[jsclark]

I have a straight up question!, What is a the best end mills for plunging out corners of a pocket in 7075-T6 Aluminum?? I have tried a few brands of 2 flute solid carbide endmills and from I have read, 2 flute seems to be the best but cant find any recommendations on brands, flutes, coatings, etc?

Any info would be great,
Thanks!

[awerby]

Try a drill-point endmill or drill-mill: 2 Flute Carbide Drill Mills - MariTool ; most endmills have a flat end, which isn't good for plunging even if it is a center-cutting design, which many are not. Coatings can help, but aren't essential.

[jsclark]

I ordered some 2 flute carbide drill mills and will give it try when they come in and post the results. Thanks for taking the time to help me out, greatly appreciated!!

[aarggh]

Whichever ones you get, avoid the gold TN coated ones as aluminium generally tends to stick to the coating and really gums up.

cheers, Ian

[Nissan20det]

Ooops! (Deleted)

[Nissan20det]

I agree with everyone so far good advice! Donno about anyone else but I have had alot! of luck when dealing with 7075 using TiALN (black coated) 3 flute .030 corner radius solid carbide endmills with a 60 degree helix. Dont necessarily need the corner radius but it does help.

I know the tight twist of the flutes helps chip evac quite a bit. Not sure wile plunging altho maybe give it a shot. I get alot of chatter with 2 flutes when plunging, So I always have used 4 flutes to plunge until I tried thos tight helix 3's and I'll never use another one agian. Damn near all around those seem to be superior on aluminium to all others I have tried.

[dbruins]

... g TiALN (black coated) 3 flute .030 corner radius solid carbide endmills with a 60 degree helix. ...

Where'd you buy these? What brand?