Notes
Outline
The Mighty Spindle
Mighty  Spindle Design Goals
Low Cost
High Stiffness
10,000 to 15,000 RPM
Automatic Tool Changer Option
New Features
Mighty Spindle Parameters
1.5 to 2.2 kW
Max Speed of 15,000 RPM
Radial Stiffness at Nose of 87 N/micron
Critical Speed of 23,000 RPM
Mighty Spindle Components
Why A Air Bushing in the Tail?
Thermally Forgiving: Allows thermal expansion of spindle shaft.
No Additional Seal Needed: The air flow provides a pos. pressure air seal.
The Tail Support Assembly
The Bushing is replicated in place to ensure good shaft alignment.
The Tail Assemblyis  Kinematically aligned to housing. Allowing it to be removed for service and replaced WITHOUT messing up the alignment.
Assembly Steps
Tail Support
Front Air Seal
The Hot Swappable Spindle
The Hot Swappable Spindle
No need to recalibrate machine after swap
Kinematic interface is repeatable to sub microns
Cooling the Mighty Spindle
Cooling the Mighty Spindle
Small Cross Section Groove = Better Heat Transfer
Coolant enters at tail to pre-warm it before Nose Bearing Section
Volume Flow Rate of 3 Gal per Hour
No Closed Loop Chiller Needed
Faucet to Drain
The Thermal Model