Hi
I have an older Delta Rockwell circa 1953 wood lathe which IÂ’ve been using for several years now. IÂ’ve learned to turn bowls on it and it was working fine. I rebuilt the unit with new bearings and a new motor system. I mainly have been doing twice turned bowls, from logs which I have cut, turned the 1st pass then dried the bowls and did the 2nd pass at least 6 - 8 months later. IÂ’ve experienced no issues during this process until lately.
Now over the past week, IÂ’ve tried to do the 2nd pass turning of the bowls (cherry, walnut and birch) and each time I start to get vibrations on the outside of the bowl near the rim. When I first put the dried bowl on the lathe I use a wooden plate mounted on a flange on the lathe. It has carpet foam glued on the board and I use the tail stock to press the bowl against the flange so I can true up the bowlÂ’s tenon and also the outside of the bowl. While doing this I have no chatter issues when truing up the outside of the bowl, even near the rim.
When I take the bowl and mount it in my 4-jaw chuck (Super Nova 2) and then try to trim the outside of the bowl, I keep getting chatter marks within 1 inch or so of the rim. I find no play in the spindle shaft in the headstock, nor wobble in the chuck. The sound it makes when I am truing the outside, is ear piercing. IÂ’ve been trying push cuts (bevel riding) and pull scraping cuts with a spindle detail gouge, but still the problem occurs. These are the exact same cuts IÂ’ve used successfully many times before.
Any suggestions as to what might be the problem(s)? I do think its something to do with the lathe and not my technique.
Please see the pix below.
Thanks in advance.
Â’mark