Author Topic: DIY reflow oven - suitable UK/EU candidates  (Read 22663 times)

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Online jmelson

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #50 on: May 13, 2017, 07:25:55 am »
I got a Philps P&P machine in 2007 and came up with my own reflow oven scheme.  I got the biggest GE toaster oven they had at our WalMart store.  It will hold a board up to 8 x 11" or so, which I occasionally do.  I got a ramp and soak temperature controller on eBay and some really small thermocouple extension wire.  When I tried to do the reflow with the thermocouple just in the air, it fried the boards black.  So, I poke the thermocouple into a through hole in the board, and it controls the actual board temperature.  I do both leaded and lead-free soldering, and adjust the final temp for the solder being used.  The ramp and soak controller can be set for degrees at start and end of the ramp and time of the ramp.  So, I have it programmed for ramp to 180 C, hold for 1 minute, ramp to desired temp, hold 1 minute, then cool down.

The oven has 4 heating elements that run horizontally, two above the rack, two below.  The elements run the full length left to right.  I made some rectangular rings out of stainless steel rod that sit on the racks.  As I usually have parts on both sides of the boards, I do the backs first (usually just decoupling caps and small passives) then do the top side with the chips.  The wire rings keep the back side components from touching the rack.

I have had very good results with this, and have done over 1000 boards.

Jon
 
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Offline bit.cyber

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #51 on: June 01, 2017, 06:55:53 am »
I was able to source the Boom Mat in Europe at a couple of different auto suppliers. Typically high performance / race car accessory suppliers.
Specifically I purchased suitable Boom Mat from TurboZentrum in Berlin, Germany.

There's a related thread which I started detailing my efforts: http://www.eevblog.com/forum/projects/adventures-in-home-reflow-toaster-oven-conversion/msg1177124/#msg1177124

Plus also check out my website with relevant postings: http://lagrangianpoint.net/tag/reflow/
Just hanging around... (And do visit lagrangianpoint.net for the latest interesting projects underway)
 

Offline Podrowski

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #52 on: November 16, 2017, 10:30:05 pm »
I know this is an older topic, but since it's referred to from the build guide on the Whizzo website it seems like the right place.

Another usable candidate for a reflow oven could be the Rommelsbacher BG950 'Speedy'. I'ts a 10 liter model, slightly bigger than the Steba KB 11. It has a top and bottom quarz heating element for a total 950 watts heating power. It also allows for the tray to be positioned exactly between the elements. It is a little low on power, but it's also quite cheap when buying from German Amazon, so you could buy two and use the heating elements of the second oven to double up on heating power.

Wait... What?
 

Offline ElektroQuark

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #53 on: November 16, 2017, 10:51:55 pm »
You can see my attempts for a reflow oven HERE.

It uses the Andy Brown reflow controller.
It's a 10 liter one, very small, vey cheap.
You will see how a resistance heating element fails at trying to maintain the correct profile.
 
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Offline okp

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #54 on: December 16, 2017, 08:07:30 pm »
Hey, I got my Controleo3; but can't find a small good oven. Any support is welcome !

http://www.eevblog.com/forum/beginners/reflow-oven-controleo3-in-eu/msg1376160/#msg1376160
 

Offline ironcurtain

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #55 on: December 19, 2017, 05:03:16 pm »
I have been looking through Amazon for my country and Germany, considering these:

https://www.amazon.es/dp/B01LCOF9PI/_encoding=UTF8?coliid=I3LCQYFQHSMOHY&colid=EWIJYZXBUT9K&psc=1
https://www.amazon.de/Spice-Habanero-elektrischer-Umluftofen-5-6-verschiedene/dp/B01LCOF9PI
(convection, Spice - Habanero electric convection oven - 23 - 31 - 40 liters - 1380 - 1500 watts)

https://www.amazon.es/dp/B01MF5ORJ0/_encoding=UTF8?coliid=I1ME95WUL31JW0&colid=EWIJYZXBUT9K&psc=0
https://www.amazon.de/TZS-First-Austria-Innenbeleuchtung-Doppelglast%C3%BCr/dp/B01MF5ORJ0
(TZS First Austria - 19 Liter Minibackofen mit Kr├╝melblech | 1380 Watt | Innenbeleuchtung | Umluft | Mini Pizza-Ofen | Doppelglast├╝r | Timer | Backofen | Mini Backofen | Pizzaofen)
Probably my first choice, it seems well built and it's also a convection oven. Two heating elements plus fan and under 80 eur.

https://www.amazon.es/dp/B0079WCPFU/_encoding=UTF8?coliid=I1QCG270VWF3KO&colid=EWIJYZXBUT9K&psc=0
Probably my second choice, though the Spice is even cheaper. Looks solid, not sure if it has a fan. No information on heating elements.

https://www.amazon.es/dp/B01CI2JX5U/_encoding=UTF8?coliid=I3GRFSW1PW03F4&colid=EWIJYZXBUT9K&psc=1
(Moulinex Optimo, seems like you just pay for the brand here)

I have a few boards that will be a PITA to do by hand, so I'm more or less rushed to get this build started. Any comments? I hope this helps other people too.
 

Offline TIOUK

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Offline yiancar

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #57 on: February 28, 2018, 01:00:56 am »
A bit of an old thread but.. here we go.

My attempted solution to our 230V problem is to combine 2 relatively big 120V ovens. Ill document as much as I can.

Firstly the ovens I chose where this B+D ones https://www.amazon.com/BLACK-DECKER-TO3250XSB-Convection-Countertop/dp/B00LU2I428/.

Firstly I disassembled one and got the elements out. It was pretty easy, just some metal tabs.

Then copied the cutouts over to the other oven. I tried to space them out as best as I could but the back element is very close to the back wall. I hope this is not going to be a problem.

I am heading to buy some high temp silicone to secure the elements in place and then wire them in series. They are rated for 650W 60V so 4 will do the job.

Ill keep you posted:)
 

Offline floobydust

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #58 on: March 01, 2018, 05:35:46 am »
I use an open source Arduino with RocketScream Reflow Oven Controller Shield. It is discontinued but the sketch and schematic are very simple. Replaced by the Tiny Reflow Controller using dedicated ATtiny1634.
Point is, using Arduino you can change the software to your exact needs. It's a basic state-machine.
Avoid crapola MAX6675 thermopcouple-to-digital IC, it is terrible and picks up hum, cellphone RF etc and causes your reflow profile to malfunction due to temp readings being noisy. The newer MAX31856 I have not tried.
« Last Edit: March 01, 2018, 05:44:52 am by floobydust »
 

Online doobedoobedo

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #59 on: March 03, 2018, 12:12:26 pm »
I used one of the ovens Aldi sell from time to time. Rolled my own controller from an arduino pro-mini, a MAX6675 (which works just fine), a little OLED and 3 buttons.

There's no real need for PID on these, mine samples the temperature and switches on or off at 2Hz. It can store several different programs (I use it for drying wood, curing resin and tempering steel as well as soldering). It could use a little more power and I have some extra elements which I'll install when I eventually get round to it :).
 

Offline floobydust

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #60 on: March 03, 2018, 01:13:32 pm »
Anyone using a convection oven?
 

Offline IconicPCB

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #61 on: March 03, 2018, 01:40:59 pm »
Yes

I am using  Kambrook convection oven.

No changes to the controller. st it to 150C and let it run for 3 minutes, change the set point to 250C and watch the solder paste melt. When melted switch it off. Open and let the PCB cool down with the oven for a couple of minutes and then remove.
Handles leaded and lead free paste.
!.5kW heating element.From 150C to finished about a minute and a half. 
 

Offline floobydust

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #62 on: March 03, 2018, 02:24:53 pm »
I figured the fan would be better. Stir up and distribute the hot air better, as long as it doesn't blow off SMT parts.
 

Offline IconicPCB

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #63 on: March 03, 2018, 10:28:40 pm »
The oven works by sharing heat with the dish it cooks.

The larger the thermal mass of the oven the more uniform the temperature.
The fan amplifies the thermal mass of the oven providing for a more uniform thermal profile.

 

Online jmelson

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #64 on: March 04, 2018, 05:26:20 am »
I figured the fan would be better. Stir up and distribute the hot air better, as long as it doesn't blow off SMT parts.
I have a toaster oven that I use for reflow soldering.  It has 4 linear elements, 2 above and 2 below the rack.  It also has a fan for convection.  I really have NOT noticed the fan does anything, and generally do not use it.  It is probably way too low volume.  Certainly NO WAY it would ever blow parts off the board!

Jon
 

Offline IconicPCB

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #65 on: March 04, 2018, 10:28:57 am »
John....

Use the fan ....

even though it does not have the force especially since the elements are probably shorter wave length IR elements.
 

Online jmelson

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #66 on: March 05, 2018, 04:03:11 pm »
John....

Use the fan ....

even though it does not have the force especially since the elements are probably shorter wave length IR elements.
I've used the fan, and NOT used it.  I can't find ANY DIFFERENCE in the finished boards.  I was hoping it would even out temp variations in the oven, but I don't see that.  it is a TINY little fan outside the oven, and may end up blowing a lot of outside air into the oven.

Jon
 

Offline yiancar

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #67 on: April 23, 2018, 10:13:56 pm »
My Controleo3 oven is finally done! Picture attached.

I have performed the learning cycle and it seems to be doing very well. The 240v conversion seems to work wonders.

I will be testing some PCBs with leaded paste. What paste do you guys use?
 

Offline IconicPCB

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #68 on: April 23, 2018, 11:38:22 pm »
Did you applythe gold reflective tape onto the glass door?
What is that product?
 

Offline yiancar

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Re: DIY reflow oven - suitable UK/EU candidates
« Reply #69 on: April 30, 2018, 10:19:39 am »
Did you applythe gold reflective tape onto the glass door?
What is that product?

This is called Reflect-A-Gold. You can have a look here on the details of how I insulated the oven.
http://www.whizoo.com/reflowoven
 


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