AndyMark EVO Shifter Short Keyed Shaft, StageA 2 - 22.67:1 Ratio, StageB 2 - 07.56:1 Ratio
Features smooth 4-tooth dog shifting
Includes US Digital encoder
Supports two or three interior stages
Utilizes pneumatic shift method
Reinforced with AMPCO® 18 Bronze
The AndyMark EVO Shifter Short Keyed Shaft, StageA 2 - 22.67:1 Ratio, StageB 2 - 07.56:1 Ratio represents a significant advancement in shifting transmission gearboxes. This two-speed, shift-on-the-fly gearbox is designed with an improved 4-tooth dog shifting method, allowing for smooth and efficient 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 installed.
Significant improvements have been made over previous models, including the use of AMPCO® 18 Bronze for the dog gear, which provides enhanced strength and lubricity. The shift block assembly has been reinforced with a larger bearing and threaded steel housing, contributing to the gearbox's robustness. The input stage features 32 DP gears and a 15-tooth pinion gear, facilitating a high first stage reduction. Users have the ability to independently select high and low ratios, providing greater customization.
The gearbox incorporates a pneumatic shift method, utilizing a spring-extend pneumatic cylinder for shifting. This allows for gear changes even during acceleration or deceleration. The gearbox is designed to be mounted on an AM14U family chassis or a 2"x1" box tube frame, using existing mounting plate holes. Weight ranges from 2.9 to 3.2 pounds for the two-stage version and 3.5 pounds for the three-stage version, excluding motors.
For optimal performance, it is recommended to run the gearbox for 30 minutes without grease to allow the gear teeth to wear in, followed by periodic application of Red Tacky Grease to the spur gears. The gearbox includes a US Digital encoder and a pneumatic cylinder, enhancing its functionality and ease of use.
Note: Ensure proper installation of pinion gears, especially when using a NEO motor, as a 3-ton arbor press is required due to the interference fit. Follow the NEO Press Fit Pinion Guide for safety and optimal performance.
1x Shielded, flanged ball bearing
1x US Digital encoder
1x Pneumatic cylinder
1x Red Tacky Grease, 14.2 gram
Various spacers, bearings, and hardware for assembly
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
Selection of various 1/2 inch output shafts
Plates designed for mounting two motors
Pneumatic shift method with spring-extend pneumatic cylinder
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.
United Kingdom consumers exercising their statutory Right of Cancellation are subject to different conditions. See the Statutory Right of Cancellation.
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 Authorisation (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.
Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
Refunds are processed within 7 days after receipt and inspection of the returned item.
A £100 cleaning fee may apply to domestic robots returned in used or unclean condition.
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, tyres, 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.
Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odour-absorbing products). Not eligible for return once unsealed.
Build-it-yourself products and items requiring customer assembly * — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
Digital Goods, Software, and Apps * — Final sale only, due to licensing restrictions.
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 fulfil a customer request.
* United-Kingdom consumers retain their statutory Right of Cancellation on these items. Its exercise is subject to the conditions and exclusions set out in the Statutory Right of Cancellation, and any reimbursement may be reduced to reflect a loss in value resulting from handling beyond inspection.
How to Request a Return Authorisation (RA)
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.
Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
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]".
