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Lapping
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 4-47.  Lapping on a Surface Plate
TM 9-254 4-21.  Lapping- Continued (1) The   fact   that   a   movement   binds   or   chatters   is   not   always   an   indication   that   lapping   is   necessary. Disassemble,  wash,  and  thoroughly  inspect  the  parts  before  lapping.    It  is  possible  that  inspection  will reveal a small burr which may be easily removed with a file, scraper, or oilstone.  A good cleaning, followed by proper lubrication, may also be enough to smooth out a movement. b. Lapping,  Using  A  Surface  Plate  (fig  4-47).    Often  it  becomes  necessary  to  insure  that  the  mating  surface  of  a part  is  flat  before  assembly  into  a  piece  of  equipment.    An  example  of  this  would  be  in  the  use  of  the  retainer- 8267736 used in the M145 Telescope Mount.  By using a surface plate, the retainer can be lapped to a flat surface as described below. (1) Position a surface plate on a suitable work surface. NOTE Selection  of  abrasive  material  used  in  the  lapping  process  will  depend  upon  the material makeup of the item being lapped. (1) Select  a  piece  of  emery  cloth,  8  inches  by  11  inches,  and  cover  the  back  side  of  the  emery  cloth  with  an adhesive  material  (two  sided  tape  or  other  suitable  adhesive  that  will  secure  emery  cloth  to  the  surface plate). NOTE Emery cloth must lay flat against the surface plate with no bends or tears allowed in the emery cloth (1) Position the emery cloth (with the adhesive side facing the surface  plate)  on  the  center  of  the  surface  plate and press firmly against the emery cloth to secure in place. (2) Place retainer, with the side to be lapped, on the emery cloth and begin the lapping process.  Apply even, firm pressure on the retainer and move retainer in a figure eight fashion across the emery cloth. (3) After  making  two  or  three  passes  across  the  emery  cloth,  remove  the  retainer  and  inspect  the  side  being lapped.      If   the   retainer   is   flat,   abrasive   marks   will   appear   across   the   entire   surface   of   the   retainer. Intermittent abrasive marks across the surface being lapped indicates the need for further lapping. (4) If further lapping is necessary, repeat steps (4) and (5) above until a flat surface is obtained as described in step (5). (5) After  the  lapping  process  is  completed,  wash  the  retainer  in  Dry  Cleaning  Solvent  to  remove  all  abrasive particles. Change 6  4-51

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