New requirement for MSA

I didn't mean to imply your customer is Ford. It's just where I have found this information.

I am still not understanding the +/- 2 standard deviations or the USL - lower boundary of 0. Is this a setting in Minitab? Or something I have to physically select in the population? How can you subtract 0 if the lower boundary is 0? Also I have never delved into Ppk when it comes to Gauge R&R, but it also has acceptability for one-sided tolerances if Ppk<1. Also, we are somewhat new to ANOVA method because we traditionally used average and range. If my USL is 0.4mm for a one sided tolerance, and the lower is 0, does this mean that I have to make adjustments to the machine to make parts that will be at the low end and high end of the 0.4mm range? This proves to be difficult with some of the processes.

On another note, what about non-repeatable features? Is there anything in the standard that excludes non-repeatable measurements? Take torque for instance…its not an extremely repeatable measurement. What about joint articulation torque, where your spec is 0.3-0.7Nm on a 2 piece shaft that can be up to 1800+mm long? With that kind of tolerance, I noticed that anything we got that was over .03Nm difference was starting to cause us to go over 10%. Thats ridiculous. Could this not just be covered by calibration for accuracy?

What about plunging force on a joint? The spec for this after being added and greased is ~240-245N, so traditionally since that tolerance was so wide, we were able to get semi-passing R&R, but is it necessary to try and achieve R&R on a non-repeatable feature?

The +/- 2 requirement is new and Minitab has not caught up with this yet. You will have to determine this manually using the Minitab results.

Regarding part selection, see my blog on R&R, section on Part Selection.

Regarding one-sided tolerances, see my blog on One-side Tolerances.

Regarding non-repeatable measurements, see my blog on Non-replicable measurements.