RSS using unequal bilateral tolerance
RSS using unequal bilateral tolerance
(OP)
Hi,
I need to know how to go about using an unequal bilateral tolerance when calculating total variation using the RSS tolerance analysis method.
All RSS examples I have seen use uniform bilateral tolerances.
A text I have at work "Dimensional Management" (by Mark Curtis c2002) which includes a section on modified MSRR (pg 166) where he uses a correction factor of K = 1.4 x RSS and 1.7 x RSS. However, as shown, you must multiply K by the RSS previously calculated using uniform bilateral tolerances.
??
I appreciate your respective input,
Buck
I need to know how to go about using an unequal bilateral tolerance when calculating total variation using the RSS tolerance analysis method.
All RSS examples I have seen use uniform bilateral tolerances.
A text I have at work "Dimensional Management" (by Mark Curtis c2002) which includes a section on modified MSRR (pg 166) where he uses a correction factor of K = 1.4 x RSS and 1.7 x RSS. However, as shown, you must multiply K by the RSS previously calculated using uniform bilateral tolerances.
??
I appreciate your respective input,
Buck





RE: RSS using unequal bilateral tolerance
RE: RSS using unequal bilateral tolerance
In lieu of a long explanation, the unequal bilateral tolerance is fixed and must remain on the drawing as .055" +.002"/-.005".
I neglected in the original post to suggest making the unequal bilateral an equal bilateral tolerance so it can be used in calculating RSS, i.e., .0535" +/-.0035"?
RE: RSS using unequal bilateral tolerance
Are you doing the calculations on your drawing, or are you using a spreadsheet. It is easy to set up a spreadsheet to accept whatever is marked on the drawing, and convert it to whatever supports your calculations.
Are you correct in assuming that your tolerances reflect ±3σ? If you made that assumption from my drawings, you would be wrong at least 90% of the time.