A drilling and deburring process has tolerances of plus or minus .001 millimeters.What does the process standard deviation need to be in order for this process to have a capability ratio of 1.67?
A)0.0002 millimeters
B)0.0001 millimeters
C)0.00002 millimeters
D)0.00001 millimeters

Question

Quizplus · Accepted Answer

The capability ratio (Cp) is calculated as (USL - LSL) / (6 * standard deviation). For a Cp of 1.67 and a tolerance of ±0.001 mm, the standard deviation should be 0.0002 mm.

A Drilling and Deburring Process Has Tolerances of Plus or Minus