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Decoating Optical Components (cont) - TM-9-254_296
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Section I.  OPTICAL TEST INSTRUMENTS
TM 9-254 9-10. Cementing Optical Components - Continued (5) Using a cork stopper, move the top convex element in a slight circular motion to remove any air bubbles that  may  have  formed  in  the  cement.    This  also  removes  excess  cement  from  between  the  lens elements. (6) Remove excess cement by wiping the edge of the lens elements with a piece of batiste cloth dampened with acetone. CAUTION Position a piece of plate glass over the top of the surface plate to prevent the lens elements from becoming scratched during the alinement process. NOTE The surface plate and plate glass covering used in step (7) below, must be leveled to prevent the lens elements from shifting during the alinement process. (7) Position the lens elements on top of a leveled surface plate. (8) Aline  the  lens  elements  by  positioning  two  V-blocks,  the  open  jaws  of  the  V-blocks  facing  each  other, against the outer edges of the lens elements. (9) Using the V-blocks, apply a slight pressure to the edge of the lens elements to aline the edges flush with each other. CAUTION Keep oven doors closed during the baking process to prevent the lenses from being exposed to cool air which could cause separation of the lens elements. NOTE o     Allow  cement  to  harden  for  a  period  of  3  to  5  hours  before  attempting  to  move  the  lens elements. o     Baking oven must be level to prevent any shifting of the two lens elements. (10)  Remove the glass plate with lenses from the surface plate and place in the baking oven.  Bake lenses at a  temperature  of  170  to  180  degrees  Fahrenheit  for  a  period  of  4  to  6  hours.    When  baking  time  is completed, turn oven off and allow lenses to cool slowly to room temperature. (11)  After lenses have cooled, remove them from the oven and clean off any excess cement from edge of the lens with a sharp knife or razor blade. (12)  Thoroughly clean lens to remove all cement residue, dirt, and lint. (13)  Inspect for any defects resulting from the cementing process, such as dirt, lint, separation, or air bubbles between the lenses.  Any lens having defects and not meeting the inspection requirements of paragraph 9-6 will have to be separated and recemented. 9-35/(9-36 blank)

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