12-30-2019, 12:08 PM
It sounds like you didn't actually remove and disassemble the reverse gear assembly from the lathe, so all I can offer is this. It seems to be either a key or the pin has sheared off in your gear set. The fact that the lead screw started turning at all was a result of friction between two parts instead of being solidly connected via the key or the pin. I am assuming that key is an integral part of the inside of the collar and not a separate piece, as in molded in to the collar itself. (Zamak?)
Questions:
Are the dogs of collar fully engaging into each end of the drive gears? (Power is transmitted to the lead screw through different paths depending on the direction.)
With the lathe running and the lead screw is 'stalled' can you see if the drive gear (9-48B) is turning or not?
If you remove the collar (completely) can you see a fully formed key sticking out inside the bore?
It's actually a pretty simple mechanism, but you are going to have to take apart in order to fix it anyway. Like 'Nike' says... Just Do It!
Questions:
Are the dogs of collar fully engaging into each end of the drive gears? (Power is transmitted to the lead screw through different paths depending on the direction.)
With the lathe running and the lead screw is 'stalled' can you see if the drive gear (9-48B) is turning or not?
If you remove the collar (completely) can you see a fully formed key sticking out inside the bore?
It's actually a pretty simple mechanism, but you are going to have to take apart in order to fix it anyway. Like 'Nike' says... Just Do It!
Willie