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Decoating Optical Components (cont) - TM-9-254_295
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Decoating Optical Components (cont) - TM-9-254_297
TM 9-254 9-9. Coating Optical Components - Continued (29)  Monitor  SUBSTRATE  TEMPERATURE  GAUGE  (2)  until  a  temperature  of  approximately  200  degrees Fahrenheit is obtained and then open SYS VENT valve (17) to release vacuum from bell jar (1). (30)  Place HOIST switch (22) in the UP position and allow bell jar (1) to raise completely. WARNING Protective gloves should be worn to prevent burn injuries when removing items from the bell jar. (31)  Remove holding fixture cover (2, fig. 9-31) from support ring (4, fig. 9-31) and cover lens elements with batiste cloth. (32)  Remove holding fixture (3, fig. 9-31) from support ring (4, fig. 9-31) and place on a table to cool. (33)  Place HOIST switch (22) in the DOWN position and lower bell jar (1) completely. 9-10. Cementing Optical Components. WARNING Use adhesives in a well ventilated area away from open flames.  Adhesives are harmful to skin and clothing, can burn easily, and may give off harmful vapor. a. Preparing  the  Cement.    Optical  cement  is  a  thermosetting  cement  consisting  of  two  parts,  a  polymerizable resin mixture and a catalyst.  Using an eye dropper mix 100 parts of HE-80, part A with 1 part of HE-80, part B into a glass bottle.  Using the eye dropper mix the two parts thoroughly. b. Cementing. (1) Remove matching set of lens elements from coating rack and remove all traces of dust and lint using a watchmaker’s  blower.    If  dust  and  lint  cannot  be  removed  by  this  method,  clean  the  elements  with acetone and lens cleaning tissue. (2) Place the concave element on a piece of black felt paper with the concave surface up. (3) Apply  optical  cement  to  the  center  of  the  lens  surface  with  an  eyedropper.    The  amount  of  cement needed will vary with the size of lens.  Usually only a few drops of cement are required. (4) Make sure the matching convex element is clean and position it on the concave element.  Apply a light downward pressure to spread the cement evenly between the elements. Change 2  9-34

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