In a multidaylight press, a platen that is between the main head and the press table and can be moved independently of them.


Related Terms

PILE CAP

A mass of reinforced concrete cast around the head of a group of piles to ensure that they act as a unit to support the imposed load.

PICKHAMMER

[DESENG] Ahammerwithapoint at one end of the head and a blunt surface at the other end.

PHILLIPS SCREW

A screw having in its head a recess in the shape of a cross; it is inserted or removed with a Phillips screwdriver that automatically centers itself in the screw.

PEEN

The end of a hammer head with a hemispherical, wedge, or other shape; used to bend, indent, or cut.

PAN BOLT

A bolt with a head resembling an upside-down pan.

OPENING DIE

A die head for cutting screws that opens automatically to release the cut thread.

OFF-LINE

1. A condition existing when the drive rod of the drill swivel head is not centered and parallel with the borehole being drilled. 2. A borehole that has deviated from its intended course. 3. A condition existing wherein any linear excavation (shaft, drift, borehole) deviates from a previously determined or intended survey line or course. 4. State in which an equipment or subsystem is in standby, maintenance, or mode of operation other than online.

MASK

1. A frame used in front of a television picture tube to conceal the rounded edges of the screen. 2. A thin sheet of metal or other material containing an open pattern, used to shield selected portions of a semiconductor or other surface during a deposition process. 3. A protective covering for the face or head in the form of a wire screen, a metal shield, or a respirator.

MACHINESCREW

[DESENG] Ablunt-endedscrew with a standardized thread and a head that may be flat, round, fillister, or oval, and may be slotted, or constructed for wrenching; used to fasten machine parts together.

MACHINE BOLT

A heavy-weight bolt with a square, hexagonal, or flat head used in the automotive, aircraft, and machinery fields.

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