World Wide Suppliers of Industrial Sapphire&Ruby Precision Parts

Sapphire to Metal for Fluidic,Metrology&Medical Components

ISO 9001:2019 Mfg&Managment Certified Companies


We serve demanding customers worldwide.With advanced CMM device and innovative
production techniques & systems integrate latest technologies to meet the evolving
needs of our customers.

Contact Details

Chonghong Industries(Microwork)Ltd.

1803,2006,Huachuang Intl Commerce Building

Honghuang 10th Road Jiangbei District 

Chongqing China 400020

Tel: (0086-023) 67937146
Fax: (0086-023) 89119130 


Ruby Ball Cylinder Styli for CMM Probe

In metrology, a stylus is mounted to such probes as kinematic, strain gage and scanning, and acts as the point of contact with the workpiece.

The variety of probe applications on machine tools, CMMs, comparative gages and portable arms makes correct selection of styli usage essential for efficient, reliable and accurate measurement. For CMMs, steel and tungsten carbide are fine for shorter stems, while ceramic or carbon fiber are better for longer stems. Ceramic stems are lighter than tungsten carbide, have stiffness comparable with steel, and are thermally stable—ideal for use in a machining environment.

Ruby balls are exceptionally hard and smooth, with excellent compressive strength and resistance to abrasion. They are manufactured to various levels of precision defined by their grade(Grade 3-Grade 10), which relates to the maximum deviation of the ball from a perfect sphere. Since all ruby balls are completely made in our facility, with our strict and traceable QA control system,we ensure every ruby ball in the styli is precision

Any error in sphericity will increase measurement uncertainty. The two most commonly used ball grades are 5 and 10 (the lower number is better). The more accurate the CMM, the more significant the effect of ball grade. Renishaw recommends grade 5 as standard and offers grade 3 (with sphericity of only 0.08 micron) for the most demanding applications.

Scanning produces more aggressive surface interaction than touch probing, resulting in three issues: debris accumulation, adhesive wear and abrasive wear. Debris is unavoidable, but easily removed with a dry, lint-free cloth. Adhesive wear involves permanent transfer of workpiece material to the ball. This condition eventually degrades the sphericity of the ball. Abrasive wear removes material from the ball or workpiece. 

The ruby ball is best for most scanning applications, including stainless and titanium workpieces.

                                                                                                                              Submitted on Aug.15.2020