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cnc parts

Variable Frequency Drive

What is VFD?

Are the inverter and VFD the same?

A variable frequency drive (VFD) is a type of electric motor driven by a motor controller, which is supplied to the electric motor by changing the frequency and voltage. Other names of VFD are variable speed drive, variable speed drive, variable frequency drive, AC drive, micro drive and inverter.

Frequency (or Hertz) is directly related to the speed of the motor (RPM). In other words, the faster the frequency, the faster the RPM. If the application does not require the motor to run at full speed, the VFD can be used to reduce the frequency and voltage to meet the requirements of the motor load. As the application program changes the motor speed requirements, the VFD can simply increase or decrease the motor speed to meet the speed requirements.

How does a variable frequency drive work?

The first stage of a variable frequency AC drive or VFD is a converter. The converter consists of six diodes, similar to the check valve used in the piping system. They only allow current to flow in one direction. The direction indicated by the arrow in the diode symbol. For example, as long as the A-phase voltage (voltage similar to the pressure in a pipe system) is more positive than the B-phase or C-phase voltage, the diode will open and allow current to flow. When Phase B becomes more positive than Phase A, the Phase B diode will turn on and the Phase A diode will turn off. The same is true for the three diodes at the cathode of the bus. Therefore, when each diode turns on and off, we get six current “pulses”. This is called “six-pulse VFD”, which is the current standard configuration of variable frequency drives.

Let us assume that the drive is running on a 480V power system. The 480V rating is “rms” or root mean square. The peak value on the 480V system is 679V. As you can see, the DC voltage of the VFD DC bus has AC ripple. The voltage is approximately between 580V and 680V.

We can eliminate the AC ripple on the DC bus by adding a capacitor. Capacitors operate similarly to reservoirs or accumulators in a pipeline system. The capacitor absorbs AC ripple and provides a smooth DC voltage. The AC ripple on the DC bus is usually less than 3 volts. Therefore, the voltage on the DC bus becomes “approximately” 650VDC. The actual voltage will depend on the voltage level of the AC line supplying the drive, the voltage imbalance level on the power system, the motor load, the impedance of the power system, and any reactors or harmonic filters on the drive.

A diode bridge converter that converts alternating current to direct current is sometimes simply called a converter. The converter that converts direct current back to alternating current is also a converter, but to distinguish it from a diode converter, it is usually called an “inverter.” In the industry, it has become common to refer to any DC-AC converter as an inverter. When we turn off one of the top switches of the inverter, this connection of the motor is connected to the positive DC bus, and the voltage on this phase becomes positive.

When we close one of the bottom switches in the converter, that phase will be connected to the negative DC bus and become negative. Therefore, we can make any phase on the motor positive or negative at will, so that any frequency we need can be generated. Therefore, we can make any phase positive, negative or zero.

Please note that the output of the VFD is a “rectangular” waveform. VFD will not produce sinusoidal output. For general distribution systems, this rectangular waveform is not a good choice, but it is completely suitable for electric motors.

If you want to reduce the motor frequency to 30 Hz, you only need to switch the inverter output transistor more slowly. However, if the frequency is reduced to 30Hz, the voltage must also be reduced to 240V to maintain the V/Hz ratio (for this, please refer to the introduction of VFD motor theory). If we only have 650VDC, how can we reduce the voltage?

This is called pulse width modulation or PWM. Imagine that we can control the pressure in the water pipeline by opening and closing valves at high speeds. Although this is impractical for piping systems, it works well for VFDs. Please note that in the first half of the cycle, the voltage is on for half of the time and off for half of the time. Therefore, the average voltage is 480V or half of 240V. Through the output pulse, we can obtain any average voltage on the output of the VFD.

Why use VFD?

1- Reduce energy consumption and energy costs
If your application does not need to run at full speed, you can reduce energy costs by using a variable frequency drive to control the motor, which is one of the advantages of a variable frequency drive. VFD allows you to match the speed of electric equipment to load requirements. No other AC motor control method can achieve this goal.
Today, motor systems account for more than 65% of industrial energy consumption. By installing or upgrading to a VFD to optimize the motor control system, the energy consumption of the factory can be reduced by up to 70%. In addition, the use of VFD improves product quality and reduces production costs. Combining energy efficiency tax incentives and utility rebates, the return on investment of VFD installations can be as short as 6 months.

2- Increase production through stricter process control
By running the motor at the most efficient speed for your application, you can reduce the occurrence of errors, thereby increasing the level of production and thus earning higher revenue for the company. On conveyors and belts, you eliminate jitter at start-up, thereby achieving high throughput.

3- Extend equipment life and reduce maintenance
When the equipment is controlled by a VFD to ensure the best motor application speed, the service life of the equipment will be longer, and downtime will be reduced due to maintenance. Since the VFD can optimally control the frequency and voltage of the motor, the VFD will provide better protection for the motor from electric thermal overload, phase protection, undervoltage, overvoltage and other problems. The motor or driving load will not be subjected to the “instantaneous shock” when the entire line is started, but it can start smoothly, thereby eliminating the wear of belts, gears and bearings. This is also an excellent way to reduce and/or eliminate water hammer, because we can achieve smooth acceleration and deceleration cycles.

Which motors can the inverter control

Variable-frequency Drive, VFD is a power control device that uses variable frequency technology and microelectronics technology to control AC motors by changing the frequency of the motor’s working power supply. The frequency converter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit and micro processing unit. The inverter adjusts the voltage and frequency of the output power supply by opening and closing the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter has many protection functions. , Such as overcurrent, overvoltage, overload protection and so on. With the continuous improvement of industrial automation, frequency converters have also been widely used.
The inverter can control:

General purpose motors

This is used in occasions where torque removal, speed and accuracy are not required.
Used on the fan and water pump, it has good energy saving and automatic control effect

Vector control inverter

Generally used to control the frequency conversion special motor can also be a general-purpose motor
Vector control features have good control over large torque, load changes, and angular velocity accuracy on speed

Servo-controlled inverter

Generally used to control frequency conversion special motors. Compared with vector, it has better control function and control effect. Of course, it is more complicated.

How does the inverter change the frequency

The inverter converts direct current to alternating current through an inverter circuit Change the output frequency and voltage by triggering the frequency of the IGBT and the size of the conduction angle

How is VFD connected to PLC?

The inverter can be connected to the PLC via Rs485 or Ethernet, so you need to consult whether it supports it before purchasing.

How to save energy during the work of the inverter?

The inverter realizes energy saving by feeding back to the grid.

There are two working modes of motor work: electric and brake. When the motor is braking, it is equivalent to a generator, and the inverter realizes energy saving by feeding back the electric energy generated by the motor to the grid for utilization.

Although the energy feedback of a single motor has a small contribution to energy saving, there are often a large number of motors working in a factory, and the power is large. In this way, the electrical energy of these motors’ braking turntables is collected and fed back to the grid for further processing. Utilization can save a lot of energy.

Does the variable frequency drive damage the motor?

The damage of the inverter to the motor includes two aspects, the damage of the stator winding and the damage of the bearing. This kind of damage usually occurs within a few weeks to more than ten months. The specific time depends on the brand of the inverter, the brand of the motor, the power of the motor, the carrier frequency of the inverter, the length of the cable between the inverter and the motor, and the ambient temperature. Many factors are related. The early accidental damage of the motor brings huge economic losses to the production of the enterprise.
This loss is not only the cost of motor repair and replacement, but also the economic loss caused by unexpected shutdown. Therefore, when using a frequency converter to drive a motor, sufficient attention must be paid to the problem of motor damage.

How many motors can one frequency converter control?

If the motors are connected in parallel, please note that it depends on the power of the inverter.

If the controlled motors all work separately, only one can be controlled

How to choose the right inverter for the motor

When we select the inverter, we need to follow the type of the controlled object, speed range, static speed accuracy, starting torque, etc., so that it meets the process and production requirements while being easy to use and economical.
The general experience is that the size of the motor should be the size of the inverter, and sometimes the size can be larger.   
The power factor of the high-power inverter is lower, it is better to install an AC reactor at the input end of the inverter. One is to improve the power factor, and the other is to suppress high-frequency harmonics. If you frequently start and brake frequently, install a brake unit and a brake resistor.   

If you need to reduce noise, you can choose a water-cooled inverter;

If braking is required, a braking chopper and braking resistor are required. Or you can choose four-quadrant products, which can feed back energy to the grid and save energy;   

If there is only a DC power supply on site, you can choose a pure inverter product (using a DC power supply) to drive the motor.

The final basis for the selection of the inverter is that the current curve of the inverter includes the current curve of the mechanical load.

How to control the inverter?

There are three ways to operate the inverter without an external controller (such as PLC):
① Use the buttons on the operation panel;
②Operate the components connected to the terminal (such as buttons and potentiometers);
③Composite operation (such as setting the frequency on the operation panel, operating the button connected to the terminal block for start/stop control).
In order to facilitate operation and make full use of the inverter, PLC can also be used to control the inverter

Can the speed of the inverter exceed the maximum speed of the motor?

Install a frequency converter before the motor, and change the frequency of the motor’s input power supply through the frequency converter to change the motor speed. Because changing the power frequency changes the speed of the rotating magnetic field, it also changes the synchronous speed of the motor.

SKI780 5.5KW 380V VFD Variable Frequency Drive Inverter

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cnc parts

R60X3

Three-axis platform equipment is often required to reduce space and save the cost.R60X3/3R60X3 is the national first three-axis specific drive developed by Ruitech.

R60X3/3R60X3 can drive independently three 2-phase/3-phrase stepper motors with bases below 60.The three-axis micro-stepping and the current are independently adjustable.

—     Pulse mode: monopulse PUL&DIR

—     Signal level: 3.3~24V compatible; serial resistance not necessary for the application of PLC.

—   Typical application: dispensing system, floating machine, carving machine and three-axis test equipment.

R60X3 User Manual

Debugging software

Rtelligent Office Store

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cnc parts

SP14Q009

SP14Q009 Hitachi 5.7 inch LCM 320×240 Monochrome Parallel Data; SP14Q009

  • Part Number: SP14Q009
  • Category: LCD Display
  • Manufacturer: Hitachi
  • Packaging: New Lcd
  • Data Code: 2009+
  • Qty Available: 382

Hitachi SP14Q009 New SP14Q009 Hitachi 5.7 inch LCM 320×240 Monochrome Parallel Data, SP14Q009 pictures, SP14Q009 price, SP14Q009 supplier

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New 5.7″ 320*240 SP14Q009 LCD Scree

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cnc parts

CNC 4th Axis

4th-axis CNC refers to X, Y, Z, and rotary axes. The fourth axis is used to rotate around other axes. Refers to the four-axis machining center.
Types of axis machine tools: cradle, vertical, horizontal, NC table + NC indexing head, NC table +90°B axis, NC table +45°B axis, NC table + general horizontal five Axis linkage CNC machine tool A axis °, two axis NC spindle, etc.
There are two ways of the rotary axis of the vertical five-axis machining center. One is the rotary axis of the worktable. The worktable set on the bed can rotate around the X axis, which is defined as the A axis. 120 degrees.
There is also a rotary table in the middle of the worktable, which rotates around the Z axis, which is defined as the C axis, and the C axis is 360 degree rotation. The advantage of this arrangement is that the structure of the spindle is relatively simple, the rigidity of the spindle is very good, and the manufacturing cost is relatively low.
But the general worktable cannot be designed too large, and the load bearing is also small, especially when the rotation of the A axis is greater than or equal to 90 degrees, the workpiece will bring a great load moment to the worktable during cutting.

4 Jaw Chuck 4th axis
Check more 4 Jaw Chuck 4th axis

4th axis structure

The structure of the fourth axis is: servo motor drive reducer type, servo motor direct drive type. The reducer is a relatively precise machine, and its purpose is to reduce the speed and increase the torque. The types of reducers generally used for four axes are divided into three types: worm gear type, roller cam type, harmonic reducer type.

  • The main feature of the worm gear reducer is the reverse self-locking function, which can have a larger reduction ratio. The input shaft and the output shaft are not on the same axis or on the same plane. However, the volume is generally large, the transmission efficiency is not high, and the accuracy is not high.
     
  • The harmonic drive of the harmonic reducer transmits motion and power using flexible deformation controlled by flexible components. The volume is small and the precision is high, but the disadvantage is that the flexible wheel has a limited life, is not resistant to impact, and is rigid and metal. In comparison, the input speed cannot be too high.
     
  • The Roller Driver (cam roller) transmission application arc surface indexing principle is currently the most accurate motion control method. The work piece is composed of an input shaft (arc indexing cam) and a roller (output shaft). The surface of the cam groove on the input shaft is in line contact with the outer ring surface of the driven roller element on the roller to drive The runner (ie worktable) rotates. The driven roller element uses internal roller bearings to transmit torque during rotation. This working principle guarantees zero backlash, excellent working accuracy and working efficiency, and effectively avoids the loss of internal parts, providing a durable high-precision working state.
     
  • Direct drive motor DD is the abbreviation of direct driver, including torque motor and linear motor, followed by the motor is called DD direct drive motor also called direct drive motor. Due to its large output torque, some companies directly refer to this product as torque servo. Unlike traditional motors, the high torque of this product allows it to be directly connected to the motion device, thus eliminating the need for connecting mechanisms such as reducers, gear boxes, and pulleys, so it will be called a direct drive motor. Since this type of motor is generally equipped with a high-resolution encoder, the product can achieve a level of accuracy higher than that of ordinary servos. And because of the direct connection, the positioning error due to the mechanical structure is reduced, so that the process accuracy can be guaranteed. The characteristics of the direct-drive fourth shaft, because there is no reducer to reduce the torque to increase the torque, so the rotational torque is small, usually in order to increase the torque, the motor coil is larger, so the price is more expensive. The advantage is that the servo-driven four-axis, no intermediate transmission components, no error accumulation, no backlash, so it can be processed at high speed and high precision.

Why to use 4th Axis

The general machine tool has only three axes, that is, copy, that is, the workpiece platform can move left and right (1 axis), back and forth (2 axes), and the spindle head (bai3 axis) is used to cut the workpiece. 360 degree rotating electric indexing head! In this way, bevel holes can be automatically indexed, bevel milling, etc. The advantage of adding a fourth axis to the CNC machining center is

  • It can make the processing plane of the tool more extensive, and can reduce the repeated clamping of the workpiece, improve the overall machining accuracy of the workpiece, help simplify the process, and improve the production efficiency.
  • It can make the plane of the tool processing more extensive, and can reduce the repeated clamping of the workpiece, improve the overall machining accuracy of the workpiece, help simplify the process, and improve the production efficiency. Specifically, the fourth axis refers to the CNC indexing head of the machining center. It can complete the tasks that the three-axis machining center cannot complete at one time. It can realize multi-face machining by rotating, which greatly improves the machining efficiency. Reduced the number of clampings.
  • It can make the processing plane of the tool become wider, and can reduce the repeated clamping of the workpiece, improve the overall machining accuracy of the workpiece, help simplify the process, and improve the production efficiency. Shorten the production time, so many companies need to use a four-axis machining center. The three axes are XYZ three linear movement coordinates. The fourth axis is generally a rotary axis, which can cause an angular offset between the tool and the workpiece. The normal of the workpiece surface is at an angle to expand the processing range.
  • When undertaking external processing tasks, in addition to the normal contour and hole processing on the CNC machine tool, sometimes curve and curved surface parts are also required, which is difficult to complete on the ordinary three-coordinate CNC machine tool At this time, the fourth axis can be installed on the CNC machine tool to expand the machine tool functions and greatly reduce the cost investment. Install the CNC indexing head as the fourth axis on the table of the three-axis CNC machining center. Through this transformation, not only can the processing that requires multiple processes on the CNC machine tool be concentrated in one installation, but also increase the freedom of the machine tool. , Expand its functions, and improve processing accuracy, quality and efficiency.

What is the difference between 4-axis CNC and 3-axis CNC? How to program?

Three-axis machining only has XYZ three axes, and four-axis machining has XYZA or XYZB programming which is relatively cumbersome

Differences

Different structure

The three-axis vertical CNC machining center is three axes of linear movement in different directions, which are up and down, left and right, and front and back. The up and down direction is the main shaft, which can be rotated at high speed; the four-axis vertical machining center adds a new one The axis of rotation, that is, the horizontal plane can rotate 360 ​​degrees, but not at high speed.

The range of use is different

The three-axis machining center is the most widely used. The three-axis machining center can perform simple planar processing, and can only process one side at a time. The three-axis machining center can process very well materials such as aluminum, wood, and lost foam.

The use of four-axis machining centers is less than that of three-axis machining centers. It can realize multi-face machining through rotation, which greatly improves the machining efficiency and reduces the number of clampings. Especially the processing of cylindrical parts is more convenient. And it can reduce the repeated clamping of the workpiece, improve the overall machining accuracy of the workpiece, help simplify the process and improve the production efficiency. Shorten production time.

Programming method:

The four-axis linkage center is divided into horizontal and vertical; if it is horizontal, then add a B axis to the Y axis. The programming method is the same as the 3 axis, but it can rotate 4 sides at a time, and has reached a higher position. Degrees and other precision requirements, when you need to use the fourth axis when programming, just enter B**! It should be noted that when setting up the workpiece coordinate system, care must be taken, each inner surface needs to establish a coordinate system (or sub-coordinate system) such as: G51.1, G51.2. . . . Wait, the vertical is the same as the horizontal capacity, the difference is that the vertical is the A axis, and the horizontal is the B axis.

Analysis of parts drawing

According to the drawing of the part, through the analysis of the material, shape, size and accuracy, surface quality, rough condition and heat treatment of the part, the processing content and requirements are clarified, and the appropriate CNC machine tool is selected.

This step includes:

1) Determine the type or machine tool where the part should be arranged for processing.

2) What kind of fixture or clamping method is used.

3) Determine which tool or how many tools are used for processing.

4) Determine the processing route, that is, select the tool setting point, the starting point of the program (also known as the starting point of the machining, the starting point of the processing often coincides with the setting point), the path of the cutting tool, and the end point of the program (the ending point of the program often coincides with the starting point of the program).

5) Determine cutting parameters such as cutting depth and width, feed speed, and spindle speed.

Determine the process

Based on the analysis of the part drawing, determine the part’s processing technology (such as determining the positioning method, selecting tooling fixtures, etc.) and processing route (such as determining the tool setting point, tooling route, etc.), and determine the cutting amount. The process treatment involves many contents, mainly including the following:

1) Determination of processing method and process route According to the principle of fully exerting the functions of CNC machine tools, reasonable processing method and process route are determined.

2) Design and selection of cutting tools and fixtures When determining CNC cutting tools, comprehensive consideration should be given to factors such as processing methods, cutting amounts, and workpiece materials to meet the requirements of convenient adjustment, good rigidity, high accuracy, and good durability. When designing and selecting CNC machining fixtures, it should be able to quickly complete the positioning and clamping process of the workpiece to reduce auxiliary time.

And try to use combined fixtures to shorten the production preparation cycle. In addition, the fixture used should be easy to install on the machine tool, and it is convenient to coordinate the dimensional relationship between the workpiece and the machine tool coordinate system.

3) Selection of tool setting point Tool setting point is the starting point of program execution. The selection should be based on the principles of simplified programming, easy alignment, easy inspection during processing, and reduction of processing errors.

The tool setting point can be set on the workpiece to be processed, or on the fixture or machine tool. In order to improve the machining accuracy of parts, the tool setting point should be set as much as possible on the design basis or process basis of the part.

4) Determination of the processing route When the processing route is determined, the requirements of the accuracy and surface roughness of the parts to be processed must be ensured; the cutting path should be shortened as much as possible, and the empty cutting stroke should be reduced; the amount.

5) Determination of cutting amount Cutting amount includes cutting depth, spindle speed and feed speed. The specific value of the cutting amount should be based on the provisions of the manual of the CNC machine tool, the material of the workpiece to be processed, the processing content and other process requirements, and be considered in combination with empirical data.

6) Determination of coolant Determine whether coolant needs to be provided during the machining process, whether the tool needs to be changed, and when to change the tool.

Because the parts are processed on the CNC machining center, the process is very concentrated. Under one clamping, it is often necessary to complete roughing, semi-finishing and finishing. When determining the technological process, it is necessary to arrange the processing sequence of each process carefully and reasonably to improve the processing accuracy and production efficiency.

Numerical calculation

Numerical calculation is to calculate the input data required for CNC machining according to the geometric dimensions of the parts and the determined processing route. The general CNC system has the functions of linear interpolation, circular interpolation and tool compensation. For the contour processing of parts with simple shapes (such as parts composed of straight lines and arcs), calculate the starting point and end point of geometric elements, the center of the arc, the coordinate values ​​of the intersection or tangent point of the two elements, etc.

For parts with complex shapes (such as parts composed of non-circular curves and curved surfaces), straight line segments or arc segments are used to approach, and the node coordinate values ​​are calculated from the accuracy requirements. In this case, you need to use a computer to calculate with relevant software.

Write processing program

After finishing the process processing and mathematics processing, according to the instructions, program segment format, technological process, numerical calculation results and auxiliary operation requirements of the CNC system of the machine tool used, write it in sections according to the program instructions and format requirements specified by the CNC Part processing program.

Before programming, programmers must understand the performance, functions and program instructions of CNC machine tools in order to write the correct CNC machining program.

Program input

Enter the written program into the CNC system. There are two common methods:

1) Manual input on the operation panel of the CNC milling machine;

2) Using the DNC (data transmission) function, the program is first entered into the computer, and then the dedicated CNC transmission software. The processing program is input into the CNC system. Then it is called out to execute. Or processing while transmitting.

Program verification

The compiled program must be checked for program operation. Processing procedures should generally be verified and trial cut before they can be used for formal processing. It can be used to check the correctness of the trajectory and movement of the machine tool by means of empty walking and empty running drawing.

On the CNC machine tool with graphic display function and dynamic simulation function or in the CAD/CAM software, it is more convenient to use the method of graphic simulation tool to cut the workpiece for inspection. However, these methods can only check whether the trajectory is correct, and cannot check the machining accuracy of the processed parts

How to upgrade the four-axis engraving machine

Three-axis engraving machine can only process one plane. However, the four-axis engraving machine can process one surface and then process other surfaces at will. Upgrade from three-axis to four-axis, buy a separate cnc rotary 4th axis and a controller using four-axis linkage, it is recommended to use (4 axis offline cnc controller)

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cnc parts

3 jaw self-tightening lathe chuck

3 jaw self-tightening lathe chuck 50mm 2” inch K01-50

The Scroll Chuck is an industrial product with automatic centering. It is mainly used for machine tools in the processing of non-ferrous metals and non-metals.

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cnc parts

Ultra Quiet Brushless Motor Submersible Pool Water Pump

Garden Ultra quiet DC 12V 3M 240L/H Mini Brushless solar Motor Submersible Pool Water Pump

Brushless, permanent magnetic rotor.

Super long working life(more than 30000 hours).

Adopt high performance ceramic shaft.

The axis is enclosed with static sealing, not dynamic, which can avoid leaking problems.

Amphibious design.

Submersible installation and entirely waterproof.

low consumption.

low noise(less than 40db).

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cnc parts

CNC Manual Pulse Generator -39%

CNC Manual Pulse Generator CNC Pulse Encoder 5V 60MM Hand Wheel Pulse Encoder Mill Router Manual Control For CNC System

Material: aviation aluminum

Color: black, white (Optional)
Product type: 6 terminal
Voltage: 5V
Diameter: 60mm/2.36in
Consumption current: ≤100mA
Response frequency :0-20 KHZ
Empty ratio: 0.5 T ± 0.1 T
Mechanical : 500rpm
Normal s: ≤200RPM
Protection: oil proof, water-resistance, dustproof IP54
Working temperature: -10~70℃
Working humidity: 30-85%
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cnc parts

Z023 Dividing Table -38%

cnc Iron 36/40/48 Holes Z023 Dividing Table Indexing Plate Rotary Table Dividend Plate cnc machine

US $1.82
  • The indexing plate is a machine tool accessory that holds the workpiece on the chuck or between two pinnacles and rotates, indexing and positioning it. 
  • The product is mostly used in machine automation equipment.
  • Made of premium iron, more durable.
  • Light weight, easy to install and use.
  • This indexing plate has 36/40/48 holes.
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cnc parts

10pcs 3.175mm Shk 10deg 0.1mm Cutting Bits -52%

10 X 3.175MM Shank 10deg 0.1mm Flat Bottom CNC Router Tools Cutting Bits Carving wood V Shape Engraving tool PCB Cutters

US $4.22 – 4.42 / lot

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cnc parts

3D model relief for cnc in STL file format Small dragon -50%

3D model relief for cnc in STL file format Small dragon

US $0.50

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cnc parts

Bow Plate Sets -34%

5pcs/set Bow Plate Sets CNC Engraving Machine Parts Pressure Plate Clamp Fixture For T-slot Working Table

US $0.63 / lot

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cnc parts

Mach3 Tool Setting Probe -30%

CNC Z Axis Router Mill Zero Check Touch Plate Mach3 Tool Setting Probe Setting Probe Milling DIY 35m CNC Engraving Machine Tools  

US $2.97

Connect the wire of the knife setting tool to the knife setting connector of the control board, and connect the clip to the ground wire of the control wire. (The clip can be added on the main axis, but the main axis and the ground wire should be also connected.) When the cutting tool touches the knife setting tool, the knife setting process is completed.