3 CIM Ball Shifter

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


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.

SKU: 3cimballshifter

Availability: Varies

$109.99
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  • - Out Of Stock
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Details
Description

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:

Low Gear Stage Option 1: 50:34
Low Gear Stage Option 2: 54:30
Low Gear Stage Option 3: 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

GearboxOverall High Gear ReductionOverall Low Gear ReductionShifter Spread
2-Stage 2.83:1 6.13:1 2.16x
2-Stage 2.83:1 7.50:1 2.65x
2-Stage 2.83:1 10.42:1 3.68x
3-Stage 64:20 9.07:1 19.61 2.16x
3-Stage 64:20 9.07:1 24.00:1 2.65x
3-Stage 64:20 9.07:1 33.33:1 3.68x
3-Stage 60:24 7.08:1 15.32:1 2.16x
3-Stage 60:24 7.08:1 18.75:1 2.65x
3-Stage 60:24 7.08:1 26.04:1 3.68x
3-Stage 54:30 5.10:1 11.03:1 2.16x
3-Stage 54:30 5.10:1 13.50:1 2.65x
3-Stage 54:30 5.10:1 18.75:1 3.68x
3-Stage 50:34 4.17:1 9.01:1 2.16x
3-Stage 50:24 4.17:1 11.03:1 2.68x
3-Stage 50:24 4.17:1 15.32:1 3.68x

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.


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

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.

217-3268: Standard 3-Stage Configuration

217-3269: WCD 3-Stage Configuration

CAD/Drawings

Details

P/NDescriptionMaterialCADDrawingsWeight
217-3195 3 CIM Ball Shifter Base Kit Gears: 7075-T6 Aluminum
CIM Input Gears: 4140 Steel
Shafts: 7075-T6 Aluminum
Shifter Housing: Glass-Filled Nylon
STEP PDF 2.210 lbs
(No Motors)
217-3268 3 CIM Ball Shifter Base Kit with 3rd Stage Gears: 7075-T6 Aluminum
CIM Input Gears: 4140 Steel
Shafts: 7075-T6 Aluminum
Shifter Housing: Glass-Filled Nylon
STEP Gearbox
Output Shaft
2.660 lbs
(No Motors)
217-3269 3 CIM Ball Shifter Base Kit with WCD 3rd Stage Gears: 7075-T6 Aluminum
CIM Input Gears: 4140 Steel
Shafts: 7075-T6 Aluminum
Shifter Housing: Glass-Filled Nylon
STEP Gearbox
Output Shaft
2.750 lbs
(No Motors)
 
217-3250 3 CIM Ball Shifter Housing Kit Glass-Filled Nylon STEP PDF 0.590 lbs
 
217-3287 Short Shifter Shaft 2.16 Ratio Spread 4140 Steel STEP PDF 0.559 lbs
217-3288 Short Shifter Shaft 2.65 Ratio Spread 4140 Steel STEP PDF 0.574 lbs
217-3289 Short Shifter Shaft 3.68 Ratio Spread 4140 Steel STEP PDF 0.607 lbs
217-3290 Long Shifter Shaft 2.16 Ratio Spread 4140 Steel STEP PDF 0.579 lbs
217-3291 Long Shifter Shaft 2.65 Ratio Spread 4140 Steel STEP PDF 0.590 lbs
217-3292 Long Shifter Shaft 3.68 Ratio Spread 4140 Steel STEP PDF 0.623 lbs
How To
Additional Info
Kit Contents
217-3195: 3 CIM Ball Shifter Base Kit
  • (1) 3 CIM Ball Shifter Housing Kit
  • (1) 50t Gear with 3/8" Hex Bore
  • (1) 3 CIM Ball Shifter Hardware Kit
  • (1) Ball Shifter Pneumatics Kit
  • (1) Shifter Bearing Kit
  • (1) Ball Shifter Encoder Hardware Kit

217-3268: 3 CIM Ball Shifter Base Kit with 3rd Stage
  • (1) 3 CIM Ball Shifter Housing Kit
  • (1) 50t Gear with 3/8" Hex Bore
  • (1) 3 CIM Ball Shifter Hardware Kit
  • (1) 3rd Stage Hardware Kit
  • (1) Ball Shifter Pneumatics Kit
  • (1) Shifter Bearing Kit
  • (1) Ball Shifter Encoder Hardware Kit

217-3269: 3 CIM Ball Shifter Base Kit with WCD 3rd Stage
  • (1) 3 CIM Ball Shifter Housing Kit
  • (1) 50t Gear with 3/8" Hex Bore
  • (1) 3 CIM Ball Shifter Hardware Kit
  • (1) 3rd Stage WCD Hardware Kit
  • (1) Ball Shifter Pneumatics Kit
  • (1) Shifter Bearing Kit
  • (1) Ball Shifter Encoder Hardware Kit

Long Shifter Shaft 2.16 Ratio Spread Kit
    • (1) Long Shifter Shaft 2.16 Ratio Spread
    • (1) 34T Gear with 3/8" Hex Bore

Long Shifter Shaft 2.65 Ratio Spread Kit
    • (1) Long Shifter Shaft 2.65 Ratio Spread
    • (1) 30T Gear with 3/8" Hex Bore

Long Shifter Shaft 3.68 Ratio Spread Kit
    • (1) Long Shifter Shaft 3.68 Ratio Spread
    • (1) 24T Gear with 3/8" Hex Bore

Short Shifter Shaft 2.16 Ratio Spread Kit
    • (1) Short Shifter Shaft 2.16 Ratio Spread
    • (1) 34T Gear with 3/8" Hex Bore

Short Shifter Shaft 2.65 Ratio Spread Kit
    • (1) Short Shifter Shaft 3.68 Ratio Spread
    • (1) 24T Gear with 3/8" Hex Bore

Short Shifter Shaft 3.68 Ratio Spread Kit
    • (1) Short Shifter Shaft 3.68 Ratio Spread
    • (1) 24T Gear with 3/8" Hex Bore
Outputs 1/2" Hex
Specification Gears require lubrication. We recommend white lithium grease or DuPont Teflon Non-Stick Dry-Film Lubricant