OO-R-2853
3.12.4 Vibrating mechanism. A variable frequency vibrating mechanism,
providing not less than two speeds or two amplitude selections, shall be
provided. The vibrating mechanism shall provide a frequency of not less than
1400 vibrations per minute (vpm). When operating at the manufacturer's
recommended maximum continuous frequency, the centrifugal force (CF) generated
by the vibrating mechanism shall be not less than 23,000 lb (10 432 kg). The
following formula shall be used to compute CF requirement specified herein:
where,
centrifugal force
CF
-
w
-
weight of eccentric revolving body in lb
mean radius in inches
r
-
number of revolutions per minute (rpm)
n
-
All rotating shafts shall be mounted on heavy-duty antifriction type bearings.
The vibrating mechanism shall be driven by hydraulic power furnished by the
roller's engine. Controls for all functions of vibratory modes shall be located
in the operator's station.
The roller shall be provided with an operator's
3.13 Operator's station.
station, furnished with all controls and applicable accessories/instruments (see
3.11.1). The roller shall be furnished with a ROPS with canopy, conforming to
SAE J1040, and a padded operator's seat with a restraint system conforming to
SAE J386. All instruments shall be visible from the normal operating position.
All controls shall be within reach of the operator when in the normal operating
position. Steps or ladder rungs and handholds shall be furnished as necessary
to provide safe and easy access for the operator to the station. The station
deck and steps shall have an antiskid surface. The station shall be isolated
from the vibrations generated by the vibrating mechanism.
3.14 Toolbox. A tool storage box or compartment of sufficient size to hold
any tools as required to perform daily operations shall be furnished with each
roller. When daily operation of roller may be completed without tools, a
toolbox is not required.
3.15 Lifting and tiedown attachments. When specified (see 6.2), the roller
shall be equipped with lifting and tiedown attachments. Lifting and tiedown
attachments shall conform to type II or type III of MIL-STD-209. Lifting
attachments shall be designed to preclude the use of spreader bars. A
nonferrous transportation plate shall be provided and mechanically attached to
the roller. Transportation plates shall be inscribed with a diagram showing the
lifting attachments and lifting slings, the capacity of each attachment, and the
required length and size of each sling cable. A silhouette of the item
furnished showing the center of gravity shall be provided on the transportation
plate. Tiedown attachments may be identified by stenciling or other suitable
marking. Tiedown marking shall clearly indicate that the attachments are
intended for the tiedown of the roller on the carrier when shipped.
3.15.1 Air transportability - construction equipment. When specified (see
6.2), the roller shall meet the air transportability dimensions and weight
limits with a half tank of fuel. If necessary, dimension and weight limits may
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