AndyMark EVO Shifter am14u Family Hex Shaft, StageA 2 Stage - 22.67:1 Ratio, StageB 2 Stage - 10.86:1 Ratio

• AndyMark EVO Shifter am14u Family Hex Shaft, StageA 2 Stage - 22.67:1 Ratio, StageB 2 Stage - 10.86:1 Ratio
• Offers shift-on-the-fly capability
• Incorporates robust AMPCO® 18 Bronze gear
• Supports CIM or NEO motors
• Allows flexible output shaft selection
• Features pneumatic shift with spring-extend cylinder

The AndyMark EVO Shifter am14u Family Hex Shaft, StageA 2 Stage - 22.67:1 Ratio, StageB 2 Stage - 10.86:1 Ratio represents a significant advancement in shifting transmission gearboxes. This two-speed, shift-on-the-fly gearbox incorporates an enhanced 4-tooth dog shifting mechanism, 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 output shaft selection. The gearbox is delivered assembled, though motors are not pre-installed.

Significant improvements have been made over previous models, including a robust 1/8" diameter shoulder screw and the use of AMPCO® 18 Bronze for the dog gear, which enhances strength and lubricity. The shift block assembly is reinforced with a larger bearing and threaded steel housing. The input stage employs 32 DP gears and a 15-tooth pinion gear, facilitating a high first stage reduction of 85:15. Users can independently select high and low ratios, with the option to swap ratios as needed. The gearbox also supports various encoder options, including the US Digital E4T.

The EVO Shifter features aggressive weight reduction through machined gears and plates, and the cluster gears are designed for easy assembly without orientation concerns. An optional third stage provides additional ratio choices. The gearbox can be mounted to an AM14U family chassis or a 2"x1" box tube frame. It utilizes a pneumatic shift method powered by a spring-extend pneumatic cylinder, allowing for shifting during acceleration, pushing, or deceleration.

The gearbox requires proper greasing for optimal performance and longevity. A break-in period without grease is recommended to ensure smooth operation, followed by periodic application of grease to the spur gears. The encoder ratio for two-stage versions is 3:1, and the gearbox includes shielded, flanged ball bearings, 1117 steel 32 DP gears, and 4140 steel output shafts.