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alright guys we finally finished the
Batman grappling-hook ascension which
it's awesome now as you know we've been
working on those for several months now
because it's actually a very complex
project we actually showed the very
first revision of the prototype in the
original Batman grappling hook gun video
we had made it out laser-cut acrylic and
it was enough to test the
proof-of-concept
but not enough to actually make the
final version now unfortunately we can't
make all components in-house so hobby
kings provide all the other components
we need to make this project a reality
there's links in the description below
to everything that we used since then
we've reiterated to design multiple
times and spent hundreds of hours
designing and building this thing now
we're ready to show you now this is one
of our most complex projects yet and
we've designed almost everything from
the ground up in fact if we're to
outsource all the parts we need to
manufacture it would probably cost us
several thousand dollars but luckily we
have a PC and C 440 million machine
which allows us to make almost
everything in-house
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you
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while we use 3d printing for the
majority of our prototypes sometimes was
just not strong enough for applications
such cysts luckily one where YouTube
subscribers runs a YouTube channel
called edge precision and he has
professional machining he actually
offered to make us this part out of
Delrin using a five axis CNC machine if
you guys like machining you should
totally check out his channel he has
awesome equipment and is able to work on
really unique projects every day
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all right so how does it work for this
grappling hook extension device we're
actually using two brushless DC motors
from hobbyking and they're raised for
2.5 kilowatts each that's almost three
and a half full horsepower per motor
which means this entire thing is around
eight horsepower which is crazy think
how big an eight horsepower gasoline
engine is compared to how small this is
so the two motors are actually run in
parallel there's a timing belt to make
sure they don't offset from each other
and they're both driven by two
marine-grade EEOC's that support both
forward and reverse because we want to
be able to ascend and be sending using
them now the actual mechanism is hidden
under here and as you saw when we were
building it it's actually two sets of
worm gears with spur gears attached now
the reason a worm gear is super useful
for this application is it can't be back
driven that means if the motor power
dies the rope won't slip because you
literally can't turn a worm gear using a
spur gear you can only turn the spur
gear using the worm gear liking this
animation shown so now let's take a look
at the mechanism as it's moving so first
we're going to pull the rope in a little
bit and you can see it just fits up the
rope the other side now if we do the
opposite now one of the important things
if you mix you have to make sure you
have tension on the incoming rope
because otherwise it can entangle in the
school so holding it and as you can see
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goes back the other way
alright three minutes to untangle
that obviously that's the small area
where we could improve this design for
the next iteration but once you take the
cover off you can access it pretty good
and make sure the rope goes back to
where it belongs so
so if we send the device around you'll
see the main control for going up and
down there's this little lever here
which we actually took off of a servo
tester you press down it pulls the cable
in and if you press up it lets it out
let's do a quick test by pulling the the
baha should loose cable the other way
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sure we don't need those longer chords
in it unplugged itself alright so we've
added the extension cable so now it's
not gonna unplug itself let's go to the
remaining only a few feet actually the
fun part with this is I have to hang on
with free fingers and here's my thumbs
control the speed you might actually our
add like a harness or a wrist strap to
help take some of the load off the hands
but see if we can ease into it it's
slipping on something
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all right before the big final test
video oh really test a grappling hook
gun and ascension winch to its limits
we're obviously going to have to make a
few revisions to this and basically when
we're testing it just there and it was
slipping a bit that's because we're
still using a 3d printed part here which
really can't take Kevlar is actually
really abrasive so it running around the
spool like that is just destroying the
3d print part so we're going to get
another one made of either aluminum or
Delrin like the original school and then
the system should work exactly as design
exactly as designed we're planning an
awesome test video to really test the
limits of the fat man grappling hook gun
launcher the likes of which the internet
has never seen before this thing is
better than anything that's commercially
available might not have the same safety
features though to make sure you're
notified as soon as that video goes live
make sure you're subscribed and hit that
notify belt it's going to be a video you
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little lever here down is up up is down