jerry1423
Mechanical
- Aug 19, 2005
- 3,428
I have a large round cast part, with a finished weight of approx 4000 lbs.
It basically is a conical circular ring with the CG in the center.
The part is oriented in the machine (that it is a component of) the same way as it sits on the floor, so it simply gets lifted and placed into it.
For lifting I added bosses with tapped holes for three equally spaced lift hooks around the outside of the casting.
I was told by the main engineer on this project to add another lift hook so that there are four equally spaced ones instead of three.
With a part as symetrical as this one I think there may be problems, as theoretically all the weight could be balanced on two of the four slings.
I am just a peon here (temp project employee) so trying to explain something like this to him is virtually impossible; he cites that "that's the way we've always done it here".
How can I explain to this guy so that it seems like I know what I am talking about when I explain to him that three lift locations is better than four?
I am by no means an expert at this type of thing, but sometimes it's just hard explaining something that is such common sense to me.
Is there any publication out there that I can cite to support my point ?
If I am wrong at this, let me know that too. There are no issues here with sling or lift hook lift linits.
It basically is a conical circular ring with the CG in the center.
The part is oriented in the machine (that it is a component of) the same way as it sits on the floor, so it simply gets lifted and placed into it.
For lifting I added bosses with tapped holes for three equally spaced lift hooks around the outside of the casting.
I was told by the main engineer on this project to add another lift hook so that there are four equally spaced ones instead of three.
With a part as symetrical as this one I think there may be problems, as theoretically all the weight could be balanced on two of the four slings.
I am just a peon here (temp project employee) so trying to explain something like this to him is virtually impossible; he cites that "that's the way we've always done it here".
How can I explain to this guy so that it seems like I know what I am talking about when I explain to him that three lift locations is better than four?
I am by no means an expert at this type of thing, but sometimes it's just hard explaining something that is such common sense to me.
Is there any publication out there that I can cite to support my point ?
If I am wrong at this, let me know that too. There are no issues here with sling or lift hook lift linits.