| Electronics > Beginners |
| Plunger, needle tip & cap for flux & solder paste syringe - where / which to buy |
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| Rooster Cogburn:
This is just a such a stupid problem :) I think a very good point made by Ian.M is that there's no standard way to attach the plunger to the piston. So there'll be no way to actually pull back on the plunger, and in my experience that's pretty useful with any syringe dispensing viscous gel. And harvesting plungers from existing syringes is also probably nasty because they generally don't just come out, and as Ian.M said, pushing onto the piston with some kind of cut-off plunger might wedge/flip the piston. And it seems you can't easily buy plungers, except by buying Chinese flux with plungers and throwing the flux away :( Like this: https://www.ebay.de/itm/Mechaniker-UV-Hartbare-Lotmaske-Loten-PCB-Reparatur-Grune-Farbe-10cc-Plunger/192437551673?hash=item2cce2c0239:g:QN0AAOSweLBaacbo Also, why are these female-female couplers so expensive? ;-) The Amtech business strategy: "Let's make our product very hard to buy and then ship it in a container that requires hours of hunting down accessories on AliExpress to actually get something out" |O I'm beginning to think the best strategy here is to buy a selection of tips, a few syringes and a luer lock coupler. Probably quite OK for the flux but I'm a bit worries about the thicker solder paste. |
| nanofrog:
--- Quote from: Rooster Cogburn on April 29, 2018, 03:20:35 pm ---Also, why are these female-female couplers so expensive? ;-) The Amtech business strategy: "Let's make our product very hard to buy and then ship it in a container that requires hours of hunting down accessories on AliExpress to actually get something out" |O I'm beginning to think the best strategy here is to buy a selection of tips, a few syringes and a luer lock coupler. Probably quite OK for the flux but I'm a bit worries about the thicker solder paste. --- End quote --- Regarding the couplers, my guess is that they're not all that common, so no small quantities are available (sold by the case = too expensive for our purposes). And although the stainless steel model is expensive initially (~$9 shipped to you), it's not disposable so you only have to purchase the one. It does require cleaning though (bit of a PITA, but livable IMHO). Not sure why genuine Amtech products are so hard to find, but I've always avoided them due to this issue (almost certain I'd get a fake). :-// As a result, I've stuck with Kester RF741 flux (good stuff). Given your location, I'd think Henkel/Loctite products should be readily available to you. The steel needles would be fine with the flux, but are much more difficult to use with solder paste. This is where the plastic conical tips come in handy as they're a LOT easier to push solder paste out (you don't have the bottleneck right at the Luer Lock tip you do with the metal ones). So if you can get some 30ml syringes at a reasonable price, go for it. Just be sure to get the plastic conical tips for solder paste, and you'll be fine. As per a dispenser, the Manual Syringe Gun seems to be the way to go (nice balance of cost/performance @ $30 shipped). |
| Rooster Cogburn:
Those http://www.adhesivedispensers.co.uk/handplungers.htm things look fantastic, but WTF prices... I've been using alcohol no-clean with low solids so far as it's reasonably effective and leaves very little residue that's trivial to clean, but I wanted to give gel flux a shot. I bought some of this: https://www.amazon.de/MG-Chemicals-No-Clean-Flussmittelpaste-Spritze/dp/B00425FUW2 It's fantastic. Comes it a syringe, ready to use, even has a cap (mind-blowing!). I love how I don't constantly have to re-apply flux. When working out solder bridges or when working on a board that's heated from a hot air station etc. the alcohol based no-clean is just gone after seconds. The downside of the MG Chemicals stuff is that it's pretty much the stickiest substance one earth. I feel I have to wipe down the PCB with alcohol 5x and then it's still sticky. It gets on your fingers, makes parts stick to your tweezers, your ESD mat gets gunky. Supposedly the Amtech stuff is better. I'd like to buy some Amtech from the European distributor and compare, but first I have solve the 'syringe issue'. |
| nanofrog:
Do you know someone with a 3D printer? Maybe bring a 12pk of beer you can share while waiting on it to finish. ;D |
| Rooster Cogburn:
So I bought an assortment of syringes, needles & a f-to-f coupler. I'll report back in a month if this worked out :) Thanks a lot for your suggestions! |
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