Requalification Protocol Execution for Relocated Multiaxis Measurement Jigs
Requalification of relocated multiaxis measurement jigs mandates thermal soak, 21-parameter laser kinematic mapping, and ISO 10360 volumetric acceptance signoff.
Touch-Trigger Probe
Meaning
Discrete point contact sensors generate discrete switching signals upon physical deflection of an internal kinematic contact structure against a component surface. Integrating a touch-trigger probe allows coordinate measuring machines to register individual discrete point locations with high spatial repeatability. The functional scope applies to discrete point measurement routines and excludes continuous high-speed profile scanning operations.
Kinematic Mechanism
Internal seated mechanical contacts hold a stylus sphere in a fixed rest position under spring pre-load. Touch-trigger probe action relies on a three-wire or three-roll kinematic arrangement that breaks an electrical circuit when the stylus deflects against a part surface. Signal processing electronics register the exact encoder positions at the instant of circuit interruption.
Uniform seat contact pressure ensures highly repeatable trigger points across varied approach angles.
Lobing Characteristics
Varying force vectors required to trip the kinematic seat cause directional variations in triggering distance. Measuring with a touch-trigger probe exposes triangular lobing patterns caused by internal mechanical geometry constraints. Calibration routines measure precision reference spheres to map radial trigger variations across three-dimensional vector space.
Software algorithms compensate for lobing effects to refine point measurement accuracy.
Stylus Configuration
Long or heavy stylus extensions increase effective moving mass and increase pre-travel deflection distance prior to contact break. Selecting stylus setups for a touch-trigger probe requires balancing reach requirements against mechanical stiffness and trigger force limits. Ceramic and carbon fiber stems reduce stem bending during high-speed measuring contacts.
Correct stylus selection minimizes measurement uncertainty across complex part features.