Thanks for your time, it’s greatly appreciated.
First, I’m no engineer! I’ve just played with mechanical things for several years, mainly repairs following workshop repair manuals.
I need to move a cast iron machine that weighs approximately 700 lbs. It has a hollow cast(sand)-iron column with two 22mm lifting holes opposite one another. I plan to insert a 22mm round bar into the holes to safely lift the unit using collars with set screws to stop a lifting sling (1 ton capacity) from sliding off the bar. I also planed on using collars to keep the bar centered in the machine. My concerns are bending which would load up the collars, potentially causing them to slide off and cause the machine to drop, I also don’t want to have the bar permanently fixed in the machine or the casting to be damaged due to potential bending.
I’m looking at a 22mm diameter 304 coldworked Rockwell B80 stainless steel bar that’s 1 foot long to do the job. It’s a bit expensive for my budget, but I’ll buy it if necessary. Of course the main concern is that what ever material I use that it doesn’t bend under the weight. I thought about using standard threaded rod that can be bought at any big box hardware store, that’s just under 22mm, but I’m afraid they might be too soft and may bend, also worried about threads not making enough contact with the cast iron holes which are not perfectly cylindrical (slightly tapered or irregular). The squarish column is 7.25″ wide and the holes bearing surface (depth) is approx .450″. I would be lifting at the ends of the 1 foot rod due to thinner, potentially more fragile, protrusions above the hoisting holes. So the distance between the beginning of the two fulcrums (bearing surfaces) is approx 6.35″ which ends .450″ later and the bar extends beyond them on each side by about 2.375″.
I have no idea how to do the math, and don’t know where I can find material strengths either tensile, shear, etc to plug into the equations necessary to find my answers. So any information that can help me would be greatly appreciated. I’m not sure if I’ve provided all you may need to know, so just ask if you want to help.
Again thanks for your time!