Description
- AndyMark EVO Shifter Short Hex Shaft, StageA 3 Stage – 32.74:1 Ratio 2:1, StageB 3 Stage – 21.72:1 Ratio 2:1
- Offers seamless two-speed shifting system
- Supports CIM or NEO motor compatibility
- Employs durable AMPCO 18 Bronze dog gear
- Reduces weight with machined gears and plates
- Facilitates pneumatic shift during any motion
The AndyMark EVO Shifter Short Hex Shaft, StageA 3 Stage – 32.74:1 Ratio 2:1, StageB 3 Stage – 21.72:1 Ratio 2:1 represents a significant advancement in shifting transmission gearboxes. This two-speed, shift-on-the-fly gearbox incorporates a refined 4-tooth dog shifting mechanism, allowing for seamless transitions between speeds. It is compatible with two CIM or NEO motors and can be configured with either two or three interior stages, providing flexibility in performance. The gearbox is delivered assembled, though motors are not pre-installed.
This model introduces several enhancements over previous iterations, including a robust 1/8″ diameter shoulder screw and a dog gear made from AMPCO 18 Bronze, which offers improved strength and lubricity. The shift block assembly has been fortified with a larger bearing and threaded steel housing. The input stage utilizes 32 DP gears and a 15-tooth pinion gear, facilitating a high 85:15 first stage reduction. Users have the autonomy to select their preferred high and low ratios, with the ability to interchange them as needed. Additionally, the gearbox supports various encoder options, including the US Digital E4T and the CTRE SRX mag encoder.
The EVO Shifter employs a pneumatic shift method, powered by a spring-extend pneumatic cylinder, enabling shifts during acceleration, pushing, or deceleration. In the absence of air pressure, the system defaults to “Ratio A,” ensuring continued operation. The gearbox features aggressive weight reduction through machined gears and plates, and it can be mounted to an AM14U family chassis or a 2″x1″ box tube frame.
Note: Proper greasing is essential for optimal operation and longevity. It is recommended to run the gearbox for 30 minutes without grease for initial wear-in, followed by periodic application of Red Tacky Grease to the spur gears. No grease is required on the AMPCO bronze dog gear.
View moreWhat’s Included
- 1x AndyMark EVO Shifter Short Hex Shaft, StageA 3 Stage – 32.74:1 Ratio 2:1, StageB 3 Stage – 21.72:1 Ratio 2:1
- Shielded, flanged ball bearings
- 1117 steel 32 DP gears, with 20-degree pressure angle (1st stage)
- 4140 steel 20 DP gears, with 14.5-degree pressure angle (2nd and 3rd stage)
- 1/4″ thick aluminum side plates, pocketed
- US Digital encoder and pneumatic cylinder
- 4140 steel output shafts
- 1x Red Tacky Grease, 14.2 gram
- Various spacers, bearings, and hardware for assembly
Specifications
- Two-speed, shift-on-the-fly gearbox
- Enhanced 4-tooth dog shifting method
- Compatible with two CIM or NEO motors
- Configurable with two or three internal stages
- Pneumatic shift method with spring-extend pneumatic cylinder
- 1/2 inch output shafts
- Features aggressive weight reduction
- Encoder options available
- Air cylinder shifting with extend stroke: 4 lbs and retract stroke: 15.7 lbs
- 32 DP gears and a 15-tooth pinion gear for high 85:15 first stage reduction
- Allows independent selection of high and low ratios
- Can be mounted to an AM14U family chassis or a 2″x1″ box tube frame
Unconditional Satisfaction Guarantee
