45
STAGE 9:
BUILDING ROBI’S
RIGHT FOREARM
In this stage you will assemble the main part of Robi’s right
forearm, and add his elbow and thumb. The assembly includes
installing the servo motor that forms Robi’s elbow joint.
To give Robi arm movements similar
to a human, his elbow and shoulder
joints are fitted with servo motors, and
his right forearm is assembled around
the elbow servo. But first, you will
begin putting together Robi’s hand.
(Although Robi does not have movable
wrist joints, his fingers and separate
thumb are held together by a spring,
allowing him to hold thin objects.)
ASSEMBLY GUIDE
1
2
3
4
1 Right forearm frame
2 Servo front panel
3 Elbow joint
4 Right thumb
5 Right finger mount
6 M2 x 5mm pan-head screws (x 2)
7 M2 x 10mm pan-head screws (x 3)
8 M2 x 8mm countersunk screws (x 3)
9 M2 x 6mm countersunk screws (x 4)
You will be using parts from the
previous stages, so be sure to have
these to hand before beginning.
SAVED PARTS
YOUR PARTS
5
6
7
8
9
PARTS TO BE
ASSEMBLED
Right forearm (Stage 7)
Servo motor (assembled in Stage 8)
