HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 20)

TNC 426/TNC 425/TNC 415 B/TNC 407 1-2
1 Introduction
1.1 The TNC 400 Series
The TNCs are shop-floor programmable contouring controls for boring
machines, milling machines and machining centers with up to 5 axes.
They also feature oriented spindle stop.
Two operating modes are always active simultaneously: one for machine
movements (machining modes) and one for programming or program
testing (programming modes).
TNC 426
The TNC 426 PA features digital control of machine axis speed. This
provides high geometrical accuracy, even with complex workpiece
surfaces and at high machining speeds.
An integrated 170 megabyte hard disk provides storage for programs that
were created on external devices. The TNC 426 also offers an on-screen
pocket calculator.
TNC 425
The TNC 425 also features digital control of machine axis speed. This
results in high geometrical accuracy, even with complex workpiece
surfaces and at high machining speeds.
TNC 415 B
The TNC 415 B uses an analog method of speed control in the drive
amplifier. All the programming and machining functions of the TNC 425
are also available on the TNC 415 B.
TNC 407
The TNC 407 uses an analog method of speed control in the drive
amplifier. Some functions are not available on the TNC 407, such as:
• Graphics during program run
• Tilting the machining plane
• Linear movement in more than three axes
Technical differences between the TNCs
TNC 426 PA TNC 426 CA TNC 425 TNC 415 B TNC 407
Speed control Digital Analog Digital/analog Analog Analog
Block processing time 4 ms 4 ms 4 ms 4 ms 24 ms
Control loop cycle time:
Contouring interpolation
3 ms 3 ms 3 ms 2 ms 6 ms
Control loop cycle time:
Fine interpolation
0.6 ms --- 0.6 ms 0.6 ms ---
Program memory 170 M byte 170 M byte 256 K byte 256 K byte 128 K byte
(hard disk) (hard disk)
Input resolution 0.1 µm 0.1 µm 0.1 µm 0.1 µm 1 µm