PG Series Gearboxes

The Planetary Gearbox (PG) series of gearboxes and gearmotors feature robust planetary gearing inside paired with reliable motors. You asked for it, we delivered. This gearbox now features two hex output shaft options to easily attach to 3/8 in. or 1/2 in. hex bore wheels, sprockets, and other motion products without the need for adapters.

The PG Series of Planetary Gearboxes are designed for the following motors for the specific ratios RS775-125 Motor, with Encoder For PG27 Gearbox and RS775-5 Motor, with Encoder For PG71 and PG188 Gearbox, or the AndyMark 9015 Motor using a Hardware Kit for PG 71 and 188 Gearbox with Pinion Gear for 9015 Motor

PG Gearmotor Part Numbers (click below to select by part number):

• PG27 with 3/8 in. hex output: am-3651
• PG27 with 1/2 in. hex output: am-3654
• PG71 with 3/8 in. hex output: am-3652
• PG71 with 1/2 in. hex output: am-3655
• PG188 with 3/8 in. hex output: am-3653
• PG188 with 1/2 in. hex output: am-3656

Useful Additional PG Parts:

• Mounting a PG to a frame, Motor Mount Bracket (am-2197)
• Adapting the old 10 mm PG shaft to a 1/2 in. round geometry with a 1/8 in. key, PG Shaft to 1/2 in. with 1/8 in. Machine Key Adapter (am-0996)
• If an old 10 mm shaft becomes damaged you can replace it with, 4 mm x 12 mm Machine Key (am-1249)

Physical Specifications Common Among all PG Series Gearboxes:

• Pre-Lubricated Gear Material: Steel and Plastic
• Body Material: Steel
• Input Voltage: 12 Volt DC
• Mounting Holes: 4 x M4-0.7 on 35 mm Bolt Circle, AND 4x #10-32 on 2 in.  Bolt Circle.

PG977 Specifications:

• Gearbox Reduction: 977:1
• No Load Free Speed: 6.4 RPM
• Damaging Torque*: 30 ft/lbf
• Minimum Backdrive Torque: 14.5 ft/lbs

PG516 Specifications:

• Gearbox Reduction: 516:1
• No Load Free Speed: 11 RPM
• Damaging Torque*: 30 ft/lbf
• Minimum Backdrive Torque: 7 ft/lbs

PG188 Specifications:

• Gearbox Reduction: 188:1
• No Load Free Speed: 28 RPM
• Damaging Torque*: 30 ft/lbf
• Minimum Backdrive Torque: 3.5 ft/lbs

PG71 Specifications:

• Gearbox Reduction: 71:1
• No Load Free Speed: 75 RPM
• Stall Torque: 16.6 ft/lbf
• Minimum Backdrive Torque: 1.3 ft/lbs

PG27 Specifications:

• Gearbox Reduction: 26.9:1
• No Load Free Speed: 198 RPM
• Stall Torque: 6.3 ft/lbf
• Minimum Backdrive Torque: 0.3 ft/lbs

Encoder Specifications:

• Pulses Per Revolution: 7
• Operating Voltage: 5VDC
• Pinout:
• Pin 1: 5Vdc
• Pin 2: Gnd
• Pin 3: Encoder Output Cha. A
• Pin 4: Encoder Output Cha. B

Note: Because the encoder is connected to the back of the motor shaft, the rotation is backwards from normal front mounted encoders so you will need compensate for this in software or simply connect Ch. A output to your Ch. B input and Ch. B output to your Ch. A input.

FRC Parts Legality
The following gearmotors (gearbox + motor) contain or have contained motors with part numbers that have been deemed legal for the 2020 FIRST Robotics Competition Season: am-0576, am-0586, am-0629, am-0914, am-0915, am-0939, am-2082, am-2083, am-2084, am-2161. am-2193, am-2193, am-2194, am-2389, am-2542, am-2549, am-2550, am-2765, am-2766, am-2923, am-2924, am-2937, am-2938, am-2971, am-3108, am-3109, am-3183, am-3651, am-3652, am-3653, am-3654, am-3655, am-3656
Variants of these part numbers that include additional letters are also legal.

*If stalled these gearboxes are capable of breaking themselves and should only be used to reduce speed, not increase torque past 30 ft lbs