Aluminium fail (and recovery)

First try at milling 2017 Aluminium, I reused the settings that worked so well in 6061 (see Winston’s video), and…it ended up in a minor disaster, gummy cut and eventually a broken endmill (yes, I should have stopped the cut earlier).

After scratching my head a bit, I realized the Makita was set to 12.000 RPM instead of the expected 10.000RPM that went with my feedrate (760mm/min). Second try with correct RPM vs feedrate (I actually scaled both RPM and feedrate by x1.5 too) and I got the cut on the right.

Reminder of the day, a 20% difference in RPM matters!


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