- Joined
- Mar 8, 2015
- Messages
- 320
I decided I wanted to make a chuck for holding er32 collets that would fit on the spindle of my 11 inch Logan. I found an er32 holder that attached with a flange on eBay. I then took a round chunk of aluminum and machined it to screw on the spindle of my lathe. This was quite a chore since my spindle is 2 1/4" x 8 tip. In addition to that the last half inch of the spindle is not threaded and is actually a bit oversized. 2.310". I kept at it and ended up with a nice fit. I mounted the piece on the spindle and trued up the face and the OD. I then bored about a .200" recess that fit the OD of the er32 adapter. Since i machined it with it mounted on the spindle, I knew it had to run true. The er32 adapter came with three holes tapped with metric threads, so I planned to drill them out to fit 1/4" bolts. I found out the steel was hardened, so I used 10 -32 bolts instead. (They fit inside the threaded holes.) I'm not worried about whether 10-32 is strong enough since the recess is doing all the work.I chucked a piece of 1/2 " rod in it and checked the runout. Somewhere around .001.