Loading of Shouldered Machinery Eyebolts

[GenericDrafter]

Does the stress exerted on a shouldered machinery eyebolt increase or decrease when loaded beyond 90° relative to the shank?

In the attachment, figure 'A' is the scenario I'm concerned about. Figure 'B' is something I've seen addressed in vendor literature (e.g. Crosby recommends a working load of no greater than 25% of the eyebolt's in-line capacity).

 

[precast78]

I would not use an eyebolt. I would use something like this to reduce the moment arm from bending.

http://www.mcmaster.com/#2994t63/=tv7i2m

 

[desertfox]

Hi

When the eye is mounted vertical then the angle of the sling when from the vertical position should be no less than 45 degrees. As the angle changes below 45 degrees the force on the lifting eye increases.

see link

http://www.oshc.org.hk/others/bookshelf/cb952e.pdf

I think your correct about both the arrangements you've posted, if it were me I would try and put those lifting eyes at 90 degrees to the way you have them now.

 

[precast78]

Also, you should be concern with both scenarios. Eye bolt should only be used for pure tension.

 

[GenericDrafter]

First, thank you for your responses thus far.

desertfox:
I had actually found that exact same OSHC document; a very user friendly document!

precast78:
I'd like to move to hoist rings, but they are incredibly expensive relatively speaking which will be a tough sell.
I'm sure they're a heck of a lot cheaper than a lawsuit, however.

 

[TehMightyEngineer]

Don't forget prying forces.

Maine EIT, Civil/Structural.

 

[Tmoose]

what size are the tapped holes that will receive the eye-bolts?
How much is being lifter (pounds)?

 

[GenericDrafter]

I spoke with a lifting eye manufacturer on this topic.

They strongly discouraging the practice, but suggested that the de-rated working load at 90° could be used for moving beyond 90° as shown in 'Figure A' of the original post's attachment.

The manufacturer nor I do not want to encourage the practice for obvious reasons, but wanted to follow up as a courtesy to those who took the time to provide input.

 

[desertfox]

Hi Generic

Thanks for letting us know the outcome.