylic) and two being stock (plastic and metal). The interimplant distances were measured on master casts using a coordinate measuring machine. The collected data was compared with a standard reference model and was statistically analyzed using two-way ANOVA.Results. Statistically significant difference (p<0.05) was found between the two impression materials. However, the difference seen was small (36 μm) irrespective of the tray type used. No significant difference (p>0.05) was observed between varied stock and custom trays.Conclusions. The polyether impression material proved to be more accurate than vinylsiloxanether impression material. The rigid nonperforated stock trays, both plastic and metal, could be an alternative for custom trays for multi-implant impressions when used with medium viscosity impression materials.

Integration of Multi-View Data Based on Auxiliary Reference Plane

2010 ◽  
Vol 139-141 ◽  
pp. 1361-1364
Author(s):  
Ke Wei Lin ◽  
Xin Liu ◽  
Ming De Duan
Keyword(s):  
Reverse Engineering ◽  
Coordinate Measuring Machine ◽  
Complex Surface ◽  
Reference Plane ◽  
Scanning System ◽  
Practical Result ◽  
Laser Tracking ◽  
System A ◽  
Measuring Devices ◽  
Measuring Machine

The integration of multi-view data in the acquisition of complex surface is researched by using the CMM (coordinate measuring machine) and the laser tracking scanning system. A multi-view data integration method based on the auxiliary reference plane is presented. With the precise auxiliary reference plane, the data measured by the different measuring devices and measuring views are aligned and the accuracy is analyzed. If the error is controlled in a certain range, this method can satisfy the demands of the model and assembly. The problems of low-efficient and low-accuracy in the data fusion of complex surface during the reverse engineering are solved. Meanwhile, the advantages of the different measuring devices and measuring methods are developed. This method has been applied to the reverse engineering development for a motorcycle cover model. The practical result shows that this new method is feasible and efficient.

Computer-aided monitoring and operation of continuous measuring devices

2004 ◽  
Vol 50 (11) ◽  
pp. 31-39 ◽  
Author(s):  
L. Rieger ◽  
M. Thomann ◽  
A. Joss ◽  
W. Gujer ◽  
H. Siegrist
Keyword(s):  
Control Charts ◽  
Measuring System ◽  
Measuring Device ◽  
Supervisory System ◽  
Monitoring Frequency ◽  
Measuring Devices ◽  
Monitoring Effort ◽  
Continuous Measuring ◽  
And Control

Extended studies of measuring and control systems in activated sludge plants at EAWAG revealed that the measuring devices remain the weakest point in control applications. To overcome this problem, a software package was developed which analyses and evaluates the residuals between a reference measurement and the sensor and collects the information in a database. The underlying monitoring concept is based on a two-step evaluation of the residuals by means of statistical evaluations using control charts with two different sets of criteria. The first step is a warning phase in which hints on probable errors trigger an increase in the monitoring frequency. In the second step, the alarm phase, the error hypothesis has to be validated and should allow immediate and targeted reactions from the operator. This procedure enables an optimized and flexible monitoring effort combined with an increased probability of early detection of systematic measuring errors. Beside the monitoring concept, information about the measuring device, the performed servicing actions and the responsibilities is stored. Statistical values for the quantitative characterization of the measuring system during operation will be given. They are needed to parameterise controllers or to guarantee the accuracy of the instrument in order to allow reliable calculations of effluent tax. In contrast to other concepts, not only is the measuring device examined under standard conditions, but so is the entire measuring chain from the liquid to be analysed to the value stored in the database of the supervisory system. The knowledge of the response time of the measuring system is then required in order to allow a comparison of the corresponding values.

Integrated process and control design for fast coordinate measuring machine

Mechatronics ◽  
1993 ◽  
Vol 3 (3) ◽  
pp. 343-368 ◽  
Author(s):  
M.R. Katebi ◽  
J. McIntyre ◽  
T. Lee ◽  
M.J. Grimble
Keyword(s):  
Control Design ◽  
Coordinate Measuring Machine ◽  
Integrated Process ◽  
Measuring Machine ◽  
And Control

An Integrated Lattice Filter Adaptive Control System for Time-Varying CMM Structural Vibration Control, Part 2: Experimental Implementation

1996 ◽  
Vol 118 (1) ◽  
pp. 77-87
Author(s):  
E. Lu ◽  
J. Ni ◽  
Z. G. Huang ◽  
S. M. Wu
Keyword(s):  
Adaptive Control ◽  
Digital Signal Processor ◽  
Coordinate Measuring Machine ◽  
Digital Signal ◽  
Structural Vibration ◽  
Time Varying ◽  
Lattice Filter ◽  
Experimental Implementation ◽  
Measuring Machine ◽  
And Control

The integrated fast lattice filter adaptive control algorithm developed in Part 1 of this paper will be implemented for the control of the structural vibration of a coordinate measuring machine (CMM). The structural vibration of a CMM exhibits time-varying dynamic characteristics. For auxiliary control, the probe head acceleration was measured to compute the voltage input to the servo motor of the CMM. The developed algorithm uses directly the lattice filter parameters to track and control the CMM structural dynamics and is implemented on a Sheffield horizontal arm Coordinate Measuring Machine using a floating point Digital Signal Processor TMS320C30. Through experiments, significant reduction of the CMM settling time has been achieved by suppressing the structural vibration. In certain configurations, the reduction was 95 percent.

Precision Evaluation for Cycloidal Gears

2019 ◽  
Author(s):  
Yi-Pei Shih ◽  
Shih-Hung Lo ◽  
Bor-Tyng Sheen ◽  
Yi-Hung Tsai
Keyword(s):  
Machine Tools ◽  
Coordinate Measuring Machine ◽  
Industrial Robots ◽  
Measuring Devices ◽  
Output Torque ◽  
Precision Evaluation ◽  
Measuring Machine ◽  
Gear Drives ◽  
Large Output

Abstract Cycloidal gear drives have advantages of compact sizes, large reduction ratios, and low backlash. They are particularly suitable for applications in precise positioning and large output torque, such as industrial robots and machine tools. Up to now, the effective precision evaluation of cycloidal gears is lacked in commercial measuring devices. The main goal of this paper is to propose precision evaluation for cycloidal gears. The research focuses on (1) establishing a mathematical model of cycloidal gear and (2) developing a method for precision evaluation of cycloidal gear. The evaluation items cover the following areas of tooth profile and thickness errors, pitch errors, accumulation pitch errors and runout. The profile points measured by a coordinate measuring machine are divided into tooth groups and then formulated as curves using a B-spline curve fitting technique. The precision of cycloidal gear can be further evaluated. A case study on Nabtesco RV-25N is displayed to verified the correctness of the proposed method.

Integration of Multi-View Data Based on Auxiliary Reference Plane

2009 ◽  
Author(s):  
Mingde Duan ◽  
Xin Liu ◽  
Wei Ma ◽  
Jishun Li
Keyword(s):  
Reverse Engineering ◽  
Coordinate Measuring Machine ◽  
Complex Surface ◽  
Reference Plane ◽  
Scanning System ◽  
Practical Result ◽  
Laser Tracking ◽  
System A ◽  
Measuring Devices ◽  
Measuring Machine

The integration of multi-view data in the acquisition of complex surface is researched by using the CMM (coordinate measuring machine) and the laser tracking scanning system. A multi-view data integration method based on the auxiliary reference plane is presented. With the precise auxiliary reference plane, the data measured by the different measuring devices and measuring views are aligned. The problems of low-efficient and low-accuracy in the data fusion of complex surface during the reverse engineering are solved. Meanwhile, the advantages of the different measuring devices and measuring methods are developed. This method has been applied to the reverse engineering development for a motorcycle cover model. The practical result shows that this new method is feasible and efficient.

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