- Joined
- Nov 19, 2014
- Messages
- 991
I was threading 1 1/4" - 12 today, everything was going along fine and then the tool dug in and broke. the cross feed and compound are all adjusted up snug, nothing was disconnected on the main drive and power feed. I replaced the tool and began to look for a reason and discovered that the tool was out of time. I checked the pin that couples the lead screw to the gearbox, and it was intact. All the open gears behind the end cover are tight as well. I had a similar problem a while ago cutting 3/8" - 24 left hand but I never investigated the root cause. I have cut threads at other pitches with no problems but, not lately. Since 12 tpi and 24 tpi are in the same column I'm thinking I may have a problem with a sheared key on the coresponding gear. Any ideas or trouble shooting advice will be appreciated.