Click here to make tpub.com your Home Page

Page Title: Armature.
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

present and the armature should be replaced.
If the field coils are defective, replace
(g) Check armature for short circuits by the use of
(e) Repair  or  replace  defective  items  as
a growler. Revolve armature in a growler with
a steel strip such as a hacksaw blade held
authorized.
over the core and parallel to the shaft. The
(2) Armature.
blade will vibrate above the short circuit if one
(a) Be certain that all coils are pressed into core
is present.
If an external examination
slots and soldered to commutator risers.
discloses nothing to cause a short circuit, such
(b) Inspect core for deep nicks and cuts.
as foreign material between the bars of the
(c) Inspect commutator for rough surface or other
commutator, the armature is unserviceable.
indications of wear.
(h) To test for out-of-round, place the armature
(d) Inspect shaft bushing seats for wear.
with the shaft on V-blocks and mount the dial
(e) Inspect and test each commutator segment
indicator so that its plunger rests against the
for ground. Use testing device (d(1)(d) above)
commutator. Rotate the armature slowly, and
and proceed as follows: Place the armature
note the variations in thousandths shown on
on a V-block, and touch one test probe to
the face of the dial indicator. The variation is
either the core or the shaft of the armature
the ex-tent to which the armature is out-of-
and the other probe to each commutator
round and is referred to as run-out.  If the
segment.
If a commutator segment is
commutator is more than 0.003 inch out-of-
grounded, the lamp will light.  Using a dry
round, place the armature in a lathe and ma-
brush, a cloth, or compressed air, clean
chine it to proper specifications. Re-move all
between the metal strips on the commutator;
burs with No.  00 sandpaper; then undercut
then retest it. If the segment is still grounded,
the mica.
the armature is unserviceable.
(i) Inspect drive end bearing for roughness.
(f) Check armature for grounding by placing one
(j) Repair defective items as authorized or
test prod on the end of the commutator and
replace generator.
the other test prod on the laminated core or
e. Assembly. Reverse procedures in b above.
AGO 7010A
35

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business