hi i'm andy from the brainstormers and in this video we'll be talking about three
major building systems used in ftc they are tetrix actobotics and gobilda
so now we'll be talking about channels first up is tetrix which is the oldest building system
it has a non-consistent hole pattern which makes it very difficult to attach to other parts next
is actobotics it is a newer building system that is based off imperial measurements
and it's also worked off some of the flaws that tetrix encountered
most notably is the consistent whole pattern which makes it much easier to attach parts in
a variety of positions finally we have gobilda the newest of the major building systems
it is from the actobotics family but it uses metrics measurements and it also features a bigger
space in between the plates its whole pattern is also consistent but it does have the ovals
in case people want to make slight adjustments with their mounting now we'll be talking about
beams this is the tetrix one it features a consistent hole pattern but it is quite thin
so it is easily bendable actobotics has two different types of beams this first one is
thicker than tetrix's it also has a consistent hull pattern it is a really good tool for when
you need to connect things structurally but you don't want the size of a channel their next one
is a mini channel it is useful when combining mini beams for actobotics or other structural
things where you don't need as much strength we have two different types of gobilda beams
this one is a square beam that features through holes but it does have tapped holes on the end so
that you can connect beams together this is also useful for structural components where you don't
want the massive size of the gobilda channels gobilda also sells these l brackets which are
very useful for connecting corners and making them structurally sound so now we'll be talking about
l brackets they are very useful for connecting channels together or whenever you need a corner
this first one is the tetrix rounded corner l bracket this fits inside of a channel but it is
quite flimsy and can easily be bent now we have the tetrix square bracket it does not fit inside
of a channel but provides the same usage as the rounded one otherwise now moving on to actobotics
they feature a square l bracket as well which is quite similar to the tetrix square one but it
just has more holes which fits the actobotics hole pattern this also does not fit inside of a channel
this slightly beefier actobotics rounded corner features threaded holes and it fits inside of a
channel but most importantly it is much stronger and resistant to bending lastly for actobotics we
have this 90 degree bracket it features only two threaded holes so it is used for mounting in the
corners but it also has a 45 degree angle in case you need that this is also very strong considering
it has the three forms of a triangle like the other building systems gobilda has a standard l
bracket with all the same usages but it just fits their hull pattern next up for gobilda it is the
beefy bracket it is the same as the actobotics one but it just fits the gobilda hole pattern
and it also has the threaded holes gobilda also has the 45 degree triangle bracket it has
five threaded holes it still has the 45 degree mounting but it also features holes on the side
in case you need to mount it in that way lastly we have the gobilda small l bracket it has a square
pattern of holes which is more limited than the l bracket but it has some threaded holes
so you can mount it in this small compact way we'll be talking about motion components now
for all the building systems the first one is the tetrix 4.7 millimeter d shaft this can be easily
be bent by another robot so it is not recommended now we have the actobotics quarter inch d shaft
which is slightly bigger than the tetrix one and it can still be bent but it is also very useful
inside of your robot where it's protected last up for axles is the gobilda eight millimeter rex
which features the hexagonal pattern and has the threaded inside it even has the e-clip which acts
as a coupler and this is much stronger than any of the axles we've talked about previously
now talking about bearings and bushings we have the tetrix bushing
this is not recommended because it does not have the ball bearings
so it doesn't really create a smooth motion in your robot it can bind up axles and it's just not
as smooth now we have the actobotics quarter inch bearing with the flange this one creates a much
smoother experience than the tetrix bushing finally we have the gobilda eight millimeter
rex bearing which also creates a smooth motion when paired with its axle now we'll be talking
about hubs this one is the tetrix 4.7 millimeter hub it fits on the axle and then when you want to
tighten you tighten the set screw onto that part of the d shaft that flat part of the d shaft this
is not recommended because it can damage some spots on the d shaft which can eventually cause
your shaft not to fit through bushings now we have the actobotics quarter-inch clamping hub this is
much better than the set screws because there's no risk about damaging the axles and it's very simple
just to tighten this screw on the side finally we have the gobilda eight millimeter rec sonic hub
this has similar features to the clamping hub but it has two screws so you get a tighter fit this is
a tetrix motion component it features the bushings the channel the axle and a tetrix omni wheel
it is the least smooth of them all because of the bushings next up is an actobotics motion component
it is either the smoothest or the second smoothest it features their bearings their quarter inch
axle a coupler and the hub it also features some spacers to make sure that there's as little
friction as possible finally we have the gobilda motion component this does not need a coupler
because it has the e-clip as we talked about on the axle it also features the eight millimeter
rex axle now we'll just look at some ways to mount motors onto actobotics and gobilda channels
so for this one this is actobotics and you can see there's an adapter part needed to make sure that
the hole pattern matches up but when we transfer to gobilda it is even easier because the gobilda
motor fits up with the hole pattern on the gobilda channels all you need is some screws finally
we have a gobilda channel with a motor inside of it which just shows the size
and why it is that size it also is mounted using this piece which shows that you can
mount it pointing out so for takeaways we would not recommend the tetrix building system as it is
not being developed as much and it is far behind actobotics and gobilda
if you're currently using actobotics we say you should stick with it because it is while gobilda
it is slightly better it is not worth the cost to make that complete jump but if you are a new team
or you are you are using gobilda we think that you should stay with it or look to purchase it because
it is the best best building system and they are developing the most new parts for it thank you