We bought a 3 ton arbor press at my company and it arrived with the front half broken off. The company sent us a new one and UPS never came to pick up the old press so I spent $19 in parts and 2 hours of labor to have a new press in my garage!
The bolts are 1/2" grade 5 with the shoulders ending just before they penetrate all 3 parts. The mild steel plates are 1.5" x 0.25" x 8" scraps. The holes were drilled through the mild steel plates then they were clamped onto the press and the holes were drilled to a very close fit. They were tightened to about 30 ft lbs and should take about 10000 lbs of force each to break. Assuming the force is divided into 4 bolts (worst case) then the factor of safety is around 6.8.
The bolts are 1/2" grade 5 with the shoulders ending just before they penetrate all 3 parts. The mild steel plates are 1.5" x 0.25" x 8" scraps. The holes were drilled through the mild steel plates then they were clamped onto the press and the holes were drilled to a very close fit. They were tightened to about 30 ft lbs and should take about 10000 lbs of force each to break. Assuming the force is divided into 4 bolts (worst case) then the factor of safety is around 6.8.
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