straightening a threaded rod

[Soundguy]

i'm not refering to the fact you have a bent rod going into a straight coupler ( nut ).. i'm refering to a bent threaded rod that is going to break at the thread root once stressed more.

getting it perfectly straight is virtually impossible, thus one would expect difficulty in screwing it in / unscrewing. that why I said i never straighten threaded rod.. I only transplant or replace.

curved rod into straight hole was kindergarten stuff.. like square peg in round hole... ust don't fit..

soundguy

ps.. yes.. i do have an engineers black book.. but as said.. we are talking about 2 different problems. i'm still on the 'it's weaker now and may break again' bandwagon.. not the ' gee.. it's bent and won't screw in easilly' deal.. which was to be 100% expected by all involved.. or should have been..

 

[SPYDERLK]

:thumbsup: Yeah. Im guessing your bend was not severe? - lo straightening risk. Do you know what happened to make it bend? Im asking because if it bent from compressive force [buckling] it would be termed more a failure since this is a normal function called upon in use. If it bent from accidental side force I would call it damage. Id rather be fixing the accident, but upgrading the failure. See what I mean?

I will always use heat when straightening any non trivial threaded part that is bent enuf to impede a nut. The reason is notch strain. Virtually all bending movement takes place in the very small area at the bottoms of the threads - an extremely intense situation when you think about it. Heat eases the abuse by softening things up a bit. The harmless limit is around 600F. This is where shiny steel colors blue/purple. A straw-brown color precedes this, occuring around 400F. Any heat helps. The colder the metal the more difficult and abusive bending is. Threads/notches are just a worst case.
larry

i'm not refering to the fact you have a bent rod going into a straight coupler ( nut ).. i'm refering to a bent threaded rod that is going to break at the thread root once stressed more.

getting it perfectly straight is virtually impossible, thus one would expect difficulty in screwing it in / unscrewing. that why I said i never straighten threaded rod.. I only transplant or replace.

curved rod into straight hole was kindergarten stuff.. like square peg in round hole... ust don't fit..

soundguy

ps.. yes.. i do have an engineers black book.. but as said.. we are talking about 2 different problems. i'm still on the 'it's weaker now and may break again' bandwagon.. not the ' gee.. it's bent and won't screw in easilly' deal.. which was to be 100% expected by all involved.. or should have been..

Si'. ... This kinda stuff is absolutely critical and gets lost in the posts that dont recognize deeper relevances. That seems to be why it must be repeatedly referred to.:confused3:
larry

 

[RoyJackson]

i'm not refering to the fact you have a bent rod going into a straight coupler ( nut ).. i'm refering to a bent threaded rod that is going to break at the thread root once stressed more.

getting it perfectly straight is virtually impossible, thus one would expect difficulty in screwing it in / unscrewing. that why I said i never straighten threaded rod.. I only transplant or replace.

curved rod into straight hole was kindergarten stuff.. like square peg in round hole... ust don't fit..

soundguy

ps.. yes.. i do have an engineers black book.. but as said.. we are talking about 2 different problems. i'm still on the 'it's weaker now and may break again' bandwagon.. not the ' gee.. it's bent and won't screw in easilly' deal.. which was to be 100% expected by all involved.. or should have been..

As far as weaker...depends on how acute the bend is. If a mild bend, might not fail, but it may still bind when threading the mating part but last for quite a while. Probably a moot point though as my guess is Ducks13 will replace the adjustment link.

 

[Soundguy]

I would at least have one, or the parts on the shelf to do so. I've just had no luck straightening them.. have had 100% luck repairing them vie replacement parts.. IE.. new thread and ends / welding..e tc.

soundguy