rabler
Cast Iron
- Joined
- May 25, 2020
- Location
- Rural S.W. Indiana
My 612 is working electronically. Main motor, hydraulic pump, and rapid traverse all rewired to 220V and turning. Spindle speed shifting works well. But ...
My "tumbler lever" on the side of the QCGB on my 612 isn't engaging, so neither the feed rod or threading leadscrew are not turning. This is the lever on the right side of QCGB that is suppose to be flipped down before changing any of the feed gears, and then back up to engage the QCGB after a gear change.
I took the cover off the QCGB and while the spindle was under power in a very low gear and the end gears are turning. Nothing inside the QCGB is moving. Nor do any of the levers that select range A-B or C-D-E shift as if under rotation.
I have the parts diagrams from vintagemachinery.org. The tumbler lever turns a small gear at the end of a shaft. But I can't figure out what that gear engages with. I would guess something on the tumbler gears but thats a guess.
Anyone familiar with this gearbox? I'm asking on the off chance someone has run into this and has a quick suggestion. Likely pulling the QCGB off is in my future, but I may try pulling the faceplate off first. Like everything else on this lathe, the gearbox appears to be a real beast.
My "tumbler lever" on the side of the QCGB on my 612 isn't engaging, so neither the feed rod or threading leadscrew are not turning. This is the lever on the right side of QCGB that is suppose to be flipped down before changing any of the feed gears, and then back up to engage the QCGB after a gear change.
I took the cover off the QCGB and while the spindle was under power in a very low gear and the end gears are turning. Nothing inside the QCGB is moving. Nor do any of the levers that select range A-B or C-D-E shift as if under rotation.
I have the parts diagrams from vintagemachinery.org. The tumbler lever turns a small gear at the end of a shaft. But I can't figure out what that gear engages with. I would guess something on the tumbler gears but thats a guess.
Anyone familiar with this gearbox? I'm asking on the off chance someone has run into this and has a quick suggestion. Likely pulling the QCGB off is in my future, but I may try pulling the faceplate off first. Like everything else on this lathe, the gearbox appears to be a real beast.