Have you ever seen soldering this close? [video]

Original Article ↗ Hacker News Discussion ↗

Microscopes and Imaging

  • Video was recorded with a Keyence VHX‑7000N microscope; commenters praise its image quality, depth of field, and live 3D modeling.
  • Reported prices range roughly from $45k to $85k+; quote-only pricing and aggressive sales tactics are criticized.
  • Seen as fantastic for inspection but lacking an API, requiring manual operation.
  • Hobbyist alternatives: stereo zoom AmScope and generic Meiji‑style clones ($400+), cheaper HDMI/USB scopes ($100–$200), and even very cheap “pore cleaner”/USB microscopes; ring lights and sturdy boom stands are strongly recommended.

Reflow and Soldering Techniques

  • Hot plates and toaster ovens are commonly used for reflow at home; some argue temperature profiling is important, others report success with simple “turn to max, watch, and switch off” approaches.
  • Hot plates can let SOICs and other packages self-align; people also use hacked toaster ovens, hot air guns, and commercial reflow ovens.
  • Applying solder paste without a stencil is widely described as difficult and messy; needles, dental tools, and acupuncture needles are suggested.

Self‑Alignment, BGAs, and Small Parts

  • Surface tension during reflow can self-center BGAs, QFNs, and many SMT parts if pads and solder amounts are correct.
  • BGAs can self-align “all or nothing,” but misalignment can still occur in practice due to board or package issues; X‑ray is sometimes needed to detect defects like bridging or “head‑in‑pillow.”
  • Very small passives (e.g., 0402) can tombstone due to strong surface tension forces, especially compared to 0204.

Solder, Flux, and Paste

  • Solder paste particle size is a tradeoff: finer powders needed for very fine pitch but increase surface area, oxidation, cost, and “balling.”
  • Strong emphasis on using plenty of flux; many consider insufficient flux the main failure mode.
  • Heated debate over leaded vs lead‑free: some find lead‑free “almost impossible” for hobbyists, others report minimal difficulty with good flux and temperature control.
  • Tip life is worse with lead‑free; brass wool and regular tinning help.
  • Lead in fumes is said to be negligible; flux fumes (especially with lead‑free) are the main concern, so some use fans or extraction.

Tools and Home Lab Setups

  • Basic home setup: temperature‑controlled iron, thin solder wire, flux pen, tweezers, multimeter; later add hot air, reflow (toaster) oven, microscope, and measurement gear.
  • Cheap reflow and inspection solutions are seen as making serious SMT and even BGA work feasible at home.

State of Hand Soldering

  • Some claim hand soldering is a “dying art,” but many strongly disagree, citing ongoing use in prototyping, rework, repair, and hobbies.