TM 9-243TYPES AND USESThere are two basic types of punches; solid (1) whichare the most common, and hollow (2) which are usuallydesigned for punching holes in leather, paper, and othersimilar materials. Solid punches are used to mark metal,drive pins, align holes and to do other similar jobs.CENTER PUNCHESThere are two types of center punches, both used forstarting drill holes.The hand-held type has a narrow, cone-shaped pointterminating in a sharp, conical tip. Hand-held types;range from 1/8 to 5/8 inches in diameter and from 3 to 6inches long. The hand-held punch must be struck with ahammer.The automatic type has an adjustable regulator fordetermining the impact of the punch and also has inter-changeable points. The automatic punch contains atension spring for marking without the use of a hammer.DRIFT PUNCHThe drift punch has a narrow, tapered flat point. Thepoints range in size from 1/8 to 1/2 inch in diameter withan overall length from 7 to 9 inches. Drift punches maybe used to remove shafts, pins, rivets (after heads havebeen removed), and to align small parts.ALIGNMENT PUNCHThe alignment punch has a narrow, tapered flat point.The points range in size from 1/8 to 1/2 inch in diameterwith an overall length of 12 to 15 inches. Alignmentpunches are used to line up mating parts for assembly.Make sure the punch is large enough for the job. Apunch that is too small may bend or break.DRIVE PIN PUNCHThe drive pin punch has a flat tip which may be tapered.Points may range in size from 0.03 to 1/2 inch and arefrom 3 to 6 inches long. Standard drive pin punchesusually come in sets of nine. Drive pin punches are usedto remove straight or tapered pins. Make sure the rightsize punch is used for the pin being removed.PRICK PUNCHThe prick punch has a long, conical-shaped point andranges from 4 to 5 inches in length overall. It is used tomark soft metal.27-2
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