how do I calculate positions for lifting eyes in assemblies?
thanks in advance,
You want the point where your slings meet to be above the center of mass. Put in the center of mass as Kelvin suggested. In a sketch, add a vertical line through the center of mass. Place one lifting eye. Draw a line from the lifting eye to a point on the vertical line and dimension it with the sling length. This sets the center lifting point. Draw another line from the center lifting point towards the lifting point whose position you want to define. Make its length equal to the other sling line. Set the vertical height of the free end at the proper height for your lifting eye and you have defined your other lifting point.
This assumes that the two lifting points on either side of the center of mass are at the same level. If your boat is not symmetrical from side to side I think you will have to use a 3D sketch.
Use the Tools > Mass Properties tool with the Create Center of Mass Feature option, and then place the Lifting Eye directly above.
but.... what about 3 or 4?
You mean 3 or 4 lifting eyes on one assy?
Are are you lifting by a sling or chain connected to all the eyes?
Is that sling or plate being lifted at a single point?
4 point sling and shackle, a boat for example, the deck can have different shapes and levels on the same vessel.... sometimes need to shorten 2 slings to correct balance. I would like to use 4 slings with the same lenght just adjusting the lifting point...
Hi Jerry, I was thinking same way, it will be close enough, if I have different levels will have to shorten the slings... thanks for the tips.
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