instruments usually found in a machine shop. The job of restoring machinery to good working order may  range  from  making  a  simple  pin  or  link  to the  complete  rebuilding  of  an  intricate  gear system. Often, without dimensional drawings or other  design  information,  a  Machinery  Repair- man must depend on ingenuity and know-how to machine  a  repair  part  successfully. Molder (ML) MOLDERS   operate  foundries  aboard  ship and at shore stations. They make molds and cores, rig  flasks,  prepare  heats,  and  pour  castings  of ferrous, nonferrous, and alloy metals. They also shake out and clean castings and pour bearings. Instrumentman (IM) INSTRUMENTMEN  perform  preventive  and corrective   maintenance   and   calibration   on mechanical instruments and standards and Navy timepieces.   They   use   Navy   or   mechanical instrument repair and calibration shop (MIRCS) procedures. Opticalman  (OM) OPTICALMEN   perform   preventive   and corrective   maintenance   on   small   navigational instruments, binoculars, gun sights, range finders, submarine  and  turret  periscopes,  night  vision sights,  and  other  optical  instruments. Patternmaker (PM) PATTERNMAKERS  make wooden, plastic, plaster, and metal patterns used by Molders in a Navy  foundry.  They  mount  patterns  on  match- board/match   plates   for   production   molding. Patternmakers  make  master  patterns,  full-scale layouts   of   wooden   patterns,   coreboxes,   and templates.  They  also  index  and  store  patterns. SAFETY  PROGRAM The  objective  of  the  Navy’s  Safety  Program is to enhance operational readiness by reducing the  frequency  and  severity  of  on-  and  off-duty mishaps  to  personnel  and  the  cost  of  material  and property damage attributed to accidental causes. The use of the term  safety  program  in  this  chapter signifies  both  occupational  safety  and  health. Operating  and  maintenance  personnel  must  be familiar with technical manuals and other publica- tions  concerning  equipment  they  are  working with. Personnel must continuously exercise good judgment and common sense in the setting-up and operation of all equipment to prevent damage to the  equipment  and  injury  to  personnel. Personnel can prevent damage to machinery by  properly  preparing  and  operating  the  equip- ment  by  following  instructions  and  procedures outlined in the EOSS (which is discussed later in this  chapter)  and  by  being  completely  familiar with  all  parts  and  functions  of  the  machinery. You  can  prevent  damage  to  the  ship  by operating  the  machinery  so  no  loss  of  power occurs  at  an  inopportune  time,  by  keeping  engines ready  for  service  in  any  emergency,  and  by preventing hazardous conditions that may cause fire  or  explosion.  Always  maintain  fire-fighting equipment  in  a  “ready  to  use”  state. You can prevent injury to personnel by having a thorough knowledge of duties, by knowing how to properly handle tools and operate equipment, by observing normal precautions around moving parts,  and  by  receiving  constant  training. Other  everyday  safety  habits  you  should follow include (1) preventing the accumulation of oil in the bilges or other pockets or foundations and subbases; (2) taking care, particularly when on an uneven keel, that water in the bilges does 1-8