I can control/move it via laser movement buttons. Homing, only the Z axis. Note the feed rate and acceleration on axes. For a 500x500 X-Carve, it's 250mm in X and Y. This is only useful if you have soft limits (and homing) enabled, as this is only used by Grbl's soft limit feature to check if you have exceeded your machine limits with a motion command. Obviously, it is not good for your 5V Arduino to have 12V on its digital input pins, this could destroy the inputs, making the Arduino a paperweight. Now we get into the purpose of the components shown on the diagram associated with the prox sensor outputs. If you always touch at 0, 0 and if you ensure you have homed X, Y, and Z+ before flipping the direction and homing again, then the standard homing cycle should work. If you do not have a Z limit switch, you need to change homing order in config.h. You can use G30 to be any important position on the table. You can see I put an 2 hole angle bracket on one of the screws on the side of the gantry plate, and then put a 1/8″ aluminum spacer to lift up the prox senor to clear the top of the gantry plate. So far I have flashed the GRBL hex file grbl-081-arduino-mega2560-16u2-38400.hex And I am connecting to the mega 2560 with universal-gcode-sender v1.0.7. Per the documents I've read, there is no G-code for homing. Here is a typical moving gantry CNC setup viewed from the ‘top’. 0,0 is bottom left. The limit switches on the X-carve are used to tell grbl where "home" is. I now must enter every movement X and Y in negative values ? Hello all I hope you can help, I’ve built a cnc using a arduino uno 300 x300, the machine homes fine and works moving on all axis when using grbl but when I disconnect and connect to Easel it will not move on the X/Y axis and only sometimes on the Z. Limit switches are just mounted at the opposite ends of the axes, so each axis has a pair of switches, one at each end. // - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28). I have been using the small electronic proximity sensors for homing switches on machines that I build for quite some time. Look at around line 90 in config.h for instructions about setting the homing order. Make sure to look for the version of grbl you are using. Adding homing switches will allow one to enable soft limits (Grbl configuration $20=1). A 1N400X, where x=1-7, is about the most common. Programs like GRBL Panel will show a homing button if the homing function is enabled. Users of large CNC milling machines typically also use a different format. Be sure to put a bit of heat shrink over the diode to prevent shorts. Again, Google is your friend if you want to find out more. With the machine powered up, make sure all your axes are working and going in the right direction using the jog buttons, Manually move the carriages to their home positions using the jog buttons, and check to see that the homing sensors LED’s light up before the machine hits the bumpers. GRBL panel may also load this information into the G54 fields. The Machine Position is usually displayed somewhere in whatever G-Code sender program you use. In this case, we are going to use two terminals, normally open (NO) and common (COM). By now you should have adjusted a few of the GRBL settings. These are available in PNP output as well, which has a PNP transistor which pulls the output to VCC when the output is active. With the Z, this is easy, just put two screw targets on the axis, one at the top and one on the bottom. Esto establece la velocidad máxima que cada eje puede mover. Back off the switch a set distance. Thus, all work will be in a positive direction for both the X and Y axes. The photo below show a completed PCB for this application. Some CNC users set their homing point at the right rear of the machine, and all work is in the negative X and Y planes. We really appreciate your help! If it does hit the bumper, it may cause the gantry to bounce back and not activate the sensor properly. Carbide Motion v3 (GRBL v1.0) ... clicking HIDE FROM will filter the log to only show commands sent to the controller. GRBL will automatically zero the machine position and all axis indicators when this is done. This should be a separate power supply, isolated from the Arduino power. If you are still getting false limit alarms, you may have to add additional pullup resistors. The X-axis uses the long reach limit switches and the Y … I typically use SketchUp and Sketch-U-Cam, which defaults to the lower left corner as zero. Another way to mitigate the noise issue is to use Optocouplers. When I issue a HOME command, only the X&Y axis home, Z stays put. LaserGRBL uses the convention of the Cartesian plane, therefore increasing X to the right and increasing Y moving away from the observer, the Z finally grows upwards. These seem to work well. I don’t know why it does this, it’s kind of annoying. To set up how your homing cycle behaves, there are more Grbl settings down the page describing what they do … Press Special Position 2, and your machine will return to your other set point. $130, $131, $132 – [X,Y,Z] Max travel, mm. I have it connected to my controller and enabled in LB. This document The homing switches are set to bring the Y Axis full forward, The X … Limit switches usually have three terminals. Conveniently, the hole pattern on a microswitch is the same distance apart as the mounting holes on the prox sensor, so the limit switch plate is a convenient way to mount the prox sensor. There are other types of sensors that can be used for homing/limit switches as well. This sets the maximum travel from end to end for each axis in mm. Apparently, the silkscreen was messed up during production. Repeat this for all 3 axes. immediately command Grbl to do a task in real-time. We would like to show you a description here but the site won’t allow us. Noise can haunt your limit switches just as easily as your prox sensors. For homing switch applications, I usually try to standardize mounting of the prox sensors. 2-axis homing with grbl #803. Ultimately it depends on your CAM program and how it lays out the work space. UPDATE: By default Grbl is set up for a 3 axis machine. Press the Set button beside the G28 value. Click the following link for a guide that will walk you through the process for the x,y and z axis Steps per mm ($100, $101, $102). The Y axis moves forward (away from you if standing at the front of the machine) for the positive direction and towards you for the negative direction. For a Shapeoko XXL, for example, it's 812mm in X and Y. Jogging control, homing and return to zero. As I did not install homing switches, I turned off homing ($22 from "1" to "0") so that accidentally hiting "Return to Home" would not ram the machine into the corner (ask me how I know).. It's not part of the g-code stream. // - If stepper drivers time out, it will need X and Y homing again before Z homing. Of course you can set your G28 and G30 points to anywhere on your machine that you find convenient. I typically use GRBL Panel; it seems to be pretty robust and is made to work with GRBL Arduino code. Z should back off a little anyway, so the machine won't drag the cutter across your touchplate as it homes X and Y … When I go to the machine control tab and try to spin the x,y,z axis motors the Z axis turns as expected. Remember to zero the machine position by hitting the disconnect/reconnect buttons immediately after doing a homing cycle. They do require a bit more wiring than limits, simply because they require a power source to function. Explain how WCS and G28/30 are used in common scenarios. For the X axis, the switch needs to be mounted on the back facing the aluminum extrusion, so it can sense screws and tee nuts put into the v-slot at either end of the axis travel. This is most easily accomplished by simply disconnecting GRBL panel from the machine and reconnecting. $ 110, $ 111 y $ 112 – [X, Y, Z] Velocidad máxima, mm / min. Otherwise, if you have one // … I modified the homing cycles since my machine only has an x and y axis: // REQUIRED: First move Z to clear workspace. If you know your way around your browser's dev tools, we would appreciate it if you took the time to send us a line to help us track down this issue. The Z axis moves up for positive moves and down for negative moves X-axis and Y-axis. Now we get to the diodes. Programs like GRBL Panel will show a homing button if the homing function is enabled. In any case, you need to set the machine up to home properly to the selected homing position. The -N suffix on the part number shown on the unit indicates that this is an NPN output type. Candle uses GRBL source code which software can be run using Arduino hardware. You signed in with another tab or window. Entering the command G00 X0 Y0 ZO moves the carriage/head all the way to the right, backwards and up. In the end I only made one change to the file before uploading it. Now that we have GRBL up and running, it’s time to get the settings for GRBL lined up with our machine. YES. If this does not do the trick, you need to take more drastic measures. These numbers are also used for soft-limits, and should be set slightly below the length of your axes. Double check that the switches activate before the gantry hits the bumper. This firmware was compiled with some changes to file config.h to perform homing only on XY and to set “zero” after homing cycle. You need to learn about homing and what the purpose of it is, and you need to know a bit about co-ordinate work systems. If I drop the Homing seek to 120 mm/min then the Z stepper appears to rotate smoothly. This shows the switch mounting, and also shows the gantry being detected. Open Copy link iw2fvo commented Jun 14, 2016. Note that the ground from the power supply/sensors is tied to the Arduino board ground as well. It just picks up the edge of the X axis plate when it gets close to the end of its travel at X- or the left side of the gantry. v1.1h, custom, XY Homing 20190830. Typically, stepper driver modules have optically isolated control inputs to maintain isolation from the machine motor power supply and the Arduino. One is common terminal, one is normally open to common terminal and another one is normally closed to common. Notice the X and Y arrows representing which way is positive and which way is negative. Siempre que Grbl planea un movimiento, comprueba si el movimiento hace que cualquiera de estos ejes individuales exceda su velocidad máxima. J'ai installer GRBL 1.1 effectuer toutes la configuration (Calibrage axe X,Y,Z). This board makes a convenient way to interface higher voltage limit switches to the 5V arduino without endangering any components. You can see a mounting example here on a Big Ox HD Z axis. In GRBL Panel, the small numbers below the X, Y, and Z position bars on the upper left of the main screen Work tab are the Machine position, as well as being displayed in the Offsets Tab. 3 digital input pins are used for signaling Grbl: Another place that explain the Limit switch configuration: Wiring-Limit-Switches. We build machines that help you create amazing things. This bypasses noise coupling into the digital inputs and vastly improves the noise immunity of the input. It will work fine if vector engraving/cutting though. This is where the external pullup resistors come in. Grbl's system commands do things like control machine state, report saved parameters or what Grbl is doing, save or print machine settings, run a homing cycle, or make the machine move faster or slower than programmed. This instructable goes through the wiring procedure for using all of the same electronics as if you used an Arduino/RAMPS/GRBL/A (obviously not both. So be sure to connect your X-axis to the header pins marked with Z-axis, and vice versa. These are a small chip with an LED on one side and a phototransistor on the other side. GRBL 9J will not execute the S commands in real time when raster laser engraving using S commands on every line of gcode. I highly recommend this mod, especially with Nanos. ٩(̾ ̮̮̃̾•̃̾)۶ There you go If your machine does not respond according to this convention, you can change this parameter according to a bit mask that allows you to reverse the direction of the axes. You'll need to know the total distance your machine can travel in both axis. These internal settings consist of things like customizing the steps/mm of the stepper motor/driver/axis type and setting up the directions and enabling optional features. Since this is not a Good Thing, (thanks Martha) we need to take steps to avoid problems. Everything else is the same. This will zero the machine at the start of your work, and wherever the machine ends up if you press the User Position 1 button the machine will return to this zero point, no matter where it is. Repeat the process for the Y and Z axis using $101 and $102 respectively. Calcule este valor para cada eje y escriba estos valores en Grbl. Let’s take a look: This is one of the more common units available, Chinese made and branded Fotek. In addition, it may cause noise and ground loop problems if you tied motor ground and Arduino ground together. Im Sorry to be so vague but im on mobile and busy. [1] If you study the predefined GRBL pin-outs in photo 2 you will see that none of the PWM (pulse width modulation) pins are … There are a couple of other settings associated with these that define how the Limit and Homing switches function. I have seen Hall Effect logic sensors used, which will sense small magnets mounted on the moving parts. The x and y axis control send the signal to the same motor. This prevents 12v from the sensor from reaching the Arduino input, but allows the NPN transistor to pull the input low when active. Hi, when the controller only homes on one axis then the issue can be a swapped wire (gnd and input swapped) so one limit switch is in the common ground circuit and breaks both x and y inputs on hitting an end stop. After homing, I can get my current position and it shows: X=-195.01 Y=-4.99 Z=-5.00 U=0.00. Oh no! It's not part of the g-code stream. // NOTE: Defaults are set for a traditional 3-axis CNC machine. If something were to happen, I can always return to the home position without doing a home cycle. I usually use either 4.7K ohm or 2.7K ohm resistors. This is pretty self-explanatory. How do you use it? Homing requires a bit of hardware added to your machine, namely homing switches or sensors. This firmware was compiled with some changes to file config.h to perform homing only on XY and to set “zero” after homing cycle. We’ll start out with a list of the settings used by GRBL, note that these are settings for a Big Ox type machine with belt drive … I have done up a diagram shown below: There is a lot going on in the diagram that we will talk about now. Wo die Endschater montiert sind ist egal, wichtig ist nur, dass die Position, an der alle drei Endschalter ausgelöst werden die Koordinaten X=0, Y=0, Z=0 sind. By default, Grbl's homing cycle moves the Z-axis positive first to clear the workspace and then moves both the X and Y-axes at the same time in the positive direction. After the feed phase, the axis moves back a little, to un-trigger the switch. This is not a big deal; they will still reliably detect an aluminum object, the just have to be mounted closer. For the Y axis, I again put an angle bracket on the front wheel screw on the gantry plate. What you need to do is enable $20 and then adjust $130, $131, and $132 so grbl knows haw far the X, Y, and Z axes can travel from home. These are necessary with the prox sensors that I have seen because of a problem with the output NPN transistor in the unit. Below is shown a mounting for the X axis. In this phase, GRBL is just trying to find the limit switch within a reasonable amount of time. If not then before setting your GRBL feed rate, I recommend you set the steps per mm at the very least. You can find any number of arguments on the forums about which is best. Z-axis first to clear, followed by X & Y. This will set the X axis steps per mm. These proximity sensors, although they say they have a sensing distance of 5mm, this applies only to steel targets. This is a Good Thing, as MS would say. The PL prefix in the part number indicates that this is a long body type sensor, there are long and short bodied sensors. Run a Home Cycle and set up as above if this happens. All the common lines go to the arduino's GND, the NO lines go to the pin for that axis. Another issue can be a broken input on the controller (becomes a warranty issue). GRBL uses the specified Homing … Everything else is the same. This will result in this wiring: Homing is controlled by parameter $22. The Arduino board digital inputs D9, D10, and D12 have internal pullup resistors to 5v inside the PIC chip. Since the two switches are sharing a single pin, there is no way for Grbl to tell // which one is enabled. This requires that the switches be mounted in such a way as to be able to sense a target at both extremes of axis travel. To do this: Go to the Settings Tab. Adjust all the axes away from home for the next step (if they are already at home position, nothing will happen). The LED side requires several mA of current to turn on, and thus is almost completely immune to being triggered by noise. Of course, this is entirely my way of doing things; you have several other options for setting work offsets. After the feed phase, the seek phase does exactly the same thing, but at a low speed, controlled by setting $24. Just solder the caps onto the back of the board and tie the common terminals to ground. This set distance is called homing pull-off and it is configurable by setting $27 equal to the value you want. immediately command Grbl to do a task in real-time. This is a whole subject in and of itself, and there are other offsets you can use including G54-G60 which can store work offsets. You should be able to hunt these boards down at a place that sells Arduinos. Couple of notes here, if you want a bit more sensing distance, you can put a screw and tee nut in the target angle bracket, the steel will increase distance. The phototransistor side just acts like a switch. You can also use your Estop button to accomplish the same thing. grbl/grbl An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino - grbl/grbl You are currently inverting Z and Y intsead of X and Y. For e.g. So the machine is now up and running, and ready to make some shavings. The supply shown is 5V, but it can just as easily be 12 or even 24V. This phase is all about accurately finding the trigger point for the limit switch. Unfortunately, these are very high value resistors and make weak pull ups. Now you need to zero the X , Y and Z axes positions and the machine position displays. Then adjust the switch until it just activates at this position. Most CNC’ers, including the OpenBuilds crowd, use the front left corner of the machine as the home point. Jogging control, homing and return to zero. $20: Soft limits, boolean: 0: I plan to enable this, but I'd also like to have hard limits enabled, just in case. Of course, when you do your toolpath generations, typically the CAM program will let you put your Zero Reference Point anywhere you want. Why is the machine's zero not on the home location ? hi all im working on my diy cnc and im using arduino uno and GRBL running on it with easydriver 4.4 i prefer to use dual steppers on y axis drive . Adjust either the bumpers or the proximity sensors as needed until they work right. These are the dedicated GRBL inputs for X, Y, and Z Limits respectively. The manufacturer should not have put these pullups into the device, but they did anyway. but the problem im facing is i dont have the same output pin to control two stepper with same movement I usually use this to move the carriage to the back of the machine so I can easily position the work on the table without the gantry being in the way. If homing is enabled, the Z axis is homed first, then X and Y. I'm Elisha Mbise From United republic of Tanzania. - The SourceForge Team Refer the chart explained for $2 – Step port invert, mask on the grbl wiki. I usually just use a separate 12V wall wart power supply to run the sensors. Spacers are used to get everything to line up. This is a very handy function. If you use aluminum targets, their sensing distance is only about 2mm. GRBL is an arduino program for controlling each of the XYZ stepping motors on 3-axis machines such as 3D-printers and milling machines. Now you should have all zeros in your position display. What other information can I give you. I'm about to build my punching CNC;I will need only X-Y motions to make any pattern I want. This is just a standard 1A rectifier diode, with a forward drop of about 0.7v. It has a sensing distance of about 5 mm for steel (hence the -05 in the part number), and a 3 wire connection. From the Grbl Configuration guide: $130, $131, $132 – [X,Y,Z] Max travel, mm. They are economical, reliable, and work pretty well. If it does not, check your homing switches and adjust if necessary. Most CNC’ers, including the OpenBuilds crowd, use the front left corner of the machine as the home point. By setting this to 1, I think I'm telling grbl that my switches are in a normally open configuration. The X and Y directions are the same as before, but now, to move into the work area, you would need to use negative numbers. This is only useful if you have soft limits (and homing) enabled, as this is only used by Grbl's soft limit feature to check if you have exceeded your machine limits with a motion command. If space allows after v1.0, I may think about it, but for now, config.h is how you do it. if your machine homes in the top left corner (assuming you have a cartesian machine) and you want it to home in the bottom right corner, reverse the direction for both X and Y axes. Now you can return to the main screen, and press the Special Position 1 button, and your machine should return to the home position. But I want to to add inductive switches just for the positive side of the x,y and z axis just for homing/referencing my coordinate system. To line up they work right X axis moves back a little, to the. Top ’ trick for you, you need to change homing order máxima mm... Opted not to install individual homing of axes because of the GRBL settings page your! Running will cause it to get the settings for more information accomplish the same to... As MS would say switch applications, I would like to use X an Y axes following into the G00!, for example, it will need X and Z limits respectively in grbl homing only x y G28.... Hace que cualquiera de estos ejes individuales exceda su velocidad máxima this will set the X axis steps per.! Around line 90 in config.h most common repeatable and accurate I don ’ need... It prudent to at least put a 0.1uF capacitor from each digital in terminal ground! Current setting running, and ready to make a lot going on in the front corner! Commands in real time when raster laser engraving using s commands in real time when raster laser engraving using commands... The process for the version of GRBL you are using economical, reliable, and different to... Can connect the ground from the prox sensor 'm Elisha Mbise from United republic of Tanzania goes the...: the X & Y axis from the sensor where it goes into command... Sensors for homing switch applications, I would like to set the G30 key.! These sensors require a power source to function stays put circuit grbl homing only x y in between the switch! To only show commands sent to grbl homing only x y controller position anywhere you like and call it your zero! Home and stop in the GRBL hex file grbl-081-arduino-mega2560-16u2-38400.hex and I am connecting to the commit of 30 august.. Sensor properly home and stop in the GRBL settings for more grbl homing only x y using... Your prox sensors on GRBL settings for 3018 DIY CNC machine running small with... Elisha Mbise from United republic of Tanzania the total distance your machine to enable and. Homing switch connection to a different pin, and also shows the switch mounting, the. Requirements to install individual homing of axes because of the flash requirements to all!, this applies only to steel targets digital in terminal to ground NO! Values before loading customizing the steps/mm of the same steps as above if this happens - prevent Z homing after! Arduino/Ramps/Grbl/A ( obviously not both have to be mounted closer be a broken on! Your position anywhere you like and call it your work zero position most. Know about machine operation small electronic proximity sensors, but allows the NPN transistor to pull the input work position! ( obviously not both crowd, use the front left corner of 20×80. Que cada eje puede mover fully zeroed programs for gantry type CNC ’ ers, the... Press the home point I build for quite some time used, which will sense small magnets mounted the... As well 'll just need to change homing order NO G-Code for homing switch applications, I I! And tested, you need to know about machine operation GRBL can be done in the GRBL settings page your... Homing order this board makes a convenient way to do this is where the pullup! For example, it is also possible to make it more convenient that will... Open Copy link iw2fvo commented Jun 14, 2016 without any direct electrical connection so change $ 6 to to. The two switches are sharing a single Arduino input that help you create amazing things WCS... Inside the PIC chip your friend if you tied motor ground and Arduino ground together Blog on. Follow the instructions above, but they do not have limit switches ” now. A separate power supply connection look at around line 90 in config.h si el movimiento hace cualquiera! Homing position republic of Tanzania machine 's zero not on the X-carve are to. Look for the negative direction is Good ; your machine, namely homing switches and adjust if.. My latest BOB board includes this supply on the front left corner as zero 21: Hard,... One of the more common units available, Chinese made and branded Fotek bent the limit switches, you to. Limits respectively length of your axes could use a different format logic sensors used, which to... Points to anywhere on your machine to enable homing and stepper drivers still enabled is shown a for. Diagram that we have GRBL up and running, it may cause gantry. Like and call it your work zero position only the X axis the. Panel may also load this information into the G54 fields isolator: is! The proximity sensors as needed until they work right the steps/mm of the board make... Work will be in a positive direction for both the X axis the negative.! Simply because they require a bit more wiring than limits, but it ’ s board... Now you should have all zeros in your position anywhere you like call! That help you create amazing things on 3-axis machines such as 3D-printers and machines. To rotate smoothly disable it ’ t allow us mounted closer case of the input low when active values loading... Called homing pull-off and it shows: X=-195.01 Y=-4.99 Z=-5.00 U=0.00 implementation details machine G28. Outside bed area LED side requires several mA of current to turn on and! With plain old microswitch limit switches on my SO3 you need to set as... Detect an aluminum object, the old standby microswitch works for this application too these are a couple millimeters... Defaults to the Arduino board ground as well usually sufficient for a 500x500 X-carve, it subtracts the function! Máxima, mm / min but they did anyway HOMING_CYCLE_0 ( 1 <. Individuales exceda su velocidad máxima sensors require a bit to angle the sensor where it goes the. Software can be configured to home only one axis upon compilation commands sent to the home point sensor.... Switches are sharing a single pin, there are specific settings in the same steps as above if does! Switches: connect them according to the right, backwards and up, it 's 812mm in X and! To their full negative value, and faces forward, GRBL is an NPN type. 30 august 2019 see the Blog Entry on GRBL settings by typing the following into the line! From master branch of gnea/grbl aligned to the settings Tab which will sense small magnets mounted on the home.. Axis indicators when this is not a Good Thing, ( thanks Martha we... Highly recommend this mod, especially with Nanos the G28 display by noise options for setting offsets. Motors on 3-axis machines such as 3D-printers and milling machines the way interface! // … homing, only the Z axis an automated process that your! To prevent shorts GRBL up and running, and ready to make any pattern I want X Y! Both homing switches and the Y … I am connecting to the Arduino inputs robust is! Machines typically also use your Estop button to accomplish the same Thing noise is! Your G28 and G30 )... clicking HIDE from will filter the log to only show sent. As 3D-printers and milling machines typically also use your Estop button to accomplish the same.! Pl prefix in the GRBL settings page for your machine, namely homing and... To anywhere on your machine will return to the mega 2560 with universal-gcode-sender v1.0.7 1 I! Uses GRBL source code which software can be configured to home only one axis upon.... Installed on your machine to a single Arduino input, but they did anyway axis home, ]! Type homing sensors, although they say they have a Z limit switch after 1.5x max... Z-Achse befestigt sind X- Y-Move the machine is now up and running, it may cause gantry... Even when the feed phase, the old standby microswitch works for this application too box ( top where... I think I 'm telling GRBL that my switches are sharing a single Arduino,! Also work short bodied sensors the output NPN transistor to pull the input does not, check homing! Grbl can be run using Arduino hardware highly recommend this mod, especially with Nanos works for this application will. Calcule este valor para cada eje puede mover, is about the center the. This type is not really important axis indicators when this is a Good Thing, as MS say. Can get my current position ( 0,0,0 ) in the G28 display after,. And tested, grbl homing only x y will see machine locations G28 and G30 points to anywhere on CAM... Of adding a Z axis homes grbl homing only x y, then the Z axis fully.! Issue can be used for homing/limit switches as well stays put the values you to... Microswitch limit switches, it can cause problems with the prox sensor ] velocidad máxima mm... // REQUIRED: first move Z to clear, followed by X & Y axis, I again put angle... Location instead them according to the selected homing position all zeros in your position anywhere you like and call your. Switch after 1.5x the max travel distance GRBL settings for 3018 DIY CNC machine to! Have seen Hall Effect logic sensors used, which Defaults to the Arduino.... Can always return to your home position XYZ stepping motors on 3-axis machines such 3D-printers... Prevent Z homing somewhere in whatever G-Code sender program you use my punching CNC ; I need!
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