RSJ Strength/Deflection/Point Loading

[steviec_lj]

Errrr yeah. Not quite sure on the title to be honest, but hey....

Looking at building two "gantry cranes" for personal use at home.

Unfortunately, for these, I'm actually going to have to purchase the steel as I've used up almost all of the stuff I've acquired over the years from previous jobs and projects.

Have two RSJ mountable chain blocks, capable of 1 ton loading, so would like to be able to lift the full capacity of these on the gantry cranes, so a bit of over specification wouldn't go a miss to be honest.

Looking at either;
152x89x16kg UB or
178x102x19kg UB

Now, to be honest the 152x89 would be better, as I'd lose less head room, but deflection is something I'll need to take in to account.

Would anyone be able to point me in the direction of Pointload calculations, or a table that contains this information?

 

[J.B. Welding]

How wide is the gantry, ie how long is the beam?

 

[steviec_lj]

Arrrr, knew I'd forget that vital bit of information.

Max. width between uprights would be 2.5m.
Point loading, for arguments sake in the centre of the beam.

 

[J.B. Welding]

Total deflection should only be a couple of mm (well, 1.7) using 152UB, with this type of gantry the real danger is side shifting, so put plenty of triangular bracing gussetry in the corners to brace her up and it should be fine.
For comparison I have a 1.4m wide rolling gantry with a 40x40x3 box section 'beam' which comfortably raises half a ton. Hope that helps.

Just found this courtesy of Google http://sunsetpatios.com.au/beam-deflection-calculator.php

 

[steviec_lj]

Excellent, thank you.

Thanks for the link too, bookmarked!

 

[dan.taylor.1]

What's the crack with loler testing stuff like this? Or does home use make it exempt?

 

[steviec_lj]

Do the Regulations apply to me?
If you are an employer or self-employed person providing lifting equipment for use
at work, or you have control of the use of lifting equipment, then the Regulations
will apply to you. They
do not
apply if you provide equipment to be
used primarily
by members of the public
, for example lifts in a shopping centre. However, such
circumstances are covered by the Health and Safety at Work etc Act 1974 (HSW Act).
While your employees
do not
have specific duties under LOLER, they do have
general duties under the HSW Act and the Management of Health and Safety at
Work Regulations 1999 (the Management Regulations), for example to take
reasonable care of themselves and others who may be affected by their actions
and to co-operate with others.
The Regulations cover workplaces where the HSW Act applies – this includes
factories, offshore installations, agricultural premises, offices, shops, hospitals,
hotels, places of entertainment etc.[/quote

Direct from here >>> http://www.hse.gov.uk/pubns/indg290.pdf

 

[Rig Pig]

What's the crack with loler testing stuff like this? Or does home use make it exempt?

Home use is exempt, however if you make something that fails and hurts somone you won't half get sued!