The repeatability component is the variability of a single operator measuring the same part. The Gage R&R is typically used to evaluate several operators measuring similar parts multiple times. The Gage R&R analysis tool in Minitab examines the repeatability and reproducibility ( R&R ) of a particular measurement system. It is unsurprising that the circle gave the most consistently accurate results, because our spherical samples are exactly circular in profile. The ellipse results were somewhat low for samples 2 and 3 on average. In general, Brugnara’s plugin was least dependent upon operator with errors well within the range of ± 2.5° across all operators. The tightest distribution was the use of LB-ADSA on Sample 3 (120°), but LB-ADSA showed the most operator variation on Sample 2 (90°). It is evident from Figure 8 that DropSnake is very operator-dependent. One can see the scatter (or otherwise) of the operator using each method on any given sample.
The individual operator results are clustered within each method region. Each sample panel is divided into the four methods with red data indicating the average of that method for that sample. The center of each panel contains a green datum which is the average of all measurements for that sample. The abscissa is divided into three panels by sample. Negative responses indicate that the measurement is less than the accepted value and vice versa. The response variable is absolute error (labeled Error(deg) ) which is computed as measured CA minus accepted CA. One useful tool available in Minitab is the multi-variable chart ( Fig.
#Type 1 gage study minitab software
The statistical software package Minitab was used to evaluate the data. These ( B-Circle, B-Ellipse, DropSnake, and LB-ADSA ) are labeled method in the statistical analysis. The Brugnara plugin uses two methods (circle and ellipse) which, together with DropSnake and LB-ADSA, yields four methods of contact angle determination. These three samples are labeled Sample 1 (52°), Sample 2 (92°) and Sample 3 (120°) in the statistical analysis.
Each participant (labeled operator in the statistical analysis) used all three plugins to measure the contact angle of all three samples. Six of the listed authors participated in the study. These height (h) and width (b) values were used with Equation to produce the accepted contact angle values in Table 2. The range of uncertainty in the selection of height and width was less than 5 pixels. The procedure was repeated three times to compute the uncertainty in the contact angle measurement. The dimensions of this rectangle were recorded in pixels. In ImageJ, a rectangular box was drawn that connected the apex of the circle to the two triphase points. The spherical samples used in this work allowed a very accurate measurement of the contact angle using the half-angle method.
This was set to zero for our spherical ball lenses. That sometimes meant upskilling or retraining machinists, or carrying out preventative maintenance on our machinery. The generated charts clearly displayed the sources of variability which helped us to determine the source of variation and take the appropriate actions to rectify this. “We reviewed the Contribution Table and Study Variation Table. Using the type 1 Gage study, Gage R&R (crossed) Study and Attribute Agreement Analysis functions in Minitab, Lee and his team were able to assess the stability and repeatability of their test equipment. People who are new to Minitab can start with The Assistant menu which guides them to select the right tools and analyse their results.” Results The interface is intuitive and the available tools are powerful and comprehensive. Lee also has become a Minitab enthusiast. My colleague learned tricks and tips that enabled her to use Minitab more efficiently and she was also introduced to the Macros function, which she uses to simplify our analyses and reporting.” The examples and data sets used during training were relevant to our work.
#Type 1 gage study minitab how to
“The training from Bizit helped me understand how to apply certain statistical tools, and how to correctly interpret my data. Both Lee and Azura attended Minitab Training and workshops run by Bizit Systems, Minitab’s Independent Licensed Reseller in Malaysia. Lee entrusted one of his project engineers, Noorsalzatul Azura, with the task of using the Gage R&R tools to analyse the test data and present these reports to their customers.
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