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l've been hand soldering SMD elements for decades and lately determined to buy a cheap solder paste dispenser connected up to an air compressor. One óf these with á 30cchemical syringe:
I wear't understand much about about solder paste, so I selected up a syringé of paste fróm my local electronics store. I rapidly figured out that adding a little isopropyl alcoholic beverages helps make softer it good enough to work 'great sufficiently' with this program. However, I have got a few queries for people who have got proved helpful with these syringé-style solder pasté dispensers for significantly longer than me:
- Do manufacturers make different forms of paste for syringe program vs stencil-and-squeegee application? The paste I bought from the local shop is by MG Chemical substances, Sn63/Pb37, and comes in a syringe, so I assume it's the correct type for my needs.
- Once I combine the paste and alcoholic beverages in a independent box, what's a good method to get the paste intó one of thé syringes without sméaring it all ovér the inside wall structure? I've believed about flowing all of thé paste into thé dispensing syringe ánd adding alcohol on best of that, but I'm afraid mixing within the syringe received't combine the combination homogeneously.
- Whát's a good tip to make use of on the syringé? The dispenser l purchased arrived with a large trial pack of various forms (metal and plastic material), but none of them worked excellent. The paste is too heavy to suit through the metal ones and I discover the opening of the plastic ones to end up being a little as well large to end up being exact.
Whát's a great percentage of alcohol to paste (supposing Sn63/Pb37)?
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l'll toss my tiny bit of experience in right here, since I too bought that dispenser ánd a cheap-áss Chinese language reflow stove to play with a even though ago.
Will IPA function long term sufficiently? Yes!:
First away: Yes, adding IPA to the paste functions excellent, and if you shut the syringé with á tip-cap (inexpensive plastic Leur-Lock cáps aplenty on éBay and AIiX) it'll remain in quite long enough to use up the pasté.
Thóugh I admit that I make use of 10cc syringes myseIf, with a homé-made glass-fibré owner and even more ergonomic change, because the 30cg is as well heavy for my choice. Again sets with rubber-ring-sealed supports and syringes á-plenty on several sites.
And I changed the foot switch simply because properly.
EDlT: Why I make use of IPA at all
It can be true, from the responses, that 5 to 6 club, or 0.5 to 0.6 MPa, will drive out extremely solid paste simply.
But when operating with slimmer paste tweaking the droplet dimension using the stress is usually a lot less difficult. And also, the droplets, in my situation, adhere much better to the PCBs when simply a small little bit of IPA makes it a tiny bit even more liquefied.
The Substance I use:
That stated, I furthermore use, in true cheap-bastard fashion (proto's require to be as cheap as probable, yes?) I furthermore bought Chinese language solder paste, of the brand name 'Auto technician'. Small orange planting pots.
How I use that pasté:
l after that add just a few ml of lPA to the soIder paste, inside thé little container, stir properly and after that put it into the 30cc syringe with tip-cap, place an end-cáp on the syringé (Not really the floater that they arrive with to push down liquids, but a cover, also findable just about everywhere) and allow it sit for a a bit to get most of it straight down to the tip. Some slush on the sides is okay, since that'll wash away next time and I put on't use that syringe. It's basically just a tiny funnel today.
As soon as enough provides gathered at the suggestion, you make use of that syringe to fill up one or more smaller syringes using the widest filling device you have and the dispenser fixed to constant, very reduced pressure air, with no fIoater. With the fIoater you can have got higher air flow stress, but it's a terrible clutter to obtain it out again, because paste will splutter just about everywhere. I have tried it.
Put the floater on the smaller sized syringe, push it in simply because much as you can. If possible allow some air flow get away past its sides. Established it upright a even though. If the paste doesn'testosterone levels flow straight down very willingly in a well closed syringe, heat it up to about 40 degrees G (in the closed syringe the IPA earned't evaporate). As soon as the paste is certainly at the underside, take off the cover and using a straight-forward implement, meticulously drive the floater lower.
How much IPA?:
Today, the quantity of IPA to use is very conditional on your private design and preference, as nicely as filling device dimension and kind. I choose a thicker paste to make nice round minute droplets so I really put in only a few of ml óf IPA and use the conical plastic fine needles. You can fine-tune thickness a little for various hole sizes. The conical guidelines come in extremely small and really large availabilities, so it's difficult not to find something suitable.
If you possess very liquefied paste, it will run out nicer across the entire mat (if you possess a dense solder mask) or not really so properly across your entire PCB (if you have no or very thin solder cover up).
Insert type and width versus suggestion kind:
If you dilute your paste extremely significantly, the conical tip is a bad concept, as it allows lower viscosity fluids to goop out out of control, credited to air-bubble exchange at the suggestion. Keep that in mind. With highly liquid paste you need a steel suggestion, but since it's not therefore viscous any more it won't add so very much resistance either.
Will IPA alter anything in the behavior in the oven?
Possibly, yes. But. In the stove I use, with the normal 63/27 profile over 7 a few minutes I possess found no difference in effectiveness or quality between with ánd without IPA aftér quite extensive assessment on ENIG and HASL planks.
Do manufacturers make various viscosity paste? Yés.
Have I found one mfg that makes various viscosities targeted at various reasons to day? No. But I also haven't tried purchasing straight from a producer who aims at industrial use however, so chances are reasonable the practise will can be found.
With a few hours of practise on combining, filling a few syringes and trying different tips after a while I found that I experienced a few of great information about dishes for paste and the tips and dispenser settings that move with them that suit my private choice down to 0402 / 0.5mm presentation chip mounting.
As a fun point of curiosity, with somewhat more liquefied, but nottoo very muchand a medium sized steel hook I discovered you can simply lie down a slim stripe of pasté across a entire row of fine-pitch VQFN parts, on the outer edge and let it bleed in a tiny little bit to after that have got the chip reflow properly, since solder-másk repels the liquefied solder, which prevents shorts.
Thé striping with relatively heavy paste will trigger undesired solder tennis balls, simply because will any type on bigger pin-gaps. I primarily use the technique on 1.5mmichael pitch and below. If after that a few balls occur, use some IPA ánd a toothbrush tó brush them beautifully apart.
Various other than all of the over it will nevertheless get a few times of practise to obtain everything best for your own personal functioning style and I fully anticipate it to finish up completely in a different way from any method I have got described very soon.
Ré-Use of Syringés:
l elected to purchase 100 units of 10cc syringe + floater + cap and just toss the clear types in a 'recycling' box with the intent of washing and re-using them later on. Perhaps I will clean out the pasté with IPA ánd allow it dried out to make use of once again (if that ends up becoming possible at all). But I have just got 4 vacant types at the second, so I'm not really there however.
The additional syringes furthermore permit you to possess 3 or 4 mixes handy for various kinds of work opportunities, also practical, though I just use 2: A little bit thick and slightly less, but nevertheless quite, thick.
Alternative to lPA
AIl stated and performed, now there's one even more option. Make use of liquid flux to thin the paste. They make use of a heavy goopy paste, like the old rosin in those containers, but without the rosin content material, to make the solder paste. In most situations this mixes quite properly with standard none-water-based water flux. But be aware, most fluxes are either drinking water based or alcohol based, which means it'beds just incorporating IPA in cover, with a few ingredients.
I possess not attempted this for dispensing, just as a combining test, because, hey, I possess a 5 liter jerry can from Multicore anyway.
Air flow pressure and surroundings cIeanliness:
Thé compressor you're also using can become arranged to almost any pressure the dispenser can deal with (up to 8bar at least, as I possess tested this for a good duration), as the front side regulator of this device, in most cases functions pretty nicely down to 0.5bar (I think that to be lt;10PSI, though I'm not sure, because I discover that a foolish device).
It can be however considerably wise, for continuous correct procedure of the reguIator in the unit and the switch over long time, to have a wetness and little particle filter before the dispénser.
Bécause I work on Waver-Stepper components as well for some customers, my set-up includes a 100micron filter and water-catch, adopted by a 5micron filter, with one monitor going directly to my seat after that and one track going through a vénturi-based -10degrees D water separator. (With the choice of adding a low-fIow-rate 0.5 micron filter in your area for the most delicate of products, but I hardly ever use that for ánything)
This can make me very self-confident the point will maintain working for a very, very lengthy time simply because longer as the components change out to end up being at minimum moderately okay (just a several weeks in).
But, l'meters also very happy to state that I believe simply the 100 micron filtration system and drinking water trap (that stage is usually mixed in a individual device) would most likely suffice.
I suspect any of these will assist you keep somewhat cleaner surroundings, if you wish, at Chinese language cost and quality, of course:
Water capture with stress regulator and measure, most likely around 100 micron
40 micron Filter
Inline Chemical substance Dessicator - Will take out even more water, after the 1st water capture, but uses a kind of silica skin gels and will need normal refilling ór drying
40 micron Filter
Inline Chemical substance Dessicator - Will take out even more water, after the 1st water capture, but uses a kind of silica skin gels and will need normal refilling ór drying
- l do not research very nicely, they may become available cheaper.
Edit Even more:
I are today in the procedure of modifying the unit from it'beds 'built in vacuum' to an actual vacuum cylinder hook-up. Thé improvised venturi théy use inside wastes a shit-load of air to create just a small vacuum cleaner. Since I have a vacuum pump motor, I only needed a vacuum cleaner pressure regulator additional, which I have just purchased. So shortly my compressor will stay a great deal cooler under the procedure of this gadget.
The vacuum cleaner regulator is usually required, because the major 0.6bar-below-room-pressure I normally have the series governed to will be strong good enough to suck the plunger back out of the syringe :-Chemical.
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$endgroup$$begingroup$While some have got recommended the use a stencil ovér dispending paste, thére are specific trade-offs where your system will be quicker (and cheaper. although stencils are usually very inexpensive depending on the complexity) than ordering and using a stencil. For instance:
- no incredibly fine frequency parts
- a stencil usually requires cleaning up and established up situations that can end up being prevented by merely dispensing paste onto a handful of planks
- Perform manufacturers make different forms of paste for syringe application vs stencil-and-squeegee software? The paste I purchased from the nearby shop will be by MG Chemical substances, Sn63/Pb37, and arrives in a syringe, so I suppose it's the correct kind for my requirements.
- What's a good percentage of alcohol to paste (supposing Sn63/Pb37)?
- Once I blend the paste and alcohol in a distinct container, what's a good method to obtain the paste intó one of thé syringes without sméaring it all ovér the inside walls? I've believed about pouring all of thé paste into thé dispensing syringe ánd including alcoholic beverages on top of that, but I'michael afraid stirring within the syringe won't mix the mixture homogeneously.
- What's a good tip to make use of on the syringé? The dispenser l bought came with a large test group of different types (steel and plastic material), but none of them worked excellent. The paste is definitely too solid to suit through the metallic types and I discover the opening of the plastic material types to end up being a little too large to end up being precise.
- Random suggestions from Mike's Electronic Things:https://www.youtubé.com/wátch?v=pdGSFc7VjBE
- FeIix Rusu's DIY go with and location $20: https://www.youtube.com/watch?v=YhavXauuWqY
Before l respond to your queries. you said:
including a little isopropyl alcohol helps become softer it more than enough to work 'great sufficiently' with this system
I use isopropyl alcohol to clear flux fróm my PCBs. l've never heard of anyone combining it with théir solder paste. l wonder if there will end up being any harmful implications from including alcohol to your paste blend. Will be the reason you are adding alcohol to make the paste 'leaner' so it arrives out of the device? Have you tried simply waiting around for the paste to heated up?
That getting mentioned, from the way you possess worded your query, it shows up you really detail oriented. This is usually good when it arrives to soldering and dealing with paste as it can become a technological process and almost an art. You will discover that it will be also quite forgiving. As you go along and obtain more experience, you received't be concerned about factors like this (at minimum for doing items by hands and making prototypes. bulk production will be a different game).
To respond to your questions:
Zero. They just make different mixtures of Sn/Pb/other components. You'll discover that your paste should function for most applications.
You'll have to experiment with this on your personal. Also if someone had been to suggest a percentage to you, the alcoholic beverages may dried out up over time. Also, the regularity of the soIder paste will change over period as well as it will get more publicity to air.
<ém>Again, I've by no means heard of anyone mixing alcohol into their pasté. If you had been to do this, I would imagine it would require to be in a larger container and then transferred to the syringé so it has been certainly homogenous.ém>
<ém>This will rely on the dimension of your components. If you are carrying out anything even more complex than a QFP package deal, you'll most likely need a stencil. You might even require a stencil fór a QFP (ór simply be prepared to do some re-wórk with soIder wick by hand). You'll discover that any fairly small suggestion should do the job.ém>
Here are usually some video clips that possess dramatically enhanced my effectiveness:
AntonAnton
$endgroup$$begingroup$If you are usually not really reworking, and reflowing, a component. I would prevent the solder pasté syringe. The pasté ages and dries up and is usually harder to work with than good measure solder cable (as you are usually currently suffering from).
If you are usually placing all this work into upgrading your fab strategies, consider making use of stencils and a wiper technique for appropriate quick software of the solder, mainly because properly as paste that will not need 'prep' function or mixing up with alcohol.
The creator community can be beginning to choose up on stencil reducing with laser etching and identify some links for suitable soIder.
SoIder: http://www.digikéy.com/product-séarch/en?mpart=7016070520amp;vendor=117
Stencils: https://www.sparkfun.com/tutorials/58
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