Milling Steel
on DMG Mori

Comparison of Cycle Time and the Surface Quality

Standard Spindle v. Air Turbine Spindles®
50% time reduction
Test Parameters:

Linear Milling Depth: Row depth 2.0-0.13 RA
Material: 1.2344 Steel – HSC 30/70
Tool: Ball nose end mill R 2, 0.03mm/z

Cycle Time Comparison

Standard DMG HSC 55 Spindle – 25,000 rpm
Advance: 1,500 mm/min = Cycle Time: 60 minutes

Air Turbine Spindles® 625HSK Spindle – 50,000 rpm
Advance: 3,000 mm/min = Cycle Time: 30 minutes.

Any CNC becomes a high-speed machine in minutes with Air Turbine Spindles®.

Observations on Surface Finish:

The quality at Ra 0,13mµ and precision were indistinguishable between the 25,000 rpm DMG HSC 55 spindle.

Load your Air Turbine Spindles® automatically from any CNC magazine into your main spindle. Clean dry compressed air is induced through a clean airline, or an optional patented mounting block and collar, for seamless integration in your program. No manual hook up required unless preferred.

Maintain constant high speed on the tool path at 25,000 to 90,000 rpm with power to 1.4hp (1kW) – You keep constant high rotational speed in angles and hard materials. This is because Air Turbine Spindles® patented governor increases airflow in the turbine in proportion to the load. Reliable with low vibration, no heat, and no duty cycle for 24/7 milling.

Our direct drives have only 2 moving parts – our proprietary turbine and ceramic bearings, and the bearings are cooled by turbine airflow. No High-frequency brushes, no gears to burn up, no control system.

Just connect to 90 psi / 6.2 Bar and high-speed Air Turbine Spindles® and mill, drill, and accelerate your feeds with no duty cycle. No control system or lubrication required.

625 Series Spindles


For European clients, please contact
Mr. Wolfgang Pfahler [email protected] | Tel: + 49 171 651 3614

Thanks to DMG Mori for this comparison test at DMG Mori Seiki’s Geretstreid Showroom near Munich.

Service & Support

Support is always available from our technical team in the USA, Germany and Mexico. Repair Service is available in Florida and Munich.

Call our factory technicians at +1-561-994-0500 or email us at [email protected].