bmccabe said:
Very good observation.
I have looked at, and devised many tests, to quantify the influence of form errors to measurement data and R&R analysis. What you and I know, but have yet stated, a GR&R will not attribute form error to part variation. When encountered, form error will be assigned to equipment variation (most likely) or operator influences.
bmccabe said:
:This however was not the case with the data collected. The pin was not moved throughout the entire run: The program was set to auto-cycle, and produced a new data set every 40 or so seconds. What you are seeing in the data is the resolution and accuracy of the equipment only (by the design of data collection, not voodoo arithmetic.)
The cyclic behavior in the data is normal for these types of things. It's cause could be changes in dew point (the room is fairly temperature controlled, but relative humidity does change some.) It could be caused by changes in ambient light, or external vibrations, or even phase variations in the electric supply. Who knows... It's under a micron! ...Who cares!!!
The cyclic behavior in the data is normal for these types of things. It's cause could be changes in dew point (the room is fairly temperature controlled, but relative humidity does change some.) It could be caused by changes in ambient light, or external vibrations, or even phase variations in the electric supply. Who knows... It's under a micron! ...Who cares!!!