Quote Originally Posted by Drucook View Post
500mm per minute - correct - is it simply a case of spraying a bit of WD40 on the tool? I was planning to direct an air coolant spray at the tool/cutting surface to try to clear the chips....
You need both ideally. Some cut fairly dry, just spraying air but WD40 helps lubricate. The issue with Aluminium is that it builds up on the edge of the endmill's cutting edge and then starts to gum up. If you dont have air, a few squirts of WD40 should help a lot.