Hello, I am new to the whole MSA process. My current project is to do a type 1 study on the gages, then a gage R&R (ANOVA) on the process that uses the measurement tool. After this, the customer would like me to come up with a specification on what the gage can be used for. I would have thought this would pertain to the resolution of the gage but the customer would like the %tolerance to be incorporated in this as well. Has anyone have any experience with this?
% Tolerance - Type 1 study on the gages, then a gage R&R (ANOVA)
- Thread starter nvpeter
- Start date
The customer is just asking you to take the Study Variation and divide by the maximum acceptable %Tolerance to determine the tightest tolerance for which you may use the gage.
Sorry if I am misinterpreting, so lets say if :
tolerance:+/- 0.005"
Study Var: .0111
%Study Var: 19.11%
%Tolerance: 19.99%
the risk of the measurement system is risking making an incorrect decision form the tolerance is 19.99% and so the tightest tolerance for the system should be +/-0.002 more than the usual (.01 * .1999 =~0.002). Or is this entirely wrong.
tolerance:+/- 0.005"
Study Var: .0111
%Study Var: 19.11%
%Tolerance: 19.99%
the risk of the measurement system is risking making an incorrect decision form the tolerance is 19.99% and so the tightest tolerance for the system should be +/-0.002 more than the usual (.01 * .1999 =~0.002). Or is this entirely wrong.
%Tolerance: 19.99% is interpreted as meaning the measurement variation consumes ~20% of the tolerance. Regarding the tightest tolerance that you can use this gage to measure, it depends on what threshold you set for an acceptable %Tolerance. Are you using 10% as the max acceptable? Is 20% acceptable, or 30%? For the sake of the example, let's say that 15% is the maximum acceptable %Tolerance. Divide the study variation by the max acceptable %Tolerance (15% or 0.15) to get the tightest tolerance the gage can measure.
