Marking Out

MARKING OUT Marking out  is  the scratching of  lines on  the surface of a workpiece, 

known as scribing, and is usually carried out only on a single workpiece or  a small number of workpieces. The two main purposes of marking out are: •  to  indicate the workpiece outline or  the position of holes, slots, etc. 

If the excess material will have to be removed, a guide is given for the  extent to which hacksawing or filing can be carried out;

•  to  provide  a  guide  to  setting  up  the  workpiece  on  a machine.  The  workpiece is set up relative to the marking out and is then machined.  This  is  especially  important  when  a  datum  has  to  be  established  when castings and forgings are to be machined.