PASCO SE-8657 MOTOR ACCESSORY - Manual (Page 9)

5
012-06247A Motor Accessory
¨
400
400
Motor Accessory onto the Coils and Cores
Set
➀
Begin with the U-shaped core, with the coils and
any other parts removed. The smaller threaded
portion of the shaft screws easily into the threaded
hole in the core so the shaft is between the poles of
the core. Use the wrench provided to tighten the
shaft by gripping the flats on the larger threaded
portion. The small wrench limits the torque that
can be applied. If an ordinary wrench is used, be
careful not to over tighten.
ä
Note: Do not discard the small wrench; it
is essential as a retaining nut when the Motor
Accessory is used with the Variable Gap
Magnet.
➁
Working from above, press the brush holder
onto the smooth, enlarged portion of the shaft.
Apply increasingly firm pressure equally to each
side of the brush holder while rotating the brush
holder back and forth. If this action loosens the
shaft, tighten it as described in step 1. Check to
be sure the brush assembly is seated as far down
on the shaft as it will go. Orient the brush
holder perpendicular to the base of the Coils and
Cores apparatus.
➂
Place the two 400-turn coils from the Coils and
Cores Set onto the poles of the core.
➃
Gently lower the armature onto the shaft. The split
ring commutator should be down for use as a uni-
versal motor. Carefully rotate the armature back
and forth to separate the brushes and allow the
commutator to slip down between them. If neces-
sary, insert a pencil or similar object between the
brushes to separate them. Use only the most deli-
cate force to avoid bending the brushes and neces-
sitating adjustment or repairs.
Motor Accessory—Coils and Cores Assembly
U-shaped base
400-turn coil
split ring commutator