Headsets have been tested by the manufacturers and meet the current ANSI/IEEE standards for RF safety, the same standards that the Federal Communications Commission enforces under the Telecommunications Act of 1996. These standards place limits on the specific absorption rate (SAR) of radiofrequency (RF) energy in the body. Recent inflamatory articles in British press were not substantiated by testing in ISO-accredited testing facilities at Motorola. Manufacturers of cellular 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 may be available from the FDA or from the FCC. Ron Petersen, Lucent C.K. Chou, Motorola

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HAVE THERE BEEN ANY STUDIES OF POSSIBLE RADIATION DANGER FROM HEADSETS USED WITH HANDSETS CORDED TELEPHONES? I A TELEPHONE BATTERY-POWERED HANDSET. THIS HANDSET HAS JACK FOR HEADSET, SO YOU CAN WALK AROUND THE HOUSE AND YARD ON YOUR BELT WHILE TALK INTO HEADSET. EITHER OR HEADSET GIVING OFF RADIATION, LIKE CELLULAR PHONE? DANGEROUS AMOUNT RADIATION?

If you have the laser firing using the Z direction, then you want to make sure that the thickness and clearance plane is extremely small. The time it takes for the software to think that the z axis has lowered to the depth set in the design is causing the laser to stay on in a single position for too long. Make sure that the depth is extremely small, like .0001" or the smallest amount allowed by the Vectric software. Also, make sure the clearance plane (the height that the z axis would raise to clear any protrusions like clamps and the such) is extremely low.

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I have been using a Blacktooth for some time, with Vectric2d and Mach3. I have always found that the laser burns a hole before moving off. I have always set material thickness at actual value. Should it be set very low? Also, of the many post processors supplied with 2d, which is best for Blacktooth?

Can you check if there are cracks in the inner glass tube? Also, check to see if there is water between the inner glass tube and the outer glass tube. That will give you an indication of cracking in the inner glass tube.

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I was in the process of aligning mirrors for our vertical XL and suddenly the laser does not fire anymore, there is an arcing sound and a light near the Anode (positive) connector of the tube on the very inside. Do you think the laser tube would go bad so quickly? how could we avoid this?

It is not clear that mobile phones do produce brain tumors, or any serious health effects for that matter. A number of epidemiology studies have been almost completely negative on the issue.

See the article I wrote with John Moulder in IEEE Spectrum magazine and also Moulder's FAQ on mobile phones and health.

There has been a lot of discussion over the years about the possible mechanisms by which microwave energy such as emitted by cell phones might produce biological effects. The one unequivocal mechanism is the heating of tissue, but mobile phones operate at power levels that are too low to cause noticeable heating in the user. Scientists have speculated about other mechanisms, but these theories remain unproven and many of them have been challenged on biophysical grounds.

Whatever may be the risks or nonrisks of mobile phone radiation, a hands-free kit is an effective way for the user to reduce his or her exposure to radiofrequency energy while using a mobile phone.

Kenneth R. Foster, Professor
Department of Bioengineering
University of Pennsylvania

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I WOULD LIKE TO INQUIRE ABOUT THE PHYSICS PRINCIPLES REGARDING USE OF MOBILE PHONES AND DEVELOPMENT BRAIN TUMORS. I'VE BEEN THROUGH MANY SITES BUT THEY CAN NEVER GIVE AN EXACT ANSWER. REALLY SOMEONE TUMORS OR DOES IT HAVE DO WITH INTENSITY RADIATION DISTANCE BETWEEN PHONE INDIVIDUAL?

The Mach3 USB interface board requires 24V relays externally. There are no relays on the mach3 usb board. If you use an external relay on the mach3 usb board, the relay connects to the V+ which is 24V and the output pin is the return.

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I understand what you are saying. Does your relay board work with the Mach3 USB board? If not, what relay board do you suggest to work with this usb controller?

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Our relay board works with our parallel breakout board. An off the shelf SSR (Solid State Relay) made for 24V should work fine.

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I bought a 'BuildyourCNC V1' relay board to go with my mach3 usb controller. I have been sent a 'Songle' relay. It's not the one in your picture and it's got different connections, for which there isn't a wiring diagram. The one I ordered says it is 5v, this one seems to be saying it's a 24v unit. Can you please explain what has happened? Thanks

The Mach3 USB interface board requires 24V relays externally. There are no relays on the mach3 usb board. If you use an external relay on the mach3 usb board, the relay connects to the V+ which is 24V and the output pin is the return.

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I understand what you are saying. Does your relay board work with the Mach3 USB board? If not, what relay board do you suggest to work with this usb controller?

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Our relay board works with our parallel breakout board. An off the shelf SSR (Solid State Relay) made for 24V should work fine.

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I bought a 'BuildyourCNC V1' relay board to go with my mach3 usb controller. I have been sent a 'Songle' relay. It's not the one in your picture and it's got different connections, for which there isn't a wiring diagram. The one I ordered says it is 5v, this one seems to be saying it's a 24v unit. Can you please explain what has happened? Thanks

The fact that you cannot move the motors with the keyboard serves as a clue to a couple possibilities.

- The software may not be communicating with parallel port. (One possibility may be that your step pins are not low active, or vice versa depending on your drivers).
- You may not be in the correct tab of Mach3. Make sure you are in the Program Run tab.
- The jog on/off button on the program run screen may not be lit (invoked).

This address below shows the complete troubleshooting for this type of situation. It will show how to test each pin at the parallel port at the back of the computer and everything else associated with correctly wiring the electronics.

https://buildyourcnc.com/CNCElectronicsandWiring.aspx




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6 axis robot with Mach3 Card 6 Axis Motion Controller

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I have a home built CNC running Mach 3. I have power to all the motors and the breakout board but no movement when running g-code. I cannot even manually move the motors with the arrow keys or page up and down. It also has an integrated 120v receptacle showing an open ground. I don't know if all this is related.

Dealing with a 4' x 12' machine, our blackFoot kit will be your best option. Since our machines are only limited to the width but not length wise, you can add however much extra rail and roller chain to accommodate your extended length. Now adding our 4th axis kit (https://www.buildyourcnc.com/item/axes-4th) will be needed for your 4th axis (unless custom design is required).

These items will be the best requirements to build a 4' x 12' 4th axis machine.
Machine (either parallel/USB BoB): https://www.buildyourcnc.com/blackFoot48v40.aspx
4th axis: https://www.buildyourcnc.com/item/axes-4th

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Hi, I am very interested in this CNC Router unit [4'x8'], but from South Africa with our exchange rat [1$ =13,4 ZAR presently, make these kits out of reach. The plans part has been discontinued, but in our situation, would you reconsider and supply full plans and instructions at a cost? please let me know.

We are toying with the idea of re-introducing plans for some of our machines. Please give us a call to discuss further.

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Hi, I am very interested in this CNC Router unit [4'x8'], but from South Africa with our exchange rat [1$ =13,4 ZAR presently, make these kits out of reach. The plans part has been discontinued, but in our situation, would you reconsider and supply full plans and instructions at a cost? please let me know.

Pulsed radiation fields are encountered in the vicinity of electron Linacs (McCall and Ipe 1988). Most therapy Linacs are operated at repetition rates varying from 100 to 400 pulses per second with pulse widths of about 1 to 10 microseconds (AAPM 1986). The fraction of operating time (that is, pulse width x repetition rate) during which the beam is on is called the duty factor. For example, the duty factor for an electron Linac operating at 100 pulses per second with a pulse width of 10 µs is 0.001. These small duty factors impose severe limitations on the radiation detection instruments. The peak intensity is equal to the average intensity divided by the duty factor, which in this case will be 1,000 times higher than the average intensity. An instrument that normally responds well to the average dose rate spread out evenly in time will not be able to cope with such a high dose rate. The intense photon pulse usually overwhelms any active detector (that detects particle events electronically). Instruments which have long dead times, such as the GM and proportional counters, tend to become saturated in such fields and only count the repetition rate. Thus GM counters should not be used to perform radiation surveys outside exterior walls of the Linac room. Scintillation survey meters may become nonlinear at higher dose rates because photomultipliers cannot handle the high instantaneous currents.Ionization chambers are less influenced; however they must be operated with adequate voltage to overcome recombination losses. There are several commercially available ionization chambers that can be used for Linac radiation surveys

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THE ROOM HAS THICK CONCRETE WALLS PLUS LEAD SHEETS. LEVELS OF EXPOSURE I AM GETTING WITH LUDLUM MODEL 3 SURVEY METER (SM) A 44-9 PROBE ARE BETWEEN 0.1-3 MR/H IN WORST CASE (HIGHER ENERGY AND POINTING BEAM TO WALL). SM WAS CALIBRATED 137CS MY NOMINAL 18 MV (MEAN ~5 MV). WHAT KIND INSTRUMENT MORE ADEQUATE USE FOR THIS TYPE BETTER RESPONSE?

To verify, you are still getting the laser tube to fire, but the laser beam is weak and cannot cut or engrave any materials correct?

Have you checked your tube's tungsten post terminals to make sure they are getting good contact?
The Laser tube and laser power supply both have manufacture warranty, please email customerservice@buildyourcnc.com for further assistance.

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Hello, I have a blacktooth laser cutter, the machine has 10hrs of work, suddenly in the middle of a job the laser beam lost all power, I can still se the purple plasma beam but with no power or intensity, the tube is fine, water is running through and there is no arcing to the chasis or some other part. I think it might be a faulty PS how can I test it, Do I have a warranty on it?

The files and hardware option for our machines has been removed from the site due to the following reasons:
Difficulty for the end use of the files and the challenges (and time/money) on our side to assist in using these files.
The abuse of these files over the internet.
Ultimately may reduce the sales of machines keeping us in business.
Sadly, this is what has come out of our company attempting to be open; however, the machines sold on this site is still far lower in price than the competition for the quality that we provide as we have a great desire to engender the cottage industry to fulfill their need for low end manufacturing. My sincere apologies if this causes any inconvenience.

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NO, is not possible, I can help with the shipping cost

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Is it possible to buy just the electronics and hardware for the bigfoot along with the plans for the timber components so that I could have them cut here in the UK and reduce the amount of material that needs to be shipped?

See the question on our "Ask the Expert" question-and-answer list on cellular towers under nonionizing radiation for a discussion of RF safety issues associated with cellular radios. The technology underlying cellular radios and base station antennas is similar around the world, but there are differences in systems design and RF safety limits in different countries. For a summary of cellular radio RF safety issues with attention to international differences see the excellent Web page, Cellular Phone Antennas (Base Stations) and Human Health, by John E. Molder, Ph.D., from the Medical College of Wisconsin. Gary H. Zeman Sc.D., CHP

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I LIVE IN ITALY AND WISH TO KNOW MORE ABOUT RADIATIONS CAUSED FROM MOBILE TELEPHONES. TELECOM WOULD LIKE PLACE A WIRE-ANTENNA THE HEARTH OF MY TOWN, I'M AFRAID IT. WHICH KIND RISK HEALTH COULD IT CAUSE? THANK YOU IF WILL SEND ME SOME INFORMATION SCIENTIFIC ARTICLES THIS PROBLEM!

it is possible to install 2 motors on a single axis but you will require another driver and motor, but wire it directly to the same pins on your breakout board. Also the orientation of your motor since it is opposite side of the original so getting it to move accordingly to the original motor it will need to be orientated correctly. The slight shift could be the cause of the rod not being completely flat where the set screws are suppose to tighten the sprocket to the rod, so sanding it to a flatter surface might fix the shift in directions.
Currently do not have a kit or schematic available.

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Hello, I have a BlackToe 2 x 4 machine. I was wondering if it could be beneficial, or even possible to install two motors on the x-axis (one one each chain drive sprocket). I am noticing a slight shift in the gantry with each reversal of direction. If so, do you have a kit or schematic for this? Thanks

From time to time we change providers of components for various reasons. I just spoke to our assembler and electronics employee to determine if he witnessed the same issues. He said they work, but are not as easy to use as the previous terminal block. We will make sure not to use this provider anymore and will search for a better quality terminal block.


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Boom thats the answer. Your quick and thorough response and dedication to correcting the problem is why i choose to do business with you and encourage others to do the same!

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Thank you for that kind response!

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2.5A small stepper driver I received has blue connection blocks instead of green like on the last three I got. wow what a difference in ease of wiring with the green blocks. Please i don't know what the savings are but it's not worth it unless the price can be dropped as well. the green blocks have a "chute" style guide for each wire which keeps it under the metal tab while tightening.

Yes, if the power supplies were supplied by us, we will exchange them with 110v equivalent power supplies.

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Hello, I am a student working on a CO2 laser. We recently ordered two 40watt CO2 laser tubes and two 40 Watt CO2 Laser Tube Power Supply at 220V. However, our school is unable to use them due to being 220v. Is it possible to exchange these for the 110v supply, or is there a way we can go about connecting it at 110v instead of 220v? Thank you.

The mirrors can be aligned using the two positioning screws on the mirror itself.

Here are some videos to help:
Part 1:

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Troubleshooting Blacktooth alignment issues. In the center position, all is aligned. Moving the nozzle to the positive or negative side and you can see it steadily moves to the top left or bottom right of the hole. Adjusting the mirrors does not resolve. Is this a problem with the build itself? Here's a video of what's happening. https://www.youtube.com/watch?v=av7dxyfaJc4

I have not hear of this. This cold be an issue with using later firmware, but I have not come across having to cut the trace for the reset enable on the Arduino board.

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Have you heard of the requirement to cut the Reset Enable trace on the Aruduino Mega for a Makerbot Thing-o-matic? Does this apply to the whiteAnt 3d printer? The trace on my Arduino board is definitely connected and I am experiencing issues with connectivity. Please advise.

Yes, you can contact me at customerservice@buildyourcnc.com to get the full BOM for that machine.

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I have a green lean machine that I acquired from a friend that had to move cross country and could not take the machine with him. It was partially disassembled and stored in his garage. Unfortunately, he lost a couple of parts I cannot easily replicate. Is there a parts list anywhere for this machine so that I can order replacements?