Home |
Search |
Today's Posts |
|
Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
Wasn't it you that did all the research on the effects of welding and
magnetic field effects on a defib device ? A good friend of a good friend has a defib , and is unsure about how safe it is to mig and stick weld . I told him I'd seen some posts here and would try to dig the info up . Poor SOB was out in his shop a month ago when three (really !!) trees landed on it during a storm . I was over there helping my friend (Bill the Machinist) clear the shop out so it can be repaired , and his yard is a putterer's wet dream . -- Snag "90 FLHTCU "Strider" '39 WLDD "PopCycle" BS 132/SENS/DOF |
#2
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On Sun, 23 May 2010 20:01:02 -0500, "Snag"
wrote: Wasn't it you that did all the research on the effects of welding and magnetic field effects on a defib device ? A good friend of a good friend has a defib , and is unsure about how safe it is to mig and stick weld . I told him I'd seen some posts here and would try to dig the info up . Poor SOB was out in his shop a month ago when three (really !!) trees landed on it during a storm . I was over there helping my friend (Bill the Machinist) clear the shop out so it can be repaired , and his yard is a putterer's wet dream . T'was I. What I did was learn from the mfr of the ICD what their spec limits were for magnetic fields and electric fields. They a E field 50-60 Hz (AC) 1000V/m - 4000V/m B field DC (static) 1 mT B field 50-60 Hz (AC) 0.1 mT I then did my own "site survey" by measuring the fields in the region of my torso (before implant) while welding. I made the instrumention I used to accomplish this except for a digital recording oscilloscope I borrowed from a friend. I can't say what might be safe for someone else because equipment and welding practices may be very different. I did find that lead dress was quite helpful in minimizing magnetic field strengths. I keep the stinger cable as close as possible to the ground as much as possible (even twist them) and I'm diligent about not having the stinger cable form a loop near me. I'm confident about stick and MIG, but I haven't tried TIG yet. The electric fields approached the limits. They're easy to shield against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. I actually think there wouldn't be a problem because the HV in a TIG is also HF which wouldn't penetrate very far into the body. In fact, that's exactly why they use HF. |
#3
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
In article ,
Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought |
#4
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
Don Foreman wrote:
On Sun, 23 May 2010 20:01:02 -0500, "Snag" wrote: Wasn't it you that did all the research on the effects of welding and magnetic field effects on a defib device ? A good friend of a good friend has a defib , and is unsure about how safe it is to mig and stick weld . I told him I'd seen some posts here and would try to dig the info up . Poor SOB was out in his shop a month ago when three (really !!) trees landed on it during a storm . I was over there helping my friend (Bill the Machinist) clear the shop out so it can be repaired , and his yard is a putterer's wet dream . T'was I. What I did was learn from the mfr of the ICD what their spec limits were for magnetic fields and electric fields. They a E field 50-60 Hz (AC) 1000V/m - 4000V/m B field DC (static) 1 mT B field 50-60 Hz (AC) 0.1 mT I then did my own "site survey" by measuring the fields in the region of my torso (before implant) while welding. I made the instrumention I used to accomplish this except for a digital recording oscilloscope I borrowed from a friend. I can't say what might be safe for someone else because equipment and welding practices may be very different. I did find that lead dress was quite helpful in minimizing magnetic field strengths. I keep the stinger cable as close as possible to the ground as much as possible (even twist them) and I'm diligent about not having the stinger cable form a loop near me. I'm confident about stick and MIG, but I haven't tried TIG yet. The electric fields approached the limits. They're easy to shield against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. I actually think there wouldn't be a problem because the HV in a TIG is also HF which wouldn't penetrate very far into the body. In fact, that's exactly why they use HF. Thanks Don , I will forward this info to Larry . -- Snag "90 FLHTCU "Strider" '39 WLDD "PopCycle" BS 132/SENS/DOF |
#5
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On Mon, 24 May 2010 07:15:41 -0400, John Husvar
wrote: In article , Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought Excellent lead! Fencing scoring lame is quite expensive, but investigating that lead me to http://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. Thanks! |
#6
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
Fencing scoring lame is quite expensive, but investigating that lead me to http://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. There's a nice little business opportunity. Make up a few dozen RF welding aprons complete with a certified study of how well it works and start marketing them. Just do eBay, Craig's list and a couple newsgroups for your advertising Karl |
#7
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On May 24, 8:34*am, Don Foreman wrote:
On Mon, 24 May 2010 07:15:41 -0400, John Husvar wrote: In article , Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. * How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought Excellent lead! * Fencing scoring lame is quite expensive, but investigating that lead me tohttp://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. Thanks! Wow! What a fascinating web site! I had no idea such material was possible. Thanks, Paul |
#8
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On Mon, 24 May 2010 10:34:21 -0500, Don Foreman
wrote: On Mon, 24 May 2010 07:15:41 -0400, John Husvar wrote: In article , Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought Excellent lead! Fencing scoring lame is quite expensive, but investigating that lead me to http://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. Thanks! These guys even have ready-made EMI garments! Scroll down to the tee shirt at http://www.lessemf.com/personal.html The primary concern with stick and MIG welding is magnetic field, which this would not be effective against. It will provide good protection against the HF E-fields of TIG using spark-start. Shielding against low-frequency (50-60Hz) and DC magnetic fields is not practical short of a fairly heavy mu-metal breastplate. Mu metal is very expensive, and if shaped or worked it must then be hydrogen-annealed to restore its magnetic properties. The best way to deal with magnetic fields is to minimize the fields in the first place. With care, welding currents of up to 200 amps are possible. I would say that spot welding is not possible for a person with an ICD. I wouldn't get within 20 feet of a spot welder. |
#9
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On Mon, 24 May 2010 10:34:21 -0500, Don Foreman
wrote: On Mon, 24 May 2010 07:15:41 -0400, John Husvar wrote: In article , Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought Excellent lead! Fencing scoring lame is quite expensive, but investigating that lead me to http://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. Thanks! From the same link...rather fascinating when thought upon.... http://www.liebertonline.com/doi/abs...cm.2004.10.767 Gunner -- "First Law of Leftist Debate The more you present a leftist with factual evidence that is counter to his preconceived world view and the more difficult it becomes for him to refute it without losing face the chance of him calling you a racist, bigot, homophobe approaches infinity. This is despite the thread you are in having not mentioned race or sexual preference in any way that is relevant to the subject." Grey Ghost |
#10
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On 2010-05-24, Don Foreman wrote:
On Mon, 24 May 2010 10:34:21 -0500, Don Foreman wrote: On Mon, 24 May 2010 07:15:41 -0400, John Husvar wrote: In article , Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought Excellent lead! Fencing scoring lame is quite expensive, but investigating that lead me to http://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. Thanks! These guys even have ready-made EMI garments! Scroll down to the tee shirt at http://www.lessemf.com/personal.html Hmm ... Perhaps EMI resistant yarmulkes for those who spend a lot of time on cell phones and are worried about brain cancer form the RFI? Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#11
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On 25 May 2010 03:09:56 GMT, "DoN. Nichols"
wrote: On 2010-05-24, Don Foreman wrote: On Mon, 24 May 2010 10:34:21 -0500, Don Foreman wrote: On Mon, 24 May 2010 07:15:41 -0400, John Husvar wrote: In article , Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought Excellent lead! Fencing scoring lame is quite expensive, but investigating that lead me to http://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. Thanks! These guys even have ready-made EMI garments! Scroll down to the tee shirt at http://www.lessemf.com/personal.html Hmm ... Perhaps EMI resistant yarmulkes for those who spend a lot of time on cell phones and are worried about brain cancer form the RFI? This vendor does offer balaclava shields. Catalog #A219, $59.95. They are most effective in brain cancer risk reduction if used while jabbering into the cellphone at an airport in a tongue other than English or Spanish. |
#12
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
Larry Jaques wrote: On Mon, 24 May 2010 09:10:04 -0700 (PDT), " wrote the following: On May 24, 8:34 am, Don Foreman wrote: On Mon, 24 May 2010 07:15:41 -0400, John Husvar wrote: In article , Don Foreman wrote: against, I just haven't gotten around to making a shielding garment -- as perhaps a vest with Litz wire sewn into it. How about a fencing scoring lame' (Metalized vest for foil/jacket for saber) and ground it? Wear it under your leathers. Just a thought Excellent lead! Fencing scoring lame is quite expensive, but investigating that lead me tohttp://www.lessemf.com/fabric.html where I found quite a few possibilities at very reasonable cost. Thanks! Wow! What a fascinating web site! I had no idea such material was possible. Now we can make _comfortable_ tinfoil hats that aliens waves can't penetrate! That was last millenium's model. The new ones are underground, and aimed straight up. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge. |
#13
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On Mon, 24 May 2010 23:41:07 -0500, Don Foreman
wrote: This vendor does offer balaclava shields. Catalog #A219, $59.95. They are most effective in brain cancer risk reduction if used while jabbering into the cellphone at an airport in a tongue other than English or Spanish. Could increase the risk of lead poisoning though :-( Mark Rand RTFM |
#14
Posted to rec.crafts.metalworking
|
|||
|
|||
PING Don Foreman
On Fri, 28 May 2010 23:38:04 +0100, Mark Rand
wrote: On Mon, 24 May 2010 23:41:07 -0500, Don Foreman wrote: This vendor does offer balaclava shields. Catalog #A219, $59.95. They are most effective in brain cancer risk reduction if used while jabbering into the cellphone at an airport in a tongue other than English or Spanish. Could increase the risk of lead poisoning though :-( Mark Rand RTFM That's how they reduce the risk of brain cancer! :) BTW, Mark, my UK rellies (daughter, SIL and granddaughter) will visit this summer. SIL is a born and raised Londoner. Last visit, at a time when I was just getting interested in shooting handguns, Hassan couldn't get enough gunsmoke. Took two range visits to sate his appetite. I'd previously taught him to shoot a scoped air rifle (Webley) from the window of his London flat to bust magpies (legal in London) and he found that he enjoyed the challenge of marksmanship. My collection has grown significantly since then, and he'll be here during summertime this visit so we can shoot outdoors at reactive targets like water bottles that flat explode when hit. We are gunna have us a bang-up good time! |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Ping Don Foreman: ICD Alert | Metalworking | |||
Did a little Don Foreman style project today | Metalworking | |||
Pinging Don Foreman - Bicycle Light | Metalworking | |||
Treadmill motor controller question. (Don Foreman, Wayne Cook?) | Metalworking | |||
George Foreman grill repair | UK diy |