On Sunday, November 22, 2015 at 2:28:54 AM UTC-5, Jan Panteltje wrote:> > Ultrasonic drilling: > http://www.imajeenyus.com/workshop/20110516_ultrasonic_drilling/index.shtmlNice, thanks. Cheers, James Arthur
Steel melter for forty bucks? Needs a KW dc supply. Also $1 100nS 30KV! Also ALSO!
Started by ●November 21, 2015
Reply by ●November 22, 20152015-11-22
Reply by ●November 22, 20152015-11-22
On a sunny day (Sun, 22 Nov 2015 11:34:45 -0800 (PST)) it happened Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in <e467ce19-9d97-475a-a03d-4d4dfe947699@googlegroups.com>:>> http://www.ebay.com/itm/1000W-12-48V-20A-ZVS-High-Frequency-Low-Voltage-= >Induction-Heating-Board-Module-/361287263867?hash=item541e66267b:g:YpoAAO= >Swqu9VRs2H&autorefresh=true >> > >yeh, if it doesn't start it is a dead short > >> >> I may perhaps order one... >> Just to bake fish on the ocean and recharge via solar panel. > >the schematic is very simple, you can probably find most of the parts >in your pile of partsOrdered one... Did not have the MOSFETs and caps... What I do not quite understand is that the solder pot guy uses a carbon container, and heats that up. is that not wasting energy? I would use a glass or some other non-reacting container and the 150 kHz RF will melt the solder by itself?
Reply by ●November 22, 20152015-11-22
Den s�ndag den 22. november 2015 kl. 21.34.27 UTC+1 skrev Jan Panteltje:> On a sunny day (Sun, 22 Nov 2015 11:34:45 -0800 (PST)) it happened Lasse > Langwadt Christensen <langwadt@fonz.dk> wrote in > <e467ce19-9d97-475a-a03d-4d4dfe947699@googlegroups.com>: > > >> http://www.ebay.com/itm/1000W-12-48V-20A-ZVS-High-Frequency-Low-Voltage-= > >Induction-Heating-Board-Module-/361287263867?hash=item541e66267b:g:YpoAAO= > >Swqu9VRs2H&autorefresh=true > >> > > > >yeh, if it doesn't start it is a dead short > > > >> > >> I may perhaps order one... > >> Just to bake fish on the ocean and recharge via solar panel. > > > >the schematic is very simple, you can probably find most of the parts > >in your pile of parts > > Ordered one... > Did not have the MOSFETs and caps... > > What I do not quite understand is that the solder pot guy uses a carbon container, and heats that up. > is that not wasting energy? > I would use a glass or some other non-reacting container and the 150 kHz RF will melt the solder by itself?it isn't carbon, it is fiberglass insulation normally used to wrap exhausts The container is a piece of iron pipe, induction heating works best with iron, I'm not even sure it will melt solder directly -Lasse
Reply by ●November 22, 20152015-11-22
On 11/22/2015 3:55 PM, Lasse Langwadt Christensen wrote:> Den s�ndag den 22. november 2015 kl. 21.34.27 UTC+1 skrev Jan Panteltje: >> On a sunny day (Sun, 22 Nov 2015 11:34:45 -0800 (PST)) it happened Lasse >> Langwadt Christensen <langwadt@fonz.dk> wrote in >> <e467ce19-9d97-475a-a03d-4d4dfe947699@googlegroups.com>: >> >>>> http://www.ebay.com/itm/1000W-12-48V-20A-ZVS-High-Frequency-Low-Voltage-= >>> Induction-Heating-Board-Module-/361287263867?hash=item541e66267b:g:YpoAAO= >>> Swqu9VRs2H&autorefresh=true >>>> >>> >>> yeh, if it doesn't start it is a dead short >>> >>>> >>>> I may perhaps order one... >>>> Just to bake fish on the ocean and recharge via solar panel. >>> >>> the schematic is very simple, you can probably find most of the parts >>> in your pile of parts >> >> Ordered one... >> Did not have the MOSFETs and caps... >> >> What I do not quite understand is that the solder pot guy uses a carbon container, and heats that up. >> is that not wasting energy? >> I would use a glass or some other non-reacting container and the 150 kHz RF will melt the solder by itself? > > it isn't carbon, it is fiberglass insulation normally used to wrap exhausts > > The container is a piece of iron pipe, induction heating works best with > iron, I'm not even sure it will melt solder directlyIn the video I saw, he switched the crucible to graphite, not an uncommon material for crucibles. Small pieces of anything are not easy to induce large currents in. The crucible is the right shape to get the maximum currents in while the raw stock is not. -- Rick
Reply by ●November 22, 20152015-11-22
"Jan Panteltje" wrote in message news:n2rqrg$pd3$1@news.datemas.de...> Oh that is way cool, now I can finally melt my Plutanium. > https://www.google.nl/search?q=molten+plutonium&biw=1670&bih=850&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjOh9r8vqPJAhVBvxoKHTcBBpEQsAQILw >Trivia: I designed and built a custom induction heater, which was sold to LANL, "definitely for not melting things". Nevermind that their "susceptor" was made of tantalum, with a hole in the bottom and a lever arm to plug it. :-) Not really sure what they'd be building, this day and age. Guessing they have to keep things fresh and rebuilt, from time to time, so that includes the practical side of handling such elements. Supposedly, plutonium is one of the most fascinating, rich, and challenging metals to handle, metallurgically speaking. Pure, it has something like five solid phases (between absolute zero and melting), huge expansion rates (several %) between transformations, and forms useful alloys with lots of elements. Gallium being the most common, which stabilizes one of the phases well enough so it can be cast and worked without fracturing into a million toxic pieces, or cracking the mold. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com
Reply by ●November 22, 20152015-11-22
"Lasse Langwadt Christensen" wrote in message news:e2a007d2-3a91-4db5-9e97-6c28079d6f48@googlegroups.com... Den s�ndag den 22. november 2015 kl. 21.34.27 UTC+1 skrev Jan Panteltje:> On a sunny day (Sun, 22 Nov 2015 11:34:45 -0800 (PST)) it happened Lasse > Langwadt Christensen <langwadt@fonz.dk> wrote in > <e467ce19-9d97-475a-a03d-4d4dfe947699@googlegroups.com>: > > >> > >> http://www.ebay.com/itm/1000W-12-48V-20A-ZVS-High-Frequency-Low-Voltage-= > >Induction-Heating-Board-Module-/361287263867?hash=item541e66267b:g:YpoAAO= > >Swqu9VRs2H&autorefresh=true > >> > > > >yeh, if it doesn't start it is a dead short > > > >> > >> I may perhaps order one... > >> Just to bake fish on the ocean and recharge via solar panel. > > > >the schematic is very simple, you can probably find most of the parts > >in your pile of parts > > Ordered one... > Did not have the MOSFETs and caps... > > What I do not quite understand is that the solder pot guy uses a carbon > container, and heats that up. > is that not wasting energy? > I would use a glass or some other non-reacting container and the 150 kHz > RF will melt the solder by itself?it isn't carbon, it is fiberglass insulation normally used to wrap exhausts The container is a piece of iron pipe, induction heating works best with iron, I'm not even sure it will melt solder directly -Lasse ======================================================================================= He used an iron pipe cap in the solder pot, but switched to carbon for melting aluminum. I'm sure he wouldn't waste a more expensive graphite crucible on a solder pot. Reading some of the ebay listings for zvs drivers, they mention that the crucible or work piece diameter should be less than 1/3 of the coil diameter to keep from overloading the driver, but in the ebay videos it looks to me like his solder pot and graphite crucible are over that, approaching 1/2 of the diameter. Is it just a matter of current limiting the dc supply, or is he risking the output transistors (or is my calibrated eye crooked :-))? ----- Regards, Carl Ijames
Reply by ●November 23, 20152015-11-23
On a sunny day (Sun, 22 Nov 2015 12:55:52 -0800 (PST)) it happened Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in <e2a007d2-3a91-4db5-9e97-6c28079d6f48@googlegroups.com>:>> >the schematic is very simple, you can probably find most of the parts >> >in your pile of parts >> >> Ordered one... >> Did not have the MOSFETs and caps... >> >> What I do not quite understand is that the solder pot guy uses a carbon c= >ontainer, and heats that up. >> is that not wasting energy? >> I would use a glass or some other non-reacting container and the 150 kHz = >RF will melt the solder by itself? > >it isn't carbon, it is fiberglass insulation normally used to wrap exhausts > >The container is a piece of iron pipe, induction heating works best with >iron, I'm not even sure it will melt solder directlyI dunno, it melts silly-con: http://link.springer.com/chapter/10.1007/978-3-540-32944-2_73#page-1 So currents are induced, and that heats it. My only Xperience with RF heating till now is this: In my 250 W 40 meter linear in the sixties (tube, 1kV) I tried a screwdriver in the tank coil, and it sure heated up. I also put (oops) a neon bulb in the tank coil, and then it lit up, after a few seconds it lit up REALLY bright. Too bright, I switched off, dreamt of lasers that night... My precious RF (rare at hat time) transistors in a metal cigar box next to it proved dead later, induced current? There it is, and that was so long ago. Cannot wait to try some other stuff, enrichment (uche) of Xperience so to speak.
Reply by ●November 23, 20152015-11-23
On a sunny day (Sun, 22 Nov 2015 15:26:56 -0600) it happened "Tim Williams" <tiwill@seventransistorlabs.com> wrote in <n2tbqq$9eb$1@dont-email.me>:>"Jan Panteltje" wrote in message news:n2rqrg$pd3$1@news.datemas.de... >> Oh that is way cool, now I can finally melt my Plutanium. >> >> https://www.google.nl/search?q=molten+plutonium&biw70&bih�0&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjOh9r8vqPJAhVBvxoKHTcBBpEQsAQILw >> > > >Trivia: I designed and built a custom induction heater, which was sold to >LANL, "definitely for not melting things". Nevermind that their >"susceptor" was made of tantalum, with a hole in the bottom and a lever >arm to plug it. :-) > >Not really sure what they'd be building, this day and age. Guessing they >have to keep things fresh and rebuilt, from time to time, so that includes >the practical side of handling such elements. > >Supposedly, plutonium is one of the most fascinating, rich, and >challenging metals to handle, metallurgically speaking. Pure, it has >something like five solid phases (between absolute zero and melting), huge >expansion rates (several %) between transformations, and forms useful >alloys with lots of elements. Gallium being the most common, which >stabilizes one of the phases well enough so it can be cast and worked >without fracturing into a million toxic pieces, or cracking the mold. > >TimYea, these days every kid has his own nuculear reactor I think. Mr Kim's hobby too. I think the Uranium in my Uranium marbles is not depleted, so in theory most isotopes should be there, I do not think there is enough conduction in those marbles (or any other Uranium glass) to get it to melt in that thing. But it would be different with Uranium ore. There is a slight weight difference between those isotopes, but separation seems difficult, ultra centrifuge hexafluoride in steps. OTOH I remember a story from somebody who started with radium from old clocks, and the stuff got so hot in the end it got out of hand, they had to decontaminate the neighborhood. Make your own RTG? I see many sites that gave details of this have been 'falsified' to give the wrong setups / info. That would not help against a gov determined to make a b*mb, but maybe against 10 year olds trying one. When I grew up US boasted so much about the bomb that the blueprints (the correct ones) were in every comic I tell you. So ;-) As a kid I went to an exhibition I think it was in Schiphol airport where they had everything from bubble chamber to those robotic arms manipulating the stuff. Radium in that time was used to light up light switches, watches... I am still alive, was not so dangerous after all? later I worked <censored> so and THOSE guys were careless, lots of contamination happened in that place. Scientists are _not_ careful, trust me (tm).
Reply by ●November 23, 20152015-11-23
On a sunny day (Sun, 22 Nov 2015 17:15:27 -0500) it happened "Carl Ijames" <carl.ijamesXyZZy@ZZxyz.verizon.net> wrote in <n2teqa010gh@news3.newsguy.com>:>> RF will melt the solder by itself? > >it isn't carbon, it is fiberglass insulation normally used to wrap exhausts > >The container is a piece of iron pipe, induction heating works best with >iron, I'm not even sure it will melt solder directly > >-Lasse >======================================================================================= > >He used an iron pipe cap in the solder pot, but switched to carbon for >melting aluminum. I'm sure he wouldn't waste a more expensive graphite >crucible on a solder pot. Reading some of the ebay listings for zvs >drivers, they mention that the crucible or work piece diameter should be >less than 1/3 of the coil diameter to keep from overloading the driver, but >in the ebay videos it looks to me like his solder pot and graphite crucible >are over that, approaching 1/2 of the diameter. Is it just a matter of >current limiting the dc supply, or is he risking the output transistors (or >is my calibrated eye crooked :-))?If you current limit then the voltage may drop below 12V and oscillation stops (the seller says). You can however do cycle by cycle current limit, and that is absolutely something i will add, small current transformer in supply line , trigger flipflop, cut power (series MOSFET). I do that in the ultrasonic driver the same way. In fact I will after some initial test probably drive it with the same PIC circuit. And probably report here (an other Xperiment).
Reply by ●November 23, 20152015-11-23
On 2015-11-21, Bill Beaty <billb@eskimo.com> wrote:> > The woods are full of these today: > > 1000W 12-48V 20A ZVS High Frequency Low Voltage Induction Heating Board > http://www.ebay.com/sch/i.html?_nkw=1000w+induction+heating&_sop=15 > > I wonder if they'll levitate an aluminum chunk before meltin git? Bend > the coil into cone shape. Probably needs water. > > For a 20A supply I'd rectify AC line with an SCR halfbridge dimmer, > crank it down to 48V. Or maybe a cheap 220:120 kilowatt xfrmr > hooked backwards. Those "international voltage converter" big > transformers aren't too expensive, especially if they're free in > your garage junkpile.this one will run off the mains. http://www.aliexpress.com/item/2KW-electromagnetic-heating-control-panel-2000W-electromagnetic-heater-induction-heating-control-panel/32232152208.html?spm=2114.01020208.3.10.xq2ljd&ws_ab_test=searchweb201556_1_79_78_77_80,searchweb201644_5,searchweb201560_1 pity about the chinglish. -- \_(ツ)_
