Olympus BH2 Series 완전한 분해, 청소 및 재조립 - 페이지 8

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Olympus BH2 Series에 대해서도 마찬가지입니다: 문제 해결 및 조정 매뉴얼 (46 페이지), 완전한 분해, 청소 및 재조립 (23 페이지), 분해, 청소 및 재조립 (45 페이지), 매뉴얼 (6 페이지), 설치 매뉴얼 (9 페이지)

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of the four quadrants of the cross-point depression (see

Figure

1).

Figure 1 – Head of a typical JIS screw

Supplies Needed

The following supplies will be needed to complete the

teardown, cleaning, and reassembly of the coaxial focus

mechanism in a BH-2 microscope stand.

• Cleaning solvents (see recommendations below)

• Loctite® 242 blue thread locker (item S2 of

• Loctite® 222 purple thread locker (item S3 of

• Lubricants (see recommendations below)

Recommended Lubricant Types

Either Plastilube® Brake Grease (item S1 of

or Mobilith SHC

220 synthetic grease (item S4 of

Appendix

3) is recommended for use in the BH-2 coaxial

focus mechanism. These medium-consistency (NLGI2)

greases will remain stable and serviceable for many

years to come.

Recommended Solvents

Some sort of cleaning solvent will be needed to remove

the old grease from the various mechanical parts of the

coaxial focus mechanism. The list of solvents that can

be used include acetone, diethyl ether, heptane,

hexane, mineral spirits, turpentine, and xylene.

Regardless of which solvents are chosen, make sure

that adequate ventilation is present during the cleaning

process and that any necessary personal protective

equipment is utilized to minimize your exposure to the

solvents and their vapors. Consult the relevant safety

data sheet (MSDS or SDS) before using any unfamiliar

solvents.

Many of the solvents listed above are

flammable and their vapors may represent an explosion

hazard if mishandled. Whichever solvents are chosen

for the job, be sure to follow all of the manufacturer's

instructions and safety precautions when using and

storing the solvents. Acetone works well for Plastilube®

and mineral spirits works well for SHC

Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism

Appendix

220 grease.

Solvent Compatibility with Painted Surfaces

Many solvents will damage the finish of painted

surfaces.

Isopropyl alcohol or 409 Cleaner may be

safely used to clean most painted surfaces.

Solvent Compatibility with Metal Parts

The solvents listed above are generally compatible with

the various unpainted metal parts. If unsure, minimize

the exposure time with the solvents by not soaking the

parts any longer than necessary to loosen the old

grease.

Solvent Compatibility with Plastic Parts

Many solvents will dissolve or damage plastic parts. Be

careful when cleaning the focus knobs and the pre-

focus lock collar, to prevent damage from solvents.

Even a very brief exposure to an incompatible solvent

can disfigure plastic parts. Regardless of which solvents

are chosen, minimize the time that the cleaning

solvents are in contact with plastic parts (i.e., do not

soak them in the solvent) and test for solvent

compatibility by applying a small amount to an

inconspicuous place, such as inside a knob, first. Never

use xylene, isopropyl alcohol or trichloroethylene to

clean nylon parts.

Xylene dissolves nylon, whereas

isopropyl alcohol and trichloroethylene will cause

swelling of nylon due to solvent absorption. The list of

solvents generally considered safe for nylon includes

acetone, diethyl ether, heptane, mineral spirits,

naphthalene, and turpentine.

Servicing the Coaxial Focus Assembly

Remove the Accessories from the Stand

Before beginning the teardown, remove all the major

components from the microscope stand (i.e., AC power

cord, condenser, x-y stage, eyepieces, viewing head,

objectives, and nosepiece, if applicable). This will make

the stand easier to maneuver and will prevent

inadvertent damage to these components during the

teardown and reassembly process. Be sure to protect

these components from dust and damage while they

are not installed on the stand.

Protect the Exposed Mounting Dovetails

Once the various accessories have been removed from

the stand, cover the top of the microscope pillar arm

(i.e., the exposed mounting dovetails for the viewing

head and nosepiece, if applicable) with a clean plastic

bag and secure this with a rubber band or adhesive tape

to keep dust out (see

important on BHSU and BHTU stands, which have an

optical correction lens located just below the viewing

head to correct for the difference in tube length

introduced with the reversed nosepiece.

Figure

2).

This is especially

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