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reflow ovens DIY
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page 1, 2, 3  Next [all]
Author reflow ovens DIY
andrewF
Here's a few I have been looking at:
reflow controller v2

zallus (kickstarter just finished, no rely to my emails seriously, i just don't get it )

controlleo2 - on ebay as full or partial kits

the other option is to get a multi ramp (usually 16) PID controller and set that up with a toaster oven. Most of the kits are basically something similar, although designed for a single purpose. The ebay/Chinese made cheap reflow ovens don't seem to get good reviews.....has somebody tried these?
adam
someone got one in shenzen along with a pick & place and paste dispenser

https://www.youtube.com/watch?v=GIRLY3VNNVw
andrewF
just to follow up on this;

I got the controleo2 kit, as far as I could work out, it was cheaper than buying the components individually and saved me hunting around for the correct parts. The guy sent it same day as I ordered and everything was there. It has the ability to control 4 relays, so the two elements plus a booster element and a fan (optional). Most of the other kits only control the entire oven via the mains lead and it seems some ovens struggle to get to the correct temps in the proper time frame.

Oven was a $30 PoS from Kmart.

It all went together easily, you do have to deal with mains wiring and consider the effects of heat on the components.

The controller works fine, it operates in learning mode at first and you have to let it cool down and restart until it is happy. Took three runs for mine.

now to wait for my PCBs and stencils BOOM!

(oven is on the top btw razz )
falafelbiels
Is it worth it without stencils?
andrewF
If you can get a good technique going to blob the right amount of solder paste on the pads, it is.

I tried applying solder paste by hand a few times and then using my hot air gun to melt it, it went okay but using the hot air gun felt somewhat dodgy - difficult to heat smoothly & evenly.
adam
you can get an auto paste dispenser that dispenses a small controllable amount of paste each time - if this is the thread i think it is i linked to some videos above about someone who got one in shenzen
thetwlo
has this changed?

looks like some ovens are $200-250 USD now, worth it?

guessing that's the average cost of a single module.

any experiences?
andrewF
thetwlo wrote:
has this changed?

looks like some ovens are $200-250 USD now, worth it?

guessing that's the average cost of a single module.

any experiences?


This thread has some great pictures of the results of a cheap reflow oven Dead Banana hihi

There is a bit of a learning curve getting them set up, but once it is done they are generally fine.

I have a solder paste dispenser now too, again a bit of a PITA setting it up (need an air compressor), but it works great and is even fun to use.
thetwlo
so, what's the best solution for building something like the NLC multi-band distortion? oven? gun? iron?
andrewF
thetwlo wrote:
so, what's the best solution for building something like the NLC multi-band distortion? oven? gun? iron?


I hand solder my PCBs all the time, use a medium-fine tipped soldering iron, tweezers & magnifier.
Only use the oven/stencil or paste dispenser when I have to make several boards.

I can supply solder paste stencil files if anybody wants them, there is a company in the USA that makes plastic stencils for under $10
lcf
thetwlo wrote:
has this changed?

looks like some ovens are $200-250 USD now, worth it?

guessing that's the average cost of a single module.

any experiences?

I'd be interested to hear wiggler's opinions about these cheap ovens.
The t952 does not look bad for example.
adam
you can use a hotplate or hot air gun too

https://www.sparkfun.com/tutorials/59
andrewF
lcf wrote:
thetwlo wrote:
has this changed?

looks like some ovens are $200-250 USD now, worth it?

guessing that's the average cost of a single module.

any experiences?

I'd be interested to hear wiggler's opinions about these cheap ovens.
The t952 does not look bad for example.


ask falafelbiels, pretty sure that is what he got
andrewF
adam wrote:
you can use a hotplate or hot air gun too

https://www.sparkfun.com/tutorials/59


These methods can be good. Keep in mind there is a learning curve, so be prepared to destroy a few PCBs before you get any good results.....all part of the fun.
Altitude909
why not just use an industrial ramp/soak controller. People are really reinventing the wheel here, I've been using these for lab work for 20 years.

http://www.omega.com/pptst/CN7500.html $120

The learn mode on these devices is outstanding, it will figure out the heat rate, hysteresis, cool rate etc and adjust itself accordingly. You can attach the thermocouple to the board and use that as the reference temperature (instead of the air temp inside the oven)

I use that exact one to run an oxidization rig where parts need to be heated and held at 800C in small (dumb) furnace with horrible temperature regulation and it will keep the temperaure within 3 degrees of 800 for hours
synthdude
I use the controleo and its rock solid. I rigged up a cheap toaster oven with only one relay controlling the two heating elements inside the oven and it works fine. I insulated the oven with ceramic wool by stuffing it between the outside case and the inside metal case of the toaster. I also put some on the inside floor and on the glass to keep the heat in. It is a bit expensive but it works well.
lcf
andrewF wrote:


ask falafelbiels, pretty sure that is what he got

I dropped him a pm but he does not answer, i'd be happy to hear more from him.
falafelbiels
I actually gave up on it after one and a half week already. I was burning more boards than I was making modules and it smelled horrible in my house.
Surely I was doing something very wrong and I have a feeling I know what.
The boards I used had no ground plane. I have a few boards here that I would like to try it on one more time, but when I do not know.
Do not take my conclusion so far as proof of anything because like I said, I was very probably doing it wrong.
marto
I've got a T-962 and await the parts for the various mods:

https://youtu.be/0ITZXY5Mipc

Will post back results when I get a chance to finish the mods and do some tests. Note the part about swapping masking take for kapton tape to remove the burning/smell issue.
lcf
marto wrote:
I've got a T-962 and await the parts for the various mods:

https://youtu.be/0ITZXY5Mipc

Will post back results when I get a chance to finish the mods and do some tests. Note the part about swapping masking take for kapton tape to remove the burning/smell issue.

Did you test it without mods??
marto
lcf wrote:
Did you test it without mods??


Not yet, it can be unsafe to use it without mods. Unearthed top case, use of masking tape. If there's time before the parts arrived I may get some tests done. You can see videos on youtube showing before/after mod tests.

Also:

https://github.com/UnifiedEngineering/T-962-improvements

https://hackaday.com/2014/11/27/improving-the-t-962-reflow-oven/
falafelbiels
keeping my eye on this one here...
marto
falafelbiels wrote:
I actually gave up on it after one and a half week already. I was burning more boards than I was making modules and it smelled horrible in my house.
Surely I was doing something very wrong and I have a feeling I know what.
The boards I used had no ground plane. I have a few boards here that I would like to try it on one more time, but when I do not know.
Do not take my conclusion so far as proof of anything because like I said, I was very probably doing it wrong.


The smell could be the masking tape (see video posted earlier) and there have been complaints of uneven temperatures at certain parts of the oven. The various mods linked to address these issues. The video above is worth watching if you've not done so already.
DabiDabDab
andrewF wrote:

I can supply solder paste stencil files if anybody wants them, there is a company in the USA that makes plastic stencils for under $10


Could i hear about this, what is the name of the company?
andrewF
DabiDabDab wrote:
andrewF wrote:

I can supply solder paste stencil files if anybody wants them, there is a company in the USA that makes plastic stencils for under $10


Could i hear about this, what is the name of the company?


https://www.oshstencils.com/

I haven't tried them as I need steel stencils that can be re-used many times.
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