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Chapter 27 Punches
Types and Uses - Continued - 14256_179

Tools And Their Uses - Hand tools and what they are used for
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TM 9-243 TYPES AND USES There are two basic types of punches; solid (1) which are  the  most  common,  and  hollow  (2)  which  are  usually designed  for  punching  holes  in  leather,  paper,  and  other similar  materials.  Solid  punches  are  used  to  mark  metal, drive pins, align holes and to do other similar jobs. CENTER  PUNCHES There are two types of center punches, both used for starting drill holes. The hand-held type has a narrow, cone-shaped point terminating in a sharp, conical tip. Hand-held types; range from 1/8 to 5/8 inches in diameter and from 3 to 6 inches  long.  The  hand-held  punch  must  be  struck  with a hammer. The automatic type has an adjustable regulator for determining  the  impact  of  the  punch  and  also  has  inter- changeable points. The automatic punch contains a tension spring for marking without the use of a hammer. DRIFT  PUNCH The drift punch has a narrow, tapered flat point. The points range in size from 1/8 to 1/2 inch in diameter with an  overall  length  from  7  to  9  inches.  Drift  punches  may be  used  to  remove  shafts,  pins,  rivets  (after  heads  have been removed), and to align small parts. ALIGNMENT  PUNCH The alignment punch has a narrow, tapered flat point. The  points  range  in  size  from  1/8  to  1/2  inch  in  diameter with an overall length of 12 to 15 inches. Alignment punches  are  used  to  line  up  mating  parts  for  assembly. Make sure the punch is large enough for the job. A punch that is too small may bend or break. DRIVE  PIN  PUNCH The drive pin punch has a flat tip which may be tapered. Points may range in size from 0.03 to 1/2 inch and are from 3 to 6 inches long. Standard drive pin punches usually come in sets of nine. Drive pin punches are used to remove straight or tapered pins. Make sure the right size punch is used for the pin being removed. PRICK  PUNCH The prick punch has a long, conical-shaped point and ranges from 4 to 5 inches in length overall. It is used to mark soft metal. 27-2







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