| Trouble | Possible causes Bright, but Wavy surface | Countermeasures ¡Reduce feed per tooth. ¡Increase fl utes; E.g. 2 fl utes/3fl utes, or 4fl utes. |
| Poor surface fi ih | Small chips are welded on surface. | ¡Increase cutting speed. ¡Use coolant or air blast, or increase coolant. ¡Make slight honing on the edge. ¡Upward milling/Down cutting. ¡Increase feed per tooth. Increase Depth of Cut. |
| i ns | Scratches on the surface | ¡Make slight honing on the edge. ¡Use non-water soluble coolant. ¡Down cutting/Upward milling. |
| Poor surface by over cutting | ¡Reduce depth of cut. ¡Increase cutting speed. ¡Reduce feed per tooth. |
| Finish size becomes a minus tendency. | ¡Upward milling/Down cutting. ¡Reduce depth of cut. ¡Replace chuck or collet to new one. ¡Reduce overhang length. ¡Increase cutting speed. |
| Poor accuracy | Poor straightness | ¡Reduce depth of cut. ¡Replace chuck or collet to new one. ¡Reduce overhang length. ¡Increase cutting speed. ¡Increase fl utes; E.g. 2 fl utes/4fl utes. ¡Reduce feed per tooth. ¡Check the edge. Change tool, when needed. |
| Chattering | | ¡Increase feed per tooth. Reduce feed per tooth, when current feed is more than 0.07 mm/t. ¡Change cutting speed. ¡Replace chuck or collet to new one. ¡Reduce overhang length. ¡Use 2 fl utes tool in roughing. Use 4 fl utes tool in fi nishing. ¡Down cutting/Upward milling. |