![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/07\/Bobs-CNC-J-Tech-Laser-273x300.jpg\")
<\/p>\n<\/p>\n
These are the instruction on how to add a J Tech Laser to your BOBs CNC machine.\u00a0 Bobs CNC machines are very simple, cost effective, and popular for new CNC enthusiasts.\u00a0 We purchased one about 6 months ago and have developed a laser kit for it.\u00a0 Here are the instructions on how to set it up.\u00a0 But first…<\/p>\n
*Disclaimer*\u00a0<\/em><\/p>\n All instructions for upgrading machines are all\u00a0done at the buyers or viewers\u00a0own risk<\/strong>. \u00a0Lasers are inherently dangerous and all safety measures are the responsibility\u00a0of the buyer or viewer. \u00a0While we provide some safety features on our laser kits, it is not a complete laser machine, so all additional features are up to you when you build your machine including interlocks, fume extraction, and fire prevention. \u00a0Any company or machine mentioned in this webpage is not associated with J Tech Photonics Inc. and they in no way endorse these instructions.<\/em><\/p>\n Ok, now that we are done with that part, lets move on.<\/p>\n *These are the BETA instructions*<\/strong><\/p>\n If there are any mistakes, please let us know at customerservice@jtechphotonics.com<\/p>\n We have made an “all in one” bundle for the Bobs CNC machine to make it easy to order.\u00a0 You can located it here:<\/p>\n Purchase the Bobs CNC Laser Upgrade<\/a><\/p>\n The laser upgrade is pretty simple and consists of the laser and the laser driver board and the mounting kit.\u00a0 In the mounting kit we have:<\/p>\n Now let’s discuss how to set it all up!<\/p>\n The mount comes with two pieces and two sets of M3 screws.<\/p>\n Place the smaller plastic piece on the back of the larger mount like in this picture:<\/p>\n Use the smaller set of M3 Screws to mount the smaller back plate to the larger front plate.\u00a0 Leave these slightly loose.\u00a0 It will look like the following:<\/p>\n Slide the mount onto the front of the gantry plate.<\/p>\n Place the larger Screws through the holes of the mount and machine.\u00a0 Do this on both sides and leave loose.<\/p>\n Tighten the smaller screws in the font making sure the mount is fully seated.\u00a0 Then, tighten the larger screws in the back.<\/p>\n If you purchased the magnetic shroud, then place the laser on the magnet mount being careful to line up the small alignment screws with the holes in the mount.<\/p>\n If you didn’t purchase the shroud, then it will look like this:<\/p>\n \u00a0<\/p>\n This is a simple process and there are only two main tasks that need to be completed<\/p>\n Grab the extension cables from the bag and get them ready by unrolling them.<\/p>\n Get the female ends of both of the cables ready.<\/p>\n Use one of the zip ties from the mounting kit to put in the back of the Z stage gantry a loop for the cables to go through.<\/p>\n Put both the laser and fan extension cable female ends in the zip tie loop and tighten them down.<\/p>\n Next you will need to move the gantry as far from the GRBL controller as possible. Leave some slack in the extension cables to where they won\u2019t be tension but will also not touch the waste board. Then use a zip tie to secure the cables on place to the machine.<\/p>\n Feed the cables through the hole where the motor cable is and pull though until a small amount of slack remains.<\/p>\n Grab the PWM and Ground cable from the bag.<\/p>\n Take the small two black ends and feed them up through the same hole the extension cables just went through. Then continue to follow the black wrapped motor cable until you reach the GRBL controller.<\/p>\n We are going to upgrade the firmware to GRBL 1.1F, so the switches have moved in this version.\u00a0 Move the Limit switch from Z+ to the D12 pin.\u00a0 It is on the top of the board.\u00a0\u00a0<\/p>\n Also, make sure you have the two jumpers in at the X location.<\/p>\n The wire we had the two black connectors on and fed to the GRBL board now needs to be connected.\u00a0 Take the Black wire header and put it on the black GND pin.\u00a0 Take the Red wire header and put it on the Z+ pin.<\/p>\n Put the driver next to the machine in a safe place.\u00a0 There are sticky pads if you want to permanently attach the laser next to the machine on a board.\u00a0 Then take the thinner PWM cable you just connected to the GRBL board and put it into Terminal H4 on the back of the laser driver.\u00a0 It should have a black dot on the connector and the cable should have a black Molex connector.<\/p>\n \u00a0Take the extension cable and put some zip ties in it to clean it up.\u00a0<\/p>\n Then connect the thick laser extension cable to the laser driver board in terminal H3.<\/p>\n Take the small JST for the Fan and connect it to the fan connector on the driver board.<\/p>\n You might need to zip tie the laser cables to clean them up.<\/p>\n Then connect them to the extension cables on the top of the gantry.<\/p>\n If you have the large KL744 machine, your controller will look a bit different.\u00a0 You will have screw terminal break out board that you will connect to.\u00a0 It is in this picture here:<\/p>\n After you upload the new firmware (next step), you will connect the following.<\/p>\n Z Limit moves from D11 to D12.<\/p>\n Laser Input Red wire + signal in D11 screw terminal<\/p>\n Laser Input Black wire – signal in GND screw terminal<\/p>\n The cable from the interface board is the small one with the black connector on one side.\u00a0 It hooks into terminal H4 on the back and screws into the D11\/GND on the other side.\u00a0 The input cable from the laser controller is circled in the picture in terminal H4.\u00a0\u00a0<\/p>\n In this section, we will upgrade your firmware on your machine to be able to engrave pictures and use the laser as part of your CNC machine. <\/p>\n\n\n\n Download GRBL 1.1F Firmware<\/strong><\/em><\/p>\n\n\n\n If you want to check and see if there is an even newer version, then go to the main GRBL page here in the release section<\/a>.<\/p>\n\n\n\n Now that you have your firmware downloaded and have extracted the .hex file, we will walk through the rest of the process.<\/p>\n\n\n\n Load Your Firmware<\/strong><\/em><\/p>\n\n\n\n For MAC: Download Hex Uploader<\/a><\/p>\n\n\n\n For PC: X loader is a cool program that makes it easy to load new firmware to your controller. You can download it here:<\/p>\n\n\n\n Download X Loader<\/a><\/p>\n\n\n\n After you download the file, extract it and run the application. You should see a dialog box like the following:<\/p>\n\n\n Browse for the GRBL \u201c.hex\u201d file. Choose \u201cUno (ATmega328) in the Device drop down. Select your COM port and put the Baud Rate at 115200. Press the \u201cUpload\u201d button. It should say \u201cuploading\u201d for no more than a minute and then it will say \u201ccompleted\u201d and the size of the file uploaded. If it runs forever, you have either the wrong device chosen, the wrong COM port, or the wrong Baud Rate.<\/p>\n\n\n\n You now have the new version of firmware on your machine.<\/p>\n\n\n\n We recommend using Lightburn software to run your laser on your BOB’s machine. You can download the trial here:<\/p>\n\n\n\n https:\/\/lightburnsoftware.com\/pages\/trial-version-try-before-you-buy<\/a><\/p>\n\n\n\n You can purchase a licence for it here:<\/p>\n\n\n\n https:\/\/jtechphotonics.com\/?product=lightburn-software<\/a><\/p>\n\n\n\n Once you download the software, install it on your computer you are using to connect to the BOB’s machine.<\/p>\n\n\n\n Ok, now that you have downloaded Lightburn software, we can get started with the rest of the setup. When you install the Lightburn software, you might see Windows trying to protect you. Click on the bottom \u201cRun Anyway\u201d button to install it. The Bob’s CNC has some things you need to change to get it all working, so we will cover it here.<\/p>\n\n\n\n When you first run Lightburn, you should have a quick setup wizard walk you through the setup. Here is what you need to do to get it set up.<\/p>\n\n\n\n If you have your COM port selected and connected in lightburn, then you might be able to use the “Find My Laser” feature in the Device Setup. We are going to show you how to use the “create manually” because it always works and you get the correct settings.<\/p>\n\n\n\n Choose GRBL from the list:<\/strong><\/p>\n\n\n\n You need to have GRBL 1.1f installed on your machine to do pictures. If you followed the instructions from the previous step where you put your firmware on then you are good. <\/p>\n\n\n\n Choose Serial\/USB<\/strong>:<\/p>\n\n\n\n Name your machine and put in the dimensions.<\/strong><\/p>\n\n\n\n The dimensions will set your grid size in lightburn. This is the dimensions for the E3. The E4 will be larger.<\/p>\n\n\n\n Choose your origin and keep \u201cAuto Home\u201d green<\/strong><\/p>\n\n\n\n Click on \u201cFinish\u201d to complete setup<\/strong><\/p>\n\n\n\n Click on the bottom right to select your machine from the drop down and click on the COM port to connect it. Make sure the USB cable is attached and the power to the machine is on (plugged in).<\/p>\n\n\n Check your GRBL Firmware Version<\/strong><\/p>\n\n\n\n Lightburn works best with the newest version 1.1f with dynamic laser mode enabled. When lightburn connects to your machine, you will see in the console your version you are on. If it does not say \u201cGrbl 1.1f\u201d then you have the wrong version.<\/p>\n\n\n Home the machine<\/strong><\/p>\n\n\n\n You need to Home your machine before you do anything else. The machine will be locked until you home it. Make sure your wires are not interfering with your switches or access to your switches by your machine.<\/p>\n\n\n\n Choose your Speed and Job Origin Settings<\/strong><\/p>\n\n\n\n We normally use inch\/min for our speed. Other people use mm\/min. I would say at least to use one of these as this is what people normally will be used to when on the forums or for help with us. ****This step is important! If you have the speed set to mm\/sec or inch\/sec then it will be 60 times too fast!****<\/strong><\/p>\n\n\n Click on the Console window to look at your setting.<\/strong><\/p>\n\n\n\n Type in \u201c$$\u201d to see your settings. You might need to scroll down on the right to see them. Check the $30, $31, and $32 values.<\/p>\n\n\n\n Change them to be:<\/p>\n\n\n\n $30 = 255 To change the value, type it in the the same place you typed in the \u201c$$\u201d command. Just type in \u201c$30 = 255\u201d and press enter to change the value.<\/p>\n\n\n\n Set up you device settings to Enable Laser Fire Button and set your S Value to 255.<\/strong><\/p>\n\n\nOverview<\/h3>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/05\/BobCNC-Highlight-2-800-300x300.jpg\")
<\/a><\/p>\n\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/05\/Bobs-Magnet-Mount-Kit-Items-JTech-Photonics-4-1024x711.jpg\")
<\/p>\nMount the Laser<\/h3>\n
Step 1:\u00a0 Assemble the mount<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-3-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-5-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-4-2.jpg\")
<\/a><\/p>\nStep 2:\u00a0 Attached the mount to the Gantry<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-6-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/07\/Bobs-CNC-Laser-Upgrade-7.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/07\/Bobs-CNC-Laser-Upgrade-8.jpg\")
<\/a><\/p>\nStep 3:\u00a0 Attach Laser<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/07\/Bobs-CNC-Laser-Upgrade-9.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/07\/Bobs-CNC-Laser-Upgrade-10.jpg\")
<\/a><\/p>\nWiring<\/h3>\n
\n
Step 4: Zip tie the end of the laser and fan extension cables<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-11-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-12-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-13-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-14-2.jpg\")
<\/a><\/p>\nStep 5:\u00a0 Run the Extension Cables to the side of the machine<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-15-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-16-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-17-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-18-2.jpg\")
<\/a><\/p>\nStep 6: Run the PWM cable to GRBL board<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-18_3.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-19-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-20-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-21-2.jpg\")
<\/a><\/p>\nStep 7:\u00a0 Move The Z Limit Switch Wire<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-22-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2023\/02\/X-Axis-jumpers.jpg\")
<\/p>\nStep 8: Connect the PWM wire we just fed into the machine.<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-23-2.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-24.jpg\")
<\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-33.jpg\")
<\/a><\/p>\nStep 9: Connect the PWM cable to the Laser Driver<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-26.jpg\")
<\/p>\nStep 10: Connect Laser Cable to Driver<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-27.jpg\")
<\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-28.jpg\")
<\/p>\nStep 11: Connect the Fan Extension to the Laser Driver<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-29.jpg\")
<\/p>\nStep 13: Connect Laser to the Extension Cables<\/h4>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-31.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/Bobs-CNC-Laser-Upgrade-32.jpg\")
<\/a><\/p>\nKL744 Electrical Hookup<\/h3>\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2023\/06\/KL744-Control-box.jpg\")
<\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2023\/06\/KL744-Control-box-J-Tech-Laser-Connections.jpg\")
<\/p>\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2023\/06\/Laser-Safety-Interface-Board-input-laser-connection.jpg\")
<\/p>\n\n\nSoftware Setup<\/h3>\n\n\n\n
Step 14: Update your GRBL firmware to 1.1f<\/h4>\n\n\n\n
\n
\n![\"2](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2017\/06\/2-X-Loader.jpg\")
<\/figure>\n<\/div>\n\n\n
Can\u2019t figure out your COM port for your machine? Here are some videos to help:
Finding COM Ports in Windows 10<\/a>
Finding COM Ports in Windows 7<\/a><\/p>\n\n\n\nStep 15: Download Lightburn<\/h4>\n\n\n\n
Configuring Lightburn<\/h3>\n\n\n\n
Step 16: Create your device in Lightburn<\/h4>\n\n\n\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-1-2-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-2.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-3.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-4.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-5.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-6.jpg\")
<\/figure>\n\n\n\nStep 17: Finish Setup<\/h4>\n\n\n\n
\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/07\/01-Connect-machine-1024x576.png\")
<\/a><\/figure>\n<\/div>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/08\/Startup-1024x576.jpg\")
<\/a><\/figure>\n<\/div>\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-18-1024x576.jpg\")
<\/figure>\n\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/08\/Lightburn-speed-setting-1024x555.jpg\")
<\/figure>\n<\/div>\n\n\n
$31 = 0
$32 = 1<\/p>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/08\/04-Settings-1024x576.jpg\")
<\/a><\/figure>\n<\/div>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/08\/06-Settings-1024x576.jpg\")
<\/a><\/figure>\n<\/div>\n\n\n
![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/08\/07-Laser-Fire-1024x576.jpg\")
<\/a><\/figure>\n<\/div>\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-18-1-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-16-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-17.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/08\/Beginner-Mode-1024x923.jpg\")
<\/figure>\n<\/div>\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-7-2-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-8-3-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-9-2-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-10-2-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-12-2-1024x576.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-17-2.jpg\")
<\/figure>\n\n\n\n![\"\"\/](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2018\/02\/High-Current-Compliant-Laser-Driver-Reset-Button.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-22-1024x576.jpg\")
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<\/figure>\n\n\n\n![\"\"](\"https:\/\/jtechphotonics.com\/wp-content\/uploads\/2019\/08\/BOBs-CNC-J-Tech-Laser-Setup-21.jpg\")
<\/figure>\n\n\n\n