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Crane Glossary
a b c d e f g h i j k l m n o p q r s t u v w x y z
MAGNETIC CONTROL:
A means of controlling direction and speed by using magnetic contactors and relays.
MAIN LINE DISCONNECT SWITCH:
A manual switch which breaks the power lines leading from the main line collectors.
MANUAL-MAGNETIC DISCONNECT SWITCH:
A power disconnecting means consisting of a magnetic contactor that can be operated by remote pushbutton and can be manually operated by a handle on the switch.
MASTER SWITCH:
A manually operated device which serves to govern the operation of contactors and auxiliary devices of an electric control.
MATCH MARKING:
Identification of non-interchangeable parts for re-assembly after shipment.
MECHANICAL LOAD BRAKE:
An automatic type of friction brake used for controlling loads in the lowering direction. This unidirectional device requires torque from the motor to lower a load but does not impose additional load on the motor when lifting a load.
MEAN EFFECTIVE LOAD:
A load used in durability calculations accounting for both maximum and minimum loads.
MILL DUTY CRANE:
Service classification covered by AISE Standard No. 6, ‘Specification for Electric Overhead Traveling Cranes for Steel Mill Services’,
MULTIPLE GIRDER CRANE:
A crane which has two or more girders for supporting the live load.
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