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3 CIM Ball Shifter

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The ultimate FRC drivetrain gearbox. Ball-lock shifter enables seamless “on-the-fly” shifting at full speed in a compact, light & durable package.

  • Uses a long or short v2 shifter shaft
  • Use with one, two, or three CIM-style motors
  • Configurable Reduction & Shifter Spread Options
  • Designed specifically for the FIRST Robotics Competition, Battle Tested by Champions

If you require help building your Ball Shifter, hover over each of the underlined headers below for more information.

The 3 CIM Ball Shifter ships disassembled. Please grease before assembly.

Note: A pneumatic shifting cylinder and fitting kit is not included in the 3 CIM Ball Shifter kit. Be sure to add these below in the "Pneumatic Cylinder & Hardware" category if needed.

 

 

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VEXpro Ball Shifters provide a battle-proven 2-speed gearbox for easy integration into any FIRST ® Robotics Competition robot drivetrain. The 3 CIM Ball Shifter is the ultimate solution for a two-speed transmission in a competition robot. By utilizing a ball-lock style shifter, this gearbox is capable of “on-the-fly” shifting even when at full throttle. The VEXpro 3 CIM Ball Shifter includes mounting for one, two, or three CIM-style motors.

The Ball Shifter’s lightweight plastic housing includes several features for face mounting as well as hex-nuts embedded in its sides which allow for edge mounting. The housing includes internal features which will keep motor screws from dropping inside the gearbox while they’re being installed.

Every aspect of this transmission was designed with size in mind; this puts a 2-speed transmission into a tiny, lightweight form factor. The ball lock shifting method reduces the gap between the two gear reductions and allows for an extremely narrow assembly. The gear reductions were specifically chosen to reduce the overall transmission size and complexity while remaining highly efficient due to the AGMA 11 quality gears with teflon infused ceramic coating.

Multiple gearing options allow users to change the shifting spread between high & low gears to one of three options: 2.16x, 2.65x, and 3.68x.

The 3 CIM Ball Shifter comes standard as a 2-stage gearbox, but includes options for designers to include a 3rd gear stage for larger reductions; in this setup designers can also customize the overall gearbox ratio by choosing between four different 3rd stage gearsets (64:20, 60:24, 54:30, 50:34).

The 3rd stage output plate is shaped to allow for configurations in which wheels are directly mounted on the gearbox output shaft. This makes this gearbox well suited for West Coast-style drivetrains.

 

  • Designed for up to three CIM-style motors or gearboxes
  • Ball-lock shifter method enables smooth shifting, even at full speed
  • Housing is completely enclosed - keeps metal chips out, grease in
  • Face mount using standard mounting holes
  • Side mount using the embedded hex nuts for easier integration into your design
  • Assembly Required, see instructions below

Initial Stage: 50:12

High Gear Stage: 34:50

 

Low Gear Stage Option 1 (2.16x Shifter Spread): 50:34

Low Gear Stage Option 1 (2.65x Shifter Spread): 54:30

Low Gear Stage Option 1 (3.68x Shifter Spread): 60:24

 

3rd Stage Option 1: 64:20

3rd Stage Option 2: 60:24

3rd Stage Option 3: 54:30

3rd Stage Option 4: 50:34

Standard 3-Stage Configuration (217-3268)

WCD 3-Stage Configuration
(217-3269)

The 3 CIM Ball Shifter includes the option to come in a "West Coast Drive" (or "WCD") configuration. This style features additional space for a set of sprockets or pulleys to be contained within the gearbox assembly itself, bringing them close to the drive frame and making it easy to create a "West Coast"-style cantilevered drivetrain.

The 3 CIM Ball Shifter 3rd Stage Kit can be used to upgrade an existing 2 Stage Ball Shifter to a 3 Stage version.

  2.16x Shifter Spread 2.65x Shifter Spread 3.68x Shifter Spread
3rd Stage Gear Pair High Gear Overall Reduction Low Gear Overall Reduction High Gear Overall Reduction Low Gear Overall Reduction High Gear Overall Reduction Low Gear Overall Reduction
64 to 20 9.07 : 1 19.61 : 1 9.07 : 1 24.00 : 1 9.07 : 1 33.33 : 1
60 to 24 7.08 : 1 15.32 : 1 7.08 : 1 18.75 : 1 7.08 : 1 26.04 : 1
54 to 30 5.10 : 1 11.03 : 1 5.10 : 1 13.50 : 1 5.10 : 1 18.75 : 1
50 to 34 4.17 : 1 9.01 : 1 4.17 : 1 11.03 : 1 4.17 : 1 15.32 : 1
NO 3rd Stage 2.83 : 1 6.13 : 1 2.83 : 1 7.50 : 1 2.83 : 1 10.42 : 1


The VEXpro 3 CIM Ball Shifter provides three different shifter spread options to teams. These options were chosen specifically to serve the needs of FIRST ® Robotics Competition designers. When designing an FIRST ® Robotics Competition drivetrain, teams typically try to ensure that the robot low-gear can survive a continuous pushing match (with high traction wheels) without tripping breakers. They then choose a high-gear which is "fast" enough to zip around the field, without being uncontrollable or accelerating too slowly.

The three options provided allow teams to find a balance which makes their high gear as fast as they want it, and gives their low gear as much torque they need.

3 CIM Ball Shifter Base Kit (217-3195)
(1) 3 CIM Ball Shifter Housing Kit (217-3250)
(1) 50t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-3571)
(1) 3 CIM Ball Shifter Hardware Kit (217-3267)
(1) Ball Shifter Pneumatics Kit v2 (217-4252)
(1) Shifter Bearing Kit
(1) Ball Shifter Encoder Hardware Kit (217-1718)

3 CIM Ball Shifter Base Kit with 3rd Stage (217-3268)
(1) 3 CIM Ball Shifter Housing Kit (217-3250)
(1) 50t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-3571)
(1) 3 CIM Ball Shifter Hardware Kit (217-3267)
(1) 3rd Stage Hardware Kit (217-3638)
(1) Ball Shifter Pneumatics Kit v2 (217-4252)
(1) Shifter Bearing Kit
(1) Ball Shifter Encoder Hardware Kit (217-1718)

3 CIM Ball Shifter Base Kit with WCD 3rd Stage (217-3269)

(1) 3 CIM Ball Shifter Housing Kit (217-3250)
(1) 50t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-3571)
(1) 3 CIM Ball Shifter Hardware Kit (217-3267)
(1) 3rd Stage WCD Hardware Kit (217-3639)
(1) Ball Shifter Pneumatics Kit v2 (217-4252)
(1) Shifter Bearing Kit
(1) Ball Shifter Encoder Hardware Kit (217-1718)

Long Shifter Shaft 2.16 Ratio Spread
(1) Long Shifter Shaft 2.16 Ratio Spread (217-3290)
(1) 34t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-3211)

Long Shifter Shaft 2.65 Ratio Spread
(1) Long Shifter Shaft 2.65 Ratio Spread (217-3291)
(1) 30t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-3210)

Long Shifter Shaft 3.68 Ratio Spread
(1) Long Shifter Shaft 3.68 Ratio Spread (217-3292)
(1) 24t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-2703)

Short Shifter Shaft 2.16 Ratio Spread
(1) Short Shifter Shaft 2.16 Ratio Spread (217-3287)
(1) 34t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-3211)

Short Shifter Shaft 2.65 Ratio Spread
(1) Short Shifter Shaft 2.65 Ratio Spread (217-3288)
(1) 30t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-3210)

Short Shifter Shaft 3.68 Ratio Spread
(1) Short Shifter Shaft 3.68 Ratio Spread (217-3289)
(1) 24t Aluminum Spur Gear (20 DP, 3/8" Hex Bore) (217-2703)

Gears - 7075 T6 Aluminum with Teflon infused ceramic coating
CIM Input Gear - 4140 Steel
Shafts - 7075 T6 Aluminum
Shifter Housing - Glass-filled Nylon

Base Kits:
217-3195 - (3 CIM Ball Shifter Gearbox): 2.21 lb
217-3268 - (3 CIM Ball Shifter + 3rd Stage): 2.66 lb
217-3269 - (3 CIM Ball Shifter + WCD 3rd Stage): 2.75 lb
217-3267 - (3 CIM Ball Shifter Hardware Kit): 0.23 lb
217-3250 - (3 CIM Ball Shifter Housing Kit): 0.59 lb

Pneumatics:
217-2778 - (Pancake Cylinder, 3/4" Bore, 1/2" Travel): 0.138 lb

Spread Kits:
217-3270 - (Short Shifter Shaft 2.16 Ratio Spread Kit): 0.559 lb
217-3278 - (Short Shifter Shaft 2.65 Ratio Spread Kit): 0.574 lb
217-3279 - (Short Shifter Shaft 3.68 Ratio Spread Kit): 0.607 lb
217-3280 - (Long Shifter Shaft 2.16 Ratio Spread Kit): 0.579 lb
217-3281 - (Long Shifter Shaft 2.65 Ratio Spread Kit): 0.590 lb
217-3282 - (Long Shifter Shaft 3.68 Ratio Spread Kit): 0.623 lb

3rd Stage Gear Kits:
217-3286 - (3rd Stage 50:34 Gear Kit): 0.268 lb
217-3285 - (3rd Stage 54:30 Gear Kit): 0.279 lb
217-3284 - (3rd Stage 60:24 Gear Kit): 0.308 lb
217-2617 - (3rd Stage 64:20 Gear Kit): 0.331 lb

Optional Sprockets:
217-2662 (#35 Sprocket w/ Hub - 12t - 1/2" Hex ID): 0.04 lb
217-2660 (#35 Sprocket w/ Hub - 15t - 1/2" Hex ID): 0.057 lb
217-2642 (#25 Sprocket w/ Hub - 16t - 1/2" Hex ID): 0.03 lb
217-3488 (#25 Sprocket w/ Hub - 18t - 1/2" Hex ID): 0.04 lb
217-2640 (#25 Sprocket w/ Hub - 22t - 1/2" Hex ID): 0.045 lb

1/2" Hex