A 3-inch hydraulic rod has a 7/8-9 screw broken off about 1/2 inch inside !
The screw is some really hardened tool steel.
They managed to grind a slot in the end of the screw with a die grinder, but our little impact driver was not able to budge it.
BTW, the screw was hard bottomed out with about a 24-inch wrench (hard enough to break it, but it was probably fatigued from thousands of press cycles).
Worse, they had a mild steel spacer inside that they bottomed out on so its probably really gummed on.
While grinding the slot, they may have nicked into the rod, causing an interlocking burr.
They suggested welding to the end of the screw, but I'm afraid to weld it to the inside of the rod, or spatter the remaining screw threads beyond extraction.
We don't want to torch the rod, which would spoil the cylinder packing. I suggested dry ice or liquid nitrogen, but it is facing downward and would be difficult to apply.
I'm willing to try it if I can figure out how to spray LN2 up in there.
Absolute last resort would be, pull the cylinder and saw off an inch of the rod.
There is only about a foot of space in the throat of the press to work on this!
Right now I'm going to the auto parts store for a bigger impact driver!
The screw is some really hardened tool steel.
They managed to grind a slot in the end of the screw with a die grinder, but our little impact driver was not able to budge it.
BTW, the screw was hard bottomed out with about a 24-inch wrench (hard enough to break it, but it was probably fatigued from thousands of press cycles).
Worse, they had a mild steel spacer inside that they bottomed out on so its probably really gummed on.
While grinding the slot, they may have nicked into the rod, causing an interlocking burr.
They suggested welding to the end of the screw, but I'm afraid to weld it to the inside of the rod, or spatter the remaining screw threads beyond extraction.
We don't want to torch the rod, which would spoil the cylinder packing. I suggested dry ice or liquid nitrogen, but it is facing downward and would be difficult to apply.
I'm willing to try it if I can figure out how to spray LN2 up in there.
Absolute last resort would be, pull the cylinder and saw off an inch of the rod.
There is only about a foot of space in the throat of the press to work on this!
Right now I'm going to the auto parts store for a bigger impact driver!