TETRIX is generally not recommended due to its restricted flexibility and low long-term reliability. This page serves as historical reference for teams that have and use TETRIX parts, but there is little reason to purchase them.

The TETRIX build system is a fixed pitch, channel-based building system that uses both imperial and metric units.

Special Considerations#

  • Sistemul de construcție TETRIX se învârte în jurul unor profile din aluminiu de 32 mm c-channels și o gaură de șuruburi de 16 mm, la o distanță de 16 mm (centrele găurilor sunt la 16 mm distanță). TETRIX este modelat de-a lungul acestor profile pentru a crea numeroase variante de montare pentru structurile de construcție.

  • Aceste canale au tendința de a se îndoi sub sarcină, necesitând deseori întărire cu ajutorul mai multor profile pentru a-și menține forma.

  • While TETRIX channel is measured in metric units, the system employs Imperial (SAE) bolts and Imperial chain. This mix of units means that things often don’t quite line up how they’re supposed to, causing unforeseen problems.

  • Întinzătoarele sunt adesea necesare atunci când se utilizează lanțurile pe TETRIX.

  • Angrenajele TETRIX și pinioanele oferă opțiuni foarte limitate pentru crearea de rapoarte. Angrenajele din aluminiu tind să se uzeze foarte repede, mai ales dacă nu sunt susținute corect pe ambele părți.

  • Piesele Tetrix nu au, în general, cea mai bună reputație în ceea ce privește fiabilitatea și longevitatea din cauza alegerii unor materiale inferioare.

  • Piesele Tetrix au un preț ușor supraevaluat și nu au un raport calitate-preț bun, așa cum se găsește în kituri precum REV și goBILDA.


While you may be considering TETRIX as a starter kit, we encourage you to explore your options before selecting a kit. While Tetrix does pick up quite a lot of flak from the community, it isn’t a bad choice in terms of physical qualities such as strength, but the mounting options and hole patterns leave more to be desired and restrict teams in terms of flexibility.

Kit of Parts#


  • Kitul TETRIX, fiind cea mai de bază dintre toate opțiunile de kit, este ușor de învățat și oferă o varietate de opțiuni de construcție. Kitul în sine vine cu c-channel, care este aluminiu în formă de C. Acesta are găuri pretăiate, astfel încât motoarele, girele, sau arborele de transmisie pot fi integrate fără probleme în canal. Pentru o echipă de începători cu puțină sau deloc experiență, un kit TETRIX vă permite să asamblați o transmisie funcțională în câteva ore (Notă: Majoritatea celorlalte kituri vă permit să faceți același lucru, dar cu mai multe opțiuni de personalizare).

  • Furthermore, TETRIX is decent in terms of structural integrity, as long as the channels are loaded in the correct orientation. Typically, the orientation should be like an „n”, with the top face upward. Connecting the channels with locknut instead of regular nuts aids in longevity. However, TETRIX is the weakest of the build systems and is very prone to bending, especially with long pieces of channel that have multiple axes of load.

  • It is simple to build basic mechanisms such as an arm using the gears and d-shaft. However, there are potential drawbacks to doing so.


  • The TorqueNADO motors are comparable with NeveRest 60:1. They are usable, however have more limited uses due to their slow gear ratio, which means high torque but relatively slow output speed. The TorqueNADO uses spur gearboxes, and will not handle as much shock load as other planetary options, namely AndyMark 20 Orbitals, REV HD Planetary, or the goBILDA Yellow Jacket Planetaries.

  • The aluminum gears seem to grind against each other often, even with correct spacing, and do not last very long, especially under high torque situations.

  • TETRIX hubs are 6mm or 4.7mm round and are based on set screws which are torque transferring. These set screws are notorious for coming loose under load, so special care must be taken to continuously tighten these screws. Additionally, it is highly recommended that teams use some sort of threadlocker on set screws, whether it be Loctite Blue (removable) or Loctite Red (nonremovable). A possible workaround is purchasing 6mm D clamping hubs from goBILDA to use on TETRIX shafts, however, this also necessitates the use of a pattern adapter from the goBILDA pattern to TETRIX.

  • Due to using a metric based pattern but using imperial based holes and chain standards, chain will not have perfect tension when running from one hole in channel to another. An external tensioner will be required to implement chain systems.

  • TETRIX is also the most expensive kit on average while providing the most limited build options. Finally, the tight spacing and mix of units limits teams if they would want to integrate custom parts with TETRIX.

  • Set screws on TETRIX hubs can mar motor shafts, and the bore of the hub itself can enlarge, leading to a wobbly or misaligned hub.

Tips for use#

In any build system, it is important to properly support the structure of your robot. This includes supporting axles at two or more points of contact, or having multiple points of support for a piece of channel. Due to TETRIX’s relatively fragile nature, this advice goes double with TETRIX. Instead of just supporting a shaft at two points, it is recommended to support the shaft at 4 or more (if you are using a 4.7mm standard). When mounting motors, it is recommended that two clamping motor mounts are used to mount one motor. Using standoffs inside channel to prevent the channel from bending inward or outward is also highly recommended.

6022 To Be Determined's Velocity Vortex Robot

6022 To Be Determined: Worlds Semifinalist (St. Louis), Velocity Vortex#

TETRIX based robots have succeeded in competition, albeit it has become rarer in recent years.