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Question #: 14633

Question: When connecting homing switches, should I use more than one input?

Current Solution

It is ok to connect the limit/homing switches to the same input.  The machine will go through a procedure that will start with the first axis, hit the switch, pull off, move more slowly for better accuracy, then pull off again.  This procedure makes sure that the input is always in the correct state while homing.

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Other Possible Solutions to this Question

  • I need info on connecting my vfd to run via mach3. Any videos please? Thanks.

    I will be making a video on controlling the VFD via Mach3 shortly.

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    I need info on connecting my vfd to run via mach3. Any videos please? Thanks.

  • When we simulate cutting a part, the part is 40% larger than it should be. Why?

    What software are you using to simulate the CAM machining operations?

    Additional Information:
    I drew my part in ViaCad, opened part in CamBam to produce GCode, then Mach3 to simulate cutting part. Everything worked as it should but part was too large.

    Additional Information:
    It sounds like steps per unit is not calibrated properly. Use the Mach3 to calibrate the axes. In the settings tab, there will be axis calibration labeled just above the reset button. There is a button just just below axis calibration called set steps per unit. When the button is clicked, mach3 will present you with a dialog box asking for a measurement of how far to move the specific axis you need to calibrate (use a number that will not make the machine over run the axis). The machine will move to a certain length. Measure that length and enter it into the next dialog box that Mach3 presents to you. Do this for each axis.

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    When we simulate cutting a part, the part is 40% larger than it should be. Why?

  • Why should I use a spindle rather than a router?

    The spindle is quieter and has more consistent torque (It doesn't get "bogged down" when it starts cutting into material). It can be used with collets of varying sizes (not restricted to imperial sizes). It is water cooled and so it does not blow air downward to cool the spindle like the router does. The spindle is also machined with much higher precision than typical routers and will have a much longer life.

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    Why should I use a spindle rather than a router?

  • What wiring should I use to connect two motors for one axis?

    Yes, you can use 2 motors in the same axis output, however you will still need a driver for that motor! Also depending on the orientation on which you mount the motor you might have to invert the direction of the motor, and that will be simple by swapping the A+,A-, to the B+,B- locations and vice versa, from the driver to the motor wiring.

    Also you can run a slave motor using another axis on the board, and setting it up in the Planet-CNC settings.

    Planet-CNC/File/Settings/Axes, here you will enter 3 in the Number of Axes location, and then change the Function of the Axis 4 to Slave 1. There you will have the 4th axis or A-axis be a slave for the x-axis.
    Slave 1 - X-Axis
    Slave 2 - Y-Axis
    Slave 3 - A-Axis
    Slave 4 - B-Axis
    Etc...

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    What wiring should I use to connect two motors for one axis?

  • Is the white ant capable of connecting to any other program besides replicator g? Is so which ones?

    The whiteAnt has only been tested with the replicatorG application. There is no reason that another program cannot be used as long as the program is compatible with the gen4 electornics.

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    Is the white ant capable of connecting to any other program besides replicator g? Is so which ones?

  • Should I wire the e-stop button to an input terminal or the mains voltage

    I would recommend wiring the E-Stop to an input terminal via an NC connection. This is the industry standard. It requires a NC (Normally connected) circuit for the machine to be operational, and when the circuit breaks, the machine shuts off. This is better than having a circuit NO (normally open), open circuit that requires a circuit to be created to have the machine shut off for safety.

    Having en E-Stop run through the mains line would only work for a single circuit (or use multiple E-stops, which defeats the purpose). The E-stop connected to the input terminal would shut off all machine functions.

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    Should I wire the e-stop button to an input terminal or the mains voltage

  • where on your mk1 usb controller is the input port i can use for pause or estop comand thanks

    On our USB breakout boards, the pins available for any inputs (e-stop/limit switches).
    Are x++ - a-- (x++,x--,y,z,a(same)) in the settings menu you will have to specify the pin!

    Here is a good forum on Planet-CNC.com to help setting up Planet-CNC software:(http://www.planet-cnc.com/faq/machine_setup/)

    Additional Information:


    Additional Information:
    In the planetcnc software the inputs are greyed out I have a licenced copy and I have all limits setup and working correctly id like to use the a++ or a-- as a manual program pause if my plasma fails torch ignition and id like it to continue after re ignition. When the mk1 controller is unplugged the inputs are available but when the controller is plugged in there greyed out is these options unavailable with your controller please help.

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    where on your mk1 usb controller is the input port i can use for pause or estop comand thanks

  • what type of lubrication should one use on a 20 mm leadscrew and 20 mm round recirculating rail bearings

    You will want a grease that can be used in high temperature and heavy load situations also called high load bearing grease. A simple google search will yield many results from which to choose. We plan to carry this product in the near future (by the time you read this, we may already carry it).

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    what type of lubrication should one use on a 20 mm leadscrew and 20 mm round recirculating rail bearings

  • COULD YOU PLEASE EXPLAIN, IF IT'S TRUE, THAT HANDS-FREE CELL PHONE CAR MICROPHONES RADIATE MORE THAN ANY OTHER INSTRUMENT USED WITH THESE PHONES?

    Hands-free cell phone car microphones have been tested by the manufacturers and meet the current ANSI/IEEE (American National Standards Institute/Institute of Electrical and Electronics Engineers) standards for radiofrequency (RF) safety. These are the same standards that the Federal Communications Commission enforces under the Telecommunications Act of 1996, and they place limits on the specific absorption rate (SAR) of RF energy in the body. Recent inflammatory articles in the British press were not substantiated by testing at ISO-accredited testing facilities at Motorola. Manufacturers of cell phones are required under FCC regulations to assure that their products meet the SAR limits on both hand-held and hands-free units. Further information can be obtained on the Internet at The Center for Devices and Radiological Health (FDA information) or Office of Engineering and Technology (FCC information).

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    COULD YOU PLEASE EXPLAIN, IF IT'S TRUE, THAT HANDS-FREE CELL PHONE CAR MICROPHONES RADIATE MORE THAN ANY OTHER INSTRUMENT USED WITH THESE PHONES?

  • WILL IT BE HARMFUL TO USE MY MOBILE PHONE DURING PREGNANCY? IF HARMFUL, SHOULD I DISCONTINUE USING OR MODERATELY?

    Thank you for your inquiry about the risk to your embryo by using a cellular phone during pregnancy. Sometimes it is not made clear to the public that there are different kinds of radiation. The electrical fields from a cellular phone are nothing like x ray. The energy is so low in the electrical waves of cellular phones that it does not represent a risk to the developing embryo. If you use the cellular phone conventionally by placing it to your ear, you further reduce the exposure to the embryo, which is already extremely low because of the distance of the phone from your ear to your uterus. There are no studies dealing with the risks of cellular phones on the outcome of pregnancy in humans, but numerous animal studies indicate that the exposures from the phones do not represent a risk for birth defects or miscarriage. Of course you must realize that every healthy pregnant woman begins her pregnancy with a 3% risk for birth defects and a 15% risk for miscarriage. Good luck with your pregnancy.

    Robert Brent MD, PhD, DSc(Hon)

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    WILL IT BE HARMFUL TO USE MY MOBILE PHONE DURING PREGNANCY? IF HARMFUL, SHOULD I DISCONTINUE USING OR MODERATELY?

  • WHEN SHOULD INFLUENZA (THE FLU) VACCINE BE GIVEN?

    You can begin offering vaccine as soon as vaccine becomes available. Early vaccination of children younger than age 9 years who are first time vaccinees can be helpful in assuring routine second doses before the influenza season begins.

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    WHEN SHOULD INFLUENZA (THE FLU) VACCINE BE GIVEN?

  • WHEN SHOULD INFLUENZA (THE FLU) VACCINE BE GIVEN?

    ACIP recommends annual influenza vaccination for all children age 6 months and older who do not have a contraindication to the vaccine.

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    WHEN SHOULD INFLUENZA (THE FLU) VACCINE BE GIVEN?

  • WHEN SHOULD INFLUENZA (THE FLU) VACCINE BE GIVEN?

    ACIP recommends annual influenza vaccination for all children age 6 months and older who do not have a contraindication to the vaccine.

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    WHEN SHOULD INFLUENZA (THE FLU) VACCINE BE GIVEN?

  • WHAT LENGTH OF MOTOR CABLE SHOULD BE USED WTIH THE BLUECHICK V4.2

    The recommended total length of motor cable should be 15 feet for the blueChick v4.2

    Z - 6 feet
    Y - 5 feet
    X- 4 feet

    20 AWG 4 conductor

    If your drivers will be positioned farther from the machine, you may need longer cable.

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    WHAT LENGTH OF MOTOR CABLE SHOULD BE USED WTIH THE BLUECHICK V4.2

  • What kind of wire should I use between the invertor and the spindle?

    The type of wire that should be used between the spindle and the VFD (Variable Frequency Driver also called the inverter) should be of stranded type and we use between 18 and 16 AWG.

    The total current is divided among the three coil wires, therefor a wire gauge of 16 should be sufficient.

    Currently we use 20AWG 4 conductor.

    Additional Information:

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    What kind of wire should I use between the invertor and the spindle?

  • What wire gauge should be used for the 36V 8.8 amp power supply

    Most of our power supplies allow for a 9 amp current draw.

    For the Neutral, Live and earth ground, wire gauge for that level of current is 14 for relatively short cable lengths. Increase the gauge for longer lengths past 25 feet.

    For the DC 24V output terminals to the drivers, 20 gauge is fine. If the power supply is connecting to only one driver, increase the wire gauge to 14.

    Additional Information:
    What gage wire should I use from motor to driver

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    What wire gauge should be used for the 36V 8.8 amp power supply

  • What thermocouple or thermister should I use for the extruder hot end?

    The best choice would be a type K thermocouple.

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    What thermocouple or thermister should I use for the extruder hot end?

  • When Blacktooth is powered on the motors get power but will not turn. What should I do?

    The motors could be wired incorrectly causing them to lock up. Make sure to check the wiring to make sure the X and Y are connected to the correct terminals.

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    When Blacktooth is powered on the motors get power but will not turn. What should I do?

  • Are there any special instructions regarding connecting water lines to the 2.2k spindle?

    There is no specific manner in connecting the water lines to the spindle. No specific output and input locations, only the diameter which we use is 1/4 Inside Diameter and 3/8 Outside Diameter (you might find another one that works just as well).
    Unscrew the 2 hose nuts and feed the tube through (will be snug), and adjust the tube on the hose fittings and screw the hose nuts down. Feed the tubes through your machine towards the water bucket, making sure it will not get caught on any moving parts and cause a jam/leak, and fit one tube to the outlet of your water pump and leave the other tube to the bucket as a return line. (unless you are using a cooler like a radiator, then feed it to the outlet of the radiator and to your water pump)

    Click the link to respond:
    Are there any special instructions regarding connecting water lines to the 2.2k spindle?

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