The metal gear D645MW is part of Hitec’s D-Series dynamo servo line. All Hitec D-Series servos have been designed using their cutting edge, custom engineering. Combining industry leading high-resolution, state-of-the-art ultra-response technology with a 32-bit MCU, and a 12-bit ADC for unprecedented programmability and flexibility. These servos deliver significantly smoother movement. The speedy, powerful line operates on a wide 4.8 ~ 8.4 voltage range, allowing use with any common battery chemistry without the need for adapters or regulators. Featuring Hitec’s industry standard 25-tooth output spline with an M3 pan head with a phillips drive style, each D-Series servo brings monster performance never known before in the market.
The answer to this question is partially dependant on what you are using to control the servo.
Click for a quick video explanation.
With an Average Radio System:
Your average transmitter and receiver will output a relativly narrow PWM signal range.
Radio System + Servo Stretcher:
Adding a Servo Stretcher to your radio system setup will allow you to achieve wide PWM signal ranges.
Wide Signal Controllers:
Controllers such as the Actobotics® Servo Controller, Arduinos, and Raspberry Pi servo hats can usually send a wide signal.
|Output Shaft Style||H25T Spline|
|Voltage Range||4.8V - 8.4V|
|No-Load Speed (7.4V)||0.17 sec/60°|
|No-Load Speed (4.8V)||0.28 sec/60°|
|No-Load Speed (6.0V)||0.20 sec/60°|
|Stall Torque (4.8V)||115.3 oz-in (8.3 kg.cm)|
|Stall Torque (6.0V)||157.8 oz-in (11.3 kg.cm)|
|Stall Torque (7.4V)||180.1 oz-in. (12.9 kg.cm)|
|Max PWM Signal Range||750-2250μsec|
|Travel per µs (Stock)||.080°/μsec|
|Max Rotation (Stock)||120°|
|Operating Temperature||-20°C to +60°C|
|Continuous Rotation Modifiable||Yes|
|Direction w/ Increasing PWM Signal||Clockwise|
|Motor Type||3 Pole Ferrite|
|Feedback Style||5KΩ Potentiometer|
|Output Shaft Support||Dual Ball Bearings|
|Wire Length||11.81" (300mm)|