Generic speed and feed values?

Hi, I built a large-ish CNC machine with a 2.2kw spindle and 7075 aluminum but and I am scared to use it because I cannot find reliable speed or feed values and I think the default values are too aggressive and will snap the tool. I have some aluminum 6061 plates I want to mill for a 3D printer heated bed support and other projects and I have some generic 2 flute and 4 flute high speed steel metric end mills each ranging from 2mm to 12mm. The smallest holes to mill are 3.4-3.6mm in diameter and the smallest fillets have a 5mm radius. I am guessing I should use the 2 flute 10mm end mill for clearing most of the material and the 3mm end mill for the holes. I could really use some help with the settings because I don't want to die if a tool explodes.


I am using Fusion 360 and the default settings are:

Speed:
Spindle speed 5000 rpm
Surface speed 78.5398 m/min

Ramp spindle speed 5000 rpm


Feedrates:
Cutting feedrate 1000 mm/min
Feed per tooth 0.05 mm
Lead-in feedrate 1000 mm/min
Lead-out feedrate 1000 mm/min
Ramp feedrate 333.333 mm/min
Plunge feedrate 333.333 mm/min
Feed per revolution 0.0666666 mm

There are a number of feed and speed apps out there that you tell it what material you want to cut, what bit you want to use etc and it can calculate values for spindle speeds, feedrate, plunge/ramp speeds, depth of cut etc etc. Some of them will even warn you about potential issues such as tool deflection, rubbing etc.

Edited 1 time(s). Last edit at 06/20/2020 07:19AM by sdavi.