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main control station: preferred term is master operator station.

manual feeding: the process whereby the operator(s) places the material or workpiece(s) into the press or removes the material or workpiece(s) from the press. Reference: automatic feeding.

manual mode: any operating mode of the press that requires the operator to initiate and maintain motion of the press during the stroke, or portion of the stroke, by use of the actuating control. Reference: automatic mode.

master operator control: preferred term is master operator station.

master operator station: the control station that includes the full complement of controls required for the setup and operation of the press. NOTE: Operator controls located at the master operator station may include, but not be limited to, the following: (a) motor controls; (b) mode selector(s); (c) slide adjustment controls; (d) inch mode actuator(s); (e) stop controls; (f) variable speed control; and (g) displays, meters, readouts.

maximum draw: preferred term is effective draw.

maximum separation: on a multiple action press, the point or position during the press cycle at which the faces of the inner and outer slides are the farthest apart.

maximum upper die weight: the total mass of the tooling and tooling attachments that can be pneumatically counterbalanced with the maximum air pressure available to the pneumatic control system. NOTE: Presses equipped with pneumatic counterbalance cylinders are required by safety standards to have a die weight chart for guidance in setting counterbalance pressure.

mechanical power press: a machine tool that transmits power mechanically to cut, form, or assemble metal or other material by means of tools or dies attached to or operated by slides. NOTE: A mechanical power press consists of a stationary bed and a slide or slides having a controlled reciprocating motion toward and away from the bed surface. The slide is guided in a definite path by the frame of the press.

micro-inch drive: a drive means to provide a slow press speed for controlled inching of the slide. NOTE: A micro-inch drive can utilize a separate motor and gear reduction that drives the brake assembly and typically runs at 1 SPM. It can also utilize an oversized main motor and flywheel, typically running at about 5 SPM. Either arrangement can be rated at full press capacity or some reduced capacity rating.

minimum safe distance: preferred term is safe distance.

minimum separation: on a multiple action press, the point or position during the press cycle at which the faces of the inner and outer slides are the closest together.

mode: the specific manner of operation of a press or press production system determined by the state or condition of the control system. Reference: mode selector.

mode selector: a control device used to establish the press operating mode. NOTE: One or more mode selectors may be used. The mode selector(s) generally includes positions for all operating modes available on a press such as OFF, (clutch control), INCH, SINGLE STROKE, or CONTINUOUS.

MOS: master operator station.

motion diagram: a graphical representation of slide motion characteristics relative to the motion of the driving member, such as the rotation of the crank. NOTE: The graphical representation may show slide position, velocity, or acceleration. For a multiple action, the motion diagram shows the relative motion and position between the slides.

movable barrier device: a safeguarding device arranged to enclose the point of operation before press motion can be initiated. NOTE: There are two types of movable barrier devices: (a) The type A device encloses the point of operation until the press ceases motion and is at its initial starting position. (b) The Type B device encloses the point of operation during the closing portion of the press cycle. A movable barrier device may be powered open and closed by mechanical, electrical, hydraulic, or pneumatic means, or opened and closed physically by the operator.

movable barrier safeguarding device: preferred term is movable barrier device.

moving bolster: a bolster arranged to move the die in and out of position on the press bed for the purpose of facilitating die changes. NOTE: May be operated manually or by power. May be integral with or mounted to a carriage. Reference: sliding bolster.

multiple action press: a press designed for deep drawing of sheet metal by means of parallel movement of an inner slide and an outer slide, with the inner slide encompassed by the outer slide. NOTE: A multiple action press may be either a double action press or a triple action press. With either, the blankholder die component is fastened to the outer slide and the punch component is fastened to the inner slide. The outer slide is usually driven by means of a toggle or cam mechanism to produce a dwell at the end of the slide stroke. A triple action press also has a third slide that operates from below the bolster. This arrangement necessitates a dwell at the end of the inner slide stroke, the use of pressure pins, and a pin plate arranged to support the pressure pins. Reference: dwell.

multiple slide press: a press with two or more single action slides, individually guided but synchronized in their actions. NOTE: An example is a three column press with one slide for first operation blanking from a coil and a second slide for the secondary operations. Reference: double action press; triple action press.

multiple point press: preferred term is two-point press; four-point press.

muting: a means of bypassing the field of a presence-sensing safeguarding device during the nonhazardous portion of the press cycle.

NC die cushion: a hydropneumatic die cushion wherein cushion pressure can be instantaneously adjusted to the counterforce required at any specific point during the working stroke of the cushion.

nitrogen cylinder: a nearly constant force gas spring that utilizes regulated nitrogen as the pressure medium. NOTE: Nitrogen cylinders are small enough to be placed within a die set. Multiple nitrogen cylinders are normally required to provide the counterforce that would otherwise be provided by press-mounted pneumatic die cushion(s). Reference: die cushion.

nongeared press: preferred term is flywheel press.

normal operation: the operating condition during which the press production system functions as intended, to produce parts.

normal separation: on a multiple action press, the slide separation measured with stroke down and adjustment up, for both the inner and outer slides. NOTE: Slide separation is measured between the slide faces.

OBI press: open back inclinable press.

OBS press: open back stationary press.

one-piece frame: a straight side press frame combining bed, crown, and uprights into a single structure.

one-point press: preferred term is single point press.

open-back inclinable press: a gap frame press with an opening at the back between the two side members of the frame. The frame is arranged to be inclined to facilitate parts removal by gravity. NOTE: The open back inclinable press is the type of press that is in most common use. Open-back inclinable presses are usually single-point presses.

open-back stationary press: a gap frame press with an opening at the back between the two side members of the frame. The frame is arranged to be permanently upright or inclined.

operator: an individual who performs production work and who controls the press. Reference: setup operator.

operator console: preferred term is control console.

operating control: preferred term is operator station.

operator control: an operator actuated push button, switch, lever, pedal, or other device that initiates, controls, or stops motion of the press.

operator control station: preferred terms are master operator station; operator station.

operator-maintained continuous mode: Continuous cycling, initiated and maintained by the operator, by means of the actuating control(s).

operator station: the complement of controls used by an operator to operate the press in production modes.

outer slide: the slide of a multiple action press to which the blankholder of a draw die is fastened. NOTE: The outer slide is usually operated by a toggle or cam mechanism to provide dwell at the closed position of its stroke, in order to grip the blank while the punch draws the metal. Reference: dwell.

overhead drive press: preferred term is top drive press.

overload relief device: a mechanism designed to relieve overloads to structural press members, the tooling, or both. NOTE: The mechanism can be mechanical (such as shear plates), hydropneumatic, or hydraulic. The device can be located in the slide, bed, bolster, connections, or tie rods.

part revolution clutch: a type of clutch that may be engaged or disengaged during the press stroke. NOTE: Most part-revolution clutches are air-engaged mechanisms. Some types of positive-engagement clutches are capable of being disengaged within the stroke of the slide.

pass line height: the distance between a reference surface and the travel path, of the material or workpiece(s), through the tooling. NOTE: Typical reference surfaces are the floor level, the press bed, and the bottom of the die.

pedal: a foot-operated mechanical actuating control. Reference: actuating control; foot control; trip; trip control.

pendant: preferred term is pendant operator control.

pendant operator control: an operator control station that is suspended from the press to facilitate movement for operator convenience.

perimeter guard: a barrier at the perimeter, or segment of the perimeter, of a press production system. NOTE: A typical use is to prevent unintended entry between individual machine components of the coil processing system, such as a blanking or progressive die line.

pin plate (1): a replaceable wear-resistant plate that fastens to the working surface of the die cushion to transfer the force of the pressure pins to the die cushions.

pin plate (2): the plate used to support the pressure pins at the lower limit of their travel. NOTE: A pin plate is used to prevent the pressure pins from coming out of the bolster. When so arranged, the pin plate can be lifted for removal of the pressure pins. A pin plate is used with moving bolsters and with the lower slide of a triple action press.

pitman: preferred term is connection.

plain press: preferred term is flywheel press.

platen: preferred term is slide.

plunger: preferred term is inner slide.

pneumatic cushion: preferred term is die cushion.

pneumatic die cushion: a die cushion that uses a pneumatic pressure system to produce the counterforce.

pneumatic power press: an air-powered or gas-powered press that blanks, shears, punches, forms, draws, or assembles metal by means of dies actuated by a slide.

POC: pendant operator control.

podium: preferred term is control console.

point: the location at which force from a connection is transmitted to the slide. Reference: single-point press; two-point press; four-point press.

point of operation: the location in the tooling where material is positioned and work is performed. NOTE: For purposes of safeguarding, a guide pin that separates from the bushing, as the die opens, is considered part of the die’s point of operation.

positive clutch: a mechanical clutch wherein torque and energy are transmitted by the coupling of rotating and stationary members through mechanical interlocking engagement between the members. NOTE: Positive-type clutches are almost always full-revolution types. They employ a tripping device that releases spring pressure to move engaging members. Reference: friction clutch; full-revolution clutch.

powdered metal press: a machine tool that transmits force for compressing metallic or nonmetallic powders. NOTE: Force may be transmitted hydraulically or mechanically.

power takeoff: an extension of the crankshaft, or the live pin of an eccentric gear press, provided for the purpose of driving a press-mounted feed or other auxiliary equipment.

presence-sensing device: a device that creates a sensing field, area, or plane to detect the presence of an individual or object. Reference: presence-sensing safeguarding device.

presence-sensing device control: a presence-sensing device used as an actuating control.

presence-sensing device initiation: an automatic mode wherein the presence sensing device initiates a single cycle upon sensing, by the removal of all the body parts of operator(s) from the sensing field, that the work motions of the operator(s) have been completed.

presence-sensing safeguarding device: a presence-sensing device used as a safeguarding device. Reference: presence-sensing device.

press: for the purpose of this glossary, the general term for any power press. Reference: hydraulic power press, mechanical power press, pneumatic power press.

press capability curve: preferred term is press capacity curve.

press capability graph: preferred term is press capacity curve.

press capacity: preferred term is rated capacity.

press capacity curve: a graphical representation that combines the energy and tonnage curves of a press.

press capacity graph: preferred term is press capacity curve.

press production system: the press(es), tooling, methods of feeding, auxiliary equipment, and safeguarding set up for production. NOTE: Parts or scrap removal methods (or equipment) are usually classified as a part of feeding.

press rating: preferred term is rated capacity.

press shutheight: the distance from the bed surface to the slide face, with the slide in its closed position and the slide adjustment up (SDAU). NOTE: On moving bolster presses, the press shutheight is measured from the die mounting surface of the bolster, when it is integral with the carriage, or from the carriage, when the bolster is separate. Reference: die shutheight.

press stop control: preferred term is stop control.

pressure curve: preferred term is torque curve.

pressure pad: preferred term is die cushion.

pressure pin: a steel rod used to transfer die cushion force through the die to the stamping. NOTE: Also used in triple action presses to transfer the force of the lower slide through the die to the stamping.

programmable limit switch: an electronic device, used in conjunction with a linear or angular transducer, to provide independent output circuits that can be closed and opened at selected positions during the press cycle.

progressive die: a die with two or more stations arranged in line for performing two or more operations on a part, one operation usually being performed at each station. NOTE: Material in the form of coil strip is usually fed to progressive dies automatically, utilizing the strip as the carrier of the parts.

progressive die press: a specialized press designed for use with progressive dies and an automatic feed. NOTE: The press is designed with added frame and slide rigidity and with variable speed capability.

PSDI: presence sensing device initiation.

pullback device: a safeguarding device with attachments for the operator’s hands and wrists and connected to the press slide that, when properly adjusted, prevents the operator from reaching into the point of operation, or withdraws the operator’s hands from the point of operation during the hazardous portion of the press cycle.

pullback safeguarding device: preferred term is pullback device.

pullout device: preferred term is pullback device.

pullout safeguarding device: preferred term is pullback device.

punch: the male part of the die.

punch press: preferred term is mechanical power press.

punchholder slide: preferred term is inner slide.

push-type cylinder: a counterbalance cylinder installed below the slide. NOTE: Use of a push-type cylinder increases the effective piston area and eliminates the need for piston rod packing.

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