By golly, look at the build quality of this homemade spot welder.
Just about everyone on here knows it’s quite possible to build one of these things using a re-wrapped microwave transformer, but they’re usually made of wood like the one we swap on Friday, and we often wonder how much real use they get other than “hey look I built a spot welder!”. I myself made one, but then ended up buying a professional one because it works better. Not [Matthew Borgatti] though, his looks better and has more features than even the one I bought!
Why? Because he put some serious thought into his design. He even 3D modeled the whole thing in SolidWorks.
Beyond the excellent laser cut enclosure (complete with ratcheting work piece clamping), [Matt’s] also added an Arduino to create a timing circuit. Most times you just squeeze the clamp, press the button, and watch the metal heat up — “I think that’s good…”
But with an actual timing circuit you can calculate how much time you need versus current and electrode size to produce a good quality weld.