MIL-P-80026C
All gears of the ram and drive train shall be designed and
3.3.7 Gears.
meet or
manufactured of a suitable ferrous material to
exceed the
requirements of AGMA 360.02 and 390.03 for the inch-pound system or IS0 54 for
the metric (SI) system. The gears shall be of proper width and size to
transmit full-rated torque and horsepower throughout the speed ranges without
failure for the expected service life of the machine. Gears in the drive
train shall be hardened steel, Working surface hardness shall be not less
than Rockwell C-48.
3.3.8 Electromagnetic interference control. When specified (see 6.2.1),
equipment furnished under this specification shall comply with MIL-STD-461.
The equipment and subsystems class and the emission and susceptibility
requirement shall be as specified.
3.4.1 Frame. The frame structure shall be either cast iron, cast steel, or
a fabricated steel weldment of the mass, weight, and rigidty to withstand
stresses produced when operating the machine at its maximum capacity without
permanent deformation or
failure.
style
The frame shall be of "C"
configuration, stress relieved, with the overhang column and base forming a
workpiece opening or throat. The depth of the throat shall be as specified
for the machine sizes listed in Table I. The frame enclosure shall have
covered access openings of the size required to facilitate servicing,
maintenance, and adjustments of all components contained therein. The frame
shall be a floor mounting unit, arranged to support the punching ram at a
working height of not less than 36 inches, and not more than 42 inches from
the mounting surface. The base of the frame shall have means to permit
leveling and fastening the machine to the floor or foundation. When specified
(see 6.2.1), vibration dampening leveling pads shall be provided. An eye or
attachment point shall be provided at or near its balance point on the frame
for lifting the machine. The eye or lift point shall be capable of supporting
twice the weight of the machine, and its location shall not cause distortion
to the frame when the machine is suspended,
The upper and lower turrets shall be mounted on bearing
3.4.2 Turrets.
surfaces between the overhang and base of the "C" type frame. The turrets
shall be synchronized to rotate as a single unit with the punches of the upper
turret constantly aligned with the corresponding dies of the lower turret.
Unless otherwise specified (see 6.2.1), turret rotation shall be driven by a
hydraulic or electric motor gear drive system.
The machine shall be provided
with indexing pins for aligning and locking the turrets into punching position
under the punch ram. The mating holes of the indexing pins shall be provided
with bushing inserts, The machine shall be provided with means for preventing
the ram from being actuated while the turrets are not locked in the punching
position.
3.4.2.1 Punch holders. Each punch station of the upper turret shall be
provided with a punch holder. The punch holders shall be constructed of
steel, and be arranged to securely hold the punch in position. The punch
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