Specifications

MILATD-1472E
5.4.2.2 Continuousadjustmentrotary
controls.
5.4.2.2.1 Knobs.
5.4.2 .2.1.1 ~. Knobs should be used when low forces or precise adjustments of a
continuous variable are required. For most tasks, a moving knob with fixed scale is pmfemd over a
moving scale with f~ed index. If positions of single revolution controls must be distinguished, a
pointer or marker should be available on the knob.
5.4.2 .2.1.2 Dimensions, toraue and semration. The dimensions of knobs shall be within the
limits specified in Figure 7. Within these ranges, knob size is relatively unimportant provided the
resistance is low and the knob can be easily grasped and manipulated. When panel space is extremely
limited, knobs should approximate the minirniirn values and should have resistance as low as possible
without permitting the setting to be changed by vibration or mere]y touching the control. Resistance
and separation between adjacent edges of knobs shalJ conform to Figure 7.
5.4.2.2.2 Ganxed controi knobs
5.4.2 .2.2.1 Amikation. Ganged knob assemblies maybe used in limited applications when
panel space is at a premium. Two-knob assemblies= prefemxi. Three-knob configurations should
be avoided. Ganged knob configurations should not be used under the following conditions:
a.
b.
c.
d.
Extremely accurate or rapid operations are required.
Frequent changes are necessary.
Heavy gloves must be worn by the operator.
Equipment is exposed to the weather or used under field conditions.
5.4.2 .2.2.2 Dimensions and separation. Dimensions and separation
shouldconformto
Figure 8.
5.4.2 .2.2.3
Resistamz. ReWance shall conform to requirementsin Figure 8. Knobsshould
be serrated. Fine serrations shouldbe usedon precise adjustmentknobs;coarse smations shouldbe
used on gross adjustment knobs.
5.4.2 .2.2.4 Marking. An indexing mark or pointer shall be provided on each knob. Marks or
pointers should WTer sufficiently to make it apparent which knob indexing mark is being obsexved.
5.4,2 .2.2.5 KnobMisphrymModliP. whenelwhknobofa ganged a9sembiymuet bemkUed
to an array of visual displays, the knob closest to the panel shall relate to the left-most display in a
horizontal array, or the qqxwmost display in a vertical array (see F@ure 8).
5.4.2 .2.2.6 lnaclvettent opemtim When it is critical to pwent inadwrtent operation of one
knob as he other is being ad@&@ a secoadq knobcontrol wtion s&U be required(e.g., PMXS@I
the top knob befotv it can be engaged with its control shaft). Where inadvertent movement is
undesirable but not critical, knob diameter/depth tdationships should be optimized as shown in Figure
8. Contrasting cotms
bmvecnknobs mayaisobetlscdt omlpmveicnd?~.
5,4.2.2.3 Continuous adjustment thumbwheel controls.
5,4.2 .2.3.1 Use. Continuously iidjusdie thumbwhtzl cun~ols may be used as an alternative to
rc~t:i~knobs when [he :lpplication \\’illbenefit from the compaclnes~ of thethumhwheel device
~: