FRIDEN STW - Page 15

15-50 FRIDEN CALCULATING MACHINE CO.. INC. Page 15
CHAPTER 2. BASIC ADJUSTMENTS — NONSEQUENCE
14, GOVERNOR - ALL FRIDEN MOTORS: Set
Governor A on Motor Shaft with approximately
1/32°' clearance between Governor Rings and
Governor Brush Holders B, as shown.
CLEAN BETWEEN RINGS
wo ot
FAST SLOW ay OG
18. GOVERNOR ADJUSTMENT AND MACHINE
SPEED: Machine Speed, all ‘*W"' Models, is 495
not to exceed 500 revolutions per minute, To in-
crease machine speed, turn Adjusting Screw A
IN. To decrease machine speed, turn Screw A
ouT.
MOTOR TROUBLES: Motor failure: Motor fails
torun atall; first, check Cord and Plugs to elec-
tric outlet; checkGovernor Brushes for sticking;
Commutator Brushes; check Switch and Wiring.
Motor continues to run: check Switch, and if in
good order and not sticking, thenthe chances are
that the Capacitor is shorted and must be re-
placed.
Motor runs at excessive speed: Capacitor is
shorted and must be replaced. Never allow ma-
chine to be run at this speed. When this condi-
tion is found in a machine, always check the
Genevas for burred points and for proper setting:
the excessive speed may have damaged them.
Motor runs but iserraticin speed: check Gover-
nor Brushes for sticking; also check Gommuiator
Brushes; check Governor Points.
Motor runs partof the time buthas a‘'dead"’ spot
where itwillnotstart: check for sticking Brush~
es. If Brushes are in good arder, chances are
there is a dead coii, and it will be necessary ta
MODEL STW
replace the complete Motor.
MOTOR GARE: The Friden Motor requires little
attention. Care should be exercised in lubricat-
ing and it is recommended that the Motor be lu-
bricated only about once every six months or so,
and then only one drop of light oif in each of the
Shaft Bearings. Excess oi! tends to foul the Com-
mutator and Governor Brushes, causing exces-
sive burning and arcing. This is also one of the
causes of Brushes sticking and of Motor failure.
MOTOR ADJUSTMENT: When replacing a Motor,
it is necessary to adjust or align the Motor with
the Drive Pinion Shaft Coupling. A good method
to abtain perfect alignment is to leave the Motor
Screws loose enough so the Mator may be shift~
ed slightly by hand; then with Motor running, move
Motor by hand until the point of least vibration
is reached; then tighten the Screws firmly. Aft-
er Screws are tightened, power off, try turning
Motor by hand; it should be perfectly free.
GOVERNOR CARE: Governor Contact Rings
should be kept polished and smooth, This may
be done by using Crocus Cloth or very fine sand-
paper. In cases where the Governor Rings are
badly scored and pitted, it is advisable to re-
place them with new or re-built Governor. If oil
and dirt appear on the Governor, it shauld be
removed and thoroughly washed in cleaning fluid.
After cleaning or polishing the Governor Contact
Rings, usea stiff brush to clean between the Rings
to remove any foreign matter that might cause
arcing or burning between them.
Governor Contact Points may need some atten-
tion; and in cases where pitting is not very se-
vere, they may be filed or stoned to a smooth
surface, If Points are badly pitted, Governor
should be replaced.
NOTE:
Damaged
Motors
and
Governors
may
be
returned
to
the
factory
in
San
Leandro
where
they
will
be
rebuilt
at
a
nominal
cost.
b. COVERS