Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > sci.electronics.design > #480936

Re: Chinese-made reflow soldering ovens

Cross-posted to 2 groups.

Show all headers | View raw

On 10/08/2017 05:54 PM, Neon John wrote:
> On Sun, 8 Oct 2017 15:40:58 -0500, "Dave M" <dgminala@mediacombb.net>
> wrote:
> 
>> Anyone have any experience or have colleagues who have experience using the
>> Chinese-made reflow soldering ovens such as those being sold on the evil
>> auction place?  The one I've looked at is item number:262955348183 (Model
>> T962).
> 
> My concern (mainly because I have no experience with infrared) is that
> the black chips and components would get hot faster than the shiny
> pins and solder paste.
> 
> I have an oven that I built using a tabletop convection oven and a
> programmable timer.  It works great but it's using hot air to do the
> heating.
>>
>> My eyes have become the major challenge to producing the one- or two-off
>> projects, since many of the parts that are available today are only made in
>> SMD packages.   I realize that placing them onto the board still remains a
>> challenge, but at least with a proper oven, I won't have to hold a soldering
>> iron steady enough to build the boards.
> 
> The neat thing about reflow is that if you put the proper amount of
> paste on each pad, the surface tension of the solder will pull the
> part or chip in line with the pads.
> 
> I've developed an unconventional technique for pasting 0.5 mm pin
> spaced ICs.  I put the chip on its back and use my pressure/vacuum
> paste dispenser to lay a solid stream across each side of the chip.
> 
> I then hold the chip with some pliers while I wipe the other side with
> a Q-tip.  This removes paste between the pins.  Drop the chip in
> place, populate the rest of the board and reflow.  Both my vision and
> my steadiness of hand have declined over the past few years and this
> is how I compensated.

Technique I've used occasionally that so far has always seemed to work 
pretty good for soldering say 14 or 16 pin SOIC "surfboards":

Use regular soldering iron and thin 60/40 solder to tin the pads. Put 
the IC down using tweezers and "tack" the top left and bottom right to 
the board. Apply pressure on the center of the IC using a jeweler's 
screwdriver with one hand (wear a protective glove!) while blasting the 
pins on one side of the IC with hot air from a lightweight heat gun for 
about 10 seconds, back and forth until you visibly see the solder on the 
pads go shiny. Remove heat and hold for another 15 seconds or so, then 
remove pressure and let cool for about a minute. Then repeat for the 
other side.

Then continuity test from the junction of the pin and the package to the 
hole on the board for the mounting hardware. Meter should beep just from 
light contact without applying any pressure at all from the probe to the 
pin. Sometimes there's one pin that didn't quite get a solid connection 
and won't test for continuity without pushing down a bit, but a single 
pin is easy to touch up by hand.

Back to sci.electronics.design | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Chinese-made reflow soldering ovens "Dave M" <dgminala@mediacombb.net> - 2017-10-08 15:40 -0500
  Re: Chinese-made reflow soldering ovens pcdhobbs@gmail.com - 2017-10-08 13:45 -0700
    Re: Chinese-made reflow soldering ovens Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-10-08 23:52 +0100
    Re: Chinese-made reflow soldering ovens Don Kuenz <g@crcomp.net> - 2017-10-08 23:18 +0000
      Re: Chinese-made reflow soldering ovens Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-10-08 16:34 -0700
      Re: Chinese-made reflow soldering ovens pcdhobbs@gmail.com - 2017-10-09 13:05 -0700
    Re: Chinese-made reflow soldering ovens bitrex <bitrex@de.lete.earthlink.net> - 2017-10-09 14:00 -0400
      Re: Chinese-made reflow soldering ovens Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-09 19:06 +0000
        Re: Chinese-made reflow soldering ovens bitrex <bitrex@de.lete.earthlink.net> - 2017-10-09 15:47 -0400
        Re: Chinese-made reflow soldering ovens krw@notreal.com - 2017-10-09 21:28 -0400
          Re: Chinese-made reflow soldering ovens John Devereux <john@devereux.me.uk> - 2017-10-10 08:00 +0100
            Re: Chinese-made reflow soldering ovens krw@notreal.com - 2017-10-10 21:42 -0400
      Re: Chinese-made reflow soldering ovens Jon Elson <jmelson@wustl.edu> - 2017-10-09 14:16 -0500
      Re: Chinese-made reflow soldering ovens Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-10 11:07 +0000
        Re: Chinese-made reflow soldering ovens aioe usenet <hirni47@yahoo.com> - 2017-10-12 05:00 +0700
  Re: Chinese-made reflow soldering ovens Jeff Liebermann <jeffl@cruzio.com> - 2017-10-08 14:17 -0700
  Re: Chinese-made reflow soldering ovens Gerhard Hoffmann <gerhard@hoffmann-hochfrequenz.de> - 2017-10-08 23:26 +0200
  Re: Chinese-made reflow soldering ovens Neon John <no@never.com> - 2017-10-08 17:54 -0400
    Re: Chinese-made reflow soldering ovens bitrex <bitrex@de.lete.earthlink.net> - 2017-10-09 14:17 -0400
      Re: Chinese-made reflow soldering ovens krw@notreal.com - 2017-10-09 21:35 -0400
  Re: Chinese-made reflow soldering ovens Jeff Liebermann <jeffl@cruzio.com> - 2017-10-08 15:37 -0700
  Re: Chinese-made reflow soldering ovens John Larkin <jjlarkin@highlandtechnology.com> - 2017-10-08 15:44 -0700
    Re: Chinese-made reflow soldering ovens Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-10-08 16:01 -0700
      Re: Chinese-made reflow soldering ovens John Larkin <jjlarkin@highlandtechnology.com> - 2017-10-08 16:45 -0700
        Re: Chinese-made reflow soldering ovens Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-10-08 16:49 -0700
  Re: Chinese-made reflow soldering ovens Joe Chisolm <jchisolm6@earthlink.net> - 2017-10-09 11:41 -0500
  Re: Chinese-made reflow soldering ovens Jon Elson <jmelson@wustl.edu> - 2017-10-09 14:13 -0500
  Re: Chinese-made reflow soldering ovens speff <spehro@gmail.com> - 2017-10-12 00:32 -0700

csiph-web