The Actobotics kit from ServoCity (https://www.servocity.com/actobotics) is a fixed-pitch, channel-based building system using imperial units. Its 1.5” c-channel and ball-bearing based motion system allows teams to iterate and build mechanisms entirely from kit parts.
Actobotics’ channel hole pattern has many more mounting holes than a Tetrix channel, so it offers more flexibility in terms of mounting.
Actobotics uses imperial units across the board, allowing for clean spacing and fitting. However, most other kits use metric.
Actobotics can interface with other kits such as REV through a variety of Pattern Adapters.
ServoCity offers a 25% off discount for all FIRST teams making pricing competitive.
Mini-channel is offered in addition to the standard size channel for non-structural components.
To complement the structural offerings, Actobotics uses a series of clamping hubs and a robust 1/4” steel D-shaft.
The Linear Motion Kit uses X-rail extrusion to build extending mechanisms.
Actobotics is a solid choice for new teams, offering a reliable base kit with many options to expand upon.
Aluminum c-channel and mini channel of various lengths
X-rail (a special type of extruded rail similar to 8020)
Assorted plates and brackets, flat and 90 degree
Clamping hubs, spacers
Gears and sprockets
HS-488 HB servo (4x), assorted accessories
5201 Series, 53:1 Ratio, 105 RPM Spur Gear Motor
5201 Series, 26.9:1 Ratio, 210 RPM Spur Gear Motor
Bars and angles
Omni and traction wheels
Nuts, screws, fasteners
Tools (screwdrivers, etc.)
Actobotics has the patented Servoblocks, which help drastically increase servo life by protecting it from shock loads. More information may be found in the glossary.
Actobotics is easily compatible with other build systems such as REV’s kit using adapters which can be found on the Servocity website.
Actobotics is more sturdy than TETRIX in terms of drivetrain flex and has more support options to prevent structural bending.
The clamping hubs offered are more reliable than set screws, as clamping engages the shaft in more places than a set screw (one face). As discussed in the TETRIX section, set screws in particular are vulnerable to loosening, especially without application of Loctite.
Actobotics’ motion system is very robust and relies on ball bearings, which have a lower coefficient of friction than bushings. Actobotics is compatible with the 5mm hex used by REV with their adaptable hubs.
Actobotics is not very cheap, so its cost may be prohibitive for some teams with a low budget. Note that with the 25% off FTC team discount, Actobotics can be cheaper than TETRIX. The only cheaper build system is REV.
The belts from ServoCity are not great. It is recommended that belts are purchased from vendors other than ServoCity. This may necessitate 3D printed belt pulleys and other parts, which is more difficult for newer teams. There also isn’t a large amount of space inside the channel for a belt or chain run, vastly limiting the size of the pulleys.