Mechanical Definitions |
Ladder Drilling : It is an arrangement of retractable
drills having pneumatic powered legs mounted on banks of steel
ladders connected to a holding frame. It is used in large-scale
rock tunneling. The advantage is, drills can be worked at the
same time by a small labor force. |
Ladder Trencher : It is a machine which digs trenches
by a bucket-ladder excavator. It can be termed as ladder ditcher.
|
Lance Door : The door to a boiler furnace is called Lance
Door by which a hand lance is inserted. |
Latent Load : The process of cooling which is required
in order to remove unwanted moisture from an air-conditioned
space. |
Lathe : It is a machine used for shaping a workpiece
by gripping it in a holding device and rotating it under power
against a suitable cutting tool. It is used to perform various
operations such as turning, boring, facing, or threading. |
Leading Truck : It is a swiveling frame with wheels under
the front end of a locomotive. In other words, the leading truck
of a steam locomotive is an unpowered wheel or axle located
in front of the driving wheels. It is used to help the locomotive
negotiate curves and to support the front portion of the boiler.
Locomotives without leading trucks are generally considered
as unsuitable for high speed use. |
Lead Screw : It is a threaded shaft which is used to
convert rotation to longitudinal motion. In a lathe it is used
to move the tool carriage when cutting threads. In a disk recorder
it is used to guide the cutter at a desired rate across the
surface of an ungrooved disk. The mechanical advantage of a
leadscrew is determined by the screw pitch or lead. |
Lean Mixture : It is a fuel-air mixture which contains
a low percentage of fuel and a high percentage of air, as compared
with a normal or rich mixture. It is also called lean fuel mixture.
|
Level Valve : It is a valve operated by a lever which
travels by a maximum arc of 180°. |
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