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Question #: 309

Question: ARE CELLPHONES HARMFUL?

Current Solution

Cellular phones are designed to be safe for both the user and anyone standing nearby. Cellular phones are actually small radios that transmit signals to and from base-station antennas located on towers or buildings in the nearby neighborhood. Cellular phones use low-power radio signals, even weaker than CB, police, or fire radios.

The American National Standards Institute (ANSI) sets safety standards for human exposure to radiofrequency (RF) electromagnetic energy in the United States. Government agencies such as the Federal Communications Commission (FCC), the Occupational Safety and Health Administration (OSHA), and many states recognize and accept the ANSI RF safety standard. Also, the United States standard for RF energy is comparable to those set in other countries.

Cellular phones and cellular-phone base stations have been shown to meet these RF safety standards. Safety standards for RF energy are threshold standards. Threshold standards define the level of RF energy above which there may be health or safety hazards and below which there have been no reported harmful effects. Unlike ionizing radiation, which many people believe to act cumulatively even at small exposure levels, RF energy at low levels is not considered a cumulative hazard. Therefore the consensus of scientific experts in this area is that RF exposure from cellular phones, meeting the threshold levels set in safety standards, is safe for all.

The specific answer to the question is that cellular phone technology is safe for all. There is no danger posed by either handheld phone units or by base-station antennas. In both cases, the radio signals transmitted from the antennas are required to meet the ANSI safety standard for RF safety as embodied in FCC regulations governing this technology. For more information:

The FCC has recently revised and reissued its Bulletin 56 on Questions and Answers about Biological Effects and Potential Hazards of Radiofrequency Electromagnetic Fields.

OSHA provides information and links to more sites on RF safety at its Web page, Radiofrequency/Microwave Radiation.

Gary Zeman, ScD, CHP Lawrence Berkeley National Laboratory

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Other Possible Solutions to this Question

  • ARE CELLULAR PHONE HARMFUL?

    Cellular phones are designed to be safe for both the user and anyone standing nearby. Cellular phones are actually small radios that transmit signals to and from base-station antennas located on towers or buildings in the nearby neighborhood. Cellular phones use low-power radio signals, even weaker than CB, police, or fire radios.

    The American National Standards Institute (ANSI) sets safety standards for human exposure to radiofrequency (RF) electromagnetic energy in the United States. Government agencies such as the Federal Communications Commission (FCC), the Occupational Safety and Health Administration (OSHA), and many states recognize and accept the ANSI RF safety standard. Also, the United States standard for RF energy is comparable to those set in other countries.

    Cellular phones and cellular-phone base stations have been shown to meet these RF safety standards. Safety standards for RF energy are threshold standards. Threshold standards define the level of RF energy above which there may be health or safety hazards and below which there have been no reported harmful effects. Unlike ionizing radiation, which many people believe to act cumulatively even at small exposure levels, RF energy at low levels is not considered a cumulative hazard. Therefore the consensus of scientific experts in this area is that RF exposure from cellular phones, meeting the threshold levels set in safety standards, is safe for all.

    The specific answer to the question is that cellular phone technology is safe for all. There is no danger posed by either handheld phone units or by base-station antennas. In both cases, the radio signals transmitted from the antennas are required to meet the ANSI safety standard for RF safety as embodied in FCC regulations governing this technology. For more information:

    The FCC has recently revised and reissued its Bulletin 56 on Questions and Answers about Biological Effects and Potential Hazards of Radiofrequency Electromagnetic Fields.

    OSHA provides information and links to more sites on RF safety at its Web page, Radiofrequency/Microwave Radiation.

    Gary Zeman, ScD, CHP Lawrence Berkeley National Laboratory

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    ARE CELLULAR PHONE HARMFUL?

  • THE MOTORS ARE NOT TURNING

    Make sure you follow the tutorial here: http://www.buildyourcnc.com/CNCElectronicsandWiring.aspx

    Click the link to add information to this solution:
    THE MOTORS ARE NOT TURNING

  • MY MOTORS ARE RUNNING VERY HOT.

    If your motors are hot to the touch, this is normal. Current is being drawn by the motor coils as the motor moves and as the motor stays at a position. If the motor is not using the current in the coils to move (holding it's position), the energy will be translated as heat (rather than motion, sound or light). Even while moving, some of the energy will be lost as heat. Remember that energy cannot be created nor destroyed.

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    MY MOTORS ARE RUNNING VERY HOT.

  • WHAT ARE CHINA PRICES FOR COLLETS?

    From: Milan Shah
    ACCU-FIX Precision Tools Pvt Ltd
    458, Manjusar GIDC, Savli, Vadodara, Gujarat, India
    Mobile: +(91) 7567975718

    ER 11 - STD. Precision Collet $3.61 - No 1/2" shank sizes.
    ER 16 - STD. Precision Collet $4.05
    ER 20 - STD. Precision Collet $4.27
    ER 25 - STD. Precision Collet $4.34
    ER 32 - STD. Precision Collet $4.69
    ER 40 - STD. Precision Collet $5.32
    ---------------------------------------------------------------

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    WHAT ARE CHINA PRICES FOR COLLETS?

  • MY PARTS ARE COMING OUT THE WRONG SIZE

    In Mach3, go to the Settings Tab, and select "Set Steps Per Unit". It will ask you how far to move the machine. Before you do this, make a mark on the table exactly where the end mill is resting. You can do this by lowering the end mill until it touches the material, then spinning it by hand to cut a small dimple in the material. Then, raise the end mill to clear the material, and assign a distance to move the machine. Once the machine moves and stops, measure the exact distance that it actually traveled with a tape measure, and enter this value into the dialog box that asks how far it moved. Mach3 will automatically adjust your steps per unit for that axis to be more accurate. Do this for all axes often to ensure you are cutting accurately. The longer distances you use calibrate, and the more precise you are with your measurements, the better.

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    -1' OR 2+886-886-1=0+0+0+1 --

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    -1' OR 2+357-357-1=0+0+0+1 or 'xkLzGxAb'='

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    -1" OR 2+279-279-1=0+0+0+1 --

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    MY PARTS ARE COMING OUT THE WRONG SIZE

  • WHAT ARE THE CABLE LENGTHS FOR BLACKTOE

    The motor cables for the blackToe are as follows:

    Total 30 feet

    X - 9
    Y - 10
    Z - 11

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    WHAT ARE THE CABLE LENGTHS FOR BLACKTOE

  • WHAT ARE THE CABLE LENGTHS FOR BLACKTOE

    The motor cables for the blackToe are as follows:

    Total 30 feet

    X - 9
    Y - 10
    Z - 11

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    WHAT ARE THE CABLE LENGTHS FOR BLACKTOE

  • WHERE ARE THE ELECTRONICS WIRING VIDEOS?

    The blackFoot CNC machine kit does not include a table. The table can be made as long or shot as you need. for instance, if you are looking for a travel of 4 fet x 4 feet, then the table will need to be about 6 feet long to get the full 4 feet of travel.

    The electronics are very straight forward using the connection diagram for the breakout board that you select. Use the videos for a general idea and then use the connection diagram to verify the correct connections for the interface of your choosing.

    Yes,the USB interface replaces the breakout board, but remember that you will need to use the planet-cnc software with the USB interface.

    Additional Information:
    The electronics does accompany the cnc machine kits as long as you select the option "with electronics". There are option to purchase the machines without electronics and that would be necessary if you either have your own electronics, or you prefer the plug and play cnc computer system we call the redLeaf, or redSprout. This will also be necessary if you prefer the electronics that use the USB interface rather than the parallel interface.

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    WHERE ARE THE ELECTRONICS WIRING VIDEOS?

  • WHERE ARE THE ELECTRONICS WIRING VIDEOS?

    The electronics and wiring videos are located under the tutorials section (click Tutorials on the top menu. The Title is "CNC Electronics and Wiring". The actual link to these videos is: https://www.buildyourcnc.com/CNCElectronicsandWiring.aspx

    Additional Information:
    You will also find the electronic wiring videos for the USB controller at: https://www.buildyourcnc.com/tutorials/tutorial-Electronics-USB-Interface-Wiring

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    WHERE ARE THE ELECTRONICS WIRING VIDEOS?

  • THESE MACHINES ARE DANGEROUS, WHAT DO DO?

    These machines are inherently dangerous. Before the machine moves, the machine should be clear of any person by a dimension of at the distance of a persons reach plus a few more feet. This is the policies we institute in our shop and what is recommend to all of our customers. Treat these machines as you would treat any major power tool in the shop.

    With that said, you can certainly add some protective parts, but still keep folks away even with those installed. I would use the gantry side to do all of the mounting of the protective parts. Consider using sheet metal that you can bend and make a simple installation right on the gantry side.

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    THESE MACHINES ARE DANGEROUS, WHAT DO DO?

  • MY LIMIT SWITCHES ARE TRIGGERING AT RANDOM.

    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. The customer can also try moving the cables as far away as possible from the motor wires and motors.

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    MY LIMIT SWITCHES ARE TRIGGERING AT RANDOM.

  • AND WHAT SIZES ARE THE PACKAGES OF MACHINE.

    the package sizes will be listed in your shopping cart, in the item detail. The site will also fully calculate shipping charges directly from the carrier, for each package you purchase.

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    AND WHAT SIZES ARE THE PACKAGES OF MACHINE.

  • WHAT CABLE LENGTHS ARE USED FOR THE BLACKTOE

    The motor cables for the blackToe are as follows:

    Total 30 feet

    X - 9
    Y - 10
    Z - 11

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    Click the link to add information to this solution:
    WHAT CABLE LENGTHS ARE USED FOR THE BLACKTOE

  • WHAT ARE THE BLACKTOOTH SHIPPING DIMENSIONS?

    The blacktooth ships in 3 boxes.

    Structure 38x22x5 #54

    Components 14x13x13 #30

    Laser Tube 35x7x6 #4

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    WHAT ARE THE BLACKTOOTH SHIPPING DIMENSIONS?

  • WHAT ARE THE DIMENSIONS FOR GREENBULL TABLE?

    Actual table dimension: 4'x8' is 56.078"x 121.50" (the overhang in the illustrations should be 3/4" thick)
    To determine the frame dimensions, first consider using the frame height shown of almost 3' (2.86'). The width of the frame should be 4" narrower than the dimension from rail edge to rail edge (6X rail to rail is 80.078"). This will provide a 2" overhang on both sides (4X frame width should be 56.078").
    The length of the frame should be 4" shorter than the desired length of the rails to provide a 2" overhang on both ends. The travel length will be 20" shorter than the rail length due to the space occupied by the gantry sides.
    Two long pieces of 3/4" material will need to be placed on top of the frame with the 2" overhang on the sides and the end. These long strips of material will receive the rails and the chain mounts on the ends.


    Link:
    https://www.buildyourcnc.com/Item/cnc-machine-greenBull-v4-4X

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    WHAT ARE THE DIMENSIONS FOR GREENBULL TABLE?

  • 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?

  • WHAT ARE THE SHIPPING DIMENSIONS FOR GREENBULL?

    76" X 40" X 26"
    230 LBS

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    WHAT ARE THE SHIPPING DIMENSIONS FOR GREENBULL?

  • WHICH TRAVELERS ARE RECOMMENDED TO BE VACCINATED?

    Healthcare providers should vaccinate any person who failed to get vaccinated in the previous vaccination season and who wants to reduce their risk of acquiring influenza during their upcoming travel, particularly if they are at high risk for influenza-related complications. This includes persons who are traveling to the tropics, traveling with organized tourist groups at any time of year, or traveling to the Southern Hemisphere during April-September.

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    WHICH TRAVELERS ARE RECOMMENDED TO BE VACCINATED?

  • WHAT ARE THE ROLLER CHAIN LENGTHS FOR GREENBULL 4X

    The roller chain lengths for the greenBull 4x is:
    - 13 feet for each side of the X axis (total of 26 feet), and
    - 6 feet for the Y-axis

    Click the link to add information to this solution:
    WHAT ARE THE ROLLER CHAIN LENGTHS FOR GREENBULL 4X

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