eccentric: the offset portion of
the main shaft or main gear that imparts reciprocating slide motion. NOTE: The stroke length of the press is twice
the offset dimension.
eccentric gear press: a basic type of
mechanical power press wherein the reciprocating slide motion is produced by an eccentric gear(s).
Reference: crank press.
motion: the slide motion
produced when the slide connection(s) is directly driven by a crankshaft,
eccentric shaft, or eccentric gear(s). NOTE: The slide
motion diagram is symmetrical before and after bottom dead center.
eccentric shaft: a crankshaft with
crankpin of such a size that it contains or surrounds the shaft.
eccentric strap: preferred term
eccentricity: in a crank or eccentric gear press, the distance from the centerline of the
crankpin or main shaft to the centerline of the crankpin(s) or eccentric(s). NOTE: The eccentricity is equal
to one half of the stroke length.
effective draw: the maximum limits of
forming depth that can be accomplished with a multiple action press. NOTE: Effective draw as shown on a motion
diagram for a multiple action press is the distance of the inner slide from the end of its stroke, at the point
where the outer slide begins its dwell. For a triple action press as well, the effective draw of the lower slide
will be shown as the distance from the end of its stroke, at the point where the inner slide begins its dwell.
stop: the immediate or
controlled stopping of all hazardous press motion, accompanied by the removal of sources of electrical energy to
the press. NOTE: For most mechanical power presses, the red mushroom head STOP palm button does
not stop the flywheel and should not be considered an emergency stop. An emergency stop may not remove stored
pneumatic or hydraulic energy. Reference: stop control; top
control: an operator control,
usually a push button (palm button) with a large, red, protruding mushroom head, that when actuated, initiates an
emergency stop. Reference: stop control.
curve: preferred term
is usable energy curve.
the evaluation, design, or redesign of facilities,
environments, jobs, job tasks, training methods, and equipment to match the capabilities of
machine: an automatic multiple station transfer feed machine for
making drawn stampings by use of cam-driven adjustable plungers, acting from above and below the workpiece,
and to which individual tool elements are attached. NOTE: An eyelet machine does not utilize a slide or
slides, or die sets. Unlike press slides, eyelet machine plungers are individually adjustable for timing
within a machine cycle.
of slide: preferred term is slide
the process of placing the material or workpiece(s)
into the press or removing the material or workpiece(s) from the press.
blanking: the process of blanking that provides full penetration of
the metal before the blank is released from the strip or sheet. NOTE: In conventional blanking, the blank is
released after about 35% penetration, which produces a rough edge with what are
called: (a) rollover; (b) land; (c) breakout;
and (d) burr. Fine
blanking eliminates the breakout, which is about 60% of the edge, and produces a workpiece that is precision
finished except for deburring.
action: preferred term is outer
guard: a guard affixed to the
frame, bolster, or other surface in such a manner as to enclose all or part of the point of operation or other
roller plate: a bolster-like plate that becomes a fixed plate of the press bed
when converted to QDC. The plate incorporates die clamps and hydraulically operated rollers. The rollers lift to
facilitate movement of the die cart plate, and lower to position the die cart plate in the
flywheel: a wheel that rotates
constantly when the motor is energized and whose purpose is to store kinetic energy during the nonworking portion
of the press cycle, and to release energy during the working portion of the press cycle. NOTE: Most press
operations are performed in less than 25% of the cycle. Thus with a flywheel the peak horsepower requirement of the
motor is greatly reduced.
flywheel energy: preferred term
is usable flywheel energy.
press: a nongeared mechanical
power press that has the flywheel mounted directly to the crankshaft or eccentric
control: a foot operated electrical actuating control.
Reference: actuating control; pedal.
pedal: preferred term
four-piece tie rod
frame: preferred term
is tie rod frame.
press: a press with force
applied to the slide through four connections.
friction clutch: a mechanical clutch
wherein torque and energy are transmitted by the coupling of rotating and stationary members by the application of
clamping force on frictional surfaces between the members. Reference: part-revolution
clutch; positive clutch.
press: for a freestanding
power press, the face of the master operator station usually identifies the front. NOTE: The right and left sides
of the press are to the right and left of an individual facing the front of the
front-to-back shaft press: a mechanical power press
in which the main shaft and other drive shafts are positioned in a front-to-back
full-revolution clutch: a type of clutch that,
when engaged, cannot be disengaged until the press has completed a cycle. NOTE: These clutches require a full
revolution before they can be disengaged, generally by a throw-out cam arrangement that is part of the clutch
mechanism. Reference: part-revolution clutch; positive
material: the thickness of the
material being processed.
gap: preferred term
is throat depth.
press: a general
classification of presses in which the frames are made in the approximate form of a letter
of material: preferred term is gage of
press: a press whose main
crank or eccentric is connected to the driving source by one or more sets of gears.
gibs: the press components
that guide the reciprocating motion of the slide to ensure required squareness and parallelism. NOTE: Gibs are
usually provided with replaceable liners, and are usually adjustable to enable setting of proper clearance and to
compensate for wear.
guard: a barrier that prevents
entry into the point of operation or other hazard area. Reference: adjustable barrier
guard; die enclosure guard; fixed barrier guard; interlocked barrier guard.
post: the pin and bushing assembly used to maintain the alignment
of the dies. NOTE: Guideposts are usually an integral part of the die set.
rods: the press components that guide the reciprocating motion of
the slide to ensure required squareness and parallelism.
control: a hand operated mechanism used as an actuating control.
Reference: actuating control; twohand control; two hand
high energy rate
press: a forging machine that
imparts impact to the workpiece, by means of high slide velocities resulting from the sudden release of a
compressed gas against a free piston.
hit-to-hit time: preferred term
is die transition time.
device: preferred term
is restraint device.
press: a press in which the
slide reciprocates horizontally.
horn: a horizontal cantilever
block or post that acts as the die, or to which the die is fastened.
press: a gap frame press with a straight front that is equipped
with, or arranged for, a horn. NOTE: Used for framing, punching, or riveting operations on basically
cylindrical parts. Reference: adjustable bed press.
factors: one of several terms
used to describe ergonomics.
cushion: preferred term
is hydraulic die cushion.
cushion: a die cushion that
uses a hydraulic pressure system to produce the counterforce. Reference: die cushion; NC die
overload: preferred term
is overload relief device.
press: a machine tool that
transmits force hydraulically to cut, form, or assemble metal or other material by means of tools or dies attached
to and operated by slides.
hydraulic tie rod nut: a tie rod nut arranged
to pre stress the tie rod hydraulically NOTE: Not to be confused with a hydraulic
hydropneumatic cushion: preferred term
is hydropneumatic die cushion.
cushion: a die cushion that
uses a hydropneumatic pressure system to produce the counterforce.