I am interested in milling 7075 T6 sheet material at 4mm thickness. I have some experience on milling aluminum alloys. for example I milled 5086 H32 alloy with 3mm endmill at 2000rpm and 70mm/min feed. result was perfect.
However with 7075 T6 I brake my endmills even if I cut as slow as 10mm/min. my endmills are HSS with 8%Co and I think the problem is to be worn out.
I start cutting 7075 T6 with 10mm/min feed and 2000rpm, after about 5cm cutting endmill brakes.
What should the feed and spindle speed for 7075T6 material? Is there anyone have som experience about milling this material? Should I use carbide endmills?