I'm looking for a ball park, back of the envelope, best guesstimate for this situation.. :)3/4 cube of white Delrin with a 1/4 -20 threaded hole down the middle, thru which is screwed a long 1/4-20 stainless piece of all thread. (total thread contact is 3/4")
The question is how much weight will it take to shear the threads out of the Delrin from a static load?
For instance, assume Delrin block is secured so it cant move. How much force along the threaded rod (which isn't turning) would it take to "Press" or "Pull" the threads out of the Delrin?
For reference this is NOT a life threatening situation in the event of thread failure, I'd just be pissed off ;)
The Delrin block is being used as part of a fine altitude adjustment for an aluminum structure.
The only time there could be any 'real' stress on this part is during the time of picking it up out of my truck and putting it on the ground, where the Delrin threads may have to support 100 pounds or so, probably less...
Take Care, James Lerch(My telescope construction, Testing, and Coating site)
Press on: nothing in the world can take the place of perseverance. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. Calvin Coolidge