How to apply Guard Banding to
Gage R&Rs 如何针对Gage R&R运用保护带（缩减工差以补偿测量系统影响）
What is Guard Banding?
什么是保护带？？
什么是保护带
Guard Banding is a technique that is used to reduce  the acceptability limits of a variable gage because the gage error is unacceptably large.
保护带是一种在量具误差过大而不可接受的情况下，用于减少计量型量具合格界限的方法。
Guard Banding can be applied to both one-sided specifications and two-sided specifications.
保护带对单边公差和双边公差都可以运用。
Why Guard Band?
为什么运用保护带？？
长安福特回应被罚
为什么运用保护带
Guard Banding is used to reduce the
probability of sending non-compliant product
to the customer due to excessive gage error.保护带用于减少因过度的量具误差从而交付不合格零件给顾客的可能性。
Guard Banding reduces the engineering
tolerance based on the total standard deviation of the gage R & R.
保护带基于Gage R&R总标准差减少公差带
But ….但是….
Guard Banding can only be used when the gage error is due to significant repeatability issues .保护带仅用于量具误差是由显著的重复性重复性重复性问题引起的情况
And ….并且…
There is not a significant reproducibility issue, or a significant interaction between the operator, part, and/or the gage.没有显著的再现性问题，或者作业者、零件、量具之间的显著交互作用。
What is Significant?
How is Significant defined?
什么是显著的？如何定义显著的？
Something is considered significant when the “p-value”
is less than 1 –the level of significance (1 –the level of significance = alpha risk)
当“P值”小于”1 –显著水平”时被认为是显著的（1 –显著水平= alpha风险）
For example, if the level of significance is 95%, then
the alpha risk is 5% and when the “p-value”is 5% or
less, the item is considered significant.
例如，当显著水平是95%时，alpha风险是5%，当“P值”
为5%或更小时，就被认为是显著的。