Sizing Gearbox for 7.5HP Motor w/1750rpm & 580rpm Input Speed

AI Thread Summary
To size a gearbox for a 7.5HP motor operating at 1750rpm with an input speed of 580rpm, it is essential to focus on the lower input speed, which results in higher torque and lower output RPM. The gearbox must be capable of handling the torque generated at this input speed while ensuring it can manage the 7.5HP effectively. Proper attention should be given to the duty cycle, lubrication, and cooling of the gearbox to prevent overheating and failure. If the gearbox becomes overloaded, it is likely that the belt will slip, indicating a need for proper fitting and possibly larger pulleys or additional belts to manage the input torque. Ultimately, selecting the right gearbox involves calculating the required torque and ensuring the system is designed to handle the expected loads.
SevenToFive
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If I have a 7.5HP motor running at 1750rpm with a pulley and v-belt and connect it to a gearbox, where the right angle worm gearbox sees an input speed of 580rpm, how would I go about sizing the gearbox?

Am I correct to say that I would size the gearbox for the lower input speed and more torque, and lower output rpm? So I would then calculate the torque generated with a 580rpm input speed, and verify that the gearing is capable of handling the increased torque.

I don't think the gearbox is going to be really seeing the 7.5HP, and if the gearbox becomes overloaded, the belt would probably slip on the pulleys connecting the motor and gearbox correct?

Just looking to confirm that I am on the correct path of thought here. Thanks to everyone who replies.
 
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SevenToFive said:
If I have a 7.5HP motor running at 1750rpm with a pulley and v-belt and connect it to a gearbox, where the right angle worm gearbox sees an input speed of 580rpm, how would I go about sizing the gearbox?
The gearbox will need to handle 7.5 HP at 580 RPM. Check the duty cycle, lubrication and cooling of the gearbox.

SevenToFive said:
Am I correct to say that I would size the gearbox for the lower input speed and more torque, and lower output rpm?
Yes, the slower the output shaft, the heavier it will need to be to handle the torque when transmitting 7.5 HP. But you know the input RPM and HP so you can base selection on input shaft torque.

SevenToFive said:
I don't think the gearbox is going to be really seeing the 7.5HP, and if the gearbox becomes overloaded, the belt would probably slip on the pulleys connecting the motor and gearbox correct?
Belts will not slip if they are correctly fitted. If they do slip they will creep during normal operation and so will wear the belts. What section belt and how many will you need for the input torque? Use bigger V-belt pulleys to reduce belt tension or number of belts.

Do you have a link to a list of worm boxes rated at 7.5 HP or more?
What reduction ratio or output RPM is your target ?
 
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Baluncore, as always thanks for your help.
 
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