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This is an old problem now fixed, but i wondered if anyone has another idea how to get it out.
Bike shop saturday lad fits over length square tapered spindle in bottom bracket of road bike, he over tightens the external cup,trying to get it flush with the outside of the frame and forces the spindle through the fixed end of the the other cup, leaving just the inside of the cup in situ ,nothing there to get a grip on, expensive frame so cant be thrown away, or heated to try and remove the fixed cup was inserted tightly with a spanner.
How to remove a hardened steel ring inserted tigtly into the bottom bracket shell, which is just sligtly below the outer edge of the bottom bracket shell, without damaging the customers frame.
Get a reverse tap, tap the thread and wind an opposite side cup into to wind it out.
Weld something on to it, cut a slot in it, drift it round. wedge something into it
Plenty of ways to remove it
Yep grind 4 grooves with dremel or die grinder then try and get square peg (steel billet section) fitted in vice to fit in the grooved ring
Btw what's a reverse tap?? And trying to tap hardened steel with a HSS tap in very difficult.
Weld a piece of metal into the fixed cup and use a vice to get it out? Other option might be a line of weld on the cup surface, so when the weld cools it contracts and allows you to break the cup?
May need pics to help properly!
Cut two slots in the outer side of the remains of the cup, opposite each other. They don't have to be all the way along, just as deep as possible on the outside edge, at about 30 degrees to the shell. Put a cone spanner tightly in the vice, with just enough showing so you can place the frame on it so that the outside of the cone spanner fits snugly into the slots either side. get one person to hold the frame down on the spanner, and another to turn the frame.. Easy!
The answer was weld a bar into the inside of the cup.
It took the shop a week , before i suggested that, and it worked, much to their relief.
and the moral is - don't get the Saturday boy to do jobs beyond his competence without supervision...