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Question #: 13673

Question: Were are the mounting locattions of the 6 Limit switches on the Blackfoot 4.3

Current Solution

Here are the recommended locations for limit switches for our CNC machine kits.

The x-axis limit switches should be located on a single gantry. This makes the wiring of the limit switches close in proximity and more manageable.
https://www.buildyourcnc.com/images/IMG_6367-800.JPG

The y-axis limit switches should be located at each end of the gantry. This keeps the switches stationary and impose minimal movement of the wire for better wire management.

One end of he gantry:
https://www.buildyourcnc.com/images/IMG_6361-800.JPG

Other end of the gantry:
https://www.buildyourcnc.com/images/IMG_6360-800.JPG

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Other Possible Solutions to this Question

  • Are there any videos detailing wiring of limit switches and stop button?

    This video may serve helpful on the homing and limit switches:
    https://www.buildyourcnc.com/PrimeronHomingandLimitSwitches.aspx

    I don't go into great detail on the wiring, however. If after you watch that video and you still need a video, please let me know and I will make a video on the wiring of limit switches and the E-stop button.

    Click the link to respond:
    Are there any videos detailing wiring of limit switches and stop button?

  • BlackFoot CNC: Where should z-axis limit switches be placed?

    The limit switch for the z-axis should be placed in a location where nothing can interfere with CNC process, now for our blackFoot, referring to step 115(https://www.buildyourcnc.com/blackFoot48v40.aspx#prettyPhoto/120/) it will be placed 1-1/4"(may be adjusted) down from the top wood piece(vacuum holder). So contact will be made from the location of the anti-backlash nut wood piece and the limit switch stopping it from going to high.

    Click the link to respond:
    BlackFoot CNC: Where should z-axis limit switches be placed?

  • How are limit switches connected to the AWC708 controller?

    If you are using the AWC708 or equivalent laser controller, the limit switches will connect between the EL input terminal and the GND terminal in normally open (NO) connection. Most limit switches can be connected as NO, or normally closed (NC).

    For instance, a limit switch for the X- limit will be connected from the ELX- terminal to the NO connection of the limit switch, then a connection from the GND terminal on the laser controller to the COM connection to the same limit switch.

    Click the link to respond:
    How are limit switches connected to the AWC708 controller?

  • Using USB Controller Board with Planet-CNC software. The S/W recognizes limit switches but not soft limits. Help?

    "Soft limits are used to decelerate machine to stop before machine is stopped hard way at limit switch or before it crashes. I recommend "Soft Limits Decelerate" and "Soft Limits Strict" settings are also checked. Sometimes we need to disable soft limits and there is a command for this in menu "Machine/Soft Limits". When soft limit is triggered position display will be yellow."

    Are the soft limits "grayed out"?
    Here is a link to a very useful forum post from the Planet-CNC crew:
    http://www.planet-cnc.com/faq/machine_setup/



    Additional Information:
    i keep getting scratches when engraving pictures on dog tags

    Click the link to respond:
    Using USB Controller Board with Planet-CNC software. The S/W recognizes limit switches but not soft limits. Help?

  • There are no limit switches in my Greenbull 5x10 kit. Are these no longer needed?

    You most definitely should have received limit switches in your package. We will send you the missing limit switches.

    But to directly answer your question; no, limit switches are not needed with CNC machines. You can set up soft limits to make sure the machine does not go out of bounds.

    With that said, if the motors stall for some reason and the computer does not know the actual position of the gantry or the spindle, then the machine may actually go out of bounds and the machine may hit a physical limit. With or without limit switches, the machine will stop.

    Additional Information:
    Please call the office so that we know who you are and we can send the limit switches to the correct person.

    Click the link to respond:
    There are no limit switches in my Greenbull 5x10 kit. Are these no longer needed?

  • Where are the limit switch connections made when the switches are in series, and NC??

    One end of the limit switch circuit will be connected to the pin and NC, and the other end will be connected to COM and GND.

    For example: (the "-" is wire.)

    [Breakout board input pin] ---- ([NC on switch] [com on switch]) ---- [NC on switch] [com on switch] ---- [back to GND on the breakout board]

    An explanation of the limit switch connections is located on the brakout board datasheet: https://www.buildyourcnc.com/item/electronicsAndMotors-parallel-breakout-relay (instruction step # 1.

    Click the link to respond:
    Where are the limit switch connections made when the switches are in series, and NC??

  • When wiring NC limit switches in series to the V5 BOB where are the connections made on the BOB?

    The breakout board has input pins on one side. Use these pins to connect limit switches. The return of the circuit goes to gnd which is located on the same side, where the input pins are located.

    Click the link to respond:
    When wiring NC limit switches in series to the V5 BOB where are the connections made on the BOB?

  • Do you have a more detailed diagram of the rotary and 15A limit switches on the vlxl?

    Are you trying to determine how to wire the switches or where to place them on the Vertical Laser XL? Let me know and I will provide some pictures or video on how to do this.

    Additional Information:
    Kind of both. Have somewhat of an idea as to how to wire them but you included rotary and other limit switches. Not sure which ones to put where. Never worked with these before.

    Click the link to respond:
    Do you have a more detailed diagram of the rotary and 15A limit switches on the vlxl?

  • What are the mounting hole dimensions of the 1/2" Anti-Backlash Lead Nut

    The mounting hole dimension for the 1/2" 10 TPI 5 starts antibacklash nut is 1.13" or 28.7 mm. I added a drawing to the antibacklash nut product webpage so you can see other dimensions.

    Antibacklash nut product webpage: https://www.buildyourcnc.com/item/mechanical-leadscrews-antibacklash-nut-!5-5-starts-10-tpi

    Thanks

    Additional Information:
    You can also see the drawing directly here: https://www.buildyourcnc.com/images/Antibacklash_nut_1_2_drawing-800.JPG

    Click the link to respond:
    What are the mounting hole dimensions of the 1/2" Anti-Backlash Lead Nut

  • How should I connect the limit switches to my laser controller?

    If you are using the AWC708 or equivalent laser controller, the limit switches will connect between the EL input terminal and the GND terminal in normally open (NO) connection. Most limit switches can be connected as NO, or normally closed (NC).

    For instance, a limit switch for the X- limit will be connected from the ELX- terminal to the NO connection of the limit switch, then a connection from the GND terminal on the laser controller to the COM connection to the same limit switch.

    Click the link to respond:
    How should I connect the limit switches to my laser controller?

  • What is the wiring configuration for limit switches on the laser controller?

    If you are using the AWC708 or equivalent laser controller, the limit switches will connect between the EL input terminal and the GND terminal in normally open (NO) connection. Most limit switches can be connected as NO, or normally closed (NC).

    For instance, a limit switch for the X- limit will be connected from the ELX- terminal to the NO connection of the limit switch, then a connection from the GND terminal on the laser controller to the COM connection to the same limit switch.

    Click the link to respond:
    What is the wiring configuration for limit switches on the laser controller?

  • In the video 'Primer on Homing and the Use of Limit Switches' Patrick refers to pin number "13". Is this in fact pin "i3"?

    The parallel breakout board uses pins 10 to 13 relating specifically to the pin numbers on the parallel port. It is in fact 13 and not i3.

    The mach3 USB board does use the I1-I4 using the I to represent the word "input"; hence I3 (i3).

    Thanks for the question and wanting clarification.

    Click the link to respond:
    In the video 'Primer on Homing and the Use of Limit Switches' Patrick refers to pin number "13". Is this in fact pin "i3"?

  • Do you sell 22 to 24 AWG stranded and shielded for wiring of the limit switches and E_Stop?

    The wire that we sell for the limit switch wiring is here: https://www.buildyourcnc.com/item/3d-printer-component-cnc-electronicsandmotors-cable-wire-3-conductor-22-awg-wrcon-cablewire3conductor22awg

    This is shielded cable to make sure there isn't any external interference with sensitive components and long wires associated with limit switches. This is necessary due to the interference caused by the motors on a CNC router and the milling process.

    Additional Information:
    So unshielded is cool. That's what I was curious about. Cheers.

    Additional Information:
    Absolutely. It's really the only type of cable I would recommend for connecting limit switches.

    Click the link to respond:
    Do you sell 22 to 24 AWG stranded and shielded for wiring of the limit switches and E_Stop?

  • The rods in my blackFoot gantry connected to the x-axis motor are bowing or bending.

    We are using the 1/2" rods in the gantry now. You can opt to purchase 1/2" rods and new gantry sides which will accept 1/2" ID bearings.

    Click the link to respond:
    The rods in my blackFoot gantry connected to the x-axis motor are bowing or bending.

  • wiring limit switches in series NC to the V5 Break Out Board

    When wiring limit switches to the breakout board, generally NC (Normally Closed) are connected in series (acts like a wire that when broken, breaks the circuit). NO (Normally Open) is generally wired in parallel where if one is pressed, the wire creates a circuit connecting the pin to gnd.

    Additional Information:


    Additional Information:


    Additional Information:

    Click the link to respond:
    wiring limit switches in series NC to the V5 Break Out Board

  • Can you tell me what gauge wire is needed for limits switches and the spindle?

    The hookup wires you will need is 22 to 24 AWG stranded and shielded for the wiring of the limit switches and E_Stop. Our kit customers select various places for these switches, so we don't supply the wiring. If you don't use shielded cable, you will need to change the debounce setting in Mach3 (if that is the control program you are using).

    We typically use 14 AWG stranded wire for the VFD to Spindle (U, V, W) connections.

    Click the link to respond:
    Can you tell me what gauge wire is needed for limits switches and the spindle?

  • How long are the wires on the proximity switches you over

    The NPN proximity switches we stock have 43" (1.09 meters) of cable and the PNP proximity switches we carry have 48" (1.21 meters) of cable.

    Click the link to respond:
    How long are the wires on the proximity switches you over

  • Is a dust extraction system included as part of the CNC kit (BlackFoot and GreenBull)?

    All our machines are implemented with a dust collection system, includes holders for vacuum hose, and a brush piece that will fit your motor mount to hold as much wood/aluminum/plexi-glass particles in as possible. No vacuum is provided, must be purchased separately.

    Click the link to respond:
    Is a dust extraction system included as part of the CNC kit (BlackFoot and GreenBull)?

  • Can you provide recommended locations for limit switches on your kits?

    Here are the recommended locations for limit switches for our CNC machine kits.

    The x-axis limit switches should be located on a single gantry. This makes the wiring of the limit switches close in proximity and more manageable.
    https://www.buildyourcnc.com/images/IMG_6367-800.JPG

    The y-axis limit switches should be located at each end of the gantry. This keeps the switches stationary and impose minimal movement of the wire for better wire management.

    One end of he gantry:
    https://www.buildyourcnc.com/images/IMG_6361-800.JPG

    Other end of the gantry:
    https://www.buildyourcnc.com/images/IMG_6360-800.JPG

    Click the link to respond:
    Can you provide recommended locations for limit switches on your kits?