Creative Engineering ROCK-A-FIRE EXPLOSION - Page 99

The Arms and Shouldes Cont.
F. The Elbow Twist Movement (See Drawing Page 3-066) is basically
the same as the Arm Twist movement. A cylinder moves an
actuation lever which turns a twist rod attached to the lower
arm. For any problems in the Elbow Twist follow the same steps
as in the Arm Twist. (Steps B,C and D) The biggest difference
between the 2 types of Twist Movement, is that the shoulder is
hinged to bend and to twist, but the elbow is only designed to
twist. So where a Elbow Twist movement is used a Elbow Bend
movement is not.
G. The Elbow Bend movement used for Fatz and Dook is different
than the Elbow bend, for Rolfe's left arm and both of Mitzi's
arms. (See Drawing Page 3-067)
H. Fatz's and Dock's Elbow Bend movement; (See Drawing Page 3-067)
if after trouble shooting you have found a problem being either
loose mounts or broken parts:
1. For any problems in the cylinder, including the rear mount
bushing, refer to Pages 3-009 thru 3-011, and all drawings
referred to by that text.
2. If the pivot bushings (A) wear out and need replacement:
a. Disassemble the Elbow cylinders front mount from the
lower arm. Remember to note the assembly prior to
disassembly.
b. Remove the Shaft Collar (B) from the lower arm mount
Collar Pin. Remove the lower arm from the character
and bring the arm to the Technical Room.
c. The bushing used in Fatz's and Dock's lower arm is a
1/2" I.D. x 5/8" O.D. x 1/2" long Flange Bushing.
(Part #28-030-070) Put the lower arm in a vise and
drill out the worn bushings, using a 39/64" Drill. Hold
the drill as straight as possible to tbe hole.
d. Press in the new bushings using an Arbor Press. If one is
not available place a piece of wood on the bearing to
protect it and tap in the new bushings using a hammer,
Hand Ream the bushing.
e. Re-assemble the lower arm onto the character, using the
same hardware previously removed, and set the critical
adjustments.
3-062