Air Turbine Tools® highlights the versatile 625 Series Spindles

Precision and productivity are no longer at odds in the world of high-speed machining. Air Turbine Technology Inc. is setting a new benchmark with its 625 Series Spindles, a revolutionary “All Rounder” solution designed to transform any standard CNC machine into a high-performance engraving and milling powerhouse.

Constant speed under load: the governor-controlled advantage

Unlike traditional coolant spindles that often “fade” or clog during intensive cuts, the 625 Series features a patented governor-controlled turbine. This technology automatically increases airflow to match the cutting load, maintaining constant speeds from 30,000 to 65,000 RPM. The result is a cleaner cut, faster cycle times, and a significant reduction in small tool breakage for tools up to 1/8” (3mm).

Engineered for 24/7 reliability

One of the most critical challenges in high-speed machining is heat management. Air Turbine Technology addresses this with a direct-drive design featuring only two moving parts. By eliminating gears, vanes, and brushes, the 625 Series operates with virtually no thermal expansion, allowing for continuous 24/7 operation without duty cycle limitations. This friction-free architecture not only ensures 2-micron TIR accuracy but also dramatically lowers maintenance and repair costs.

Seamless CNC integration

Designed for versatility, these spindles require only a standard 90 PSI compressed air connection. With support for a wide range of toolholder configurations—including HSK, CAT, BT, and DIN—the 625 Series can be seamlessly integrated into any CNC machine magazine. This allows for full Automatic Tool Changer (ATC) functionality, enabling automated and uninterrupted production workflows.

The 625X Series: extra power for demanding tasks

For manufacturers handling tougher materials or larger tools (up to 1/4” / 6mm), the 625X Series offers a significant performance boost. Utilizing a patented double turbine, it delivers up to 50,000 RPM and 0.76 HP. This makes it the ideal choice for demanding operations like contouring and peck drilling in hard materials, where predictable precision and superior surface finishes are paramount.