Model description of the 21TT dual channel lathe CNC system:
The 21TT dual channel lathe CNC system is a CNC product developed for dual channel machine tools. Adopting an 8.4 "color LCD, it has 6 feed axes, 2 analog spindles, 2 encoder feedback channels, and 2 manual pulse channels. Supporting multiple applications such as dual spindle/dual tool holder, single spindle/dual tool holder, dual spindle/single tool holder, etc., it has functions such as synchronous control, hybrid control, overlap control, interference detection, etc., which can meet the application needs of dual channel machine tools.

The functional features of the 21TT dual channel lathe CNC system:
Adopting an 8.4 "color LCD, it has 6 feed axes, 2 analog spindles, 2 encoder feedback channels, and 2 manual pulse channels. Supporting multiple applications such as dual spindle/dual tool holder, single spindle/dual tool holder, dual spindle/single tool holder, etc., it has functions such as synchronous control, hybrid control, overlap control, interference detection, etc., which can meet the application needs of dual channel machine tools.
2 channels, 6 feed axes, 2 analog spindles, and 2 encoder feedback channels. Two hand veins.
Minimum control accuracy of 0.1um, maximum moving speed of 60M/min
Standard servo unit, servo motor position feedback using 2500 line encoder
Adapting to servo spindles can achieve spindle orientation, rigid tapping, cylindrical interpolation, and polar coordinate interpolation.
Support dual spindle/dual tool holder, single spindle/dual tool holder, dual spindle/single tool holder applications
Built in PLC, ladder diagram online display, real-time monitoring, expandable serial I/O unit
It has unique functions such as simple synchronization control, hybrid control, overlap control, inter channel interference detection, and waiting for M code.
Equipped with hand pulse test cutting, hand pulse interruption function, and teaching function;
Equipped with online machine tool debugging guide, auxiliary programming, trajectory preview, macro variable annotation/customization, direct input of graphic dimensions, and other functions;
MDI Multi Program Segment Execution
8.4-inch true color LCD, supporting multiple displays such as Chinese, English, Russian, etc
The system has a balanced cutting function, which allows the cutting feed in both channels to be executed simultaneously. Suitable for processing slender workpieces, it can prevent workpiece bending caused by one-sided processing, thereby ensuring the machining accuracy of the parts.
The system has a hybrid control function, which means that any axis between two channels can be interchanged to achieve movement control of axes between channels.
The system has an overlap control function, which allows the axis that executes the movement instruction (overlapping sub control axis) to superimpose the movement amount of other axes (overlapping main control axis) on the movement amount









Special advantages of the 21TT dual channel lathe CNC system:
1. Speed advantage
·The maximum fast movement speed can reach 60m/min
·The maximum cutting speed can reach 30m/min
·Cutting feed: Front acceleration and deceleration linear type, Front acceleration and deceleration S-shaped type, Rear acceleration and deceleration linear type, Rear acceleration and deceleration exponential type
·Fast movement: front acceleration and deceleration straight line type, front acceleration and deceleration S-shape type, rear acceleration and deceleration straight line type, rear acceleration and deceleration index type
·Thread cutting: linear and exponential can be used
·The starting speed, ending speed, and acceleration/deceleration time are set by parameters
·Program preprocessing can achieve smooth and seamless connection between program segments; Smooth transitions can be selected between program segments
2. Precision advantage
·Screw pitch compensation, memory type pitch error compensation, maximize machining accuracy
·1ms high-speed interpolation, with control accuracy of 1 μ m and 0.1 μ m optional, significantly improves the efficiency, accuracy, and surface quality of part processing.
3. Interface advantages
·Users can edit the I/O logic control by themselves, with 18 inputs and 18 outputs. The input signal can achieve online switching between high and low levels
·PLC program communication download
·USB removable USB copy interface, capable of implementing USB DNC function, external massive storage, system upgrade, parameter and ladder map copy/restore
·RS232: Bidirectional transmission of part programs, parameters, and other files, supporting PLC program and system software serial port upgrades
·Can be equipped with external handwheel or panel handwheel
·Spindle frequency conversion control, feed axis pulse control
4. Operational advantages
·Full screen editing system, online modification of knife repair, parameters and other operations
·Two dimensional tool path display, with graphics that can be enlarged, reduced, or translated freely, and the orientation of the graphic coordinate system can be changed
·It can achieve multi-level password protection, such as program, parameter, and ladder diagram protection, which is convenient for on-site management
·Compatible with mainstream CNC system instruction codes both domestically and internationally
·Real time adjustment of spindle, feed rate, and fast speed
·Any program segment starts processing, any tool number starts processing
·During the processing, switch between single segment and continuous at will
·Support handwheel trial cutting function
·Support program/program segment/word retrieval, modification, deletion, copying, and pasting
·Can view alarm records for easy identification of program errors or machine malfunctions
·Support the help function, which allows you to view the code meaning and operation instructions
·Support online editing of PLC
·Supports multiple PLC programs (up to 20), and the currently running PLC program can be selected
·Switching between Chinese and English interfaces
·User defined I/O
Basic functions
Function |
21TT (pulse type) |
21TT-M2 (bus type) |
Limit the number of control axes |
5 |
28 |
Channel limit |
2 |
8 |
Limit on the number of axes within the channel |
5 |
8 |
Analog voltage port |
2 |
3 |
Number of pulse servo spindles |
1 |
2 |
Number of bus servo spindles |
- |
Depends on the number of system axes |
Encoder input port |
1 |
2 |
Axis type |
linear axis rotation axis |
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synchronous shaft |
support |
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Cs axis control |
support |
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interpolation cycle |
1.024ms |
1ms |
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Minimum instruction value |
0.001mm |
0.001mm~0.000001mm |
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Maximum instruction value |
±999999.999mm |
±999999.999mm ~ ±999.999999mm |
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Maximum Rapid Speed |
Unrestricted rapid magnification: F0, 25, 50, 100% |
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Maximum feed rate |
Unrestricted feed rate: 0% to 150% |
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Electronic gear ratio |
1~4294967296 |
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positioning |
G00 |
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Interpolation function |
Linear interpolation G01 Circular interpolation G02/G02 (supporting spiral interpolation function) Polar interpolation G12.1/G13.1 (for processing special end face products) Cylindrical interpolation G7.1 |
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Thread function |
G32 (single blade thread, supports smooth connection of continuous threads with different lead lengths, 8-shaped oil groove and other functions) G32.1 (digital thread) G32.2/G32.3 (circular arc thread) G34 (variable pitch thread) G92 (thread cycle, straight and tapered threads, metric and imperial, single head and multi head threads Any thread cutting angle G76 (Thread Composite Cycle) |
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Tapping function |
G84 (End face rigid tapping cycle) G88 (outer circle rigid tapping cycle) Support encoder following tapping, interpolation synchronized tapping |
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Coordinate system function |
Plane selection G17~G19 Polar coordinate programming G15~G16 Local coordinate system G52 Machine coordinate system G53 Workpiece coordinate system G54-G59 Additional coordinate system G54P1~P99 Coordinate system rotation G68.1~G69.1 |
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Reference point function |
Automatic return to mechanical zero point G28 Automatically return to reference point (2nd, 3rd, 4th) G30 |
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Simplify programming |
Single fixed cycle Composite fixed cycle Drilling fixed cycle Tapping fixed cycle Chamfering (C) and rounding programming (R) Linear angle programming (A) |
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Signal jump function |
G31 (encountered external signal jump during feed operation) G160 (skipping torque limit) |
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User macro program |
Support B-class macro programs; Customize user macro program calls; Macro variable Chinese interface design |
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Tool function |
Number of knife offset: 64 Number of cutting tools: unlimited (determined by the machine tool holder/tower) Blade tip radius compensation, tool wear compensation Support program modification, tool adjustment, and data supplementation Knife alignment function: absolute knife alignment, relative knife alignment, knife compensation value adjustment, overall offset, etc |
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Spindle function |
Gear control (S1~S4); analog control Spindle magnification ranging from 0% to 150%; Analog voltage 0-10V Servo spindle (spindle positioning, speed/position mode switching) Multi spindle control: M03 M04 M05 M103 M104 M105 M203 M204 M205 ... |
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Accessibility |
Supports M-code with arbitrary digits and customizable M-code functionality |
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High speed and high-precision function |
Multi segment preview, supporting multiple types of acceleration and deceleration curves for selection Speed smoothing processing Pitch error compensation work (216 points on each axis) Reverse gap compensation |
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PLC function |
Open PLC, ladder display and real-time monitoring, supporting multiple PLCs Pulse type with 48 inputs and 30 outputs Bus type with 64 inputs and 46 outputs (expandable to 1024/1024 points) |
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Extended output port control |
M20, M21 (extended output port level output mode or pulse output mode) |
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Repeat automatic feeding |
M35, M34 (suitable for automatic loading and unloading function, detecting and repeating continuous loading) |
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manual operation |
Manual multi axis feed, zero return, single step feed, handwheel feed Manual auxiliary function operation |
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Safety protection function |
Positive and negative direction hard limit First, second, and third positive and negative direction soft limit Emergency stop User defined alarms (16 channels) Permission and password management Usage period permission function (can be set and revoked at any time without on-site processing) |
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Debugging function |
single-section operation Machine tool lock Handwheel trial run (supporting handwheel retraction) |
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Graphic function |
Processing trajectory display function Quick preview function for processing shapes C-knife repair trajectory preview function Graph zoom function, graph translation and rotation function |
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Function |
21TT (pulse type) |
21TT-M2 (bus type) |
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Display Edit |
feed rate Modal information Processing time Workpiece counting ... |
feed rate Modal information Processing time Workpiece counting ... Load rate display of each axis motor Display of motor speed for each axis |
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256M large capacity program memory 800 stored programs Support program insertion, modification, deletion, copying, with Chinese character annotation input function | |||
power supply |
Single phase AC220V ± 10%, 50HZ ± 1% |
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Driver interface |
Method 1: "Pulse+Direction" Method 2: "AB Orthogonal"Method 3: "MII Bus Protocol" |
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communication |
RS232 serial communication |
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