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The BP Series Bar Points are used in conjunction  with our BXT Series extension bars and various SMR holders having 1/4" or 6mm shafts.  This type of  assembly (see photo below) is often used to locate and specify various points using a sphere-fit routine*.  The BP is handy for targeting scribe lines, edges, or other points of interest on surfaces or contours.  It is especially useful for measuring points which are obscured from view.  Using the BP with its targeting assembly to measure hidden points allows you to avoid making additional 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.

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The BP includes a 6-32 set screw at the bottom of the hole (see sketch at left).  This is used to secure the BP to our BXT extension bars.  Be sure to match the BP unit type with BXT unit type (English or metric).

*A "sphere fit rod" assembly (right) may be constructed from a BXT extension bar, an SMR adapter, and a BP Bar Point.  It is used to measure a number of points which are all a given distance away from one particular point of interest, making that point of interest the center of an arbitrary sphere.  Then, a sphere-fit routine is commonly used to calculate that center point.  In the picture, the BP is centered on a scribe line.