Homebrew_PCBs

Hi all,

Anyone have any thoughts about using this to solder pcbs - it would
seem easy to hack the controls of the cooktop to create soldering
profiles. But, would the "inductive" heater damage the ics?

<https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>

Mark

I would think so ... how do emp damage electronics?

To: homebrew_PCBs@yahoogroups.com
From: mlerman@...
Date: Mon, 31 Dec 2012 13:54:41 -0500
Subject: [Homebrew_PCBs] Nuwave PIC


























Hi all,



Anyone have any thoughts about using this to solder pcbs - it would

seem easy to hack the controls of the cooktop to create soldering

profiles. But, would the "inductive" heater damage the ics?



<https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>



Mark


























[Non-text portions of this message have been removed]

Preheat and turn off the heaters

Sent from my iPhone

On Dec 31, 2012, at 12:54 PM, Mark Lerman <mlerman@...> wrote:

> Hi all,
>
> Anyone have any thoughts about using this to solder pcbs - it would
> seem easy to hack the controls of the cooktop to create soldering
> profiles. But, would the "inductive" heater damage the ics?
>
> <https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>
>
> Mark
>
>


[Non-text portions of this message have been removed]

On Mon, 31 Dec 2012 13:54:41 -0500, you wrote:

>Hi all,
>
>Anyone have any thoughts about using this to solder pcbs - it would
>seem easy to hack the controls of the cooktop to create soldering
>profiles. But, would the "inductive" heater damage the ics?
>
><https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>

If it's a true inductive heater, then it's got KW of RF running
around, causing eddy currents in iron or steel sufficient to make the
metal get to 300 or 400 degrees F.

Roughly as nice as a microwave oven is to a transistor radio, I'd
think.

I suspect that's why people use radiant heating for this kind of
thing.

Harvey

>
>Mark

I use $20.00 toaster oven. Solder paste for some of my surface mount. TQFPs and other fine pitch devices.

Dab a bit of solder paste on a "reference" pad and watch for the solder paste to melt. Easier to keep track and when you see it melt immediately turn off the oven, wait about 20 seconds and pop open the door. poor mans way of trying to mimic the reflow temperature profile.

Have a dedicated toaster oven and do not use it to heat food!!.

One of my project is to build a simple controller to do this. so I can actually meet the reflow temperature profile. It's easy but have too many other things right now.

--- In Homebrew_PCBs@yahoogroups.com, Harvey White <madyn@...> wrote:
>
> On Mon, 31 Dec 2012 13:54:41 -0500, you wrote:
>
> >Hi all,
> >
> >Anyone have any thoughts about using this to solder pcbs - it would
> >seem easy to hack the controls of the cooktop to create soldering
> >profiles. But, would the "inductive" heater damage the ics?
> >
> ><https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>
>
> If it's a true inductive heater, then it's got KW of RF running
> around, causing eddy currents in iron or steel sufficient to make the
> metal get to 300 or 400 degrees F.
>
> Roughly as nice as a microwave oven is to a transistor radio, I'd
> think.
>
> I suspect that's why people use radiant heating for this kind of
> thing.
>
> Harvey
>
> >
> >Mark
>

Agreed. I use a $20 toaster oven. It is *never* used to heat food.

--- In Homebrew_PCBs@yahoogroups.com, "smilingcat90254" <smilingcat@...> wrote:
>
> I use $20.00 toaster oven. Solder paste for some of my surface mount. TQFPs and other fine pitch devices.
>
> Dab a bit of solder paste on a "reference" pad and watch for the solder paste to melt. Easier to keep track and when you see it melt immediately turn off the oven, wait about 20 seconds and pop open the door. poor mans way of trying to mimic the reflow temperature profile.
>
> Have a dedicated toaster oven and do not use it to heat food!!.
>
> One of my project is to build a simple controller to do this. so I can actually meet the reflow temperature profile. It's easy but have too many other things right now.

I use a USB thermocouple to plot the temperature in real-time.
The one I use is the TEMPer1K3 from PCSensor.Com for ~$25.
The TEMPer1K4 is ~$20. The former has electrical isolation
whereas the later does not. This probe has a button that causes
it to behave like a keyboard and start "typing" the current
probe temperature once a second.

I banged together a Python script that plots the temperature
in real-time:

http://gramlich.net/projects/temprof/temprof.py

A target temperature profile is:

http://gramlich.net/projects/temprof/leaded_profile.csv

I actually control the temperature by opening and closing
the toaster oven door by small increments. Eventually, I
want to control the toaster over with a solid state relay,
but until then the manual control works well enough for me.

For a total cost of $20 (toaster oven) + $25 (usb thermocouple)
= $45 I have a solution that works every time. I do get an
occasional solder bridge, but that is more of a function of
me still learning to apply solder paste via a solder stencil.

Regards,

-Wayne

Interesting gadgets, too expensive still for what is inside. I have pondered making may own but not much into cooking. Bearing heaters are distant cousins, they let you slip the 'turn' of the bearing over a transformer core leg and heat it fast and repeatably to expand it for dropping onto a shaft with a shrink fit.

The heating is via eddy current fields (no EMP) so you need a conductive 'pot' on the cooker before it will work correctly. The frequency should not be particularly high perhaps 100-120 Hz. Very little of the AC magnetic field will penetrate a good electrical conductor (such as a copper, aluminium or silver plate/sheet) and if you are nervous you can add a sheet of iron or mu-metal to block out any residual field that bothers you (just check the temperature handling and curie point of the mu-metal before you pay for it).

There was an up-market eddy current heated soldering iron but this had the magnetic coil enclosed in the bit so no expected field leakeage.

The built coocker in profiles may have slightly low temperatures but hacking it could do the trick. A South African made similar hotplate (similar price too) claims and appears to have a temperature sensor but I have only seen the units at shows so not sure, if a non-contact IR thermometer is built in then it could indeed be an interesting heating plate controller.

Kalle
--
Johannesburg, South Africa

--- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:
>
> Hi all,
>
> Anyone have any thoughts about using this to solder pcbs - it would
> seem easy to hack the controls of the cooktop to create soldering
> profiles. But, would the "inductive" heater damage the ics?
>
> <https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>
>
> Mark
>

Then I guess it comes down to "what you have on hand" compared to the price of buying something....

I got my toaster oven local for less than 20$ used ... another 14$ for a digital thermometer that goes to 500 degrees ... a bit of tinfoil for heat shield and im up and working ....

To: Homebrew_PCBs@yahoogroups.com
From: kalle@...
Date: Wed, 2 Jan 2013 14:43:46 +0000
Subject: [Homebrew_PCBs] Re: Nuwave PIC


























Interesting gadgets, too expensive still for what is inside. I have pondered making may own but not much into cooking. Bearing heaters are distant cousins, they let you slip the 'turn' of the bearing over a transformer core leg and heat it fast and repeatably to expand it for dropping onto a shaft with a shrink fit.



The heating is via eddy current fields (no EMP) so you need a conductive 'pot' on the cooker before it will work correctly. The frequency should not be particularly high perhaps 100-120 Hz. Very little of the AC magnetic field will penetrate a good electrical conductor (such as a copper, aluminium or silver plate/sheet) and if you are nervous you can add a sheet of iron or mu-metal to block out any residual field that bothers you (just check the temperature handling and curie point of the mu-metal before you pay for it).



There was an up-market eddy current heated soldering iron but this had the magnetic coil enclosed in the bit so no expected field leakeage.



The built coocker in profiles may have slightly low temperatures but hacking it could do the trick. A South African made similar hotplate (similar price too) claims and appears to have a temperature sensor but I have only seen the units at shows so not sure, if a non-contact IR thermometer is built in then it could indeed be an interesting heating plate controller.



Kalle

--

Johannesburg, South Africa

--- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:

>

> Hi all,

>

> Anyone have any thoughts about using this to solder pcbs - it would

> seem easy to hack the controls of the cooktop to create soldering

> profiles. But, would the "inductive" heater damage the ics?

>

> <https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>

>

> Mark

>


























[Non-text portions of this message have been removed]

I've used a toaster oven with a controller and found, especially with
the small boards I generally make, that it can overheat the board.
This is due to not being able to measure the temperature exactly at
the pcb, and not being able to see the pcb as it cooks. Currently I
use a very nice lab-grade hotplate (ebay) where I can see exactly
what's happening. I recently saw where someone had put an ir
thermometer focused on the hotplate to provide feedback to a
temperature controller. Simple to do and might be an excellent solution.

The best solution would be to clamp a very small thermocouple to a
pad on the pcb itself and use that for feedback.

Mark


At 10:57 AM 1/2/2013, you wrote:

>Then I guess it comes down to "what you have on hand" compared to
>the price of buying something....
>
>I got my toaster oven local for less than 20$ used ... another 14$
>for a digital thermometer that goes to 500 degrees ... a bit of
>tinfoil for heat shield and im up and working ....
>
>To: Homebrew_PCBs@yahoogroups.com
>From: kalle@...
>Date: Wed, 2 Jan 2013 14:43:46 +0000
>Subject: [Homebrew_PCBs] Re: Nuwave PIC
>
>
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>
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>
>
> Interesting gadgets, too expensive still for what is
> inside. I have pondered making may own but not much into
> cooking. Bearing heaters are distant cousins, they let you slip
> the 'turn' of the bearing over a transformer core leg and heat it
> fast and repeatably to expand it for dropping onto a shaft with a shrink fit.
>
>
>
>The heating is via eddy current fields (no EMP) so you need a
>conductive 'pot' on the cooker before it will work correctly. The
>frequency should not be particularly high perhaps 100-120 Hz. Very
>little of the AC magnetic field will penetrate a good electrical
>conductor (such as a copper, aluminium or silver plate/sheet) and if
>you are nervous you can add a sheet of iron or mu-metal to block out
>any residual field that bothers you (just check the temperature
>handling and curie point of the mu-metal before you pay for it).
>
>
>
>There was an up-market eddy current heated soldering iron but this
>had the magnetic coil enclosed in the bit so no expected field leakeage.
>
>
>
>The built coocker in profiles may have slightly low temperatures but
>hacking it could do the trick. A South African made similar
>hotplate (similar price too) claims and appears to have a
>temperature sensor but I have only seen the units at shows so not
>sure, if a non-contact IR thermometer is built in then it could
>indeed be an interesting heating plate controller.
>
>
>
>Kalle
>
>--
>
>Johannesburg, South Africa
>
>--- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:
>
> >
>
> > Hi all,
>
> >
>
> > Anyone have any thoughts about using this to solder pcbs - it would
>
> > seem easy to hack the controls of the cooktop to create soldering
>
> > profiles. But, would the "inductive" heater damage the ics?
>
> >
>
> >
> <https://www.nuwavepic.com/?ref_version=PPC-ADWORDS-PN07&gclid=COKKu_WqxbQCFcuZ4Aod9h4AxQ>
>
> >
>
> > Mark
>
> >
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>[Non-text portions of this message have been removed]
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>------------------------------------
>
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