Professional Instruments Company currently manufactures ISO spindles in three standard sizes:

ISO 2.25

ISO 3.0

ISO 3.375

The ISO 5.5 High Capacity Air Bearing Spindle is well suited for a wide variety of Precision spindle applications.  Available with water cooling and vacuum through the spindle it is commonly used for direct machining of optical surfaces.

ISO 5.5 downloads
STEP file

Professional Instruments Company’s standard line up of ISO spindles are supplied with brushless DC motors, PWM drive amplifiers and precision encoders. Thermal growth in these spindles is controlled through the use of integral cooling jackets which surround both the air bearing spindle and the brushless DC motor. The level of spindle thermal growth control is only limited by the capacity and sophistication of the chiller unit used to control the temperature of these spindles.

Professional Instruments ISO precision air bearing spindles are being used in many machining applications such as the direct machining of optics as work spindles and flycutting spindles, raster flycutting of optical molds, grinding of SiC optical molds and a wide variety of ID and OD grinding applications in many materials.Special versions of these spindles are being used extensively by the computer disk drive industry. If your spindle requirements can not be handled by our standard line of spindles please feel free to contact us for custom designs.

The full range of Professional Instruments Company spindle attachments including piloted chucks, rotary unions, rotor grounding systems, and other enhancements is available. All of the spindles are dynamic two-plane balanced to ensure smooth, vibration-free operation.