MIL-P-80041D
The slide shall be adjustable vertically to
3.4.1.3 Slide adjustment.
change its position with relation to the bolster plate or bed, when the slide
is at the bottom of its stroke.
The amount of adjustment shall be not less
than that specified in table I.
Unless otherwise specified (see 6.2), presses
with a rated tonnage capacity of 150 tons or
less may be adjusted manually.
Presses rated at more than 150 tons shall have an electric or pneumatic motor
driven adjusting mechanisms. When specified (see 6.2), each press shall be
equipped with a slide position indicator to show the position of the slide at
all points of the stroke.
The crankshaft shall be of the size, material, and
3.4.1.4 Crankshaft.
strength required to transmit the maximum imposed torsional
loads without
permanent deformation or distortion.
The shaft shall be supported by, and
r e v o l v e i n , replaceable bearings.
Shaft bearings shall be line reamed and
finish fitted to provide a running clearance in accordance with
the
manufacturer's requirements for the size shaft furnished.
W h e n specified (see
6 . 2 ) , a shaft extension s h a l l b e p r o v i d e d a s a p o w e r s o u r c e f o r d r i v i n g
auxiliary equipment.
Each press shall be provided with a mechanism
3.4.1.5 Inclining mechanism.
which will allow the press frame to be inclined backward
(see 3.4.1). The
mechanism s h a l l b e t h e m a n u f a c t u r e r ' s s t a n d a r d d e v i c e o f f e r e d t o
the
commercial market.
If a specific inclining mechanism is required, it shall be
as specified (see 6.2).
3.4.2 Drive.
Unless otherwise specified (see 6.2), the press drive shall
be a constant fixed speed. When specified, a variable speed drive shall be
furnished.
3.4.2.1 Class 1, non-geared. The class 1 press
shall have a flywheel
drive consisting essentially of the drive motor,
crankshaft, flywheel,
V-belts, clutch and brake, and connecting components
between the crankshaft
and slide.
T h e arrangement of the drive components in
or on the crown of the
frame shall be as standard with the manufacturer.
3.4.2.2 Class 2, geared. The class 2 press shall have a single geared,
s i n g l e end d r i v e c o n s i s t i n g o f a n e l e c t r i c m o t o r , m u l t i p l e V - b e l t d r i v e ,
clutch, brake, drive shaft with a pinion driving the main drive gear on the
crankshaft, and a flywheel mounted on the drive shaft.
3.4.2.4 V-belts.
V-belts shall be furnished in matched sets in order to
provide maximum power transmission. Means shall be provided for adjusting and
replacing belts.
3.4.2.5 Flywheel.
T h e flywheel shall be balanced after machining, and have
sufficient mass and speed to supply kinetic energy required to perform any
operation w i t h i n t h e c a p a c i t y o f t h e p r e s s without
imposing
overload
conditions on the drive motor or other driving components. When specified
(see 6.2), a flywheel brake shall be provided for stopping the flywheel within
30 seconds after the drive motor power has been turned off.
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