Bike shop says can't repair bottom bracket

[Bendbiker]

I have a steel bike. It has developed a grinding sound in the bottom bracket. I took it to our local shop and they replaced the bottom bracket but the fix didn't work. They say I need a new bike. I'm baffled. If this were the case - I needs a new bike - it would mean a problem with the frame. There aren't any cracks in the bottom bracket shell. What else could make this happen?

[DaveM]

Maybe the threads in the bottom bracket shell of the frame are stripped out.<br />
I've seen people JB Weld or otherwise glue BBs into frames where the threads are severely damaged to get a little more life out of the bike. It's not great, but might hold up for a little while. Probably no shop will want to do this for you though.