Simultaneous Motion Cycle:

It is sometimes  required  to record in  minute  detail the  simultaneous  movement    of the different    parts of  the body  of an  operator  during  the performance  of a single cycle  of operation  the cycle  time of  which is  very small. This  is done with the  help  of a SIMO( simultaneous Motion Cycle ) chart . it  is a two  handed  process chart on a common time scale designed to fulfil the function. If  the movements are so fast  that the naked  eye  of the operator cannot follow them a cine camera is employed to film the work. The film   is then analyzed by projecting it  as slowly as desired and recording on  a common  time scale  the  simultaneous   and specific diversions of movements performed by the operator. While recording it  makes  use of the  therblig symbol  which  represent the  elementary  movements of human  activity.