Problem with post vise

[Mike Turner]

Hi all I just picked up a Iron City 6" post vise cheap. The problem with it is the screw is stuck in the nut and it appears to be cross threaded or something. I think it maybe cross threaded as it has pulled a burr off the front of the nut. The vise it self is in great shape jaws are very clean. Any suggestions? I will try and get a picture up tomorrow.

[Dan OHare]

Changed the oil in your car lately?
Put old contents from block in bucket.
Let simmer, head down in bucket.
Come back later and slowly work...Dan

[Mike Turner]

Dan it is not rusty, I think someone way over tightened this vise as the handle is bent real bad which you will see when I can get some pics up.

[Thomas Dean]

I think this is the problem. I doubt that it is cross threaded, more like a pulled thread from over tightening...hence the bent handle. I would try to soak it in warm oil like Dan OHare suggested...what have ya got to 'loose'? (intended) Good luck.

[steve sells]

I admit that not having seen the vise its hard to guess,

BUT have you really looked at the monster threads on a post vise? King Kong would have trouble cross threading one of those. try the warm oil.

[hdwarner]

try putting tension on the handle while tapping with a brass hammer on the front
of vise handle where cross bar is go back and forth with your tension ,
simulate an impact hammer ,
if in fact it is cross threaded evetually there will be movement and it should probally break loose

[jayco]

Mike, if it doesn't look cross threaded, I might suspect that some foreign object (a sliver of steel) perhaps has gotten stuck to the greasy screw threads and accidentaly got mashed between the threads of the nut & screw.

I've had this happen several times with ordinary bolts and nuts.

If this is the case, it would still be hard to get loose, but the threads might not be ruined after all.

Also, the handle could have been bent by some one else trying to free it up.

Good Luck!

[Ten Hammers]

Juniors trick with Marvel Mystery Oil works. Heat a bit, put some MMO in the part. Heat again till the oil sizzles a bit ( might add another pinch of oil) and come back tomorrow. I keep it in a standard gravity thumb oil can for air tool oil and other uses.

[Daryl]

I seriously doubt the threads being cross-threaded. If the threads are straight-cut or Acme threads, someone able to cross-thread such would be a miracle worker. I suspect the threads may be worn and then subject to over-tightening. You have probably three options: 1. Find another screw and box set (most don't work well mis-matched), 2. Weld up another set from Acme screw stock and nut (the most efficient good, reliable method), 3. I believe somewhere on this website there is an outline of the old method of brazing new threads in the box-end using older methods (never tried that myself).

[Dragons lair]

Mike check ebay #220190704838 screw and box