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cptxguys
"Here's the SAE specifications for the bolts -
Bolt Tensile Strength (Breaking Strength -lbs)
Bolt Dia. (in) Grade 2 Grade 5 Grade 8 (coarse thread)
1/4 2350 3800 4750"
Very interesting, that is some load on that shaft! Those bolts are failing in a shear plane. Usually shear strength is about 75% of the tensile strength and even that is a heavy load on that shaft. Wonder what the weight of the slide is? I'm assuming those slides are on some support system, perhaps rollers, and therefore rolling load should be no more than about 10% of the static weight of the slide.
Perhaps there is something binding the drive mechanism? My curiosity has really peaked now???
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