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Question #: 277

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

Current Solution

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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Other Possible Solutions to this Question

  • WHY IT DANGEROUS TO HAVE YOUR MOBILE PHONE IN OPERATION DURING REFUELING AT A GAS STATION?

    I can't think of any reason that it would be dangerous. However, I checked with the Cellular Telecommunications Industry Association. The Chairman of the Association sent the following memo on 18 June 1999, to the Associations' Board of Directors and others:
    "You may have received inquiries about wireless phones causing fires or explosions at gas stations. In particular, you may have been asked about an alleged explosion at a gas station in Indonesia. We have been unable to verify any such occurrence in Indonesia or anywhere else. Moreover, in our discussions with Shell Oil they have stated they have attempted to verify these reports and also have not been able to document any such occurrence."
    Nonetheless, in an abundance of caution, some manufacturers have included language in the owner's manuals for their products that recommends wireless phone users turn off their phones while at refueling points (gas stations). In addition, we have received information that Exxon will begin issuing warning signs at all domestic gas stations advising drivers to turn off all wireless communications devices when entering Exxon gas stations.

    While wireless phone owners should always consult their owner's manual for information on the use of the phone, we are not aware of any incident that would justify these concerns."

    Gen Roessler, Editor
    HPS website

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    WHY IT DANGEROUS TO HAVE YOUR MOBILE PHONE IN OPERATION DURING REFUELING AT A GAS STATION?

  • DOES CELL PHONE VIBRATION ON YOUR STOMACH DURING PREGNANCY AFFECT THE BABY?

    A cell phone emits electromagnetic radiation of various frequencies at very low intensity and would not affect the development of a fetus whose mother placed the cell phone on her abdomen during her pregnancy. The mother's reproductive and developmental risk for her growing embryo would not be altered by these exposures. If you are healthy, young, and have no reproductive problems or family history of reproductive or developmental problems, your risk for birth defects is 3% and for miscarriage, 15%. These are background risks with which every woman begins her pregnancy. Neither you nor I can change these risks. Good luck with your pregnancy.

    Robert Brent, MD, PhD

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    DOES CELL PHONE VIBRATION ON YOUR STOMACH DURING PREGNANCY AFFECT THE BABY?

  • When using shielded wire from driver to stepper motor, where should I connect the shielding? Should it be ground on transformer or something/somewhere else?

    If you are using shielded wire between the motor and driver, the shielded portion (the reflective jacket within the insulated portion of the wire) and any spare wires, or stranded wire should all be grounded and be inserted into the GND terminal on the driver.

    Click the link to add information to this solution:
    When using shielded wire from driver to stepper motor, where should I connect the shielding? Should it be ground on transformer or something/somewhere else?

  • Good morning, we purchased the vfd with 220v but here in south america the standard is 110v, will it work? or should I adapt one power outlet to 220v

    If you purchased a 220 volt VFD (Variable Frequency Drive), you will need to use a 220 volt outlet. A VFD that has an input voltage rating of 220 volts will not work with 110 volts being applied to the VFD. We do sell 110 volt VFDs but you will also need a spindle that pairs with the 110 volt VFD.

    Click the link to add information to this solution:
    Good morning, we purchased the vfd with 220v but here in south america the standard is 110v, will it work? or should I adapt one power outlet to 220v

  • Using your USB control board, is it possible to install and use a Z axis touch plate? If yes, what board connections would it be installed to?

    The instructions on how to use a plate for z-axis homing (moveable sensor) can be found here:

    http://www.planet-cnc.com/faq/moveable_sensor/

    Click the link to add information to this solution:
    Using your USB control board, is it possible to install and use a Z axis touch plate? If yes, what board connections would it be installed to?

  • Will MDF slat wall make a good spoil board, or should I cut my own T slots in a solid MDF panel?

    MDF makes an excellent spoilboard, but I like to use regular old plywood. MDF may have some nasty constituents so I try to stay away from this material. Depending on your method of fixturing and clamping, you may not need t-slots at all, but that is up to you and your application. I just screw my workpiece down and I also simply screw my spoilboard down into my table (using a regulas hole pattern.

    Click the link to add information to this solution:
    Will MDF slat wall make a good spoil board, or should I cut my own T slots in a solid MDF panel?

  • I have a blue brew break-out board. Do I use a seprate power supply for it and what amp output should it have if used.

    We generally use the USB to power the interface (breakout board). The current from the computer is sufficient to supply the breakout board.

    Click the link to add information to this solution:
    I have a blue brew break-out board. Do I use a seprate power supply for it and what amp output should it have if used.

  • I have a blue brew break-out board. Do I use a seprate power supply for it and what amp output should it have if used.

    We generally use the USB to power the interface (breakout board). The current from the computer is sufficient to supply the breakout board.

    Click the link to add information to this solution:
    I have a blue brew break-out board. Do I use a seprate power supply for it and what amp output should it have if used.

  • WHAT EFFECTS OF CELL PHONES WILL THERE BE ON YOUNGER PEOPLE OPPOSED TO OLDER PEOPLE? THE AGE OR STATE DEVELOPMENT EFFECT DANGERS A PHONE?

    Physical size of the subject affects the fraction of the total radiofrequency energy that is absorbed in the body. To account for this known effect, the maximum permissible exposure standards for radiofrequency energy were set for the worst-case condition, that is assuming the body size for maximal absorption at a given frequency. Thus the maximum permissible exposure standards are fully protective for bodies of different sizes. For more detailed information, see the answers and the cited references to questions 79, 109, 694, and 893 under the Nonionizing Radiation section of the Health Physics Society Ask The Expert Web page. Gary H. Zeman, ScD, CHP

    Click the link to add information to this solution:
    WHAT EFFECTS OF CELL PHONES WILL THERE BE ON YOUNGER PEOPLE OPPOSED TO OLDER PEOPLE? THE AGE OR STATE DEVELOPMENT EFFECT DANGERS A PHONE?

  • X axis won't move on 5x10 GreenBull, it just shutters unless I manually with my hand give it a push then it will jog. What should I check?

    If your axis shutters and will not move unless moved by another force, that sounds like your acceleration is set too high. Lower the acceleration until it works well, then lower it a bit more to have a margin of safety.

    Users response:
    I've lowered my acceleration to 1 in the StepCon program and it still shutters when I jog it, anything else I could check?

    Buildyourcnc response:
    IF that didn't work, try swapping the X and Y drivers. That way you will pinpoint if the issue is the driver. If the proplem persists, then there may be an issue with the motor itself.

    Buildyourcnc response:
    The X and Y drivers can be easily swapped by swapping only the motor wires.

    - Remove the x-axis motor wires from the X driver.
    - Remove the Y motor wires from the Y driver.
    - Insert the X motor wires into the Y driver.
    - Insert the Y motor wires into the X driver.

    Buildyourcnc response:
    Now the Y-axis will move the gantry. Test the Gantry movement by moving the Y axis using the up and down arrow keys (mach3).

    Users response:
    Problem is now solved, I switched the X and Y at the redFly and got the same problem, so then I undid the wires going to each motor and switched them there and it I had a bad solder point in the X axis connector, thank you for the help

    Buildyourcnc response:
    You're very welcome. We will make sure to thoroughly check the solder points on the cable connectors prior to a redFly delivery.

    Click the link to add information to this solution:
    X axis won't move on 5x10 GreenBull, it just shutters unless I manually with my hand give it a push then it will jog. What should I check?

  • If I buy the Combo #1 with hardware, plans for $255.00 and get all the required parts, will i be able to use with Autodesk 123D?

    Yes, you can use the Autodesk123D CNC Utility found here: http://www.123dapp.com/aboutcnc

    This utility will work with any standard CNC machine. Our machines use standard electronics and you choose the software that controls the CNC machine.

    Click the link to add information to this solution:
    If I buy the Combo #1 with hardware, plans for $255.00 and get all the required parts, will i be able to use with Autodesk 123D?

  • For tuning the motors in mach 3 should I be running a gcode or is keyboard jogging enough to determine the stall rates

    It seems to be getting some kind of interference or a short within the wiring or communication, try jogging the motors in the software without anything wired to the board. Then add one motor at a time to see if there is a short within your wiring or a faulty driver/motor.
    If the USB breakout board continues to move the x-axis with no motors or driver wired to it, please email customerservice@buildyourcnc.com for a replacement or further troubleshooting.

    Click the link to add information to this solution:
    For tuning the motors in mach 3 should I be running a gcode or is keyboard jogging enough to determine the stall rates

  • For tuning the motors in mach 3 should I be running a gcode or is keyboard jogging enough to determine the stall rates

    Keyboard jogging will give you a good start at motor tuning since going from a stop to rapid travel speed is the quickest the machine will be required to accelerate. However, best practice is to also run test files and actually cut the type of materials you expect to deal with to test machine performance under load and make any fine adjustments needed for maximum performance.

    Click the link to add information to this solution:
    For tuning the motors in mach 3 should I be running a gcode or is keyboard jogging enough to determine the stall rates

  • if I wanted to use your inductive proximity sensor's with your USB interface board what would I need besides the sensors I would be using 5 of the sensors.

    I would suggest using the NPN proximity sensor for the Mach3 USB or the Pokeys57cnc. The proximity sensors have a top DC voltage limit of 30 volts, so it would be best to use the 24V power supply that is used to power the controller. Both controllers have a 24V power requirement, so that is convenient.

    The blue wire of the proximity sensor is the GND wire and is connected to the 24V power supply's V- terminal. The brown wire is the positive wire and is connected to the V+ terminal of the 24V power supply. The black wire is the signal wire and is connected to the input terminal of the controller.

    Click the link to add information to this solution:
    if I wanted to use your inductive proximity sensor's with your USB interface board what would I need besides the sensors I would be using 5 of the sensors.

  • Are the linear slide bearings good quality? Should I expect all 30 to be equal in quality and use them to produce a very accurate CNC machine?

    Which linear slide bearings are you referring?

    The ones that come in the pack of 24 or 30

    Click the link to add information to this solution:
    Are the linear slide bearings good quality? Should I expect all 30 to be equal in quality and use them to produce a very accurate CNC machine?

  • Have checked stepper motor wires dozens of times and they are wired like diagram says. Stepper motors will not turn under power. I am using laser control option. What should I do?

    This sounds like a problem with the step (pulse) signal. The driver motors receive two signals from the computer via the board -- one is high or low and tells the motors which direction to turn, one is a square wave pulsed signal(quick that tells the motor to turn or a constant high signal that tells the motor to maintain its position. With an oscilliscope you can check for proper signal at the board. If you bought the board from us, please contact us to arrange a return authorization.

    Click the link to add information to this solution:
    Have checked stepper motor wires dozens of times and they are wired like diagram says. Stepper motors will not turn under power. I am using laser control option. What should I do?

  • I AM USING A XYLOTEX 3 AXIS BOARD AND WANT TO ADD ANOTHER MOTOR SLAVED THE X-AXIS. WILL DRIVE CW230 WORK?

    If the pins from the terminal block on the side of the board are outputs, or at least 2 of them are outputs, then you can connect our modular driver to the board (example: cw230). If they are all inputs, then you would not be able to connect an external driver.

    Click the link to add information to this solution:
    I AM USING A XYLOTEX 3 AXIS BOARD AND WANT TO ADD ANOTHER MOTOR SLAVED THE X-AXIS. WILL DRIVE CW230 WORK?

  • I have your nema 24 motors using the 36v power supply. Should I use the Bipolar series for the wiring the motors since I am using the 36 volt ad not a 24v power supply?

    When connecting our power supply, no matter if it is 24 or 36 volts with our drivers/motors, you should always use bipolar parallel. This will allow you to have the best torque at higher speeds.

    Click the link to add information to this solution:
    I have your nema 24 motors using the 36v power supply. Should I use the Bipolar series for the wiring the motors since I am using the 36 volt ad not a 24v power supply?

  • Helo. I'm using Meshcam to generate the toolpaths. What type of files should I "save as" for the greenbull CNC using Mach3 with the UC100 USB to Parallel?

    The file type to save for use with Mach3 is .tap or .nc. Make sure that you specify Mach3 as the post processor in Meshcam.

    Click the link to add information to this solution:
    Helo. I'm using Meshcam to generate the toolpaths. What type of files should I "save as" for the greenbull CNC using Mach3 with the UC100 USB to Parallel?

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