Mazak VTC-160A, Maintenance Manual, Page: 31 / 96

3-1
3 OUTLINE OF THE MACHINE
3-1 Machine Construction
The machine consists of the following major units (see Fig. 3-1.).
1. Spindle
The spindle is driven by an AC inverter motor and its maximum speed is 10000 min
−
1
(rpm).
A cutting tool is clamped in the spindle by spring force and a hydraulic cylinder is used to force out
the cutting tool from the spindle.
Cooling fluid is circulated around the spindle outer casing to minimize temperature rise of the
spindle due to generation of heat from the bearings.
2. X-axis
The saddle travels right and left, driven by an AC servo motor and a ball screw.
An encoder used for position detection is built in the servo motor.
Linear guides are used as the guide for the saddle to move on the base.
3. Y-axis
The column travels back and forth, driven by an AC servo motor and a ball screw.
An encoder used for position detection is built in the servo motor.
Linear guides are used as the guide for the column to move on the saddle.
4. Z-axis
The spindle head travels up and down, driven by an AC servo motor and a ball screw.
An encoder used for position detection is built in the servo motor.
Linear guides are used as the guide for the spindle head to move on the column.
5. ATC
The roller-cam type ATC mounts/removes a tool to/from the spindle.
6. Magazine
The magazine stores tools. The magazine is driven by an AC inverter motor to index the specified
tool to the tool change position.
7. Table
The top surface is finished with a high precision to be suitable to load workpieces. The table is fixed
to the base not to move.
8. Hydraulic unit
A hydraulic pump generates hydraulic pressure by pumping working oil reserved in the tank to
operate hydraulic actuators.
Refer to 5-4-3 "Hydraulic Circuit Diagram".
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