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goes beyond a simple teardown and has decapped the controller IC to see what lurks inside, and the result is shown here. The design is as cheap as it is clever in its cost-cutting. A wirewound resistor apparently also serves as a fuse, just in case. The electrical components inside this glowing model of cost-cutting consists of one PCB ( previously-seen dollar store LED bulb examples had two), eleven LEDs, one bridge rectifier, two resistors, and a controller IC.
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This teardown of a recent dollar store example shows that cost-cutting has managed to shave even more off what was already looking like a market saturated with bottom-dollar design. has done a lot of LED light bulb teardowns over the years, witnessing a drive towards ever-cheaper and ever-simpler implementations, and suspects that LED light bulb design has finally reached its ultimate goal. Posted in cnc hacks Tagged AliExpress, cnc, cost, price, spindle, testing, tool holder, vibration If you are looking for some other ideas in setting up an inexpensive CNC machine, you might also like to look at BLDC motors from a remote control vehicle. Without some skills in troubleshooting he might have returned the entire machine unnecessarily. Luckily was able to get a refund on the tool holders since they were out of spec, but still has a quite capable spindle on his hands for an excellent price. The suspected part causing the vibration was the tool holder, so after checking the machine’s runout and also using a specialized vibration sensor this was confirmed to be the case. But at around 8000 rpm the machine would begin shaking. Even the variable frequency drive, which was programmed at the factory, was working properly. Upon delivery of the spindle, everything seemed to work correctly out-of-the-box. While the delivered product seemed fine, there were some problems that needed investigations. In the case of ’s planned CNC machine build, he took the more adventurous idiom of “no risk, no reward” to heart when he purchased these spindles for the machine from AliExpress. The old saying “you get what you pay for” is a cautionary cliché, but is directly contrary to several other common sayings.