Bachin Stepper Motor 4240-15a [new] < Easy >

Ready to integrate the Bachin 4240-15A into your next build? Double-check your driver’s Vref, grab a multimeter, and start prototyping. Precision motion is just a step away.

void loop() // 200 steps = 1 revolution for(int i = 0; i < 200; i++) digitalWrite(STEP_PIN, HIGH); delayMicroseconds(1000); // 500 µs low + 500 µs high = 1 ms period = 1000 steps/sec = 300 rpm digitalWrite(STEP_PIN, LOW); delayMicroseconds(1000); bachin stepper motor 4240-15a

To decide if this is the right motor for your project, you need to look beyond the label. Here are the empirical specifications usually associated with the Bachin 4240-15A: Ready to integrate the Bachin 4240-15A into your next build

| Specification | Typical Value | Why it matters | | :--- | :--- | :--- | | | 1.8° ± 5% | Standard 200 steps per revolution. Easy integration with common drivers. | | Holding Torque | Approx. 4.0 – 4.5 kg·cm (55 – 63 oz·in) | High for a 40mm motor. Can drive lead screws and smaller belts effectively. | | Rated Voltage | 3.6V – 4.2V | Low voltage per phase; requires a chopper drive (not constant voltage). | | Phase Resistance | 2.4 – 2.8 Ω per phase | Low resistance allows for high current. | | Phase Inductance | 3.0 – 4.5 mH | Moderate inductance means decent torque at moderate speeds (200-500 RPM). | | Rotor Inertia | Approx. 54 g·cm² | Low inertia allows quick start/stop movements. | | Weight | 360g – 400g (0.8 lbs) | Light enough for extruders, heavy enough for stability. | void loop() // 200 steps = 1 revolution

⚠️ Actual values may vary slightly. Always verify with a multimeter before connecting to a driver.

Whether you are a hobbyist building a desktop mill or an engineer prototyping an automated linear stage, understanding the specifications, wiring, and application of this specific motor is critical. This article dives deep into everything you need to know about the Bachin 4240-15A.