EVO Shifter

The EVO Shifter is our next EVOlution of a shifting transmission gearbox. It's design was developed from the lessons learned during our experience using the AM Shifter since 2004, the Super Shifter since 2007 and the Sonic Shifter since 2013.
This transmission is a two-speed, shift-on-the-fly gearbox, using an improved 4-tooth dog shifting method. Motor input can be two CIM or NEO motors. The transmission can be configured with two or three interior stages, and a selection of various 1/2 inch output shafts. Plates are designed for mounting two motors. This transmission is shipped assembled, but without motors installed, even if motors are included on the order. 

Improvements:
A number of significant improvements, not seen in previous AndyMark shifters, have been implemented in the EVO Shifter.

• The dog gear now has 4 dogs on each face. This allows more material around the dog gear screw, increasing strength over previous designs.
• A robust 1/8" diameter shoulder screw replaces the previously used #4-40 screw.
• The dog gear material is AMPCO® 18 Bronze. This material has similar properties to stainless steel (previously used), but has added lubricity for smooth shifting.
• A new, super-strong shift block assembly with a larger bearing and threaded steel housing is now included.
• The input stage uses 32 DP gears and a 15 tooth pinion gear. This allows for a high 85:15 first stage reduction.
• This gearbox allows users to independently pick their high and low ratios, and are no longer confined to set spreads.
• The user can swap the ratios (A to B, B to A) as needed.
• More encoder options are available, including the US Digital E4T (included) and the CTRE SRX mag encoder (sold separately).
• Aggressive weight reduction features have been machined into the gears and plates.
• All of the cluster gears have the same features surrounding the bore on both sides. This allows the user to dis-assemble and assemble the shifter without worry of correct gear orientation.
• Users can pick two or three stages for their transmission. An optional 3rd stage provides an additional C ratio choice of 1:1.14 or 2:1. Refer to the Ratio table at the bottom of the page to find out what your C ratio is. 
• Using existing mounting plate holes, it can be mounted to an AM14U family chassis or a 2"x1" box tube frame.

Air Cylinder Shifting:
The EVO Shifter uses a pneumatic shift method.

• A spring-extend pneumatic cylinder (am-4229), powers the shift. This pneumatic shift can be done while a robot is accelerating, pushing, or decelerating.
  • Extend Stroke (spring extend): 4lbs
  • Retract Stroke (air actuated @ 40PSI): 15.7lbs
• This cylinder extends into the selected "Ratio A" when no air pressure is supplied. This allows a robot to continue to drive using Ratio A if air pressure is lost.

Weight Range (Without Motors):
Two Stage: 2.9 - 3.2 Pounds
Three Stage: 3.3 - 3.5 Pounds

Note about Pinions:
The EVO product line utilizes an included 15 Tooth 32DP pinion gear which does not use a key. If you are are unable or uncomfortable performing the following procedures we recommend purchasing a motor with the pinion pre-installed. They are available as am-0255_15T for the CIM or am-4258_15T for the NEO.