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| Building a New Lathe |
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| vtsteam:
So, what to do, what to do. I didn't fancy boring a new tailstock ram. Hmmmmmm. Wait a minute Didn't Vintage and Classic, Pekka, Neubert on this very forum mention using an insert for the threads in lathe rams? Why yes, they did! Of course.... :nrocks: :nrocks: :nrocks: |
| vtsteam:
So, on with the show..... Bore out the old wrecked threads and open out to .7495" Check. |
| S. Heslop:
No hope of finishing up the mostly cut threads with what was left of the mangled tap? |
| vtsteam:
Sorry to say Simon, no the tap wouldn't budge further. I later found the cause to be that the relief section was slightly eccentric, because it had only been drilled (not bored). This jammed the tap, I believe. The relief section was a tricky problem, because I wanted to preserve the Morse taper's small end (as much as possible) yet relieve for a 1/2" jack screw at the other end. This really required an odd size drill that I don't have. I have a full range up to 1/2", but then it jumps to 5/8". Unfortunately, 5/8" would eliminate a lot of the narrow end of the Morse #2 taper. I was hoping that an older 1/2" drill, cutting a little oversize, would work in the hardest to reach section of the relief bore. But obviously, it didn't. Anyway, I forged ahead with the insert plan, I found an old piece of 1" OD bronze bearing material that I had bought years ago, and never used. It coincidentally was bored almost exactly to the tap drill size for a 1/2" 10 TPI Acme thread. Sheer luck! So I chucked that up in the lathe and started turning the outside down to get a light press fit in the tailstock ram. |
| vtsteam:
While turning, I noticed its bore was not on center with the OD. Since I had to consider that bore as final, I stopped the lathe, and readjusted the chuck off-center to match the bearing bore. This proved out one of the really great advantages of my faceplate-3-jaw chuck setup! It was a piece of cake to clock in the bore, rather than the OD. Then I continued turning the outside down, I got it to .750 and parted it off. |
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