Jib Crane Motor Calculation

Why not just go to the original equipment manufacturer, quote the serial number of the crane, and order a replacement to fit? This places the burden of getting it right with that party.

Thank you for your feedback. The problem is, i need to modify existing crane. At the moment we reduce the load and need to fix a new motor to rotate the arm. So i need to calculate the required power of the new motor.

How involved is the company that provides collapse indemnity insurance cover for the crane with this redesign?

How involved is the original equipment manufacturer with the redesign?

What's wrong with the existing motor? <sigh>

Actually it was fabricated in-house. not purchased through a company.

What are the answers to the questions that have been ignored?

<sigh>

Total moment of inertia = 9600 kgm²

(mass of beam = 250kg, Hanging load + Hoist weight = 600 kg)

Torque = 75 Nm

(time taken to rotate 90 degree = 20 S)

Power = 12W

This is the method i used.

What are the answers to the questions that have been ignored?

<sigh>

You mean "What's wrong with the existing motor? "

That's what i say, the existing one is more powerful. Task is to choose less power motor which suitable for 0.5 ton capacity.

The existing motor will be fine. It will just have less work to do, in the same way the existing motor turns the crane with a less-than-maximum load applied as it does at the moment.

And the insurance question, which has still been ignored?

• The proposal is to modify a piece of safety-critical equipment that is on an equipment register for insurance purposes and was in a known and registered state at the date of the last periodic insurance examination. In the event of an incident, if the Loss Adjuster in attendance can identify a change in the equipment that was not registered at the pervious insurance examination, that individual will adjust the loss, downwards, ultimately to zero, leaving the loonies that carried out the change open to civil and criminal proceedings without the protection of indemnity insurance cover. Stuff that!

<sigh>

I'm worrying about the calculation.

all other things are internally can be solved.

Still no replies for my question.

please consider my question.

See #9⇑.

<unsubscribes>

This is a homework problem that dsr123 wants to be checked ....

If this is a homework question please post it to CR4's new Engineering Homework Help blog.

Static friction will dictate the minimum stall torque.

Friction loss of your bearings supporting the jib while loaded assymetrically. Also what is the smallest motor at your system voltage that will mate to your gearbox. What are the losses or the gearbox. What is the anticipated duty cycle of the traverse, and effect on motor heating?

And further to Sir Robin note, consider breakaway torque under cold conditions, when lube can be much stiffer than expected.