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Why Cordless Rotary Tools Sag Mid-Battery
When a Dremel 7760's micro USB port dies mid-engraving batch, it kicks off a deeper question: why do cordless rotary tools feel weaker as the battery drains, and can even premium Makita or Bosch systems buy their way out of it? This episode digs into battery internal resistance, brushed versus brushless motors, and the control loops that try — and ultimately fail — to hold RPM steady. Then it flips the question: if the wall outlet isn't pristine either, what combination of power supply and motor circuitry actually gets closest to pure, consistent power delivery? The answer involves a tradeoff…
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