Technical Resources rushmoretoolsadmin February 26, 2018 February 27, 2018 Tapered End Mills Speeds & Feeds Calculation Probably the most important factor affecting economical milling is the determination of cutting speeds and feeds. When using tapered end mills, base the feeds (chip-loads) and speeds (RPMs) on the smallest diameter of the taper. Using correct calculations increases tool life and productivity. Speed And Feed Chart For Threadmills When cutting an internal thread, the linear feed rate needs to be reduced to compensate for the ratio of the tool's cutting diameter to the major diameter being cut. If you do not compensate, the feedrate that the cutting edge sees will be much greater and tool failure will occur. The threadmilling feedrate is equal to: (major dia - cutter diameter)/major diameter) x linear feed rate. Cutting Data For Variable Helix Unequal Index Solid Carbide End Mills
