Hello
and welcome to how to build a grappling dummy looking around
I've noticed that most people are amking dummies out of wire hangers
pipes and pool noodles I wanted to do something a little different
if you want to build a grappling dummy realistic
working parts then you're watching the right video this video will show you how to
build a wooden dummy at home
for about sixty dollars less my goal when I
developed this to me was to copy the human anatomy to get the most realistic
training possible
outside for training with a life partner I wanted a locking elbow and knee joint
and shoulders and hips that could swivel
and allow for a full range of motion this dummy is now a functioning piece of
equipment
that can be customized and adjusted to train a variety of grappling techniques
My goal in this video is to show you how to build this dummy yourself
using a few simple tools you will need
a hand saw or an electric saw a drill and drill bits
a hammer a chisel various
nuts-and-bolts wood glue and finally
wood any kind of wood will work
for this video I'm going to use 2x4's
the main key to this whole dummy
is spine joints let's start by making an arm i used the measurements my own body
to determine how long the parts of the dummy should be first time going to saw this
board into two pieces right down the center
you can save time asking a hardware store to cut your wood for you
depending on where you buy it from now that the 2x4 has been split down the
center
I have the pieces for the forearm and upper
arm
here I am tracing a spline joint for the elbow
we need a female slot and a male tennon
the joint should be wide enough to fit a
chisel like this one here and about as long as the board is
thick
ok
I cut the sides away from the male tennon
at a 90 degree angle
the female slot is a bit more tricky first I cut
two slits straight down at ninety degrees then i cut across the slot
from one side to the other remove that piece of
wood cut across the other way that's all I could do with the regular saw
the rest can be removed with a chisel leaving a rectangular slot
next the tennon goes into the slot
and I trace a drill hole on the side right
in the center drill straight through the slot
and the tennon and fasten them together with a bolt
I'm using a three sixteenths inch carriage bolt
try to cut your slot and tennon so that the joint fits tightly
now if we want this to bend like an elbow we need to trim away the inside corners of
both the slot
and the tennon at a 90 degree angle
so
next I will trim away the parts marked in
black
ok
after those corners a trimmed away we have an elbow that locks
straight and bends up to 90 degrees
a real elbow bends more than 90 degrees
so we need to trim another part of the joint
first we need to cut an angle of the
slot on the inside of the bend
that can be done with a chisel I'm tracing that angle on the side
so you can see it
also trim and angle into the sides of the tennon on the inside of the bend
see how those two parts touch when I bend it
remove two parts and it will bend further
in here the piece on the left has already been trimmed
and is able to bend more than the other one
figuring this out might take some trail and error to get it right
but it's okay if you end up cutting too much off
you can always use wood glue to glue pieces back on and fix your mistakes
like I did here
the rest of the arm works the same way the wrist
elbow on the shoulder are all made from
spline joins the same goes for the legs
the ankle is a modified spline joint
that allows for a heel bone to stick out like a real foot
the knee and hip are made the same way
as the elbow and shoulder
let's talk about the main body my original dummy seen here
started out as a huge log that I cut into a rectangular column
you could also glue a stack of 2x4's together
to make a body wood glue was surprisingly strong
just use plenty of it and either clamp your boards together
or put a heavy weight on top to compress the boards while they dry
I added a spline joint to the midsection
my dummy so that it could have some flexibility there I also could help
I also cut out four small sections of the body with the legs and arms attach
to get a more natural feel
the head is just a big wooden block
attached to the body using the neck
from an adjustable you can use a hacksaw or bolt cutters to cut the lead to
pieces
drill hole into the head and body include
together in
if you want your tummy to have a realistic our movement
you should give it swiveling joint here's how I made the shoulder
first make a slot just like we did for the elbow
then but it off a few inches back leaving short piece
next you will need to drill a hole
street to the center in order to allowable to fit through
I'm using five sixteenths inch carraige bolt
so I drill the five sixteenths inch hole
now the head of the bolt is in the way of the tennon
so you will need to come back with a bigger drill bit and drill a countersink
deep enough so that the head of the bolt drops down inside
an out-of-the-way in
in
good
I chose to glue my bolt
to the joint using epoxy that secures the whole thing together
into one solid unit
I'm going to install a t-nut that
on the main body for the shoulder joint to fit into I'm using a five sixteenths inch
T-nut
that will match the bolt for the shoulder joint first need to pre-drill holes
in the shoulder then i remove a rectangular section about
one inch thick and hammer the T-nut
into the pre-drilled hole
finally I need to glue the rectangular section
back into place with the T-nut on the inside
make sure the gluing surfaces are flush
and clambered on with the glue dries you have a shoulder joint accounts will
freely
be sure to screw it in most of the way when training
to lower the chances building 12 boards I can also recommend installing us with
the joint above the elbow
if you want a pic to show deluxe this will give arms
full mobility in
you want to work with you to me and refine it a bit
before you at fool pending I was able to find
all the materials for this local department store in the crash section
if this is your first time working with wood take it one step at a time
sent to the rest British ago feel free to post any questions in the comment
section
and I'll do my best to help out if i cant please keep in mind that this is a
prototype
so there's lotsa built reproved in
I would like to see your videos if you make this to me are using these ideas
especially if you make an improvement to the design
please post a video response I hope this video helps you
and I hope this to me help you as much as it has helped me thanks again for
watching
until next time in