Abstract
Scott Smith, University of North Carolina, explains that for most tools, the phenomenon that limits metal removal rate (mrr) when milling is the onset of chatter and not available spindle power or the tool's strength or wear rate. He states that for a given tool, toolholder and spindle, some spindle speeds are more stable against chatter and some are less stable and that can be expressed in a stability lobe diagram. A stability lobe diagram for a long, slender endmill involves an extension of 104mm from the end of the holder for a length-to-diameter ratio of about 8.8:1. The stability lobe diagram is calculated to 30,000 rpm when the spindle has a 20,000-rpm maximum speed and at the 20,000-rpm top speed, the tool can only take an axial DOC of less than 0.1mm without experiencing chatter that represents a low-power cut. The tool system's natural frequency controls the locations of the stable gaps in a stability lobe diagram. The natural frequency can be lowered by making make a tool more flexible by extending it.
| Original language | English |
|---|---|
| Pages | 22-23 |
| Number of pages | 2 |
| Volume | 62 |
| No | 3 |
| Specialist publication | Cutting Tool Engineering |
| State | Published - Mar 2010 |
| Externally published | Yes |