04-05-2013, 09:02 PM
The non-other Dave has a point, how far from the chuck are you parting off? If more than twice the work diameter it could be the work flexing, not the tool... Also make sure the parting tool is dead square to the spindle axis - I either use a square against the work or run the blade/holder against the face of the chuck then lock the toolpost down.
Something I've noticed, a lot of new turners pussy-foot a bit when parting off - chatter's often down to too small a depth of cut, so if you're not slowing the lathe, wind it in harder and faster and see whether it stops chattering! I usually part off as close as I can get to the chuck with the power cross-feed, 10 thou" / rev or more works well (admittedly on a heavy and rigid lathe with 3hp) for me... A lot of people advise against power feed when parting, I know, but it's important to have a consistent depth of cut rather than allow the tool to rub!
Dave H. (the other one)
Something I've noticed, a lot of new turners pussy-foot a bit when parting off - chatter's often down to too small a depth of cut, so if you're not slowing the lathe, wind it in harder and faster and see whether it stops chattering! I usually part off as close as I can get to the chuck with the power cross-feed, 10 thou" / rev or more works well (admittedly on a heavy and rigid lathe with 3hp) for me... A lot of people advise against power feed when parting, I know, but it's important to have a consistent depth of cut rather than allow the tool to rub!
Dave H. (the other one)
Rules are for the obedience of fools, and the guidance of wise men...
(Douglas Bader)
(Douglas Bader)