Crane Duty Helical Equipment Boxes
SELECTION PROCEDURE
Satisfactory performance of the crane duty helical gearbox gearbox depends upon correct selection. The selection of a gear unit is definitely influenced by the class of duty of the crane that ought to be determined and specific. Single, Dual and Triple stage Horizontal equipment systems type HA, HB and HC are suggested for Hoist and Long Travel drive. Three stage vertical equipment products type VC are recommended for cross travel drives of the EOT crane. Assembly arrangement should be specified while purchasing the gear units.
1. Compute the required reduction ratio.
2. Determine the horsepower required for the prime mover.
3. Make reference to the rating desk, find in the ratio column and based on input rpm examine the gear box ranking horizontally for various class of duty of the crane.
4. The size ought to be selected in a way that the rated HP is equal or more than the consumed HP.
EXAMPLE
1. Select a unit to transmit 9 HP from 720 rpm electric electric motor for hoist drive in a class II duty crane, the decrease ratio required is 31.50.
· 
For hoist drive a two stage horizontal gearbox type HB will become suitable.
· Start to see the ratio column and in the size HB-350, for insight rpm of 720 in class II duty the rated HP is 9.5
· Since the consumed HP is definitely 9, the machine HB-350 will be suitable.
2. Decide on a unit to transmit 3 HP from 960 rpm electric electric motor for cross travel drive in a course IV duty crane, the decrease ratio required is 14.26.
· For cross travel drive, a vertical gearbox type VC will become suitable.
· Start to see the ratio column and in the size VC – 32Q, for input rpm of 960 in course IV duty the rated HP is 3