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- Aug 25, 2007
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I've avoided using my 11" Logan lathe of late because the runout on the 3 jaw chuck has become intolerable. I finally measured the runout tonight and it was close to .020" out. My first thought was that the scrolls or the teeth on the jaws were getting badly worn... the chuck is 16 years old and was made in India.
On a lark, I decided to check for runout on the chuck body, and to my surprise, it was also out by more than .015". I removed the chuck from the back plate, leaving the backplate mounted on the spindle and when I checked it, the face was close to .015" high on one side. So, I made a couple of passes across the face of the back plate where it meets the back of the chuck. I also turned down the register lip that fits inside the back of the chuck since it was also out. This, of course, meant that the chuck no longer fit tightly over the register but that didn't matter. I plan to make a ring that will let me adjust the chuck for center but in the mean time, I just snugged down the bolts, then used a rubber hammer to tap on the side of the chuck until it was exactly centered. I was able to get the runout down to under .001", so, needless to say, I'm deliriously happy with my Logan again.
Chuck
On a lark, I decided to check for runout on the chuck body, and to my surprise, it was also out by more than .015". I removed the chuck from the back plate, leaving the backplate mounted on the spindle and when I checked it, the face was close to .015" high on one side. So, I made a couple of passes across the face of the back plate where it meets the back of the chuck. I also turned down the register lip that fits inside the back of the chuck since it was also out. This, of course, meant that the chuck no longer fit tightly over the register but that didn't matter. I plan to make a ring that will let me adjust the chuck for center but in the mean time, I just snugged down the bolts, then used a rubber hammer to tap on the side of the chuck until it was exactly centered. I was able to get the runout down to under .001", so, needless to say, I'm deliriously happy with my Logan again.
Chuck