I have an overhead crane and we are having some issues with the gearboxes that drive the bridge. The total crane weight is 44250lbs and has a 4 ton capacity. The wheels are 13.5 inches in diameter and have a wheel load of 16500lbs. The gearbox is driven by a 2HP electric motor at 1750rpm. The gearbox itself is 30:1, the output speed is 233rpm and 2232in-lbs of torque.(adsbygoogle = window.adsbygoogle || []).push({});

I added the weight of the crane and capacity to give me 52250lbs, and divide it by 4 for each of the wheels of the end truck I get 13062.5lbs.

Using HP = n*T/5252 I can solve for T which should be the torque required to move the crane correct? I then have 5252*2HP/233rpm=T. This gives me a value of T=45.0015ft-lbs which is 540 in-lbs of torque. So our current gearbox has plenty of torque.

Am I on the right path? I haven't done this in awhile.

Thanks in advance.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Gearbox torque

Have something to add?

Draft saved
Draft deleted

Loading...

Similar Threads for Gearbox torque |
---|

Small question regarding a motor-compressor gearbox |

Gearbox sizing |

Static and Dynamic torque of a gearbox |

How to calculate maximum gearbox input torque |

**Physics Forums | Science Articles, Homework Help, Discussion**