270:1 Metal DC Geared-Down Motor 37Dx72.5L mm 6V/12V, with 64 CPR Encoder and Bracket. 6V-3W-20RPM-40 kg.cm(556 oz.in), 12V-6W-40RPM-70 kg.cm(972 oz.in), D-Shaped Output Shaft 16mm.

270:1 Metal DC Geared-Down Motor with 64 CPR Encoder + Bracket - 6V/12V, 37×72.5 mm (1.46"×2.85"), D-Shaft 6 mm, 16 mm Long (Pack of 1)
✔️ 270:1 Metal DC Geared-Down Motor with Encoder & Bracket (Pack of 1)

This 270:1 metal DC geared-down motor (Ø37 mm x 72.5 mm long) comes complete with a 64 CPR encoder and a sturdy metal mounting bracket kit. It features a D-shaped 6 mm output shaft (Ø6 mm, 16 mm long) for secure coupling, dual-voltage operation (6 V or 12 V), and robust torque suitable for precise, low-speed motion in robotics, measurement devices, medical equipment, RC cars, smart home gadgets, and DIY servo builds. It’s compatible with Arduino and similar microcontroller platforms for straightforward control integration.

✅ Gear ratio: 270:1
✅ Frame size: Ø37 mm x 72.5 mm L (Ø1.46" x 2.85" L)
✅ Output shaft: D-shaped, Ø6 mm (0.24"), length 16 mm (0.63")
✅ Voltage: 6 V / 12 V
✅ No-load speed: 20 RPM @ 6 V; 40 RPM @ 12 V
✅ Stall torque: 40 kg cm @ 6 V; 70 kg cm @ 12 V
✅ Power: 3 W @ 6 V; 6 W @ 12 V
✅ Encoder: 64 CPR
✅ Bracket: Included metal mounting bracket kit
✅ Controller compatibility: Arduino-compatible boards and common microcontroller platforms

Dimensions
Motor: Ø37 mm x 72.5 mm (Ø1.46" x 2.85" L)
Shaft: Ø6 mm x 16 mm (Ø0.24" x 0.63" L)
Shaft length: 16 mm (0.63" L)

💡 What are the practical implications of using this 270:1 metal DC geared-down motor with a 64 CPR encoder in an Arduino-based robotics project, and how does dual-voltage operation affect control strategy, power budgeting, and system reliability in real-world applications?

Short answer: It delivers precise, torque-rich motion with encoder feedback, and dual-voltage lets you balance speed and torque while keeping power usage predictable.

• At 6 V: about 20 RPM no-load, up to 40 kg cm of torque; roughly 3 W draw, ideal for slow, accurate movements like gripper actuation or joint positioning.
• At 12 V: about 40 RPM no-load, up to 70 kg cm of torque; up to 6 W, enables faster, stronger actuation while maintaining control with the 64 CPR encoder.
• The encoder provides position feedback suitable for simple PID or open-loop improvements on common microcontrollers, improving repeatability and repeatable motion profiles.
• The included bracket and D-shaped shaft provide rigid mounting and reliable coupling, reducing slippage and vibration in compact robotics or RC platforms.