Searching…
At 20% stepover, the maximum chip thickness is 80% of your actual IPT feed rate (radial chip thinning), so you can actually increase your feedrate by 25%. Your spindle hp and rigidity will be limiting factors, but thi...
For example, if you feel that our calculators consistently give you too high feeds for milling stainless steel, you can set the feed factor for this pair to 0.8.
Cut Width, also called Stepover, is the total thickness of the cut when viewing the cutting tool from above. It can be no more than 100% of the cutter's diameter.
Stepover depends on the tool, but 20% is a good starting point and very conservative. Play with chip thinning calculators to increase your speed with smaller stepover.
Flat end mills have a flat cutting surface. They can use a larger stepover for parts with flat surfaces but may need a smaller stepover in the corners of complex parts.
In aluminum I usually use a 1/2" 3FL 1.25LOC endmill at 15% stepover, 7500RPM, and 135IPM. In steel I usually use a 1/2" 7FL 1.25LOC endmill at 10% stepover, 5300RPM, and 120IPM.
TIP1: Since annular cutting is a plunging operation, it should generally be performed at 75% of the speed and 25% of the feedrate of the calculated peripheral cutting parameters (as with endmill plunging).
Using the data tables and the milling formulas below, you can calculate the speeds and feeds of any carbide end mills and diamond end mills. Are you using a Harvey tool? Click here for speeds and feeds specific to your tool.
Maximizing depth of cuts above 2 times the diameter of the tool is common when Optimized Roughing. Smaller radial step-overs make such depths of the cut possible. A larger step-over would increase the amount of heat i...
Master the art of milling with the ultimate guide to end mill feeds and speeds. Learn how to select the optimal settings for various materials to achieve maximum efficiency and precision.
