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The SFA Series Sphere Fit Adapters are used in conjunction with our BEX Series extension bars and various SMR holders having 1/4" shafts.  This type of  assembly (photo below) is often used to locate and specify points using a sphere-fit routine*.  The SFA is handy for targeting tooling balls, or our own Construction Ball (CB) targeting aid.  It is especially useful for measuring points which are obscured from view.  Using the SFA (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 SFA includes a 6-32 set screw at the bottom of the 1/4" hole (see sketch at left).  This is used to secure the SFA to our BEX extension bars. Model "A" Offset SFA 1.000" SFA-25MM 25 mm

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* A "sphere fit rod" assembly (above, right) may be constructed from a BEX Bar Extension, an SMR adapter, and an SFA Sphere Fit 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 SFA is held against a tooling ball.