2. CONTROLS : activators
* TRANSMIT INPUTS TO A PIECE OF
EQUIPMENT AND THEY ARE USUALLY
OPERATED BY HAND OR FOOT.
1940’ “K n o b s
s a n d d ia l s
and er a”
1950’
s
3. Control actions:
1.Active or shut down
equipment.
2.Make a “discrete setting”.
3.Make a “quantitative
setting”.
4.Apply “continuous
control”
8. CONTROL SELECTION
❶ The type of control shall be compatible with
stereotypical or common expectations.
❷ Size and motion characteristics of control shall be
compatible with stereotypical experience and past
practice
❸ The direction of operation of a control shall be
compatible with stereotypical or common expectations.
❹ Operations requiring fine control and small forces
shall be done with the hands, while gross adjustments
and large forces are usually exerted with the feet.
❺ The control shall be safe in that it will not be
operated inadvertently or operated in false or excessive
ways.
10. Direction of control movements
Forward Counter
Effect Up Right Clockwise Press Down Left Back clockwise Pull Push
On 1 1 1 1 2 1
Off 1 2 1 2
Right 1 2
Left 1 2
Raise 1
Lower 2 1
Retract 2 2
Extend 1 2 2
Increase 2 2 1 2
Decrease 2 2 2
Open
valves 1
Close
valves 1
Legend: 1 means most preferred, 2 less preferred.
16. 1 O n e d im e n s io n a l
s t e e r in g
2 T w o d im e n s io n a l
s t e e r in g
3 P r im a r y v e h ic le
b r a k in g
4 P r im a r y v e h ic le
a c c e le r a t io n
5 S e le c t io n o f a
t r a n s m is s io n g e a r
17. Arrangement &
grouping of controls
LOCATE FOR EASE OF OPERATION
PRIMARY CONTROLS FIRST
GROUP RELATED CONTROLS TOGETHER
ARRANGE FOR SEQUENTIAL OPERATION
BE CONSISTENT
DEAD-MAN CONTROL
GUARD AGAINST ACCIDENTAL
ACTIVATION
PACK TIGHTLY, BUT DO NOT CROWD
