I think I just learned something.

   I am trying to bore a 5 inch diameter hole in 6 inch diameter aluminum
   bar stock
   about 5 inches deep.

   I was getting tool chatter.  At first I thought I needed a stiffer boring
   bar. My boring bar is about .75 inch in diameter.

   I discovered if you speed up the carriage feed the chatter
   goes away more or less.

   Some of you guys on here are expert machinist.

   Have you heard of this before ?

   Paul Lamar


Yep, it can be caused by light chip load of the tool. Tool have a min chip load, too light and the tool chatters, basicaly micro skipping. So you can increase the chip load by higher feed rate or IPR ( tool feed rate of inches per revolution) or a larger depth of cut.

David Mikesell
San Jose California


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