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The TBA Series Tooling Ball Adapters are used in conjunction with our BXT Series extension bars and various SMR holders having 1/4" or 6mm  shafts.  This type of assembly (photo below) is often used to locate and specify points using a sphere-fit routine*.  The TBA is handy for targeting tooling balls such as our TB.  It is especially useful for measuring points which are obscured from view.  Using the TBA (with its targeting assembly) on hidden points helps you avoid making unnecessary tracker moves and subsequent rebundles, thereby saving time and potential error buildup.  These adapters make more efficient use of your laser tracker equipment while maintaining the accuracy needed for most tasks.

The TBA has a 6-32 set screw at the bottom of the hole (see sketch at left).  This is used to secure the TBA to our BXT extension bars.  Be sure to choose a TBA having the same units (English or metric) as your BXT bar. Model "A" Offset "D" Dia. Fits Sphere TBA-1 1.000" 0.2500" 0.5000" TBA-25MM 25mm 6mm 12mm

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* A "sphere fit rod" assembly (above, right) may be constructed from a BXT Extension Bar, an SMR adapter, and an TBA Tooling Ball Adapter.  It is used to collect points which are all a given distance away from one particular point, making that point the center of an arbitrary sphere.  Then, a sphere-fit routine is used to determine that center point.  Above, the TBA is held against a tooling ball.