Parts and Definitions of Spindle

Spindle Parts and Definitions

Different spindle styles, belt driven or integral motor spindles, have specific parts and components. Most of these types of spindles can be controlled using a CNC machine. Using a CNC machines allows for precision and perfection. A CNC machine uses x, y, and z coordinates to create accurate marks, cuts, and grindings.

Spindle Housing

Shaft and motor are housed together, transfers all forces from the spindle

Locates and supports bearings

If oil is used, must have holes to deliver to the bearings

Cooling liquid is used to remove heat

May be block, foot mount or flange mount


Spindle Bearings –Type, Quantity, Mounting, Lubrication Method

Design– tapered, angular contact, precision

Contact Angle- Angle between ball-to-race contact line and plant through ball center

Provide precision, load carrying capacity, speed

Determines ratio axial: radial loading

12°, 15°, 25°

Lower the angle –greater load carrying capacity

Higher the angel- higher axial loading capacity

Preload – light, medium, heavy

Light- max speed and less stiffness

Heavy– less speed, higher stiffness

Configurations – groups of two or three

Face to Face– creates an X, not very common, withstand both axial and radial

Back to Back- creates an O/DB, most common, provides good accuracy and rigidity

Tandem– creates a DT, uses a combination of configurations, spacers are used

Construction – Hybrid Ceramic

Do not react to steel raceways

Operate at lower temperatures

Lower vibration Levels

Roller Bearings

Spindle Motor belt type- motor spindle- capacity-size

Spindle Shaft tool system used tool retention draw barspindle-block-foot-mount-flange