Comments on: Measure The Invisible

By: Bill

Bill — Mon, 02 Feb 2009 15:55:43 +0000

It’s possible we’re missing the boat here. The Physician may be saying you shouldn;t work with ANY power equipment, including driving, because of his general cardiac condition. It may be he’s had episodes of fainting etc that necessitated the pacemaker. It may be an implanted defibrillator not a pacemaker, when those things fire the patient tends to get a big enough jolt that they dont want to be near spinning sharp potential implements of destruction when they do fire.

By: The Android Site

The Android Site — Mon, 02 Feb 2009 11:19:40 +0000

Throw in a Geiger counter and this would be awesome.

By: What Wood Working Tools Do I Need |

What Wood Working Tools Do I Need | — Mon, 02 Feb 2009 05:22:59 +0000

[...] Toolmonger » Blog Archive » Measure The Invisible I think I’d take the buck thirty buy some more tools… Read more… [...]

By: Chris

Chris — Mon, 02 Feb 2009 00:07:43 +0000

Not to mention alot of switching devices like thyristors (think of the TRIAC in your light dimmer) create a lot of rf especially if set to turn off at the “right” part of the sine wave ( the dimming effect is caused by the device conducting for only part of the cycle).

By: Chris

Chris — Mon, 02 Feb 2009 00:04:19 +0000

I just had to wade into this as a certified engineering technologist (electronics), its doubtful the good doctor is doing snything more than a bit of CYA. Of course I live in Canada and I assume this guy was posting from the US so I cant somment on what its like where he is as far as the medical comunity goes. Having said that , it seems odd that such attention was given to motors. I wonder if this guy has an electric stove as its way worse than any motor for spewing out electromagnetic fields, also these fields diminish in strength by the square of the distance (ie twice as far results in one quarter the strength).

By: Zathrus

Zathrus — Sun, 01 Feb 2009 12:46:22 +0000

@CN:

Microwave radiation isn’t the issue here — it’s concern about the magnetic field. Any microwave radiation that would be strong enough to affect a pacemaker would also cook your heart/lungs/other body parts.

@Leaf:

That cabinet maker doesn’t know the first thing about magnetic fields. That’s really all there is to it.

Really agree with the others here — I doubt there would be enough of a field to be problematic unless something is seriously messed up.

By: Keith

Keith — Sat, 31 Jan 2009 17:21:34 +0000

I agree with the other posters in that I wouldn’t expect the amount of
magnetic leakage from most modern shop machine motors to be a problem
for a decently designed and installed pacemaker.

Magnetic leakage from a motor means a loss of efficiency, so I would
expect most of the magnetic flux to be kept within the iron of the motor.

Also, if the equipment is properly wired (all phases, neutral and ground
run to a piece of equipment in the same cable) and properly grounded,
the fields resulting from the power feed to the equipment while it is
operating should be minimized.

The exceptions to these statements would be any sort of arc welding, or
perhaps some older equipment containing an old AC/DC universal motor.

The old AC/DC universal motors were really DC motors (with brushes and
a commutator) with the brush angle set at a compromise between that
needed for DC and that needed for AC.

Those universal motors tend to produce a higher amount of arcing then do
other types of motors, such as a pure DC motor or an AC induction motor.

If you’re just interested on looking around for electric, magnetic, or
electromagnetic (RF) fields, here’s a less expensive (but not as
precisely calibrated) alternative to AlphaLab’s unit - if you’re up to
doing some soldering and assembly work:

Ramsey Electronics TFM3C - Tri-Field Meter Kit
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=TFM3C

Ramsey offers the kit for $64.95 plus shipping and handling.

By: paganwonder

paganwonder — Sat, 31 Jan 2009 15:56:15 +0000

Physician insurance companies have more to do with healthcare advice and choices than science does. The insurance company tells your physician what advice and guidance give you, and insurance companies take absolutely NO chances. I will do my own research thank you.

By: Leaf

Leaf — Sat, 31 Jan 2009 08:49:30 +0000

sort of related to this, a cabinet maker told me he didn’t like using the rare earth magnets for catches and stuff because they could interfere with pacemakers. Sounds kind of far fetched to me but I don’t really know anything about pacemakers.

By: Stan

Stan — Sat, 31 Jan 2009 07:01:05 +0000

I think I’d take the buck thirty buy some more tools, and get a 2nd opinion from a Dr. that knows something about Woodworking tools.
I can’t imagine a single WW tool that could put out a big enough EMF to interfere with a pacemaker.

By: CN

CN — Fri, 30 Jan 2009 20:53:25 +0000

Funny, I just ran across an article today from the Health Physics Society, a group “whose members specialize in occupational and environmental radiation safety.”

http://www.hps.org/hpspublications/articles/microwaveoven.html

It says that microwave “leakage is not considered to be a realistic concern” for pacemaker users unless the microwave case is actually damaged. It also gives the maximum allowed radiation the US FDA allows outside a microwave ( 5 mW cm^(–2) at 5 cm), in case the woodworker catches this article, and wants to compare his workshop’s radiation to that of his microwave!

By: Dave

Dave — Fri, 30 Jan 2009 20:07:01 +0000

I’m pretty sure there would be no issue whatsoever with being near electric motors. Maybe one from 1930 or so might have a bit of a magnetic field leak…

They are not even sure if arc welding would cause an issue (radio emissions and magnetic emissions from that).

Dave