I wonder if someone could check my setting for cutting aluminium as I keep breaking end mills. The last time I had this settings. The aluminium is 6082 T651 18mm thick I am just using this to test. I'm trying to pocket out a 25mm diameter hole only 6mm deep and I'm only getting to half way round the second pass.
The bit is a 1/8th single flute carbide bit, the depth of pass is 1mm RPM is 15000, chip load I have as 0.003 which I workout as 1142mm per minute feed rate plunge rate I have as 126mm per minute, the coolant I am using it duck oil its like WD40 but does not evaporate like WD40 and is a better lubricator.

Recap. Aluminium is 6082
Bit is 1/8th carbide single flute.
feed speed is 1142 mm/per/minute
plunge rate is 126 mm/per/minute
spindle speed is 15000 rpm
depth per cut is 1 mm
step over is 30% 0.952 mm
chip load is 0.003

There must be something in there where I have picked up wrong for working out feed and speed.
This is how I worked out my feed rate.
Feed Rate = RPM x number of flutes x Chip load.

Which gave me 45 I/P/M then to change to metric I divide that by 39.374 which gave me 1.142 metre which is 1142 mm. or multiply 45" by 25.4 which is 1143mm

Or is this all wrong.