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Cake day: July 15th, 2023

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  • Not quite, conductor diameter is important to supply proper current, which will change depending on the impedance of your speaker. There are other values like inductance and capacitance in a wire that could affect how your speaker sounds. The good news is that you can pretty much buy any cheap 16 ga copper speaker wire and not worry about it, as it would take effort to make a speaker wire that sounds bad (and those companies are the type to try to charge you $1000/ft for it!)


  • Im not a coating scientist (I’m a design engineer) so I can’t really answer your questions in detail. But powder coats are typically polyurethane or polyester. There are different types of wet paints as well. Some surfaces also get an additional UV top coat for abrasion resistance.

    For a phone button you might be looking at something like PVD coatings or platings. Chromating wouldn’t be used in those cases as it is not terribly durable but it provides a good surface for the coating that goes on top or it. All of thses coatings are on the scale of a few mils thickness.

    Most of these finishes are done on industrial scales and even the manufacturers send them out to external places for finishing (e.g. in Asia that type of facility is strictly controlled for environmental reasons) . At the end of the day I just speak with my supplier and tell them the finish I want and they take care of the rest.


  • For die casting, it is post processing. After the part comes out of the mold there is the sprue, overflow tabs, and flash (extra material at the parting line) that needs to be cleaned up. Then the parts are often chromate conversion coated and then finished with either a wet paint or powder coat. Plating is also an option.

    For injection molding, parts typically come out of the mold fully finished (or just requiring gate removal). The vast majority of parts are only textured where the final finish is part of the mold. You can do anything from a high polish to rough textures, or even any crazy pattern or simulated material you can imagine. For graphics you can apply in-mold decoration where a film is placed in the mold before the plastic is injected. There are some post processing finishes that are pretty frequently done such as wet painting and plating.






  • The article more or less covers it. Asian countries without a credit card culture mostly transitioned to QR because it was easy with minimal equipment changes required. Those with widespread credit cards accept tap and QR (e.g. Taiwan widely accepts QR payments, Google pay, Apple pay, credit cards, and transit cards).

    Since the western world has been on credit cards for decades that is the solution that is accepted there with QR payments being almost exclusively in businesses that have a customer base from Asian countries. Even then the US is odd compared to other countries since they never really adopted chip and pin.