Solution to clogged hole with solder

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msegarra
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Solution to clogged hole with solder

Post by msegarra » Sun Oct 18, 2020 10:50 am

I’m using a handheld soldering gun from jbc soldering but occasionally it slips and puts a little too much solder on the pad clogging the hole I also have the Hakko er 301 desoldering gun as well and it removes 80% of the solder but the hole remains clogged so I was hoping to ask here if anyone might have a suggestion for how to clear a clogged hole from solder?

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Re: Solution to clogged hole with solder

Post by jochem » Sun Oct 18, 2020 11:28 am

I would try either desolder wick or heat it up with you solder iron and then dab a surplus resistor leg in and out.

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Re: Solution to clogged hole with solder

Post by Reality Checkpoint » Sun Oct 18, 2020 11:33 am

This is the perfect tool - highly recommended!

https://www.thonk.co.uk/shop/engineer-s ... dersucker/

Available at Thonk or other major retailers.

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msegarra
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Re: Solution to clogged hole with solder

Post by msegarra » Sun Oct 18, 2020 11:50 am

Reality Checkpoint wrote:
Sun Oct 18, 2020 11:33 am
This is the perfect tool - highly recommended!

https://www.thonk.co.uk/shop/engineer-s ... dersucker/

Available at Thonk or other major retailers.
Thank you I’ll have to try it

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Re: Solution to clogged hole with solder

Post by cretaceousear » Sun Oct 18, 2020 11:55 am

I heat it all up and blow very hard at it, eyes closed of course. Works ok but does leave fine streaks of tin to clear away. I did try a spring loaded solder sucker but it's an exercise needing three hands.
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Re: Solution to clogged hole with solder

Post by Flounderguts » Sun Oct 18, 2020 11:58 am

I have a cheap set of micro drill bits and a hand held bit holder. I don't like to heat up the board a lot when I'm desoldering stuff, and sometimes the surface tension is so high that it's really hard to get that web out.

I usually find a bit that is smaller than the hole, and drill it out by hand. Solder is soft, and there's a bit of a dimple, which makes it easy to start.

If the hole is bigger or smaller than the bits I have (not usual, but occasionally) then I will heat up the solder and then blow it out with a shot of compressed air. Actually, those cans of compressed air computer keyboard cleaners work perfectly. It's last resort for me, because I don't like spraying solder out the backside...and I inevitably do it in a hurry and blow my waiting components off the desk or something.
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Re: Solution to clogged hole with solder

Post by MikeDB » Sun Oct 18, 2020 12:07 pm

Reality Checkpoint wrote:
Sun Oct 18, 2020 11:33 am
This is the perfect tool - highly recommended!

https://www.thonk.co.uk/shop/engineer-s ... dersucker/

Available at Thonk or other major retailers.
Hmm. Not that happy with the look of that one as the plunger could come up straight into your eye.

Have a look for one with a guard such as this.
https://uk.rs-online.com/web/p/desolder ... s/4794197/
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Re: Solution to clogged hole with solder

Post by steviet » Sun Oct 18, 2020 1:16 pm

Flounderguts wrote:
Sun Oct 18, 2020 11:58 am
I have a cheap set of micro drill bits and a hand held bit holder. I don't like to heat up the board a lot when I'm desoldering stuff, and sometimes the surface tension is so high that it's really hard to get that web out.
+1 for micro drill bits. The one I purchased was listed as a "Pin Vise". Works great when the wick or pump can't get that stubborn solder out! You can operate them with a single hand as well.
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Re: Solution to clogged hole with solder

Post by msegarra » Sun Oct 18, 2020 1:24 pm


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Re: Solution to clogged hole with solder

Post by Synth Con Meo » Sun Oct 18, 2020 1:47 pm

If the hole is something that you are going to mount say a resistor or capacitor or anything with a long lead then what I do is cut one of the leads short. Then I insert the long lead into the other pad hole opposite of the clogged hole. That way it will help line up the shorter lead. Then I grab the short lead with needle nose and hold it down onto the clogged hole.

I'll then heat the short lead and or the clogged hole with the soldering iron while pushing the lead down into the hole. If you can get the lead at least sticking out the other side of the clogged hole then you can grab that end and reheat the solder and pull the component all the way down and resolder it.
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Re: Solution to clogged hole with solder

Post by ljwall83 » Sun Oct 18, 2020 3:01 pm

The technique i use which I find very effective (using a no-brand bargain basement solder sucker): Hold the PCB vertical with something. Apply heat to one side, use solder sucker from the other side.

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Re: Solution to clogged hole with solder

Post by Bartimaeus » Sun Oct 18, 2020 3:17 pm

it seems kinda unlikely to me that a $13 solder sucker will do what a $200 hakko desoldering gun in incapable of. drilling it out or changing up your technique seem more promising.
jochem wrote:
Sun Oct 18, 2020 11:28 am
heat it up with you solder iron and then dab a surplus resistor leg in and out.
this may seem silly, but i can attest that it often works surprisingly well

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Re: Solution to clogged hole with solder

Post by Flounderguts » Sun Oct 18, 2020 3:26 pm

msegarra wrote:
Sun Oct 18, 2020 1:24 pm
Would these work? https://www.harborfreight.com/20-pc-ca ... 62379.html
They look fine! I have something like this:

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Re: Solution to clogged hole with solder

Post by Whelm » Sun Oct 18, 2020 8:56 pm

I have one of those jewelers drills and I've never thought to use it for this purpose. How clever.

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Re: Solution to clogged hole with solder

Post by latigid on » Mon Oct 19, 2020 12:33 am

Desoldering braid to remove the last remenants always works for me. You need some sort of flux to make the solder flow (contained in quality braid that's not too old). If you can get most of it out, I also sometimes go for the "push through" method.

I'd advise caution when drilling out pads. You could strip off the interior plating if you catch the edge but I guess you're using tiny bits that don't go near the sides.

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Re: Solution to clogged hole with solder

Post by Mungo » Mon Oct 19, 2020 2:00 am

Bartimaeus wrote:
Sun Oct 18, 2020 3:17 pm
it seems kinda unlikely to me that a $13 solder sucker will do what a $200 hakko desoldering gun in incapable of.
The best spring loaded solder suckers pull more pressure than the desoldering guns (shop air venturi or pump types). The advantgae of the guns are they heat up all around the pad at the same time.

The usual trick is to jiggle the component lead in the hole while deslodering so the last little bit of solder left behind doesn't take hold.

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Re: Solution to clogged hole with solder

Post by khakifridge » Mon Oct 19, 2020 2:31 am

Wooden cocktail stick or steel sewing needle: melt solder, poke through.

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Re: Solution to clogged hole with solder

Post by Jarno » Mon Oct 19, 2020 7:28 am

+1 Toothpick works really well, you can get them in very thin variants. Mine have a menthol smell, which is a bit weird when soldering :)

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Re: Solution to clogged hole with solder

Post by MoyaMoya » Mon Oct 19, 2020 7:42 am

I have a Hakko FR-300 desoldering gun and I find when the last bits of solder are not coming out, it is time to disassemble and clean the diaphragm.

While the ceramic filter does a good job at keeping the solder out, rosin can make it's way back into the pump.

There are also various sized tips you can order. I usually use the largest tip they have for through hole components.

Maintenance and servicing are the name of the game when comes to Desoldering guns.

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Re: Solution to clogged hole with solder

Post by BugBrand » Mon Oct 19, 2020 7:48 am

It might seem backwards but sometimes adding some fresh solder then helps free things up - guess it is likely due to extra flux.
I do tend to use braid but will often add a little more fresh solder if the hole gets clogged as described.

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Re: Solution to clogged hole with solder

Post by KSS » Mon Oct 19, 2020 8:34 am

:agree:

The new solder closes up the hole so *any* suction device works better. And maybe more important, the new solder brings new flux into the area. Quite often the solder you're trying to remove has no flux to give. When you give a flux, results improve! ;)

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Re: Solution to clogged hole with solder

Post by lusoman » Mon Oct 19, 2020 8:41 am

Bartimaeus wrote:
Sun Oct 18, 2020 3:17 pm
it seems kinda unlikely to me that a $13 solder sucker will do what a $200 hakko desoldering gun in incapable of. drilling it out or changing up your technique seem more promising.
jochem wrote:
Sun Oct 18, 2020 11:28 am
heat it up with you solder iron and then dab a surplus resistor leg in and out.
this may seem silly, but i can attest that it often works surprisingly well
I just push it through and wiggle, without pulling it out. Usually that's enough, and when cool it will slip right out. BTW, I tend to use something like a 1N4004 leg - a bit meatier.
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Re: Solution to clogged hole with solder

Post by lusoman » Mon Oct 19, 2020 8:54 am

Oh, and a touch of flux helps...
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Re: Solution to clogged hole with solder

Post by mtts » Mon Oct 19, 2020 3:55 pm

I use one of those fine tweezers I bought thinking I’d get into SMD work. Much sturdier than resistor leads.

Glad to read others have this problem as well, btw. I thought there was something really wrong with my soldering skills. Now I know I’m not the only one.

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Re: Solution to clogged hole with solder

Post by snowtires » Mon Oct 19, 2020 6:00 pm

Before ascended to owning a desoldering tool, I used a double-sided metal toothpick-looking-thing from a generic 'soldering tools kit.' Jab it up into the hole, heat on the opposite side and push the board down on the spike or the spike into the board, whichever is easier.

https://www.amazon.com/Kaisi-Profession ... 50&sr=8-5

Like these things with the orange (I'm colorblind, they look orange) handle in the middle, the one on the far right.

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