Statistical Gage Repeatability Verification Standards for Relocated Production Fixtures
Relocating production fixtures mandates statistical gage re-verification via ANOVA Gage R&R and Type I studies to prove repeatability under new plant dynamics.
Kinematic Location Pins
Meaning
Alignment components use the principle of exact constraint to position a part repeatably without over-constraining it. Kinematic location pins ensure that a circuit board or mechanical assembly sits in the exact same spot every time it is placed in a fixture. The system relies on six points of contact to eliminate all six degrees of freedom.
Constraint Method
Proper design avoids the mechanical stress that occurs when two parts are forced together at too many points. Using kinematic location pins allows for thermal expansion and contraction without losing the reference position. This approach is superior to traditional dowel pins for high-precision optical or radio testing.
By providing exactly six contact points, the fixture ensures that the part is held firmly without being deformed by the clamps.
Mechanical Repeatability
Sub-millimeter accuracy in automated testing depends on the part being in a known location. When kinematic location pins are used, the test probes always land on the correct pads on the board. This reduces the number of false failures caused by poor contact or misalignment.
Fixture Stability
Heavy use of a production jig can wear down the mating surfaces and introduce slop. The materials used for kinematic location pins are typically hardened steel or ceramic to resist this wear. Maintaining these pins is an essential part of the preventative maintenance schedule for any precision assembly line.