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Table 9-2.  Prisms and Mirrors
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Removing   Cement   from   Lens   Elements.
TM 9-254 9-6. Inspecting Optical Components - Continued Table 9-5.  Objective, Erector Lenses and Windows Estimated Number of Scratch Maximum Number of pits, Size of pits, diameter scratches size length digs, bubbles digs, bubbles up to 1.250 5 60 3/16 4 40 1.251 - 2.000 8 60 1/4 7 40 2.001 - up 10 60 5/16 10 40 Table 9-6.  Reticles ** Estimated Number of Scratch Maximum Number of pits, Size of pits, diameter scratches size length digs, bubbles digs, bubbles up to 1.250 3 60 1/8 3 10 1.251 - 2.000 3 80 3/16 3 20 2.001 - up 3 80 1/4 3 40 ** No scratches, pits, or lint will be permitted in central reticle pattern (etching) or in central area of field lens where it will be superimposed on reticle pattern. Section III.  Reclamation of Optical Components NOTE In    the    following    processes    (decementing,    decoating,    coating,    and    cementing    of    optical components) all lens halves, after being separated, should be kept together. 9-7. Decementing (Separating) Optical Components. a. Reasons for Decementing.  Lenses which are defective because of deterioration of the cement or the coating must be separated for repair. b. Hot Plate Method of Decementing.  This method of decementing incorporates the use of a hot plate placed inside an enclosed containment hood.  The purpose of the containment hood is to reduce the amount of cooler room air coming  in  contact  with  the  heated  lens,  causing  it  to  fracture.    The  procedure  for  decementing  with  this  method  is  as follows: (1) Place a fiberglass cloth over the hot plate heating surface, to protect the lens surface from damage, and preheat the hot plate to 350 to 450 degrees Fahrenheit. Change 2  9-23

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