Mechanical design

Servos

We started with the Futaba, but found out it was really unpowered and switched to the Tower MG995...

Futaba S3003 Servo Standard

• Control System: +Pulse Width Control 1520usec Neutral
• Required Pulse: 3-5 Volt Peak to Peak Square Wave
• Operating Voltage: 4.8-6.0 Volts
• Operating Temperature Range: -20 to +60 Degree C
• Operating Speed (4.8V): 0.23sec/60 degrees at no load
• Operating Speed (6.0V): 0.19sec/60 degrees at no load
• Stall Torque (4.8V): 44 oz/in. (3.2kg.cm)
• Stall Torque (6.0V): 56.8 oz/in. (4.1kg.cm)
• Operating Angle: 45 Deg. one side pulse traveling 400usec
• 360 Modifiable: Yes
• Direction: Counter Clockwise/Pulse Traveling 1520-1900usec
• Current Drain (4.8V): 7.2mA/idle
• Current Drain (6.0V): 8mA/idle
• Motor Type: 3 Pole Ferrite
• Potentiometer Drive: Indirect Drive
• Bearing Type: Plastic Bearing
• Gear Type: All Nylon Gears
• Connector Wire Length: 12"
• Dimensions: 1.6" x 0.8"x 1.4" (41 x 20 x 36mm)
• Weight: 1.3oz. (37.2g)

Tower MG995

• Dimensions: 1.57" x 0.79" x 1.44" (40 x 20 x 36.5mm)
• Weight: 1.78oz (48g)
• Operating Speed (4.8V no load) : 0.17sec / 60 degrees
• Operating Speed (6.0V no load) : 0.13sec / 60 degrees
• Stall Torque (4.8V): (13kg/cm) (180oz/in.)
• Stall Torque (6.0V): (15kg/cm) (208oz/in.)
• Temperature Range: -30 to +60 Degree C
• Dead Band Width: 4usec
• brown= negative , orange =signal, red= positive