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A218 L13 Team Deliverable, image, image, image, image - Coggle Diagram
A218 L13 Team Deliverable
accuracy
how close to the reference value
Bias
deviation between average measurement and reference value of the standard
bias%=bias/tolerance or process deviation *100
Bias is high due to -not following measurement procedure-error in measuring reference value -instability in measurement
precision
same part same equipment different operator
repeatability -same operator same part same equipment
Case Study Data Analysis
(Crossed GR&R)
Variance Components
total gage R&R = 1.41 (<9%): measuring system is acceptable
part to part = 98.59%: high % means system can distinguish between parts
process variation is higher % than measurement variation = good
Gage Evaluation
study variation = 11.88% (<30%) which is acceptable level
NDC = 11 (>5) which is of acceptable level of recommendation of 5 or more
R Chart & Xbar Chart
RChart:
operator 1 shows more variability in their measurement
Xbar Chart:
4 out of control points means part to part variation is greater than expected
Two way Anova
p value of pipe = 0.000 (<0.05)
p value of nozzle*operator = 0.981 (>0.05) means interaction is insignificant
Case Study Data Analysis
(Gage Run Chart)
part 6 shows measurement variation --> operators having difficulty in measuring
not close to mean and they both measured a higher value the second time
linearity check
when the part is small the measurement will be higher than the reference value
we look for the p value of the slope, then look at the reference value which is the alpha(0.05).
if more than 0.05, would be insignificant, acceptable.
