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lauriewebb
Help! Can someone tell me how to do a Gage R&R study on stopwatches?
Help! Can someone tell me how to do a Gage R&R study on stopwatches?
There is not going to be much variation in the NIST time signal. I would suggest that you experiment with introducing variation by setting several time intervals as your characteristic. Although this is artificial, I don't know of another way to create variation in time. You just need to see what levels the ANOVA will accept. If you had a machined part with a standard of 1.000" and a tolerance of +-.005" you might expect a process variation of +-.002" among the ten parts. This would probably give enough variation to evaluate a standard micrometer. So if you have a characteristic of 60 seconds, you would need to experiment with a group of known different time intervals such as 59, 60, 61, 63, etc which would give you your variation "between parts" so that you can then evaluate how well the watch and the watch operator can agree on each different interval. It might be that seconds is not enough variation you might need ranges of 5 or 10 seconds. On the other hand your system might have enough variation with fractions of seconds, depending on the accuracy of your stopwatch and the reaction time of your operators. This is kind of general, I hope that it helps.We are a TS16949 company. We manufacture brake pads. During our audit in November the auditor wrote us up for not having MSA on a stopwatch that was referenced on our control plan that we use to measure conveyor speed in one of our processes. We also use a stopwatch to measure resin gel time and resin flow which is also listed on our control plan. We conducted initial GR&R using NIST time signal and Direct Comparison Method (Digital DUT). Characteristic of time as one minute interval. Performed as a 3 x 3 x10. Results > 30%. ANOVA shows that the characteristic needs more variation.
We are a TS16949 company. We manufacture brake pads. During our audit in November the auditor wrote us up for not having MSA on a stopwatch that was referenced on our control plan that we use to measure conveyor speed in one of our processes. We also use a stopwatch to measure resin gel time and resin flow which is also listed on our control plan. We conducted initial GR&R using NIST time signal and Direct Comparison Method (Digital DUT). Characteristic of time as one minute interval. Performed as a 3 x 3 x10. Results > 30%. ANOVA shows that the characteristic needs more variation.