Component Engineering STRD-30C, Manual

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2
Assemble the locator plate and adaptor block
Insert the screws loosely
Use the bearing to center the assembly
As you begin the installation please refer to the drawings on the
left. Assemble the locator plate and adaptor block by slipping the 2
holes in the locator plate over the 2 pins in the adaptor block.
Position the locator plate’s large hole over the sound drum’s ball
bearing seat and hold in place with three 8-32 x 1/2" screws
through the holes on the right side of the plate. Do not tighten
these screws.
The three mounting holes in the adapter block will now be over the
tapped holes originally used to mount the slit lens holder in the
casting. Install the three 8-32 X 1/2" screws but do not tighten.
The reason for all this loose mounting is so that we can get all of
the
optical pieces properly aligned exactly on radius with
reference to the center line of the sound drum. You are going to
use the outboard sound drum bearing to accurately position the
locator plate, and then all the other parts will automatically be
aligned. The idea is to slide the bearing through the large hole in
the locator plate and still be part way into the bearing seat. With
the bearing partly in the plate and partly in the bearing seat, the
plate will be positioned exactly on center with respect to the sound
drum.
Now you can tighten the three screws which hold the plate, the
three screws in the adapter block, and begin reinstalling the sound
drum and flywheel. Remove the rear bearing, discard the spring
washer that is behind it and reinstall the bearing. Now you can
install the scanning drum. Insert the wave washer provided in the
kit between the rear bearing and the locking collar. Compress the
washer lightly and lock down the collar.