Olympus BH-2 BHS Complete Teardown, Cleaning, And Reassembly - Page 20
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Appendix 1 – How to Install Guide Rails in the Sliding Focus Block Mechanism
Placement of Guide Rails in the Side Grooves
During reassembly of the sliding focus block
mechanism, the guide rails must be seated into the
inside corners of the side grooves in the various
components (i.e., the guide block, the focus block, and
the arm casting). Note that the guide rails are
manufactured such that their cross‐sectional profile
forms a right‐triangle, as can be seen in the end view
shown in
Figure
61. It is critical when installing these
rails that they be placed such that the two sides which
form the 90° angle are placed into the 90° inside
corners of the side grooves, and that the side that forms
the hypotenuse is facing outwards, providing a suitable
low‐friction surface for the cylindrical rollers to roll on.
Figure 61 – Correct orientation of the guide rails
Holding the Guide Rails in Place for Reassembly
During reassembly of the sliding focus block
mechanism, the guide rails will need to be held in place
in the focus block, guide block, and arm casting until the
slide mechanism has been fully reassembled. The guide
rails do not need to be permanently staked in place,
since the cylindrical rollers will hold the guide rails in
place once the slide mechanism has been fully
reassembled. Accordingly, do not use any adhesive to
secure the guide rails in place, otherwise the adhesive
could end up on the exposed bearing surfaces of the
guide rails, which would interfere with the cylindrical
rollers and prevent free motion of the sliding focus
block. Rather than utilizing adhesive, the guide rails
should instead be held in place during reassembly by
applying heavy grease to both ends of the side grooves
in the slide parts (in the inside corners) and then
pressing the guide rails firmly into this grease as they
are reinstalled into position, making sure to properly
orient them per the profile view in Figure 61. After the
guide rails have been placed in position and pressed
into the heavy grease, any visible grease should be
thoroughly removed before proceeding with the
Complete Teardown, Cleaning, and Reassembly of the Olympus BH‐2 Sliding Focus Block
reassembly of the sliding focus block mechanism. Refer
to the following detailed procedure for the suggested
installation method for the guide rails.
Reinstalling Guide Rails into the Guide Block
This procedure describes the suggested method to be
used to install the guide rails into the various parts (i.e.,
the guide block, the focus block, and the arm casting) of
the sliding focus block mechanism. The guide block is
used in this specific example, but the same procedure
applies to the focus block and to the arm casting as
well.
Clean the Old Grease from the Slide Parts
Use a suitable solvent (e.g., acetone) to clean all traces
of oil or grease from the guide rails (see Figure 62) and
from the side groove of the guide block (see Figure 63).
Figure 62 – Thoroughly clean the guide rails
Figure 63 – Thoroughly clean the guide block
Apply Heavy Grease to Both Ends of the Guide Block
Apply a heavy grease (item 6 of
inside corners of both ends of the side groove in the
guide block (see Figure 64).
Appendix
2) to the
Revision 2
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