Machines Flashcards
Brake coil
-2 wires per coil
-temporary magnet that pulls the plunger inward when charged, opening the brakes
Brake monitoring switches
-every machine has at least one pair that tells the controller the breaks are opened (picked)
-some machines have another pair that tells the controller the brake pads are low
2 types of brakes
-Disc
-Drum
What does a DC motor have
-commutator
-brushes
What does an AC motor have
-stater
-rotar
-fan
Titan worm gear traction machine
-brake pedestal attached
-hanging hoist motor
-slotted traction sheave
-split coupling break drum
Hollister Whitney worm gear traction machine
-hoist motor attached to bed plate
-solid brake drum or disc
-has motor flange
-doesn’t have slots on traction sheave
-removable brake pedestal
Thrust bearing
-prevents lateral movement of the worm
-bad thrust bearing can be recognized by the break drum/disc being out of position
Thrust bonnet cap
Covers thrust bearing
Vertical brake coil has ____ plunger(s)
One
How are the brakes applied/released
-mechanically applied
-electrically released
How are the brakes applied
Spring tension pushes brake arms closed
How are the brakes released
The coil(s) is charged, magnetizing it, it pulls the plunger inward, releasing the break pads
When would you need a brake weight test
-whenever brake pads are changed
-whenever spring tension is altered
