- Joined
- Feb 19, 2013
- Messages
- 220
I purchased a 13 X 40 lathe about a year ago. It has a D1-4 3 jaw chuck mounted to the lathe. About a month ago, I noticed that work began slipping while being held in this chuck. I attempted to open the jaws, wipe out chips, and see if I could determine why the work is slipping. Each of the 3 jaws are tight and tracking. When no work is held and the jaws closed, the 3 jaws align tight in the center.
The work can be anywhere in diameter from 1/2 inch to 1 - 1/4 inch. I allow the piece to hang out from the chuck no more than about 2x diameter. Today, I was attempting to thread some 1/2 inch rod. The compound is set at 29 degrees. I zero the cutter to the work and begin to cut the threads. The cross slide is returned to "0" each time. I advance the compound about 0.004 for each pass. I cut down on the thread about 5 passes. On the next pass, the threads were turned off. After disbelief, I noticed that the work was moving back and forth in and out of the chuck. It appears that the chuck is loosening after being tight. and the work begins to slip. I am sure that the cutter was not digging in, no rough marks on the threads until the work just stops and slips in the jaws. I also attempted to hold the rod in the chuck, bring it out about 3 inches, bore a hole in the end of the rod and support it with a live center. (I thought that maybe I was applying too much side pressure at the end of the work) I also thought that the piece might be out of round, so I chucked up another 1 - 1/4 rod that was pre turned and smooth. I made sure that the T wrench was used and the work was tight in the chuck. I turned on the lathe and fed the cross slide in about 0.001. After engaging the long travel, I noticed that the work was stopped and it was being pulled out of the chuck. I stopped the lathe and attempted to move the work in and out of the lathe chuck and it was loose. I retightened the chuck, and again fed the cross slide into the work to just begin cutting but toward the headstock. The work again loosened up and stopped traveling into the headstock this time.
I have aligned the cutter to the center line of the live center on the tail stock again and again making sure that it is on center. The chuck keeps loosening up after the lathe begins to spin. Sometimes it takes 50 revs, sometimes it takes only 3 revs for the chuck to loosen. This happens either with the work held in only the chuck or held in the chuck and supported with a live center. (With the live center, work is out about 3 inches) No signs of the cutter digging in or catching.
anic:
The chuck is mount is tight, no wobbling or moving in and out.
Anyone have a clue as why this chuck is not slipping after numerous attempts to tighten it?
The work can be anywhere in diameter from 1/2 inch to 1 - 1/4 inch. I allow the piece to hang out from the chuck no more than about 2x diameter. Today, I was attempting to thread some 1/2 inch rod. The compound is set at 29 degrees. I zero the cutter to the work and begin to cut the threads. The cross slide is returned to "0" each time. I advance the compound about 0.004 for each pass. I cut down on the thread about 5 passes. On the next pass, the threads were turned off. After disbelief, I noticed that the work was moving back and forth in and out of the chuck. It appears that the chuck is loosening after being tight. and the work begins to slip. I am sure that the cutter was not digging in, no rough marks on the threads until the work just stops and slips in the jaws. I also attempted to hold the rod in the chuck, bring it out about 3 inches, bore a hole in the end of the rod and support it with a live center. (I thought that maybe I was applying too much side pressure at the end of the work) I also thought that the piece might be out of round, so I chucked up another 1 - 1/4 rod that was pre turned and smooth. I made sure that the T wrench was used and the work was tight in the chuck. I turned on the lathe and fed the cross slide in about 0.001. After engaging the long travel, I noticed that the work was stopped and it was being pulled out of the chuck. I stopped the lathe and attempted to move the work in and out of the lathe chuck and it was loose. I retightened the chuck, and again fed the cross slide into the work to just begin cutting but toward the headstock. The work again loosened up and stopped traveling into the headstock this time.
I have aligned the cutter to the center line of the live center on the tail stock again and again making sure that it is on center. The chuck keeps loosening up after the lathe begins to spin. Sometimes it takes 50 revs, sometimes it takes only 3 revs for the chuck to loosen. This happens either with the work held in only the chuck or held in the chuck and supported with a live center. (With the live center, work is out about 3 inches) No signs of the cutter digging in or catching.
anic: The chuck is mount is tight, no wobbling or moving in and out. Anyone have a clue as why this chuck is not slipping after numerous attempts to tighten it?
