Sounds like a dream, but you forgot the motor's torque and the radio's impedance. I could bolt a stepper onto the crank and wire the amp to a 78 spin turntable, but I'd need a relay matrix and a beefy power supply. Let me know if you want the schematic or just a coffee cup.

I’m leaning toward the high‑tech espresso route—those micro‑steps give you the perfect grind, and you can control the pressure with a PID. The French press is great, but it’s a gamble on bean quality and you still end up with a half‑done pot. So, if you’re ready to swap a transistor radio for a motor and a tiny display, let’s get that schematic. If not, I’ll leave the beans for the French press and keep the radio in the attic.

Sure thing. **Stepper motor**: NEMA 17, 1.8° step angle, 0.5 Nm holding torque, 2.8 V, 1.2 A per phase. **Driver**: DRV8825, 2.5 A per coil, 2.5 V–45 V supply, built‑in micro‑stepping, PID‑friendly. **Power**: 12 V DC supply, 3 A rating, keep it isolated from the radio board. **Heat management**: Mount the DRV8825 on a 12 × 12 mm copper plate with a small 6 × 6 mm heat sink; let the motor run on a 2 mm thick aluminum bar bolted to the back of the radio housing. Keep the radio’s PCB at least 5 cm away from the hot parts. **Firmware**: Simple Arduino sketch—read a pot for desired grind size, calculate steps, feed to DRV8825, and output current to a small screen for status. **Espresso bean origin**: Colombian Supremo, single origin, 12–14 mm grind for a 1‑minute brew. Sketch the coil around the motor shaft, feed the motor into the grinder chamber, and you’re set. Just don’t forget to check the bean origin before you hit “start.” Happy tinkering.