Calculating Loads, High

calculating load limits when the s 279 machinery I bolt is straightforward using two slings in a true inline load each side will see half the total weight from the Crosbie lifting guide notice that for a 90 degree horizontal sling angle the load angle factor is 1 in this example the total load is 5,000 pounds which is divided by 2 for each sling leg and then multiplying by the load factor which is 1 the result is that each side lifts 2,500 pounds to select the proper bolt refer to the Crosbie lifting guide note that the panel does not mention the s 279 because the information is the same for all Crosbie shoulder eyebolts we need to select an eyebolt whose working load limit exceeds the required load of 2500 pounds which in this case is a 1/2 inch machinery eyeballed with an in-line working load limit of 2600 pounds let's now look at how increasing the horizontal angle affects the size fitting required for 60 degrees the load angle factor is 1.15 5 again we divide the load of 5000 pounds by 2 and then multiply by the load factor to determine the load each sling leg we'll see in this case each sling is loaded to 2880 7.5 pounds we will round the calculated load to 2888 pounds referring to the lifting guide you will notice four columns showing the rated capacity of Crosby's shoulder eyebolts at various horizontal angles Crosby's shoulder eye bolts have a catalog rating based on inline loading as side loading occurs on the eye bolts they must be down rated the smaller the horizontal angle the greater the reduction in the working load limit as an example let's look at the quarter inch size at 90 degrees for inline the rating is 650 pounds as the horizontal angle changes so does the resulting working load limit of the eye bolt at 60 degrees the rating is 420 pounds at 45 degrees the rating is 195 pounds and at horizontal angles less than 45 degrees the working load limit has been reduced to 160 pounds

Channel: Crosby

Views: 209,168

Keywords: crosby, crosbygroup, calculating loads, rigging, lifting, rigging tips, rigging techniques

Id: ozzifR0Uh64

Length: 2min 31sec (151 seconds)

Published: Fri Apr 11 2014