Description
- AndyMark EVO Shifter am14u Family Shaft, StageA 3 Stage – 21.72:1 Ratio 2:1, StageB 3 Stage – 12.00:1 Ratio 2:1
- Represents significant gearbox advancement
- Incorporates seamless gear transitions
- Optimizes durability with AMPCO 18 Bronze
- Enables flexible motor configurations
- Reduces weight aggressively and efficiently
The AndyMark EVO Shifter am14u Family Shaft, StageA 3 Stage – 21.72:1 Ratio 2:1, StageB 3 Stage – 12.00:1 Ratio 2:1 represents a significant advancement in shifting transmission gearboxes. This two-speed, shift-on-the-fly gearbox incorporates an enhanced 4-tooth dog shifting method, allowing for seamless transitions between gears. It is compatible with two CIM or NEO motors and can be configured with either two or three interior stages, offering flexibility in performance. The gearbox is shipped assembled, though motors are not pre-installed.
The design improvements include a robust 1/8″ diameter shoulder screw and a dog gear made from AMPCO 18 Bronze, which provides added strength and lubricity compared to previous stainless steel designs. The shift block assembly is reinforced with a larger bearing and threaded steel housing, enhancing durability. The input stage employs 32 DP gears and a 15-tooth pinion gear, facilitating a high 85:15 first stage reduction. Users have the liberty to select independent high and low ratios, with the option to swap ratios as needed.
The gearbox features aggressive weight reduction techniques and allows for easy disassembly and reassembly without concern for gear orientation. It can be mounted to an AM14U family chassis or a 2″x1″ box tube frame using existing mounting plate holes. The pneumatic shift method, powered by a spring-extend pneumatic cylinder, ensures reliable operation even during acceleration or deceleration.
For optimal performance, it is recommended to follow specific greasing and break-in procedures. The gearbox requires periodic application of Red Tacky Grease to maintain smooth operation, though the AMPCO bronze dog gear does not require greasing. The encoder ratio for two-stage versions is 3:1, providing precise control and feedback.
Note: When using a NEO motor, a 3-ton arbor press is required to install the pinion due to the intended interference fit. Please follow the NEO Press Fit Pinion Guide for proper installation.
View moreWhat’s Included
- 1x AndyMark EVO Shifter am14u Family Shaft, StageA 3 Stage – 21.72:1 Ratio 2:1, StageB 3 Stage – 12.00:1 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
- Individual hardware within two-stage assembly
- 1x Red Tacky Grease, 14.2 gram
- 1x Encoder Mount Pad
- 1x EVO Shifter Shift Block Assembly
- 1x E4T Encoder
Specifications
- Two-speed, shift-on-the-fly gearbox
- Improved four-tooth dog shifting method
- Motor input: two CIM or NEO motors
- Configurable with two or three interior stages
- Selection of various 1/2 inch output shafts
- Plates designed for mounting two motors
- Shipped assembled, without motors installed
- Dog gear with four dogs on each face for increased strength
- Robust 1/8″ diameter shoulder screw
- Dog gear material: AMPCO 18 Bronze
- Super-strong shift block assembly with larger bearing and threaded steel housing
- Input stage uses 32 DP gears and a 15-tooth pinion gear
- High 85:15 first stage reduction
- Independent high and low ratio selection
- More encoder options available
- Aggressive weight reduction features
- Cluster gears with features surrounding the bore on both sides
- Optional third stage provides additional C ratio choice of 1.14 or 2:1
- Pneumatic shift method with spring-extend pneumatic cylinder
- Extend stroke: 4 lbs, retract stroke: 15.7 lbs
- Included 15-tooth 32DP pinion gear
- Recommended greasing and break-in procedures
- Encoder ratio: 3:1 for two-stage versions
Unconditional Satisfaction Guarantee
