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Robert LaLonde
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I was just thinking about the fact that some metals seem to finish better if you take a bigger depth of cut. 4140QT and most stainless come to mind.
Now, I have some more modestly long tapers to cut. I can't really use a follow rest, and no matter how careful I am using a steady rest in the middle always seems to leave me worry away at a slight mismatch where the first and second half of the turning meets up. If I could cut it all in one pass from your stock a follow rest would work, but the diameter difference is enough that just won't work. If I try to cut the full length with enough DOC to get that good finish I'll get a little chatter in the middle. Would a spring loaded follow rest that engages the work pieces a little before the chatter chows up be able to give enough to finish to the end of the cut and have enough spring force to prevent chatter in the middle of the cut? Ideally it would be finished based on measurements taken from previous heavy cuts, and the follow setup based on chatter marks from previous cuts.
The only other thing I can think of is taper turning fixture paired with some sort of scissor mechanism that moves a follow rest the opposite direction the same amount as the cutting tool. I'm thinking still spring loaded to take up an variance, but then it would be constant back force the length of the cut.
Or is this just another one of my overly complicated dumb ideas?
Now, I have some more modestly long tapers to cut. I can't really use a follow rest, and no matter how careful I am using a steady rest in the middle always seems to leave me worry away at a slight mismatch where the first and second half of the turning meets up. If I could cut it all in one pass from your stock a follow rest would work, but the diameter difference is enough that just won't work. If I try to cut the full length with enough DOC to get that good finish I'll get a little chatter in the middle. Would a spring loaded follow rest that engages the work pieces a little before the chatter chows up be able to give enough to finish to the end of the cut and have enough spring force to prevent chatter in the middle of the cut? Ideally it would be finished based on measurements taken from previous heavy cuts, and the follow setup based on chatter marks from previous cuts.
The only other thing I can think of is taper turning fixture paired with some sort of scissor mechanism that moves a follow rest the opposite direction the same amount as the cutting tool. I'm thinking still spring loaded to take up an variance, but then it would be constant back force the length of the cut.
Or is this just another one of my overly complicated dumb ideas?