I just did some experiments with my mill using parameters from the machinist-toolbox. Worked perfectly. I did this short video for a friend to show him what LinuxCNC was doing. https://youtu.be/clQeNsEu6yw G83 Z-0.5 R0.09375 Q0.09375 F20 M3 2974 The material was cast aluminum scrap and WD40 for lubricant. The load per flute was 0.0035 and SFM 73. That gave me RPM 2974 and a feed rate of just over 20 ipm. However most of the online calculators for drilling call the load per flute as cutting feed in inches per revolution and don't take into account the number of teeth so their value is half the feed rate at about 10 ipm. In soft gummy cast aluminium feeding too slow results in gumming up the works and generally breaking a tool bit. So where the Machinist-Toolbox software lets you specific the number of cutting edges (flutes) why don't the online ones do this? Or are you supposed to 'know' that you then multiply the feed rate by the number of teeth? Thanks John "ELS! Nothing else works as well for your Lathe" Automation Artisans Inc. www dot autoartisans dot com
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