Calculating number of bolts for piston cap
Calculating number of bolts for piston cap
(OP)
I am trying to figure out what size and number of bolts I need to attach a piston cap to the cylinder barrel. It's for a 250ton brake with 2 cylinders, so I figure 125 tons of pressure on each cylinder. I am using the formula for allowable stress = load/bolt tensile stress x # of bolts. Is the correct formula? And how does that get me to my amount of bolts I need?





RE: Calculating number of bolts for piston cap
If each bolt is good for 10,000 lbs then you need 13 bolts assuming half and half.
That said - I think you need to seek some professional help on this one.
RE: Calculating number of bolts for piston cap
RE: Calculating number of bolts for piston cap
The size is the thread stress area, which is found using various equations such as those found in ISO 898-1.
It sounds like you would benefit from the Guide to Design Criteria for Bolted and Riveted Joints, available here:
http://www.boltcouncil.org
Regards,
Cory
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RE: Calculating number of bolts for piston cap
RE: Calculating number of bolts for piston cap
One day the application called for a boost in hydraulic pressure.
Basic calcs said the specified torque's clamping due to preload would be exceeded with the new pressure.
Oil all over the test area confirmed the cap lifted enough to unload the o-ring. The bolts did not break.
RE: Calculating number of bolts for piston cap
Tobalcane
"If you avoid failure, you also avoid success."