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cnc controller

How mach3 reads MBP diagram and converts it into G code

BMP and JPEG bitmap files are loaded bai. This option of MACH3 allows users to generate G-code programs by loading photos. The program will cut different depths according to the different gray levels of the photos, and finally get a workpiece similar to the photo.

First click the Load Image File button to select the image file to be loaded. After the file is loaded, a dialog box will pop up to prompt you to specify the processing area of the image file on the workpiece. According to the G20 of the G-code program to be run In /21 mode, you can choose either imperial or metric units. The dialog box is shown in Figure 8.5. If you select the Keep perspective check box, the Y-axis size will be automatically calculated when the X-axis size is given, so that the original aspect ratio of the original photo can be maintained. If the loaded image is in color, it will be converted before loading For monochrome.

The next step is to select the image copy method, that is, define the tool path when raster processing the image. Raster X/Y

It cuts along the X axis. Every time it reaches the end of the X axis, it moves an increment in the Y axis and then cuts along the X direction. The grating Y/X is just the opposite. The spiral is from the periphery of the image. Draw a circle to the middle. Each raster line is composed of

A series of straight lines, the height of the straight line in the Z axis direction depends on the gray scale of the part of the image

Write G code file

Finally, click the conversion button to load the data into Mach3Mill. A dialog box will pop up to prompt the user to input

Enter the file name of the saved G code file, you should enter the complete file name including the extension, or directly overwrite

For existing files, the file extension is usually TAP.

You can use it for processing. It is reminded that many pirated MACH3 on the market do not have the option of Load Image File in the drop-down menu after installation.

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cnc controller

Use of G code in Mach3

Q:Enter the command G54 x0 z0 in Mach3. The operation is not to zero the current positions of x and z, but to move the x and z axes to the (0, 0) position. What if I want to set the workpiece coordinate system in mach3? How to use the drilling command G73 XYZRLQ in macn3

R:The value of G54 should be preset and stored in mach. G54 means to make the current coordinate system the relative value of the preset coordinate system. You input G54 X0Z0, it is actually a two-step operation, G54, then G01 X0Z0

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cnc controller

Adjust the direction of each axis of mach3

In the setting, the origin limit is set. Find the beginning of the setting origin H and hit √ or × to change the direction back to the mechanical origin

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cnc controller

How does mach3 automatically tap

If you realize mach3 automatic tapping, you need to install the limit switch and write the VB script, then the tool can return to the mechanical origin. VB script is similar to Z-axis tool setting

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cnc controller

Calculate the a-axis pulse of the engraving machine

Mach3, USBCNC system setting: the number of pulses required for 1 degree
(Number of pulses per motor revolution × fine fraction of driver × reduction ratio) ÷ circumference
For example, two-phase motor, subdivision number 16, reduction ratio 5:1
(200×16×5) ÷360=16000÷360=44.44444444

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cnc controller

Does mach3 have RTCP function

Mach3 does not have the five-axis linkage of RTCP. In fact, it only links the bai3 axis. The mach3 system only performs three-axis interpolation. The specific rotation calculations are implemented in the post-processing of the programming software. The actual rotation is to rotate a bit to the left of the rotation axis and then perform XYZ. Three-axis interpolation. Rotate the axis coordinates a little bit and interpolate again. The result is that the G code is quite large, and the curved surface is not a continuous movement into a stepped movement.

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cnc controller

Set the coordinate value of the Z axis of the MACH3

Same as other axes, it should be calculated and set according to the transmission ratio and subdivision number. Upward is positive and downward is negative.

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cnc controller

modify the rotating coordinates of MACH3 A axis to linear coordinates

This can’t

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cnc controller

Machine zero point, machine reference point, and machine origin

Machine zero (machine origin): The design origin of the machine coordinate system (du-intrinsic coordinate system on the machine), and its position on the mechanical hardware is determined by the manufacturer. It is the origin of the machine tool coordinate system and a fixed point on the machine tool. It is not only the reference point for establishing the workpiece coordinate system on the machine tool, but also the reference point for machine tool debugging and processing.

With the different types of CNC machine tools, the machine origin is different. Usually the machine origin of the lathe is set at the intersection of the chuck end face and the spindle center line, while the machine origin of the milling machine is set in the positive direction of the three axes of the machine X, Y, and Z. Sports extreme position.

Machine reference point: The machine tool zero point is not known when the numerical control device is powered on. In order to correctly establish the machine tool coordinate system when the machine tool is working, a machine tool reference point (measurement starting point) is usually set within the movement range of each coordinate axis. , Usually go back to the reference point automatically or manually to establish the machine coordinate system and activate the parameters.
In CNC machine tools, there is also a clear understanding of the definition of the machining coordinate system and the meaning of tool setting.

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cnc controller

What is the difference between grbl and mach3

mach3 is a numerical control software developed by bai American ArtSoft company with Windows as the platform. The system version must be zhiWIN XP or WIN2000. The Mach3 software uses the LPT of the PC computer, or the USB port as the input and output of the CNC device. Pulse and direction signal, control stepper motor or servo motor driver. So as to realize the control of CNC machine tools. This software supports all international standard G codes. Up to 6 axes can be controlled. 5-axis linkage with linear interpolation function can be achieved. High precision of complex parts Processing, the highest control accuracy is 0.0001MM. When complex functions are required, MODBUS devices can be used to control the control of tool magazines, fixtures, and chip conveying mechanisms. A simple system can be achieved with one parallel port. Two complex parallel ports will do. Its The peripheral switch points can be edited with VB for sequential input and output.
And Grbl is an embedded G code compilation and motion controller for Arduino/AVR328 chip. Grbl is high performance, low cost, based on parallel port motion control, used for CNC engraving. It can run on Vanilla Arduino (Duemillanove/Uno) as long as it is equipped with an Atmega 328 chip. The controller is written and optimized by C, using every smart feature of the AVR chip to achieve precise timing and asynchronous control. It can maintain stable, unbiased control pulses over 30kHz. It accepts standard G codes and has passed the output tests of several CAM tools. The movement of arcs, circles and spirals can be perfectly supported like some other basic G code commands. Functions and variables are currently not supported, but will be included in future releases as a preprocessor. Grbl includes complete forward-looking acceleration control. It means that the controller will plan the running speed 16 to 20 movements in advance to achieve smooth acceleration and impact-free turns.

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cnc controller

Disadvantages of mach3

Almost all toy machines of mach3 are in use. I came into contact with mach3 a year ago. At that time, I bought a glass cutting machine to change the engraving machine.
Let me talk about the advantages of mach3. It supports 6-axis, has all the functions, simple operation, and the biggest advantage is cheap. Then the biggest problem of mach3 is that the algorithm is not advanced enough. The mach3 system itself is a long time old. Everyone knows that in the mach3 settings, a combination of precise stop and tasting motion must be set to achieve good results. Because of insufficient algorithms, tasting motion accuracy is not High, especially the faster the feed, the more obvious it is, and the precise stop means the jump or stop without acceleration or deceleration. This is the biggest problem. If it is a stepper motor, it will lose steps if it is directly jumped. Of course, the toy machine speed is low , The inertia is small and there is no such problem. If it is replaced with a servo, it will not lose step, but it will oscillate, just like driving a car, it is impossible to stop immediately. This is good to cause problems at sharp corners. I personally think that using closed-loop stepping is the best choice, but even if you do not lose steps, the impact on the frame is always there. If the kinetic energy of mechanical movement is not released by the motor, it is The frame bears, and it is easy to break the knife at the corner, which may have a lot to do with this. Then talk about the good machine must not use mach3, because considering the cost of toy machines, the use of mach3 is the best choice. Just because the problem caused by accurate stopping cannot be compensated by a good shelf, I have two large machines, one 1325 and one 1315, both of which are square tube rack machines, of which the 1325 frame is very Poor, (I used the second mobile phone I bought in the first half of the year). I can shake it with my hand, but after I changed the rack two days ago, I carved 46 cards. The effect is definitely not inferior to the ordinary toy machine. It can be said that it is because of the system. .
Also, it’s impossible for the engraving machine to run F6000. I think it’s also because of the system, because mach3 can’t be engraved with f6000 because mach3 is killed. If you’ve been to a furniture factory, the engraving machines used for production are all equipped with 8 and 12. There are even 24 spindles, 7*24 hours non-stop for several months, the speed is F6000 or even higher, the speed is 24000, the 4mm taper knife oak board does not open 10mm thick with one knife, I use 4mm taper knife for others, 7mm one knife, For the dry depth of 12mm, use a 6mm knife. After a year, nothing has been broken except for accidentally hitting the nail. As long as the first knife is slowed down to 20% feed, it can be directly pulled back

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cnc controller

Ethernet Mach3 Card

Ethernet Mach3 Card is a mach3 motion control card with Ethernet protocol, model NVEM.

NVEM cnc controller

It can select a fixed IP directly connected to a computer or automatically obtain an IP to connect to a router through a jumper. When using a router, the device card can automatically identify the mach3 software in the local area network and automatically connect (including the host connected via wifi)

The NVEM cnc controller support 6axis,can running on windows xp 7 10. and used for all version mach3 software.

nvem cnc controller manual Driver/Plugin(.dll download)