10-22-2013, 04:25 PM
John,
Nothing I can see is slipping, but obviously something has to be and if it is, it's doing it very precisely and consistently. I'll investigate that some more.
Chuck,
All lathes have some backlash but it would be taken up once the tool starts moving towards the headstock.
Willie,
The change gears are correct, otherwise I wouldn't be getting the correct TPI. I did triple check them though. My lathe does not have separate gears for imperial and metric. You swap places of two large gears to change from imperial to metric and I did check those. I also checked the threading dial gear, that's one of the first things I suspected.
I did try cutting the threads with the half nuts engaged at all times and it did cut the thread correctly, but I already knew it would. So I'm still perplexed as to what is going on. I think I'll sleep on it and maybe I'll have an answer come in a dream.
Ed
Nothing I can see is slipping, but obviously something has to be and if it is, it's doing it very precisely and consistently. I'll investigate that some more.
Chuck,
All lathes have some backlash but it would be taken up once the tool starts moving towards the headstock.
Willie,
The change gears are correct, otherwise I wouldn't be getting the correct TPI. I did triple check them though. My lathe does not have separate gears for imperial and metric. You swap places of two large gears to change from imperial to metric and I did check those. I also checked the threading dial gear, that's one of the first things I suspected.
I did try cutting the threads with the half nuts engaged at all times and it did cut the thread correctly, but I already knew it would. So I'm still perplexed as to what is going on. I think I'll sleep on it and maybe I'll have an answer come in a dream.
Ed