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Question #: 14489

Question: limit switch does not work as wired mach3 usb

Current Solution

Are you connecting the limit switch in normally open mode? I would suggest connecting a single limit switch from the DCM terminal to one of the input terminals. Make sure you have a 24v power supply connected between the 24V terminal and the DCM terminal.

Additional Information:
Are you connecting the limit switch in normally open mode? I would suggest connecting a single limit switch from the DCM terminal to one of the input terminals. Make sure you have a 24v power supply connected between the 24V terminal and the DCM terminal.

Additional Information:

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Other Possible Solutions to this Question

  • WILL THE USB BREAKOUT BOARD WORK WITH MACH3?

    Sure, the USB interface has a place for 4 axes of limit switches.

    Each axis can have two limit switches: one for the ++ (positive) end and one for the -- (negative) end. The positive end would be the limit switch at the end of the machine that, say the machine has a 4'x8' area, reaches a bit after the 8 foot mark. The negative end would be the limit switch behind the 0 foot location behind the origin. If the origin is in the middle, the negative would be at a little more than the -4 foot end and the positive would be at a bit more than the +4 foot end. Note that you can have more than one switch on each pin where the NC is connected in serial fashion and the NO is connected in parallel fashion (this can be seen on the diagram in the multiple limits switch section). The software configurations for the limits switches are under File -> Settings -> Limit.

    A typical limit switch has three connections on it. These connections consist of COM (common), NC (normally closed) and NO (normally open). The COM would generally go to GND and the NC or the NO would go to the pin. If the NC is used, then the the switch is constantly connected until the switch is pushed (engaged) then the connection from the pin to gnd is broken (open). Use the settings in software to set whether in NC or NO configuration.

    Let me know if this information was helpful (or not) by adding information to this question. Thanks.

    User response:
    Thank you very much for this helpful information. I'm still a little fuzzy on how the 6 limit switches physically connect to each other and to the USB breakout board. You've stated one switch (home) goes to positive and another switch (limit) goes to negative. Are all the GND prongs from all 6 switches connected to each other and going to GND on the breakout board, or no? And the NC prongs, how exactly are they connected to each other? And to the board? There has to be a diagram somewhere shows this visually, no? I don't know how to wire the switches in series or in parallel. I have already physically installed all the switches on the machine and ran the wires to where the board is. Now I just need to know where to plug these wires into the board. Also, taking into consideration that I'm using the Planet CNC software, the only settings I have pertaining to limit switches is "Enable/Disable" for each axis, and the actual limit for each axis. Nothing about NC or NO. Is that only in Mach3?
    Thank you.

    buildyourcnc response:
    On the USB interface, the COM on the switch connects to GND and the NC or NO connects to the input pin (i.e. x++, y--, etc.)

    Limit switch configuration is rather difficult to understand, especially with series and parallel. You can think of series as a single wire going from GND to the axis letter input terminal (i.e. X++ or X--). If the wire is broken, then the circuit is open (or the switch is engaged in a normally closed scenario). Normally closed is like an actual wire, and when engaged, the switch "opens" (breaks the wire). This is why we recommend in some systems that you can put many switches in series on a single pin. When one of the switches is engaged (breaking the connection) then the entire circuit of switches is broken and the machine stops.

    In a parallel scenario, the state of the circuit is always broken until the one of the switches is engaged and the circuit is then closed or connected. The topology looks like a ladder. All the switches connect to both sides of the ladder and the switches are like the runs of the ladder (the horizontal bars that the feet are placed while climbing). Imagine all of the switches broken in this scenario (normally open). It would be like the ladder could be split in two, but if one of the ladder runs (switches) is closed by engaging it, then that run would connect both sides of the ladder and the two sides of the ladder would have a connection.

    There is a diagram on the USB page of the various limit switch configurations. If you need more information (visual and/or otherwise), please let us know and we will immediately add that information to benefit everyone.

    Click the link to add information to this solution:
    WILL THE USB BREAKOUT BOARD WORK WITH MACH3?

  • Will the USB breakout board work with Mach3?

    Our newer USB board will work with Mach3 and can be found here at this URL:

    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    Additional Information:
    Mach3 breakout board including software

    Click the link to add information to this solution:
    Will the USB breakout board work with Mach3?

  • I can't get the Mach3 USB interface to work

    Please follow the steps on the following webpage:

    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Click the link to add information to this solution:
    I can't get the Mach3 USB interface to work

  • DOES MACH3 WORK ON A MAC?

    There are several CAD/CAM programs out there for MacOS. Here is a list of a few: http://www.macuser.de/forum/f53/3d-2d-cad-395058/#post4499316
    I've also read good things about punchCAD: http://www.punchcad.com/
    Of course, there is always SketchUp if you are in a pinch. There are a few CAM plugins for SketchUp as well, but I've never used them, so I can't vouch for them.

    CAD/CAM will get you as far as designing your parts and producing the g-code, but if you also want to run the CNC machine with your Mac, you will need a piece of software similar to Mach3 or EMC to run the g-code. I haven't been able to find anything like these programs that runs on Mac, so you may have to run Mach3 or EMC in Windows using Boot Camp or a virtual machine such as VMware or Parallels.

    Personally, I would use the Mac to do all the CAD/CAM, then use a cheap PC to run the CNC machine.

    Additional Information:


    Additional Information:
    EasyDNC for OSX
    www.dnc-x.com

    Additional Information:


    Additional Information:
    Hi guys I’m new to the cnc and I’m beginning to learn how to operate and cad-cam software also my cnc runs on Mach3 my questions is if I should use MacBook to do all designs if I can have all this software to run on Mac or I have to use windows software to operate it? I have separate small computer connected to the cnc table who have Mach3 on it please help. Also if you know any other software much easy for beginners please let me know thank you guys!
    My email if needed is r1jastrzebski@gmail.com

    Additional Information:


    Additional Information:
    Hi , thank you for your advise!

    Additional Information:
    Hi , thank you for your advise!

    Additional Information:
    Hi , thank you for your advise!

    Additional Information:
    Hi , thank you for your advise!

    Additional Information:

    Click the link to add information to this solution:
    DOES MACH3 WORK ON A MAC?

  • Mach3 USB Interface Board, Backlash Compensation in Mach3 is not working. Does this board support the backlash function?

    In our experience, the backlash compensation is not an ideal mechanism to solve backlash issues. It is best to resolve the backlash issue mechanically regather than through software.

    Boards that handle all instructions on its own chip (which is the case for this all other USB boards) take some control away from Mach3. Without Mach3 having granular control. With that said, we do not have experience with the backlash compensation with that particular board. Our experience with backlash compensation with other boards have resulted in very poor accuracy and undesirable geometrical moves.

    Additional Information:
    zokkj

    Additional Information:
    zokkj

    Additional Information:
    zokkj

    Click the link to add information to this solution:
    Mach3 USB Interface Board, Backlash Compensation in Mach3 is not working. Does this board support the backlash function?

  • LIMIT SWITCH PROBLEM

    This is a common problem. Are you using shielded wire? If so, take the shield to ground. If there are any other wires in the cable that is not being used, ground those as well. Also try moving the cables as far away as possible from the motor wires and motors.

    Click the link to add information to this solution:
    LIMIT SWITCH PROBLEM

  • Why does Windows 10 block the RnRmotion.dill for Mach3 USB interface from being downloaded?

    Yes, Mach3 (the software profram) will work with Windows 7, and windows 10 when coupled with the Mach3 USB interface. If you intend to use the parallel port driver, stick with Windows 7 in 32-bit mode.

    Additional Information:
    Rnrmotion.dll is a dynamic link library which is very similar in function to an executable program, or app. Since a dll is executable, malicious code can be embedded in that type of file, so windows will automatically flag all files of this type. You just need to make sure you are downloading from a trusted source. The emotion.dll file on our site is clean, but still run run windows defender against it to make sure.

    Click the link to add information to this solution:
    Why does Windows 10 block the RnRmotion.dill for Mach3 USB interface from being downloaded?

  • Why does Windows 10 block the RnRmotion.dill for Mach3 USB interface from being downloaded?

    Rnrmotion.dll is a dynamic link library that is very similar in function to an executable program, or app. Since a dll is executable, malicious code can be embedded in that type of file, so windows will automatically flag all files of this type. You just need to make sure you are downloading from a trusted source. The emotion.dll file on our site is clean, but still, run windows defender against it to make sure.

    Click the link to add information to this solution:
    Why does Windows 10 block the RnRmotion.dill for Mach3 USB interface from being downloaded?

  • What power supply do you recommend for the spindle and limit switches if I buy the USB Mach3 breakout board?

    Any of the following power supplies will be fine for powering the Mach3 USB controller:
    https://www.buildyourcnc.com/item/24v

    however, the limit switches do not need high current, so the following power supply is sufficient for the task of connecting limit switches:
    https://www.buildyourcnc.com/item/electronicsAndMotors-power-supply-24v-1a-dc

    Click the link to add information to this solution:
    What power supply do you recommend for the spindle and limit switches if I buy the USB Mach3 breakout board?

  • how long does it take to receive your MACH3 Lic??

    We send out the Mach3 license on the same day unless the purchase was made on a weekend. You can call us anytime to expedite the license email.

    Click the link to add information to this solution:
    how long does it take to receive your MACH3 Lic??

  • THE SEND MAIL IN CONTACT US PAGE OF BUILDYOURCNC.COM WEBSITE DOES NOT WORK. ALSO CALLED MAILTO:

    You will need to change the default attribute of the browser that you are using (i.e. Google Chrome, IE, Firefox).

    Instructions to change this default attribute:
    1. Click on the "start menu"
    2. Click on "control panel"
    3. Click on "programs"
    4. Click on "default programs"
    5. Click on "set you default programs"
    6. Select the browser that you would like to fix
    7. Click on "choose defaults for this program"
    8. Find where it says "mailto" and set that to the default that you desire.

    Click the link to add information to this solution:
    THE SEND MAIL IN CONTACT US PAGE OF BUILDYOURCNC.COM WEBSITE DOES NOT WORK. ALSO CALLED MAILTO:

  • Can I add a relay to the Mach3 USB controller?

    Yes, you can add a relay to the Mach3 USB controller. The relay must be a 24V relay on it's input side and be able to be set to active low. I demonstrate this in a video on the following page:
    https://buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    The video is titled: Mach3 USB Controller Outputs

    Click the link to add information to this solution:
    Can I add a relay to the Mach3 USB controller?

  • Where is pin 2 and 3 on mach3 USB breakout

    The Mach3 USB Breakout board (USB Interface) does not have numbered pins like on the parallel breakout board. Instead, the pins are labeled to the device (driver, relay, etc.) that they plug into.

    The communication from Mach3 is sent over USB cable D- and D+ (data lines). The communication is in the form of instructions rather than steps pulses and direction signals like on the parallel breakout board. The instructions are signals like "move the x axis to this coordinate" and the microcontroller on the board interprets that instruction and creates its own step and direction signals to the terminals on the board that plugs into the drivers and other devices.

    If you follow the diagram below you should not have any problems.
    https://www.buildyourcnc.com/Documents/Electric%20Wiring%20Diagram.pdf

    Remember to provide power to the I and O terminals as per the diagram.


    Additional Information:

    Click the link to add information to this solution:
    Where is pin 2 and 3 on mach3 USB breakout

  • Can I have a slave axis on Mach3 USB Board?

    Yes, you can. You can slave the axis with two motors by using the "A" (AD and AP) terminals for the slaved motor on the axis with two motors. In Mach3, click the config menu and select "slave axis". Select the axis that contains the slave axis and select the A Axis radio button under that axis.

    Click the link to add information to this solution:
    Can I have a slave axis on Mach3 USB Board?

  • Can I use Mach3 or 4 with your USB controller PCA?

    The USB controller board is currently only compatible with Planet-CNC software.

    Click the link to add information to this solution:
    Can I use Mach3 or 4 with your USB controller PCA?

  • I have wired the step motors with the USB breakout board. When I jog the y axis it travels in the wrong direction. How do i switch the motors rotation?

    For the USB controller and reversing the rotation for a motor, you would need to do this in the software (planet-cnc). In the configuration, you will need to reverse the direction by inverting the direction output.

    Technically, the motor changes direction when the direction signal changes from a high to a low, or vice verse. For instance, the motor turns in one direction when the direction signal is, say, low. The motor will turn in the other direction when the direction signal is high. High is 5v and low is 0v or gnd.

    Click the link to add information to this solution:
    I have wired the step motors with the USB breakout board. When I jog the y axis it travels in the wrong direction. How do i switch the motors rotation?

  • is Planet-CNC USB Board and Mach3 USB Board the same

    Mach3 is not compatible with the USB breakout board, so you need Planet CNC in its place.

    Additional Information:

    I am confused by this same issue. I am using the Mach3 USB interface board with Mach3 and it works fine. In fact a video of it is on this very website. (link below)

    Is the Mach3 USB interface board the same thing as Planet-CNC USB board?
    It has been stated on this FAQ that it cannot be used with Mach3 and can only be used with Planet CNC USB software.

    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    Click the link to add information to this solution:
    is Planet-CNC USB Board and Mach3 USB Board the same

  • How do I use the outputs on the Mach3 USB controller?

    I created a video to demonstrate how to use the outputs on the Mach3 USB controller. You can find this video on the following page:
    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    Scroll down to the 5th video on that page. The title of the video is: Mach3 USB Controller Outputs

    Click the link to add information to this solution:
    How do I use the outputs on the Mach3 USB controller?

  • I am converting from a Parallel Port to the Mach3 USB. My limit switches can accomodate up to 5VDC and I want to Drive a Relay from one of the outputs. Will my switches work and do I need a 24VDC Relay?

    Yes, the best way to attach a relay to the output of the Mach3 USB board is to use an SSR (Solid State Relay) at the 24 Volt rating. This is the standard supply for this side of the Mach3 USB board.

    Click the link to add information to this solution:
    I am converting from a Parallel Port to the Mach3 USB. My limit switches can accomodate up to 5VDC and I want to Drive a Relay from one of the outputs. Will my switches work and do I need a 24VDC Relay?

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