# Electric vaccum solder sucker?

#### spinnaker

Joined Oct 29, 2009
7,835
Wow don't let your kids search on vacuum pump on eBay.

#### MrSoftware

Joined Oct 29, 2013
2,015
This is the one I have that I like the most, though it's not the most durable:

I have one of those radio shack ones with the red squeeze bulb too, and the idea is good but it doesn't seem to have the same heat capacity as the one I linked above. So it doesn't work well for me for anything that has a lot of copper in it, or for desoldering multiple pins in a row. It just doesn't stay hot. It could be a problem with my specific unit as I haven't tried a different one.

Joined Jul 18, 2013
24,251
it doesn't seem to have the same heat capacity as the one I linked above. So it doesn't work well for me for anything that has a lot of copper in it, or for desoldering multiple pins in a row. It just doesn't stay hot. It could be a problem with my specific unit as I haven't tried a different one.
Everyone seems to be diss'ing the RS one, mine must be a different version as I am certainly not seeing the same results!
Max.

#### Tonyr1084

Joined Sep 24, 2015
6,624
don't let your kids search on vacuum pump on eBay
Why not? I searched it and found all kinds of vacuum pumps. Nothing untoward there. Maybe my browsing history is different from yours ? ? ?

#### MisterBill2

Joined Jan 23, 2018
10,580
I really like the my Radio Shack manual vacuum pump, does a really good job.
I see you can still get them, ebay etc.
Max.

View attachment 170322
That is the one I use, Max. The problem is that those tips wear away far too rapidly. And I no longer have machine shop access to make more of them.

#### spinnaker

Joined Oct 29, 2009
7,835
Why not? I searched it and found all kinds of vacuum pumps. Nothing untoward there. Maybe my browsing history is different from yours ? ? ?

Sort by lowest to highest price.

#### Raymond Genovese

Joined Mar 5, 2016
1,658
I have these (which have been mentioned)

and they work, sort of, but I would like to have the power of one of these:

in a small form like these

and could you design it so that it can be built it for $20 Thread Starter #### spinnaker Joined Oct 29, 2009 7,835 I have these (which have been mentioned) View attachment 170354 in a small form like these and could you design it so that it can be built it for$20

This is a good ideae but you would have to replace the tip somehow.

#### spinnaker

Joined Oct 29, 2009
7,835
and they work, sort of, but I would like to have the power of one of these:

in a small form like these

#### MisterBill2

Joined Jan 23, 2018
10,580
One source of vacuum pumps that is cheap is in used medical appliances. In many cases even the ones delivering pressure have a pump that has an accessible suction port. I have recovered two like that, one is indeed quite bulky, the other is fairly small. The challenge with solder sucking is that the flow rate needs to be quite large, and the flow must start quickly when wanted. So medium diameter hoses and valves located close to the point of use.

#### DNA Robotics

Joined Jun 13, 2014
615
A compressor from a refrigerator or small window A/C is free.
Maybe a half gallon in size.
It will pull a vacuum of 30" mercury or better.
I planned on using the small air blower nozzle as a valve so it has time to accumulate vacuum and only used a little bit at a time or the air flow would cool the desoldering tip.

#### spinnaker

Joined Oct 29, 2009
7,835
A compressor from a refrigerator or small window A/C is free.
Maybe a half gallon in size.
It will pull a vacuum of 30" mercury or better.
I planned on using the small air blower nozzle as a valve so it has time to accumulate vacuum and only used a little bit at a time or the air flow would cool the desoldering tip.

Assuming one has an old refrigerator or AC laying around.

#### MisterBill2

Joined Jan 23, 2018
10,580
Assuming one has an old refrigerator or AC laying around.
In my area they are often available, and don't forget dehumidifiers as a source of compressors, also ice maker machines. Of course there are a lot of places where any sort of free-lance recycling is forbidden by all sorts of laws. Avoid those biggoted areas, they are toxic

#### MisterBill2

Joined Jan 23, 2018
10,580
That pump could produce enough vacuum but it will need a tank to provide enough flow to remove solder. The whole secret of solder sucking is a fast rise in flow rate and the high flow rate itself. That is because the solder has to move while in the fluid state.

#### Raymond Genovese

Joined Mar 5, 2016
1,658
I wonder, and am just thinking out loud...you really only need to move the solder a few mm in the liquid state. Would it be possible, in principle, to combine the vacuum pump idea with the solder braid idea? We have probably all used that braid before. Something like sucking the liquid solder into the braid? Again, just thinking out loud.

#### spinnaker

Joined Oct 29, 2009
7,835
I wonder, and am just thinking out loud...you really only need to move the solder a few mm in the liquid state. Would it be possible, in principle, to combine the vacuum pump idea with the solder braid idea? We have probably all used that braid before. Something like sucking the liquid solder into the braid? Again, just thinking out loud.

That would solve the need for a tank.