- Joined
- Dec 22, 2011
- Messages
- 715
OK, this is my first real project. Actually the first one was a combination carriage stop / dial indicator holder that I needed for the collet project. My Logan lathe is kind of an odd ball in that the spindle doesn't have a taper. It's just a straight bore at a little over one inch diameter. After researching quite a bit I felt that an ER-40 was probably my best option. I've seen Bob Wright's version and Jim B.'s but as a relative newbie to this wasn't quite ready to jump in. Then I talked to Jan at Tallgrass Tools and he made me a "kit" with all the raw material, a set of drawings and instructions.
The drawings and instructions were actually for two different designs. One used a purchased closure nut which meant the chuck had to have metric threads. The other design used Imperial threads and a fabricated nut. After studying the drawings I felt like the fabricated nut was a little beyond my capabilities. So I bought a couple of change gears that would allow me to cut the 1.5mm pitch metric thread and purchased a nut and a few collets.
I didn't get many action shots but here's one where I'm drilling the body so I can get a boring bore in:
This project had a bunch of first's for me; my first metric threads, first internal threads and first taper. They all went pretty well. Here's the final result:
I had a piece of 2" round stock laying around and thought what the heck, I need the practice. So I decided to attempt the other version. I made the body out of the round stock but still had the piece of hex from the kit to attempt the nut. It was a little tricky because of the "reverse" taper for the nose of the collet and the eccentric ring that lets the collet release from the nut. But......it turned out pretty well and actually works.
After a little tweaking, both versions have a little under .001" run out. I was happy.
Thanks for looking.
Steve
The drawings and instructions were actually for two different designs. One used a purchased closure nut which meant the chuck had to have metric threads. The other design used Imperial threads and a fabricated nut. After studying the drawings I felt like the fabricated nut was a little beyond my capabilities. So I bought a couple of change gears that would allow me to cut the 1.5mm pitch metric thread and purchased a nut and a few collets.
I didn't get many action shots but here's one where I'm drilling the body so I can get a boring bore in:
This project had a bunch of first's for me; my first metric threads, first internal threads and first taper. They all went pretty well. Here's the final result:
I had a piece of 2" round stock laying around and thought what the heck, I need the practice. So I decided to attempt the other version. I made the body out of the round stock but still had the piece of hex from the kit to attempt the nut. It was a little tricky because of the "reverse" taper for the nose of the collet and the eccentric ring that lets the collet release from the nut. But......it turned out pretty well and actually works.
After a little tweaking, both versions have a little under .001" run out. I was happy.
Thanks for looking.
Steve
