Tolerances

1. Holes

   Features of size and location.

2. Characteristics of Geometric Tolerances

         Here is a quick reference chart covering tolerances of form, profile (location of surfaces), orientation,

         location (holes), and runout.

3. Linear Tolerance Analysis

   When analyzing a linear tolerance stack up, if you take the root sum square of  your tolerances, there is a very good probably your limits will fall within this zone. If you have just a few tolerances and you feel lucky you can take the root mean square of your tolerances.

   • RSS (root sum square) 

     The square root of the sum of the square of the tolerances. See Figure 1, below.

   • RMS (root mean square)

     The square root of the sum of the square of the tolerances divided by the number of tolerances. See Figure 1, below.

   Figure 1