Star Probe CMM Calibration Artifact

Tree Probe

Part No: PM-STAR-75, also known as a "Tree Probe,"
Shown with Six Inch Steel Ruler

As the C.M.M. probes get more and more complex, the difficulty and complexity of calibrating them becomes more acute.

A typical star probe has five probe spheres that must all be characterized in order to fully utilize the probe. In order to reach around, over and under all of these spherical contacts without moving the calibration sphere all over the place; a multi-sphere artifact must be used.

*Note that the platform shown, PLT-4, is included.

By utilizing a set of five exactly matched calibration spheres that are arranged on orthogonal planes, this job can be done with relative ease. By building one ultra precise, ultra rigid universal artifact that can be used for calibrating even the most complex star probes; we have arrived at an economical approach to this dilemma. Many different diameter spherical artifacts can be used; but the most popular are three quarters of an inch 0.750 ( 19.05mm ) and one inch 1.00 ( 25.4mm ).

The spheres are normally produced from a very high chrome, high carbon Martensitic stainless steel. This ultra fine-grained material is through hardened to 58 HRC (Hardness on the Rockwell "C" scale) minimum. The material is subjected to a three cycle thermal stabilizing process to assure long-term dimensional stability. The sphericity and common size of the balls used on this artifact are held with five microinches (127 nanometers) with a 0.40 microinch (10 nanometers) Ra surface finish. The Young's Modulus of elasticity, or stiffness of these spheres is the same as that of steel parts, so that the highest level of measuring accuracy can be achieved.

This device is also available with ultra precise ceramic balls instead of steel.

For calibrating various optical probes it is also available with satin finished steel, titanium, or ceramic balls.

These optical target balls form a 3D artifact that is effective in evaluating the performance of the optical probe.

Part #	Description	Price	Purchase
PM-STAR-75	STAR PROBE CALIBRATION ARTIFACT WITH 0.75" BALLS	$585.00
PM-STAR-100	STAR PROBE CALIBRATION ARTIFACT WITH 1.00" BALLS	$685.00

See Also, Slim Calibration Sphere

Home

Contact

Products

Quote

Search

Alphabetical Index