AndyMark EVO Shifter Short Keyed Shaft, StageA 2 Stage - 07.56:1 Ratio, StageB 2 Stage - 10.86:1 Ratio
Offers seamless two-speed shifting
Enhances durability with AMPCO® 18 Bronze
Allows versatile high/low ratio selection
Incorporates lightweight design features
Supports multiple encoder options
The AndyMark EVO Shifter Short Keyed Shaft, StageA 2 Stage - 07.56:1 Ratio, StageB 2 Stage - 10.86:1 Ratio represents a significant advancement in shifting transmission gearboxes. This two-speed, shift-on-the-fly gearbox is designed for use with two CIM or NEO motors, offering flexibility in motor input. The gearbox is shipped assembled, though motors are not installed. It features a robust design with a 4-tooth dog shifting method, enhancing strength and durability. The dog gear is crafted from AMPCO® 18 Bronze, providing smooth shifting due to its lubricity. A new shift block assembly with a larger bearing and threaded steel housing further strengthens the gearbox.
The EVO Shifter allows users to select high and low ratios independently, providing versatility in performance. It supports two or three interior stages, with an optional third stage offering additional ratio choices. The gearbox is compatible with various encoder options, including the US Digital E4T and the CTRE SRX mag encoder. Weight reduction features have been incorporated into the gears and plates, ensuring a lightweight yet sturdy construction. The gearbox can be mounted to an AM14U family chassis or a 2"x1" box tube frame using existing mounting plate holes.
The shifting mechanism utilizes a pneumatic method, powered by a spring-extend pneumatic cylinder. This allows for seamless shifting even during acceleration or deceleration. In the event of air pressure loss, the gearbox defaults to "Ratio A," ensuring continued operation. The gearbox requires proper greasing for optimal performance and longevity, with a recommended break-in period before applying grease. The encoder ratio for programming is 3:1 between the Output Shaft and Encoder Shaft in the two-stage version.
Note: Ensure proper installation of the pinion gear, especially when using a NEO motor, as it requires a 3-ton arbor press due to the interference fit. Follow the NEO Press Fit Pinion Guide for safety and optimal performance.
1x AndyMark EVO Shifter Short Keyed Shaft, StageA 2 Stage - 07.56:1 Ratio, StageB 2 Stage - 10.86:1 Ratio
WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov.
Refund Policy
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
A valid Return Authorization (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
The RA number is valid for 30 days. The returned item must be received within that period.
The RA number must be included with the return.
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A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
Consumables — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tires, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
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Clearance Items — Products identified as clearance or final sale, including end-of-life or discontinued items.
Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
On-Demand Items — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfill a customer request.
While the same return policy applies, these orders require a separate contact process for returns.
RobotShop Fulfilled Orders → submit a support ticket from your account under My Support Tickets.
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Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".
