Chatter Problems - HELP!

[Dean Center]

deleted, superfluous.

 

[John Grace]

Question...once the chattering starts have you ever stopped mid-chatter so to speak and re-sharpened your tool? I don't turn spindles often but sometimes I forget when was the last time I sharpened a given tool, especially when turning ash or hickory, and a refresh on the blade clears things up.

 

[robo hippy]

Grayson, well, given the diameter of that spindle, maybe the skew is not the best tool for the job. I am mostly a bowl turner, but I can manage okay with a skew since the same general principals apply. One cause of the chatter could be too much bevel rub/tool pressure. That diameter is also getting to the point where I would use a peeling cut, or a spindle roughing gouge, then use the 80 grit gouge/abrasives to straighten things out. I don't think I have ever done an end grain spindle that size with a skew.

robo hippy

 

[Kent Reisdorph]

Thanks for the suggestions and the insight. I’ve made heavy cuts, light cuts, carbide tools, all of the above from both sides of the blank; It happens regardless. The tailstock is engaged as well. I’m truly at a loss.

Can you turn that one-handed with a bowl gouge? If not, your tools aren't sharp enough.

 

[Ed Sandle]

At this point I would try and clean up those spindle threads with a triangular file as previously mentioned, you really have nothing to loose. There is quite a bit of thread before that, so I feel there is plenty of strength left. I also need to say this next thing, and that is a file may not actually work for that as that spindle should be a hardened piece and will be very difficult to file for anything more than small burrs. You may have to actually grind that away with a Dremel and their thin wheels.
Regardless of how you fix it, the piece should screw on without resistance till it contacts the spindle face. If yours doesn't after attempting to fix, it either needs more fixing, or you have also damaged the threads on your accessories also.
As was mentioned, some lathes with their corresponding chuck thread inserts, oneway I think, will work with screwing the set screws down as the spindle has a groove for that. oneway does this because of their outboard attachment. If not turning on an outboard spindle, you should never need to use set screws.

 

[Terry Brown]

Threaded accessories for most lathes have part of the threads removed on their inboard end. This is to give clearance for them to bottom out against the spindle face, NOT the small shoulder where yours is hitting. Since your lathe has 1 1/4" x 8 threads. Your shoulder diameter probably should be 1 1/4" or less. If larger, the Laguna tech. representatives will need to be consulted. The inboard area of your faceplates. etc. have some threads removed. This space needs to be large enough in diameter and depth to encompass the shoulder without touching it. Please let us know what you find out.