this post was submitted on 11 Jun 2024
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ErgoMechKeyboards

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I’m joining the split keyboard group by building a piantor. I have the pcbs already and they’re lead free coated and I will use lead free solder on the components.

I’m a bit worried though as I used a borrowed split and I noticed I keep touching the soldering in the microcontroller quite a bit and the build I was going for was a bare one where we just put rubber feet directly in the pcb so there’s no case or anything.

I tend to rub my eyes and bite my nails quite a bit during the day. I was wondering if it’s safe enough on lead free solder or if this is something I should completely avoid.

Any suggestions in case I should avoid it entirely. I reckon the worst place would be the top of the pcb maybe I can use some hot glue where the solder is but I have no idea if it’s hard to pull it off later if I need to review/resolder.

This is my first project and I haven’t done anything like this before, so even the flux I’m kind of unaware how to clean, solder comes with it right, do I need to wipe it somehow or use isopropyl alcohol and wipe with maybe a paper towel?

Sorry about being a complete noob. I searched around but most people are concerned about the lead solder not lead free like me.

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[–] jet@hackertalks.com 5 points 5 months ago (7 children)

These are great questions!

I'm going to break down my response into two sections:

  • Building the machine

Don't breathe flux, if you can do your soldering outside. If you can't, put an extraction fan by your workstation, so the fumes don't get inhaled. If you want to be extra safe, wear a face mask, and gloves will soldering and working with the chemicals. When you're done working on the board wash your hands thoroughly

  • Using the machine

If you know the entire build process is lead-free, I don't see any issues of touching the board during daily use. If you're not sure if it's entirely lead-free, you can put a chloroformal coating on top of the board, usually used for waterproofing, but that'll prevent you from having direct contact with any of the heavy metals. You can use hot glue as well. Chloroformal codeine can be dissolved later if you need to redo a joint

  • Advice on solder

Unless you're a large manufacturing laboratory, it kind of sucks to work with lead-free solder, you have to use higher heats, it requires more technical skill. Especially if you're new to soldering, I would recommend using leaded solder anyway. Just don't breathe it, don't touch your face, wash your hands after. The lower temperature will give you a higher chance of success.

In either circumstance, get a practice old circuit board, desolder and solder things until you're comfortable with your heat management. You want to use the least amount of heat will still getting the job done

[–] Merlin@lemm.ee 3 points 5 months ago (6 children)

Thank you very much for answering.

I believe the pcb is lead free as I got it from jlcpcb and they have it written in the package of each side that they’re lead free. The solder itself is also lead free from a reputable electronic store near where I live so I think it should be safe. I live in an apartment so it will be tricky to do it outside, I may try to solder it where my cooktop is as I can turn on the range hood to suck the bad air up.

Do I need to clean the flux that comes with the solder or it’s not that big of a deal? I’d expect that touching it when dry would be safe as well right?

[–] steersman2484@sh.itjust.works 3 points 5 months ago (1 children)

The problem with flux is that it is corrosive. If you use just the flux in the solder it shouldn't be much of a deal, but if you use more flux I recommend washing it off.

I use 99.9% Isopropanol or an ultrasonic cleaner with water for this. If you use water do not use soap or anything else just water. Also make sure it is completely dry before connecting to power.

[–] Merlin@lemm.ee 3 points 5 months ago

Oh. Thanks. I’ll use the flux in the solder only. I’m quite a noob at that so I just got the soldering iron and the solder. I will see about getting the alcohol and use a toothbrush to clean it off after.

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