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Torque needed to twist off a bottle cap

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airman00:
I need to know the amount of torque needed to twist off a bottle cap from a soda bottle. Can anyone guess an approximate torque? Or where I can find that out from?
Thank you,
Eric

ed1380:
securly mount a 1ft long rod to teh cap. and lay the bottle down, with teh cap  hanging off of a table, and then start adding  weights at the end of the rod.
once it twists off, you know how many ft/lb you need

Gertlex:

--- Quote from: ed1380 on August 31, 2007, 05:30:22 PM ---securly mount a 1ft long rod to teh cap. and lay the bottle down, with teh cap  hanging off of a table, and then start adding  weights at the end of the rod.
once it twists off, you know how many ft/lb you need

--- End quote ---

Account for the torque provided by the rod too, of course.

Unless you mount the center of the rod to the cap, then it cancels itself out.

ed1380:

--- Quote from: Gertlex on September 01, 2007, 07:36:58 AM ---
--- Quote from: ed1380 on August 31, 2007, 05:30:22 PM ---securly mount a 1ft long rod to teh cap. and lay the bottle down, with teh cap  hanging off of a table, and then start adding  weights at the end of the rod.
once it twists off, you know how many ft/lb you need

--- End quote ---

Account for the torque provided by the rod too, of course.

Unless you mount the center of the rod to the cap, then it cancels itself out.

--- End quote ---
yeah didn't think of that.

Admin:

--- Quote ---Account for the torque provided by the rod too, of course.
--- End quote ---
FYI, its:

torque = .5 * (weight of rod) * (length of rod) + (weight of object) * (length of rod)

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