A motion is an
act of moving a body part. Fewer motions decrease the time and energy required
to complete an operation. Using the work aid or changing the method can often
eliminate motion. Motion can be shortened by arranging the work station so all
parts are easily accessible and as close to the operator as possible.
Principles of Motion economy
It is always
difficult for beginners to decide on the best method. Yet another mnemonic is
useful to make sure that nothing is missed. This is ‘MISS CHURN’.
M The extend of a movement should be keep
to a minimum
Finger Best
Fingers
Hand
Forearm
Arm
Body
Working about Worst
S The body
naturally adjusts to counterbalance any movement of its parts. Ideally one
useful movement should be matched by another, so that they are symmetrical.
S Where
possible, movements of the arm and of the other parts of the body should occur
together. That is, they should be simultaneous.
C Jerky movement is tiring and
unproductive. For the best result movements should be continuous.
H With practice,
we can do the same job with the minimum effort. If the tools and parts are
always in the same place the method become habitual.
U Restricted
movement is more tiring that unrestricted movement. Work aid can
often reduce the control that the operative must exert and so make the work
less tiring.
R Rhythmic movement is
natural movement. Nevertheless, some operatives build their jobs unnecessary
movements which, however rhythmic, are wasteful.
N The easiest
way is the natural way. Training builds up co-ordination; the best way
becomes the natural way.
Objective of motion analysis
Apparel
production engineer analyze motion strive to:
1. Reduce the motion required
2. Shorten the motion
3. Simplify motion
4. Reduce control needed to complete a motion or element of an operation
1. Reduce the motion required
2. Shorten the motion
3. Simplify motion
4. Reduce control needed to complete a motion or element of an operation