The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner... more The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner. Special attention is paid to the comparison of the CMM measurement and scanner with the aim of optimal selection of measurement method depending on the measuring object characteristics which need to be obtained. For the purpose of comparing measurement methods, the product was made using 3D printing technology (FDM) based on 3D CAD model which will serve as a reference basis for measuring deviations on actual model. CMM on which the measurement was performed is a five-axis CMM (three translational and two rotational degrees of freedom) manufactured by Hexagon. The software used on the CMM is PC-DMIS 2018. Scanning was performed with a structured light scanner from Steinbicher using the required softwares (Colin3D, InspectPlus and GOM Inspect). A direct comparison of the measurement procedures on the CMM and the scanner of one product obtained on a 3D printer is given below.
The aim of this paper is to test Six Sigma concept developed to optimize the manufacturing proces... more The aim of this paper is to test Six Sigma concept developed to optimize the manufacturing process for a company with about 200 employees. This test includes process monitoring, using statistical process control charts, and analyzing collected data for two different periods, before and after DMAIC methodology application. Dominant defect and its causes had been identified and it was found out that the process was not under control. Implementing improvement measures, dominant defect was eliminated but this didn’t enable to put the process under control. As a conclusion, the test indicated that the model is effective but it takes more iterations to achieve the desired state.
The international standard ISO/IEC 17020 contains the requirements for work of various inspection... more The international standard ISO/IEC 17020 contains the requirements for work of various inspection bodies which aim to raise the level of their activities, as well as the confidence level of clients in performing inspection activities. Furthermore, the standard is aligned with other standards of series standards ISO/IEC 17000 and contains certain parts of guideline IAF/ILAC A4 as well as the mandatory parts of ISO/PAS documents. The standard is used as the reference document during an assessment process of inspection bodies by accreditation bodies. Based on the assessment, inspection bodies prove the fulfillment of the standard requirements, respectively their competencies for performing inspection activities and gain market confidence. The paper describes all necessary steps which should be taken into account by an inspection body so that it can fulfill general and technical requirements of the standard and demonstrate the necessary competencies for performing inspection activities....
The actual status of metrology infrastructure of B&H on the state level and possibilities for imp... more The actual status of metrology infrastructure of B&H on the state level and possibilities for improvement in future was discussed in this paper. The Institute of Metrology of Bosnia and Herzegovina (IMBiH) is a Government authority on the state level performing the functions of conformity assessment. Institute also has a role in harmonization of B&H legislation with the EC Directives. Since 2009. IMBiH has been full member of the European Association of National Metrology Institutes (EURAMET). Basic adopted laws in force on metrology in B&H are Law of metrology as well as Law on Measurement Units. The metrology system in B&H is highly decentralized, with a lack of correspondence between different levels of authorities. Accredited laboratories and other laboratories occupied with length measurement make their own traceability chain using laboratories in region and without inclusion of IMBiH. Laboratory for length in IMBiH is responsible for the realization and maintenance of the Nati...
Gauge block calibration is one of the oldest high precision calibrations made in dimensional metr... more Gauge block calibration is one of the oldest high precision calibrations made in dimensional metrology. Measurement Assurance Method determine calibration or measurement uncertainty based on systematic observations of achieved results. All length measurement processes are comparative operation, directly or indirectly. A comparator is device for measuring difference. The unknown length of a block is determined by measuring the difference between it and a reference block of the same nominal size and then calculating the unknown length. Measurement process is continually affected by perturbations from variety of sources. The uncertainty in the result of measurement generally consists of several components which may be grouped in two categories according to the way in which their numerical values are estimated: A-those which are evaluated by statistical methods and B-those which are evaluated by other means.
This research implements the Finite Element Analysis of the contact between the flexible part and... more This research implements the Finite Element Analysis of the contact between the flexible part and the CMM touch-probe in order to support the Cyber-Physical Manufacturing Metrology Model and its metrology integration into coordinate measuring machine (CMM) inspection of flexible parts. Although optical metrology offers a solution for flexible part measurements, because there is no contact between the measurand and the probing system, not all geometrical features are accessible by the optical CMM probe. Therefore, it is important to quantify and to validate the deformation introduced by the contact measuring process. The Cyber-Physical Systems connect the virtual and physical worlds in a way that intelligent objects communicate and interact with each other. This research will connect the physical measurement system consisting of CMM and flexible plastic part with their digital representation, where contact is simulated by means of Finite Element Method.
New Technologies, Development and Application IV, 2021
The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner... more The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner. Special attention is paid to the comparison of the CMM measurement and scanner with the aim of optimal selection of measurement method depending on the measuring object characteristics which need to be obtained. For the purpose of comparing measurement methods, the product was made using 3D printing technology (FDM) based on 3D CAD model which will serve as a reference basis for measuring deviations on actual model. CMM on which the measurement was performed is a five-axis CMM (three translational and two rotational degrees of freedom) manufactured by Hexagon. The software used on the CMM is PC-DMIS 2018. Scanning was performed with a structured light scanner from Steinbicher using the required softwares (Colin3D, InspectPlus and GOM Inspect). A direct comparison of the measurement procedures on the CMM and the scanner of one product obtained on a 3D printer is given below.
In view of the ever-increasing globalisation of economy, the removal of technical barriers to tra... more In view of the ever-increasing globalisation of economy, the removal of technical barriers to trade has become a central political task. To establish the preconditions for free trade throughout world, the World Trade Organization adopted agreement encouraging the development of mutual recognition agreements and of international conformity assessment systems. Such agreements are based on mutual confidence and manifest the final result of a continuous and close cooperation programme essentially consisting of three major elements: the harmonization of accreditation criteria and operation procedures, a comprehensive programme of interlaboratory comparisons and peer assessments by an international team of experienced accreditation experts. Gauge block calibration is one of the oldest high precision calibrations made in dimensional metrology. The most accurate measurements of gauge blocks have not changed appreciably in accuracy in the last 70 years. What was changed is the much more wide...
Surface geometry of technical parts can be divided on roughness, waviness and deviation of form. ... more Surface geometry of technical parts can be divided on roughness, waviness and deviation of form. Surface roughness is micro-irregularities developed in the process of metal cutting. Cutting-tool edge and condition of the same, and other various factors such as vibrations, rigidity of tool-workpeace system and etc cause those irregularities. All methods for surface metrology can be divided on contact and non-contact methods. In this article we discussed main parameters of roughness such as Ra, Rmax, R z , Rq, Rp, Rt. For testing is used Perthometer Concept device. Preparation and procedure for measurement is according to procedure given in working instructions of the same device.
This paper describes a new mathematical model for stress concentration factor of rectangular bar ... more This paper describes a new mathematical model for stress concentration factor of rectangular bar with opposite edge U-notches subjected to tension. Determination of model parameters is achieved by combining the design-of-experiment technique implemented in MATLAB software and the numerical simulation using FEMAP software. The design-of-experiment technique is used to obtain a variety of combinations of geometrical parameters, ie. experimental points, whereas the numerical simulation is applied to thus obtained experimental points. Results agree well with the data given in literature. This procedure for determination of stress concentration factors could be applicable for other stress concentration cases.
Gauge block calibration is one of the oldest high precision calibrations made in dimensional metr... more Gauge block calibration is one of the oldest high precision calibrations made in dimensional metrology. Gauge block comparison schemes are designed with a number of characteristics. The unknown length of a block is determined by measuring the difference between it and a reference block of the same nominal size and then calculating the unknown length. The sources of variation in measurements are numerous. Source of serious problems, which is not random, is the drift in the instrument readings. The instrumental drift can be obtained from any comparison scheme with more measurements than the number of unknown lengths plus one for the drift, since the drift rate can be includes a parameter in the model fit. This effect cannot be minimized by additional measurement because it is not generally pseudo-random, but a nearly monotonic shift in the readings. In this paper some techniques for drift eliminating of instrument are discussed.
The testing/calibration laboratories shall demonstrate their performance through their participat... more The testing/calibration laboratories shall demonstrate their performance through their participation in appropriate proficiency testing (PT) schemes by means of interlaboratory comparisons. Proficiency testing is the determination of laboratory testing performance by means of interlaboratory test comparisons. Interlaboratory comparison is the organization, performance and evaluation of tests on the same or similar test items by two or more laboratories in accordance with predetermined conditions. Participation in proficiency testing scheme provides independent verification of laboratory competence. It demonstrate to the publics, customers, accreditation bodies, regulators and management that procedures are under control and gives technical confidence in the service which laboratory provide.
The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner... more The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner. Special attention is paid to the comparison of the CMM measurement and scanner with the aim of optimal selection of measurement method depending on the measuring object characteristics which need to be obtained. For the purpose of comparing measurement methods, the product was made using 3D printing technology (FDM) based on 3D CAD model which will serve as a reference basis for measuring deviations on actual model. CMM on which the measurement was performed is a five-axis CMM (three translational and two rotational degrees of freedom) manufactured by Hexagon. The software used on the CMM is PC-DMIS 2018. Scanning was performed with a structured light scanner from Steinbicher using the required softwares (Colin3D, InspectPlus and GOM Inspect). A direct comparison of the measurement procedures on the CMM and the scanner of one product obtained on a 3D printer is given below.
The aim of this paper is to test Six Sigma concept developed to optimize the manufacturing proces... more The aim of this paper is to test Six Sigma concept developed to optimize the manufacturing process for a company with about 200 employees. This test includes process monitoring, using statistical process control charts, and analyzing collected data for two different periods, before and after DMAIC methodology application. Dominant defect and its causes had been identified and it was found out that the process was not under control. Implementing improvement measures, dominant defect was eliminated but this didn’t enable to put the process under control. As a conclusion, the test indicated that the model is effective but it takes more iterations to achieve the desired state.
The international standard ISO/IEC 17020 contains the requirements for work of various inspection... more The international standard ISO/IEC 17020 contains the requirements for work of various inspection bodies which aim to raise the level of their activities, as well as the confidence level of clients in performing inspection activities. Furthermore, the standard is aligned with other standards of series standards ISO/IEC 17000 and contains certain parts of guideline IAF/ILAC A4 as well as the mandatory parts of ISO/PAS documents. The standard is used as the reference document during an assessment process of inspection bodies by accreditation bodies. Based on the assessment, inspection bodies prove the fulfillment of the standard requirements, respectively their competencies for performing inspection activities and gain market confidence. The paper describes all necessary steps which should be taken into account by an inspection body so that it can fulfill general and technical requirements of the standard and demonstrate the necessary competencies for performing inspection activities....
The actual status of metrology infrastructure of B&H on the state level and possibilities for imp... more The actual status of metrology infrastructure of B&H on the state level and possibilities for improvement in future was discussed in this paper. The Institute of Metrology of Bosnia and Herzegovina (IMBiH) is a Government authority on the state level performing the functions of conformity assessment. Institute also has a role in harmonization of B&H legislation with the EC Directives. Since 2009. IMBiH has been full member of the European Association of National Metrology Institutes (EURAMET). Basic adopted laws in force on metrology in B&H are Law of metrology as well as Law on Measurement Units. The metrology system in B&H is highly decentralized, with a lack of correspondence between different levels of authorities. Accredited laboratories and other laboratories occupied with length measurement make their own traceability chain using laboratories in region and without inclusion of IMBiH. Laboratory for length in IMBiH is responsible for the realization and maintenance of the Nati...
Gauge block calibration is one of the oldest high precision calibrations made in dimensional metr... more Gauge block calibration is one of the oldest high precision calibrations made in dimensional metrology. Measurement Assurance Method determine calibration or measurement uncertainty based on systematic observations of achieved results. All length measurement processes are comparative operation, directly or indirectly. A comparator is device for measuring difference. The unknown length of a block is determined by measuring the difference between it and a reference block of the same nominal size and then calculating the unknown length. Measurement process is continually affected by perturbations from variety of sources. The uncertainty in the result of measurement generally consists of several components which may be grouped in two categories according to the way in which their numerical values are estimated: A-those which are evaluated by statistical methods and B-those which are evaluated by other means.
This research implements the Finite Element Analysis of the contact between the flexible part and... more This research implements the Finite Element Analysis of the contact between the flexible part and the CMM touch-probe in order to support the Cyber-Physical Manufacturing Metrology Model and its metrology integration into coordinate measuring machine (CMM) inspection of flexible parts. Although optical metrology offers a solution for flexible part measurements, because there is no contact between the measurand and the probing system, not all geometrical features are accessible by the optical CMM probe. Therefore, it is important to quantify and to validate the deformation introduced by the contact measuring process. The Cyber-Physical Systems connect the virtual and physical worlds in a way that intelligent objects communicate and interact with each other. This research will connect the physical measurement system consisting of CMM and flexible plastic part with their digital representation, where contact is simulated by means of Finite Element Method.
New Technologies, Development and Application IV, 2021
The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner... more The paper presents an analysis of a product made by 3D printing using CMM and a measuring scanner. Special attention is paid to the comparison of the CMM measurement and scanner with the aim of optimal selection of measurement method depending on the measuring object characteristics which need to be obtained. For the purpose of comparing measurement methods, the product was made using 3D printing technology (FDM) based on 3D CAD model which will serve as a reference basis for measuring deviations on actual model. CMM on which the measurement was performed is a five-axis CMM (three translational and two rotational degrees of freedom) manufactured by Hexagon. The software used on the CMM is PC-DMIS 2018. Scanning was performed with a structured light scanner from Steinbicher using the required softwares (Colin3D, InspectPlus and GOM Inspect). A direct comparison of the measurement procedures on the CMM and the scanner of one product obtained on a 3D printer is given below.
In view of the ever-increasing globalisation of economy, the removal of technical barriers to tra... more In view of the ever-increasing globalisation of economy, the removal of technical barriers to trade has become a central political task. To establish the preconditions for free trade throughout world, the World Trade Organization adopted agreement encouraging the development of mutual recognition agreements and of international conformity assessment systems. Such agreements are based on mutual confidence and manifest the final result of a continuous and close cooperation programme essentially consisting of three major elements: the harmonization of accreditation criteria and operation procedures, a comprehensive programme of interlaboratory comparisons and peer assessments by an international team of experienced accreditation experts. Gauge block calibration is one of the oldest high precision calibrations made in dimensional metrology. The most accurate measurements of gauge blocks have not changed appreciably in accuracy in the last 70 years. What was changed is the much more wide...
Surface geometry of technical parts can be divided on roughness, waviness and deviation of form. ... more Surface geometry of technical parts can be divided on roughness, waviness and deviation of form. Surface roughness is micro-irregularities developed in the process of metal cutting. Cutting-tool edge and condition of the same, and other various factors such as vibrations, rigidity of tool-workpeace system and etc cause those irregularities. All methods for surface metrology can be divided on contact and non-contact methods. In this article we discussed main parameters of roughness such as Ra, Rmax, R z , Rq, Rp, Rt. For testing is used Perthometer Concept device. Preparation and procedure for measurement is according to procedure given in working instructions of the same device.
This paper describes a new mathematical model for stress concentration factor of rectangular bar ... more This paper describes a new mathematical model for stress concentration factor of rectangular bar with opposite edge U-notches subjected to tension. Determination of model parameters is achieved by combining the design-of-experiment technique implemented in MATLAB software and the numerical simulation using FEMAP software. The design-of-experiment technique is used to obtain a variety of combinations of geometrical parameters, ie. experimental points, whereas the numerical simulation is applied to thus obtained experimental points. Results agree well with the data given in literature. This procedure for determination of stress concentration factors could be applicable for other stress concentration cases.
Gauge block calibration is one of the oldest high precision calibrations made in dimensional metr... more Gauge block calibration is one of the oldest high precision calibrations made in dimensional metrology. Gauge block comparison schemes are designed with a number of characteristics. The unknown length of a block is determined by measuring the difference between it and a reference block of the same nominal size and then calculating the unknown length. The sources of variation in measurements are numerous. Source of serious problems, which is not random, is the drift in the instrument readings. The instrumental drift can be obtained from any comparison scheme with more measurements than the number of unknown lengths plus one for the drift, since the drift rate can be includes a parameter in the model fit. This effect cannot be minimized by additional measurement because it is not generally pseudo-random, but a nearly monotonic shift in the readings. In this paper some techniques for drift eliminating of instrument are discussed.
The testing/calibration laboratories shall demonstrate their performance through their participat... more The testing/calibration laboratories shall demonstrate their performance through their participation in appropriate proficiency testing (PT) schemes by means of interlaboratory comparisons. Proficiency testing is the determination of laboratory testing performance by means of interlaboratory test comparisons. Interlaboratory comparison is the organization, performance and evaluation of tests on the same or similar test items by two or more laboratories in accordance with predetermined conditions. Participation in proficiency testing scheme provides independent verification of laboratory competence. It demonstrate to the publics, customers, accreditation bodies, regulators and management that procedures are under control and gives technical confidence in the service which laboratory provide.
Uploads