Thanks all for your advice. It was all prudent. Paddingtongreen was the closest to the correct diagnoses. The problem was solved today when the fabricator removed the paint from the rails. The crane was load tested (120%) and ran straight and true, no vibration. I knew something in the...
One of my clients was modifying a bridge crane. Based on calculations, I recommended the following for each of the two bridge beams: W30x108 with a C15x33.9 channel cap welded to the top flange. The bridge span was 60'-5" fron center to center of rails. The capacity of the hoist was only 15...
Is is reasonable to assume that the dynamic (live) load component of a stamping press is equal 50% of the dead weight of the press with tooling (die)?
The owner has stated that they have used this 50% value on prior press installations.
For example,
press weight = 640 kip
die weight = 70...
