TM 5-6675-270-15
Section XI. OPTICAL PLUMMET
ing solvent and dry thoroughly. Clean the lenses
6-41. General
and prisms with grain alcohol or acetone.
The optical plummet prism, reticle, and magni-
b. Inspection. Inspect the lenses and prisms
fying lens assemblies with associated sleeves and
for scratches, chips, and cracks. Inspect all
housings, comprise the optical plummet. The
threaded parts for worn or damaged threads.
inner vertical axis of the theodolite houses the
Inspect the prism housing and lens holder tubes
optical plummet.
for cracks, burs and breaks.
6-42. Disassembly
c. Repair. Remove all burs. Replace defective
parts that cannot be repaired.
6-44. Assembly
assemble the optical plummet.
the optical plummet.
a. Cleaning. Clean all metal parts with a clean-
Section XII. OPTICAL PLUMMET EYEPIECE ASSEMBLY
ing solvent. Clean the lens with lens tissue
6-45. General
moistened with grain alcohol or acetone.
The optical plummet eyepiece assembly is located
b. Inspection. Inspect the lens for scratches,
on the front of the U-frame near the bottom. It
chipping, and cracks. Inspect all threaded parts
enables the operator to center the instrument
for worn or damaged threads. Inspect the lens
accurately over the station point.
holder tube for burs, dents, cracks, and breaks.
c. Repair. Remove all burs. Replace defective
6-46. Disassembly
parts that cannot be repaired.
Refer to figure 59 and remove and disassemble
the optical plummet eyepiece assembly.
6-48. Assembly
the optical plummet eyepiece assembly.
a. Cleaning. Clean all metal parts with a clean-
Section XIII. INNER VERTICAL AXIS
6-49. General
a. Cleaning. Clean all metal parts with a clean-
The inner vertical axis is fastened to the bottom
ing solvent. Clean the 25 bearing balls with a
of the U-frame and serves as the pivot upon
lint-free cloth moistened with a cleaning solvent.
which the U-frame turns. It provides mounting
for the optical plummet described in paragraph
b. Inspection. Inspect the axis for damaged
6-41. The inner vertical axis also houses two
threads, burs, nicks, and wear. Inspect the bear-
adjusting screws and spring-actuated pins which
ing balls for flat spots, roughness, and other signs
are used to position and hold the optical plumb
of wear.
prism in alinement.
c. Repair. Remove all burs and nicks. Chase
threaded parts having minor thread damage.
6-50. Disassembly
6-52. Assembly
vertical axis.
inner vertical axis.
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