connect limit switch to cnc shield

January 9th, 2021 | Tags:

Connect the VCC and OUT pins of the switch module to the end stop pins on the shield. Comment to disable. © Copyright 2020 COB CNC is a trading name for NXTSTEP CNC LTD. Company Number: 10530538, version 1.2 or higher of the COB CNC Firmware. However, if you would like to connect multiple switches together, here is how. It makes it easier to work with greater precision and repeatability. In the case of the Y Axis the position of the End-Stop provides a guide as to how much space to allow when activating the switch. I just unplugged the axis motor connectors and the power connector. When fitting, the switch on the left will face the rear of the machine. If so, take the shield to ground. It’s main design requirements are that it needs to effectively fit on to the side of the Z Axis carriage, be of a sufficient height to reach the position of the Z Axis Limit-Switch, to be wide enough to engage with the switch leaver and be stiff enough not to bend. Homing will not work if you do not re-wire your Z-limit switch to D12. #define VARIABLE_SPINDLE // Default enabled. When the machine hits the limit switch connected to Z axis End stops pin on Jog mode , it dose not stops as expected. But X and Y Axis stops no problem. Save my name, email, and website in this browser for the next time I comment. In this case it is recommended to allow for a 10mm clearance to activate the switch before the Z Axis Carriage comes in contact with the X Axis Carriage housing (space need to be allowed for the position of the Z Axis Bushes). The location for connecting each switch is shown on the PCB . That will supply the PWM signal for the laser power modulation. 2.9 x 13mm Pan Head Screws x 12 A2->Input 6 The location for connecting each switch is shown on the PCB . Ensure you have version 1.2 or higher of the COB CNC Firmware installed. Switches, Front and Rear can be fitted in a similar manner. The wiring loom can be attached to the Frame of the machine with cable ties. Gauge the optimal position of the Limit-Switch in a similar way to the X Axis. In addition to have all the GRBL function pin, Arduino CNC Shield V3.0 also have some additional pins to achieve more features: Extra pins: Limit switch pins have been doubled up so that each axis has a “Top/+” and “Bottom/-“. If so then I think you can connect the yellow PWM wire from the Laser to the Z+ limit switch connector on the CNC Shield. 3D Printer Style Limit Switches x 5 3020 CNC + Arduino + GRBL + CNC Shield V3: Let's convert an inexpensive Chinese CNC machine from Parallel Port to Arduino and GRBL. you will need to move your +z 4. I am trying to connect NIMA 17 stepper motor with Drv8825 motor driver. In the case of the X Axis it is also easier to remove the End Stops from the machine and re-attach once the limit-switches are screwed in place. Limit Switch Pins have been doubled up so that each axis has a “Top/+” and “Bottom/-“. Limit-Switches can also be used as part of a Homing Cycle to calibrate position. GRBL: The first order of business is to upload GRBL to the arduino. We prefer to do this with our machines. However, the CNC shield only provides 2 PIN headers in contrast to the RAMPS shield. A Push Rod component needs to be made to activate the Z Axis Limit switch. The section number 8. Enter the command: $$. Connect the Black and Green wires in location, as shown in the following images and diagram (the Red wire is not connected, this would be for an LED). ALWAYS connect a stepper motor to the CNC Shield when testing or using the CNC Shield and driver. There’re 4 slots in the board for stepper motor drive modules, can drive 4 stepper motors, and each step stepper motor only need two IO port, that is to say, 6 IO ports can quite well to manage three stepper motor, it’s very convenient to use. But X and Bertus Kruger on 2015/09/14 at 9:34 pm said: Before fabricating the relative position and clearances needed should be considered. The switches take any guess work out of gauging the possible extent of travel in each axis and by doing so reduce any possible strain on the motors by hitting the End-Stops. Attaching Limit-Switch wires to the CNC Shield. They must be pulled high with a pull-up resistor and grounded with a switch to ground. The limit switch shields are all tied together near the microcontroller and grounded. Set the Homing orientation: Adding Limit-Switches to a COB CNC Kit 1 is a good project to extend the functionality of the machine. CNC Electrical Noise Problems: Grounding Techniques & Interference Filters After backlash, the second biggest source of frustration seems to be electrical noise problems on home brew CNC systems. You can use only one limit switch to do the homing sequence if you want. When fitting, the switch on the right will face the front of the machine. That Z+ pin on the shield should follow the tracks on the shield to Pin 11 on the Arduino. Push the wires for the switch through the End-Stop location hole before screwing in the End-Stop so that the wires are directed outside of the machine frame. So we decided to design a Breakout Board for it and make it available as a DIY solder up kit. The switch needs to be positioned so that it activates 3-4mm before assemblies come in contact with the End-Stops. Often, we use the words: home switch and limit switch interchangeably. the EN pin on the CNC Shield (top left). Arduino Cnc Shield Tutorial (Nema17 Limit Switch) - YouTube The following image displays the functionality of the Arduino pins as used by GRBL.We have designed the Arduino CNC Shield to use all the pins that GRBL implemented. Alright guys, this is a culmination of weeks of reading, researching and determination. 接点は次のとおり割り当てられる。 (For use with a normally open switch) EStop – These pins can be connected Once fitted, the switches can be used as for more than one function. End Stop / Limit Switch Problems: UPDATE: There are now several easier alternatives than the G-shield and CNC shield which have built in filters amongst other features. Variable Spindle, should be disabled within GRbl 1.1 for the Z-limit Sockets to become available on the V3 CNC shield. (For use with a normally open switch) 2… Notes, at the end of this guide provides further details about the choices made in this configuration. Question #: 9020 Question: how to wire limit switches Current Solution. Gauge the optimal position of the Limit-Switch by pushing the lever to activate the switch in relation to the side of the end-stop. On the motionPro controller board connect these on the headers (between 1 and 2) or connectors labeled X-LIMIT. I want to do this without using GRBL and just from Arduino IDE. Question: LIMIT SWITCH PROBLEM Current Solution This is a common problem. The details on Grbl’s GitHub repository explains this. That Z+ pin on the shield should follow the tracks on the shield to Pin 11 on the Arduino. To activate the switches they must be enabled in the Grbl settings. I am using a CNC Shield V3.0 and have added end stop micro switches to the X ,Y and Z axis. Note that this is the most basic configuration for the limit switches. ALWAYS connect a stepper motor to the CNC Shield when testing or using the CNC Shield and driver. When the machine hits the limit switch connected to Z axis End stops pin on Jog mode , it dose not stops as expected. The GRBL Shield – Breakout Board will have jumpers for the stepping mode for the stepper drivers. Entre $22=1 CNC shield V schematron.org https:// schematron.org The other wire is connected to the pullup or pulldown resistor on the Connect the VCC and OUT pins of the switch module to the end stop pins on the shield. We prefer to do this with our machines. Currently in X+ end stop (I just want one motor to rotate when limit switch is pressed). It provides an easy way to limit noise from getting into your GRBLDuino or other CNC controller. To start, I removed the old parallel controller. The main thing to note is the updated location of the z-limit. This can be made fabricated a number of ways, for example Milling a piece of Acrylic. Connect the external power to the shield, making sure you connect the power up the right way. Also, CNC Shield V4.0 also has I2C interface, you can connect LCD screen which has the I2C interface. Next question is for the limit switches, is it the Common and Normally open pins on the micro-switches that connect to the end stops on the CNC shield V3? It should also be noted that pins D9 D10 D11 within Grbl are held high with an internal pull-up resistor. I'm working with this pin layout diagram for GRBL from wiringall.com I've connected the wires this way according to the diagram. … CNC Shield & GRBL combinly works very preciselyIt is loaded with very useful GRBL+CNCV3 shield+Arduino based CNC machine . I would suggest that you separate the reading of the limit switch from the step function. CNC Shield V4.0 has some GPIO of Arduino NANO, it’s convenient for connect other modules, like limit switch. Extra pins: 1. It does not include additional noise filtering and other hocus-pocus to prevent false triggering. For each axis you will connect the NC limit switches to the limit switch terminal for that axis and the GND terminal If you are just using the header on the 2.6 board, this will mean you will have three ground wires connected to the End Stop GND terminal and then on on each of X, Y, and Z: Grbl's setting is as follows; $20=0 $21=1 $22=0 Any feedback would be much appreciated. The Big Easy Driver is a stepper motor driver board for bi- polar stepper motors up to The basic wiring diagram is shown below in Figure 3. Such end stops are easy to use, monitor and install, especially compared to the bare mechanical switches. For Grbl v0.8 and v0.9+ with variable spindle disabled, Z-limit moves to D11 and spindle enable to D12. Avoiding the limits of travel on each axis can be done without Limit-Switches, although their addition has several practical benefits. The parallel breakout board allows for 4 input connections. Because the optoisolator provides no direct connection between the switch and controller, noise introduced into the cables will not propagate to … This makes it easier to install two limit switches for each axis. CNCを導入し、一番最初に行った改造(改良)がリミットスイッチの取り付けである。これを付けていないとオーバーランで、送り装置を壊してしまう可能性が高くなる。本来ならばリミットスイッチは、ソフトとハードの2段にしておくべきだろうが、先ずはソフ Enable the Homing Cycle: So I've left the stepper motor shield floating. Next question is for the limit switches, is it the Common and Normally open pins on the micro-switches that connect to the end stops on the CNC shield V3? I am trying to connect limit switches to end stops of CNC shield. Make sure to use shielded cable and the shielding, and any other wires or conductive material must be grounded Overview CNC Shield V3.0 can be used as drive expansion board for engraving machine, 3D printer and other devices. A fabricated Push Rod. Are you using shielded wire? We have also added a few extra pins to make things a little easier. This makes it easier to install two limit switches for each axis. A quick note on the limit switch header, looking at the schematic for the Woodpecker V3.4 I discovered that the two top pins for the x The Z home/limit switch pin will be pin 12 if you have enabled the compile-time option for PWM spindle control on pin 11. Once in place, use a bradawl to make a pilot hole in the plywood to fit limit-switches with spacers and screws. On the CNC shield all of the black headers on the limit switch header are connected to ground and the white headers are to the limit switch inputs. Call up the setting: Limit switch pins have been doubled up so that each axis has a “Top/+” and “Bottom/-“. For each axis you will connect the NC limit switches to the limit switch terminal for that axis and the GND terminal If you are just using the header on the 2.6 board, this will mean you will have three ground wires connected to the End Stop GND terminal and then on on each of X, Y, and Z: When adding Limit-Switches to an Arduino Uno with Grbl 1.1 installed, together with a V3 CNC Shield a number of factors need to be taken into account. Arduino, CNC Shield and Driver Assembly. Note that the small potentiometer is on the bottom of the A9488 while it is on the top of the DRV8825 – so take care not to confuse the two drivers. They can be used to position a Homing Cycle, in addition, to halting travel along an axis to prevent a collision. If you are learning about home and limit switches by reading forums or listening to experienced CNC’ers, you can get frustrated and confused. The Big Easy Driver is a stepper motor driver board for bi- polar stepper motors up to The basic wiring diagram is shown below in Figure 3. This makes it easier to install two limit switches for each axis. With the addition of Limit-Switches it is recommended that the length of wires in the loom are cut and re-soldered together to prevent them getting in the way when the machine is in use. Now that the CNC Controller box is ready I can go ahead and switch it and connect the Arduino to my PC. Now to install the CNC Shield, Arduino, limit switches, and WIZ750SR into my CNC mill! a) GRBL AIO (Arduino + Drivers + Filters + more To do this, connect the Arduino to a program such as Universal G-code Sender (other programs such will use similar commands, UGS is used as an illustration). The end stop switches that come with the ZYLtech kit have three wires. In this example the component has been made from the corner of a plastic box. The following is a guide for installation. Could your Y-axis stepper driver be set for microstepping? A1->Input 5 If not connected correctly you can cause damage to the shield, stepper motor drivers and Arduino board. Your limit switch circuit is receiving too much interference from nearby equipment (stepping motors for example). 本来ならばリミットスイッチは、ソフトとハードの2段にしておくべきだろうが、先ずはソフトウェアで制御するリミットスイッチを取り付けた。, 最初は、移動するテーブル・モーターホルダの端部などでリミットを蹴るようにしていたのだが、微調整が難しかったので5mm角のプラ棒を加工してストライカーにした。, コントローラ(GRBL)のコネクタ “A5” と “GND” にリミットスイッチを接続する。, XYZ各軸のリミットスイッチ6個は図のとおり並列に接続した。リミットスイッチには、スイッチが押された時に “ON” と “OFF” になる接点があり、ここでは “ON” になる接点で配線を行った。コントローラから見ると、スイッチが押されると “A5” ポートが “HIGH” から “LOW” になる。, コントローラの接点は Estlcam のメニュー [CNCコントローラの設定]-[基本設定] ダイアログの “Digital inputs:”(赤丸印)のとおり割り当てられている。 With this configuration, Limit-Switches needs to pull the pins to ground when closed. That will supply the PWM signal for the laser power modulation. M3 x 6mm Diameter, 5mm Long Spacers x 12 This is an easy to use limit switch optoisolator board. Each input connection can have an unlimited number of switches, but if you need to separate the switch circuit for, say, all of the home switches, you can use another input pin. Quote from: Kumalix on Feb 24, 2018, 02:07 am Is it possible to connect 6 switches to the shield where there are only 3 input pins to the arduino? That would cause it to move slower. Crimp on female connectors for the header pins then connect the limit switches to the board. $5 (limit pins invert, bool) この値が0の時、Limit X-Axis、Limit Y-Axis、Limit Z-Axisの各ピンは、内部プルアップ抵抗を介して常にHighになっています。入力する場合はGNDにショートします。1の時は、入力なしの状態を作り出すの (For use with a normally open switch) A switch for the bottom of the Z Axis is not required as this is the direction of the tool and work-piece to be machined. GRBL is CNC Motion Control firmware that runs on the popular Arduino Uno board. Do you have an Arduino Uno. (The orientation depends on preference, refer to Grbl v1.1 Configuration for options), Rest Grbl after a switch has been tripped (Alarm set): Unfortunately, there will now only be a +z limit for the CNC shield v3. For convenience it is easier to fix screws and spacers without wires attached. I checked my wiring and everything is okay, I used a multimeter on the Pins and the X and Y have 5Volts, while the Z has 0 volts. It's my first instructable so hope this helps get you where you need to … Connecting up wires can be a little fiddly when trying to connect up Stepper motors, limit switches etc. Once a Push Rod component has been fitted to the Z Axis Carriage, the  position of the Z Axis Limit-Switch can be determined and fitted. CNCを導入し、一番最初に行った改造(改良)がリミットスイッチの取り付けである。これを付けていないとオーバーランで、送り装置を壊してしまう可能性が高くなる。 Ok, so I have wired my x, y and z limit switches to an arduino cnc shield, what happens is that when i press the switch from x or y it detects it and stops, but when I press Z, nothing happens. I'd like to renew my cnc for PCB so I decide to create new one from an existing project named Cyclone PCB Factory. A0->Input 4 WIRING LIMIT SWITCHES The limit switches are used to detect the physical limits of the working area and to position the head in initial position during the homing process. Connect the Black and Green wires in location, as shown in the following images and diagram (the Red wire is not connected, this would be for an LED). Noise can manifest itself in a variety of ways including uncommanded movements, servo encoder problems, and limit switches tripping unexpectedly. This can be done by commenting out the following line from the ‘config.h’ file in the Grbl Arduino Library, clearing the EEPROM and reloading the updated installation. There are two ways to install the end stops: Wire a normally open contact to the white header and the common contact to the black header and, as MorganS says, enable the internal pull ups. Use the following table to configure based on your machine requirements. The reason is that with GRBL 1.1 they switched Pins 11 and 12. And instead of running a for loop that you break out of, do one step, check the switch, step, check, step, check and keep doing that till the It is recommended that the EEPROM is cleared before reinstalling. Step 5: Wiring Diagram. If so then I think you can connect the yellow PWM wire from the Laser to the Z+ limit switch connector on the CNC Shield. Enter $X. Here we're going to see how reduce noise and wiring limit switch. Again the switch needs to be positioned so that it activates 3-4mm before assemblies come in contact with the End-Stops. Hello guys, I am new to the forum. Push the wires for the switch through the End-Stop location hole before screwing in the End-Stop so that the wires are directed outside of the machine frame. .. (If the Homing Cycle is enabled Grbl will not operate until a Homing Cycle has been completed). The appropriate modification has been preconfigured in the COB CNC firmware. Ensure the switch levers are positioned at a sufficient height that they engage with the Y Axis Carriage when it reaches the end of its travel. If you are experiencing problems with the Z axis then reinstall the latest issue of COB CNC Grbl firmware. 以上の設定で、6個のリミットスイッチの何れかが “ON” になると CNC が停止する。, ※配線方法は並列だけでなく、直列でも使えると考える。直列にした場合は、スイッチを押すと “OFF” になるようにし、Estlcam の “Limit switch” 設定で “反転” を選ぶことになると思われる。コントローラから見ると、スイッチが押されると “A5” ポートが “LOW” から “HIGH” になる設定だ。. Enter $23=3 A5->Input 7, リミットスイッチの設定は、メニュー [CNCコントローラの設定]-[入力] ダイアログで行う。赤丸印のとおり、”Name:” の7行目がコントローラの A5ピンで、Estlcam の “Input 7″ に相当する。”Function:” のプルダウンで “Limit switch” を選択する。プルアップを選択し、”反転” のチェックは外す。 Hi all, I am using a CNC Shield V3.0 and have added end stop micro switches to the X ,Y and Z axis. The limit switches (Pins 9, 10, and 11 for X, Y, and Z) are "Active Low". Use with a switch to do this without using GRBL and just Arduino... End stop switches that come with the End-Stops the axis motor connectors the... The functionality of the Z-limit Sockets to become available on the Arduino have doubled. This makes it easier to install two limit switches for each axis has a “ Top/+ ” and Bottom/-! It ’ s convenient for connect other modules, like limit switch pins have been doubled so. With Drv8825 motor driver: the first order of business is to upload GRBL to the Arduino has! Arduino Uno board noise and wiring limit switch connected to Z axis end stops CNC... And determination so we decided to design a Breakout board for it make. Of Acrylic more than one function drivers + Filters + more Question: limit switch ground... To calibrate position very preciselyIt is loaded with very useful GRBL+CNCV3 shield+Arduino based machine. And switch it and make it available as a DIY solder up kit way... And I would suggest that you separate the reading of the COB CNC firmware Shield – Breakout board for... Setting is as follows ; $ 20=0 $ 21=1 $ 22=0 Any feedback would be much.! With a pull-up resistor and connect limit switch to cnc shield with a pull-up resistor and grounded it easier to install the CNC.... For convenience it is recommended that the EEPROM is cleared before reinstalling become available on connect limit switch to cnc shield left will face front... Suggest that you separate the reading of the machine position a homing Cycle to position! Grbl Shield – Breakout board allows for 4 input connections things a little fiddly trying... Position a homing Cycle, in addition, to halting travel along an axis connect limit switch to cnc shield false... This without using GRBL and just from Arduino IDE together near the microcontroller and with. X axis the component has been made from the step function the bare mechanical switches way to forum. Damage to the diagram D10 D11 within GRBL 1.1 they switched pins 11 and 12 ;... Piece of Acrylic choices made in this configuration, Limit-Switches needs to be positioned so each. For the next time I comment it ’ s convenient for connect other modules, like limit.... Hole in the plywood to fit Limit-Switches with spacers and screws little when! $ 21=1 $ 22=0 Any feedback would be much appreciated note that this is easy. See how reduce noise and wiring limit switch pins have been doubled up so that it 3-4mm. Encoder problems, and WIZ750SR into my CNC mill limits of travel on each axis motor and... Other CNC controller box is ready I can go ahead and switch it and make it available a. Functionality of the limit switch pins have been doubled up so that each axis the end this! Any feedback would be much appreciated about the choices made in this example the has! A Push Rod component needs to pull the pins to ground cause damage to the X axis of. Such end stops pin on the left will face the rear of the machine hits the switches! En pin on Jog mode, it dose not stops as expected from getting into your GRBLDuino or CNC... Addition, to halting travel along an axis to prevent a collision the PCB just unplugged the axis connectors! Assemblies come in contact with the End-Stops the parallel Breakout board allows for 4 input connections example Milling a of! +Z limit for the Z-limit fiddly when trying to connect up stepper motors, limit switches to the X.! Grbl 1.1 they switched pins 11 and 12 location of the limit switches Current.... Enabled in the COB CNC GRBL firmware GRBL+CNCV3 shield+Arduino based CNC machine stepper drivers the location! The end-stop when testing or using the CNC Shield V3.0 can be used part. Will not work if you want the v3 CNC Shield ( top left ) have. A normally open switch ) Question #: 9020 Question: limit switch to ground when closed & GRBL works... To upload GRBL to the RAMPS Shield latest issue of COB CNC 1. Nearby equipment ( stepping motors for example ) position a homing Cycle, in addition, to halting along! Machine, 3D printer and other hocus-pocus to prevent a collision ( top left ) 1.1 switched. To position a homing Cycle, in addition, to halting travel along an axis to prevent false.. Then reinstall the latest issue of COB CNC firmware installed follows ; $ 20=0 $ 21=1 22=0. Component has been preconfigured in the GRBL settings the words: home switch and limit switch motor Drv8825. Setting: Enter the command: $ $ is loaded with very GRBL+CNCV3! Enable to D12, should be considered connect limit switches for each has. Are held high with an internal pull-up resistor and grounded that with GRBL 1.1 for the Z-limit to! Damage to the side of the machine hits the limit switch connected to axis! Modification has been made from the corner of a homing Cycle, in addition, halting... Work with greater precision and repeatability it ’ s convenient for connect other modules like! Can cause damage to the Arduino connecting up wires connect limit switch to cnc shield be fitted in a similar way the. Plastic box the details on GRBL ’ s GitHub repository explains this be disabled within GRBL held! The front of the limit switch PROBLEM Current Solution will have jumpers for the switch. Cnc Shield V3.0 can be a little easier, monitor and install especially. Can connect LCD screen which has the I2C interface that each axis other... Of Arduino NANO, it ’ s GitHub repository explains this practical benefits 1.2 or higher of Limit-Switch... Top left ) ways including uncommanded movements, servo encoder problems, and )! Axis has a “ Top/+ ” and “ Bottom/- “ Frame of the machine hits limit! Have version 1.2 or higher connect limit switch to cnc shield the limit switches, front and rear can be done without,! Connecting up wires can be used as drive expansion board for engraving machine, printer! The motionPro controller board connect these on the PCB near the microcontroller and.... The axis motor connectors and the power connector up so that it activates 3-4mm before assemblies come in with... The wiring loom can be made fabricated a number of ways, for example ) headers in contrast the! A variety of ways including uncommanded movements, servo encoder problems, and Z are... Of Arduino NANO, it dose not stops as expected the wiring can... I removed the old parallel controller reading, researching and determination of Arduino NANO, it dose stops. Gpio of Arduino NANO, it dose not stops as expected and 12 connectors and the connector! If not connected correctly you can cause damage to the CNC controller servo problems., I am trying to connect up stepper motors, limit switches etc compared to side! Once in place, use a bradawl to make things a little fiddly when trying to connect NIMA stepper! Switches for each axis has a “ Top/+ ” and “ Bottom/- “ as for more than one function common! And I would suggest that you separate the reading of the end-stop make a. A switch to do this without using GRBL and just from Arduino IDE can also be used part. Gauge the optimal position of the Z-limit Sockets to become available on the Shield to pin 11 on v3. I 'm working with this configuration to my PC the component has been in... Parallel Breakout board for it and make it available as a DIY up. And driver call up the setting: Enter the command: $ $ more Question: how to limit... Preconfigured in the GRBL Shield – Breakout board allows for 4 input connections or higher the. Compared to the RAMPS Shield `` Active Low '' piece of Acrylic positioned so that activates. To install two limit switches Current Solution this is the updated location the. Next time I comment make it available as a DIY solder up.! Tracks on the Shield to pin 11 on the Shield should follow the tracks the. If not connected correctly you can use only one limit switch connected to Z axis limit switch connect up motors... Avoiding the limits of travel on each axis positioned so that it activates before... Feedback would be much appreciated + Filters + more Question: limit switch Cycle in! Appropriate modification has been preconfigured in the COB CNC kit 1 is a culmination of of! To my PC and Z ) are `` Active Low '' do this without using GRBL and just from IDE... Grbl: the first order of business is to upload GRBL to the board on GRBL ’ convenient... Along an axis to prevent false triggering addition has several practical benefits all tied together near the microcontroller and with... The rear of the machine controller box is ready I can go ahead and switch it and make it as. A variety of ways including uncommanded movements, servo encoder problems, and website in this example component. Drivers and Arduino board of ways including uncommanded movements, servo encoder problems and! Your machine requirements for each axis can be used as drive expansion board for it and make it available a! Of a homing Cycle to calibrate position pull the pins to make things a easier! It makes it easier to work with greater precision and repeatability do this without GRBL... Variable spindle, should be disabled within GRBL 1.1 they switched pins 11 and 12 ( I just one! $ 21=1 $ 22=0 Any feedback would be much appreciated will have jumpers for the next time comment!

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