
Sending a G-code file to Candle, a popular GRBL controller software, is a straightforward process that allows you to execute CNC machining operations. First, ensure Candle is installed and connected to your CNC machine via a USB or serial port. Once connected, open Candle and navigate to the File menu, where you can select Open G-Code File to browse and select your G-code file. After loading the file, verify the preview to ensure the toolpaths are correct. Finally, click the Start or Run button to begin the machining process, ensuring your machine is properly set up and ready to execute the commands. This method provides a seamless way to transfer and execute G-code files for precise CNC operations.
| Characteristics | Values |
|---|---|
| File Format | G-Code (.gcode or .nc) |
| Supported Software | Candle (GRBL controller software) |
| Connection Methods | USB, Serial Port |
| Required Hardware | Computer, CNC Machine with GRBL controller, USB cable |
| Steps to Send G-Code | 1. Open Candle software 2. Connect CNC machine via USB 3. Load G-Code file 4. Homing (if required) 5. Start the job |
| File Size Limit | Depends on GRBL controller memory (typically up to 256 KB) |
| Compatibility | Works with GRBL-based CNC machines |
| Additional Features | Real-time control, jogging, manual control, and job progress tracking |
| Error Handling | Provides error messages for incorrect G-Code or connection issues |
| Updates | Regular updates for Candle software to improve functionality |
| Community Support | Active forums and communities for troubleshooting and tips |
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What You'll Learn
- Prepare G-Code File: Ensure file is saved in .gcode or .nc format, compatible with Candle
- Connect Machine: Link your CNC machine to the computer via USB or parallel port
- Open Candle: Launch Candle software and select the correct port for your machine
- Load G-Code: Use Candle’s interface to upload the G-Code file for processing
- Start Job: Verify settings, then begin the CNC operation via Candle’s controls

Prepare G-Code File: Ensure file is saved in .gcode or .nc format, compatible with Candle
Preparing a G-code file for use with Candle requires careful attention to file formatting and compatibility. The first step is to ensure your G-code file is saved in either the `.gcode` or `.nc` format, as these are the primary file types supported by Candle. Most CAM (Computer-Aided Manufacturing) software, such as Fusion 360, Vectric VCarve, or LinuxCNC, allows you to export your toolpaths in one of these formats. When saving the file, double-check the file extension to confirm it is `.gcode` or `.nc`, as incorrect extensions can prevent Candle from recognizing the file.
Once the file is saved in the correct format, verify that the G-code itself is compatible with Candle and your CNC machine. Candle supports standard G-code commands, but it’s essential to avoid using machine-specific or proprietary codes that may not be interpreted correctly. Review the G-code file for any non-standard commands or syntax errors, as these can cause issues during execution. If you’re unsure about the compatibility, consult the documentation for your CAM software or test the file with a G-code simulator before sending it to Candle.
Organize your G-code file in a dedicated folder to keep your workspace tidy and ensure easy access when needed. Save the file with a clear and descriptive name that reflects the project or part it corresponds to. This practice not only helps you locate the file quickly but also prevents confusion if you’re working on multiple projects simultaneously. Avoid using special characters or spaces in the file name, as these can sometimes cause compatibility issues with certain systems.
Before sending the G-code file to Candle, double-check that the file path is accessible from the computer running Candle. If the file is saved on an external drive or network location, ensure the drive is connected or the network path is mapped correctly. Candle needs to be able to locate the file seamlessly, so storing it in a local directory or a consistently accessible location is recommended. This step eliminates potential errors when loading the file into Candle.
Finally, open Candle and navigate to the "File" menu to load the G-code file. Use the "Open G-Code File" option and browse to the location where you saved the `.gcode` or `.nc` file. Once loaded, Candle will display the toolpaths and allow you to simulate the job before running it on your CNC machine. By following these steps to prepare and save your G-code file correctly, you ensure a smooth and error-free process when sending it to Candle for execution.
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Connect Machine: Link your CNC machine to the computer via USB or parallel port
To connect your CNC machine to your computer via USB or parallel port, you'll need to ensure both hardware and software compatibility. Start by identifying the type of port your CNC machine uses. Most modern CNC machines come with a USB port, while older models might rely on a parallel port. Once you’ve confirmed the port type, locate the corresponding port on your computer. If your computer lacks a parallel port, you may need a parallel-to-USB adapter to establish the connection. Ensure the adapter is compatible with your CNC machine’s requirements.
Next, physically connect the CNC machine to the computer using the appropriate cable. For USB connections, use a standard USB cable, and for parallel ports, use a DB25 cable. Securely insert the cable into both the CNC machine and the computer to avoid any loose connections. If using an adapter, connect it first to the computer’s USB port and then attach the parallel cable to the adapter and the CNC machine. Double-check that all connections are firm and properly aligned.
After establishing the physical connection, power on both the CNC machine and the computer. Allow the operating system to detect the new hardware. If the CNC machine requires specific drivers, install them now. You can usually find these drivers on the manufacturer’s website or included in the machine’s documentation. Follow the installation instructions carefully to ensure the drivers are correctly set up.
Once the drivers are installed, open Candle or your preferred CNC control software. Navigate to the settings or machine configuration menu to verify that the software recognizes the connected CNC machine. Select the appropriate communication port (USB or parallel port) from the dropdown menu. If the software doesn’t detect the machine, troubleshoot by checking the cable connections, restarting both devices, or reinstalling the drivers.
Finally, test the connection by sending a simple G-code command to the CNC machine. Load a basic G-code file into Candle and initiate the program. Observe the machine’s response to ensure it moves as expected. If the machine operates correctly, the connection is successful, and you’re ready to send more complex G-code files for your projects. Always monitor the first few movements to confirm everything is functioning as intended.
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Open Candle: Launch Candle software and select the correct port for your machine
To begin the process of sending a G-code file to Candle, you must first open the Candle software on your computer. Candle is a popular GRBL controller used for controlling CNC machines, and it serves as the interface between your G-code file and your machine. After installing Candle, locate the application on your computer and launch it by double-clicking the icon. Once the software opens, you’ll be greeted with the main interface, which includes various controls and settings for operating your CNC machine. Ensure that Candle is updated to the latest version to avoid compatibility issues and take advantage of the newest features.
With Candle open, the next critical step is to select the correct port for your machine. The port is the communication channel between your computer and the CNC controller. To do this, navigate to the top left corner of the Candle interface and click on the dropdown menu labeled "Serial Port." Here, you’ll see a list of available ports on your computer. Identify the correct port by checking your machine’s documentation or by noting which port your USB cable is connected to (e.g., COM3, COM4, etc.). If you’re unsure, disconnect the USB cable and observe which port disappears from the list, then reconnect it to confirm. Selecting the wrong port will prevent communication with your machine, so double-check your choice.
After selecting the correct port, you’ll need to configure the baud rate, which determines the speed of data transfer between your computer and the CNC controller. For GRBL-based machines, the default baud rate is typically 115200. Ensure this value is set correctly in the Candle interface, as an incorrect baud rate will result in failed communication. The baud rate setting is usually located next to the port selection dropdown. Once the port and baud rate are correctly configured, click the "Connect" button to establish a connection with your machine.
Upon successful connection, Candle will display the machine’s status, such as its current position and active settings. If the connection fails, verify that your machine is powered on, the USB cable is securely connected, and the port and baud rate are correctly configured. Occasionally, restarting both Candle and your machine can resolve connection issues. Once connected, you’re ready to proceed with loading and executing your G-code file, ensuring a seamless transition from setup to operation.
Finally, it’s important to test the connection before sending any G-code files. Use Candle’s manual controls to jog the machine axes and ensure they move as expected. This step confirms that communication is functioning properly and helps identify any potential issues before starting a job. Testing the connection also familiarizes you with Candle’s interface, making future operations smoother and more efficient. With the correct port selected and communication established, you’re now fully prepared to send your G-code file to Candle and begin machining.
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Load G-Code: Use Candle’s interface to upload the G-Code file for processing
To load a G-Code file into Candle, the first step is to ensure that Candle is properly installed and running on your computer. Once Candle is open, locate the main interface where you’ll find the necessary tools for uploading and processing G-Code files. The interface is designed to be user-friendly, with clearly labeled buttons and menus to guide you through the process. Before proceeding, make sure your G-Code file is saved in a location that is easily accessible, such as your desktop or a dedicated folder for CNC projects.
Next, navigate to the "File" menu in the top-left corner of the Candle interface. Click on "File" and then select "Open G-Code" from the dropdown menu. This action will open a file explorer window, allowing you to browse your computer’s directories to locate the G-Code file you wish to upload. Once you’ve found the file, click on it to select it, and then click the "Open" button to confirm your selection. Candle will then load the G-Code file into its workspace, preparing it for processing.
After the G-Code file is loaded, Candle will display the code in its editor window. Take a moment to review the code to ensure it matches your intended design and that there are no obvious errors. Candle provides basic syntax highlighting, which can help you quickly identify any issues or inconsistencies in the G-Code. If everything looks correct, you can proceed to the next steps, such as setting up the machine parameters or simulating the toolpath to verify the design before actual machining.
Another method to load a G-Code file into Candle is by using the drag-and-drop feature. Simply locate the G-Code file in your file explorer, click on it, and drag it directly into the Candle interface. Candle will automatically detect the file and load it into the editor. This method can save time and is particularly useful if you frequently switch between files or work with multiple G-Code programs. Regardless of the method you choose, Candle ensures a seamless and efficient process for uploading and preparing your G-Code files for CNC operations.
Lastly, if you encounter any issues while loading the G-Code file, such as file format errors or compatibility problems, refer to Candle’s documentation or community forums for troubleshooting tips. Common issues often stem from incorrect file encoding or unsupported G-Code commands, which can usually be resolved by adjusting the file or updating Candle to the latest version. By following these steps and leveraging Candle’s intuitive interface, you can confidently load and process G-Code files for your CNC projects.
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Start Job: Verify settings, then begin the CNC operation via Candle’s controls
Before initiating the CNC operation using Candle, it's crucial to ensure that all settings are correctly configured to avoid errors or damage to your machine. Start by opening Candle and connecting it to your CNC controller. Verify that the communication port and baud rate match those set on your CNC controller. Once connected, load your G-code file into Candle by clicking on the "Open File" button and navigating to the location of your G-code file. Double-check that the file is correctly loaded and displayed in the Candle interface.
With the G-code file loaded, proceed to the machine settings tab in Candle. Here, confirm that the machine dimensions, tool offsets, and other critical parameters are accurately set. Ensure that the units (metric or imperial) match those used in your G-code file to prevent scaling issues. Additionally, verify the spindle speed, feed rates, and other operation-specific settings to align with your project requirements. If you're using a probe for tool length or work offset, ensure that the probing settings are correctly configured.
Next, move to the jog controls in Candle to manually position your CNC machine. Use the jog buttons to move the spindle to the starting point of your job, ensuring it is correctly aligned with the workpiece. Double-check the machine's position by referencing the work coordinates displayed in Candle. If your machine has a tool changer, confirm that the correct tool is loaded and that the tool length offset is applied. This step is vital to ensure the tool paths in your G-code file execute as intended.
Once all settings are verified, navigate to the control panel in Candle where the G-code commands are displayed. Review the first few lines of the G-code to ensure they align with your machine's current state. When everything is confirmed, click the "Start" or "Run" button in Candle to begin the CNC operation. Monitor the machine closely during the initial stages of the job to ensure it is operating as expected. Candle will execute the G-code line by line, sending commands to the CNC controller in real-time.
During the operation, utilize Candle's visualization tools to track the toolpath and machine movements. If any issues arise, such as unexpected movements or errors, immediately pause the job using Candle's controls. Address the problem, make necessary adjustments, and resume the operation once everything is corrected. Always prioritize safety and precision when running CNC jobs via Candle, as proper verification and monitoring are key to successful machining.
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Frequently asked questions
The easiest way is to use the "File" menu in Candle, select "Open," and then browse to your G-code file to load it directly into the software.
Yes, you can drag and drop your G-code file directly into the Candle interface, and it will automatically load the file for you.
Ensure your machine is connected to your computer via USB, open Candle, select the correct port under "Machine" settings, and then load your G-code file using the "Open" option in the "File" menu.
Yes, if your machine supports network connectivity, you can configure Candle to connect via the network, load your G-code file, and send it to the machine using the "Send" or "Run" button.





















