What mill bits?

[blackburn mark]

Sorry for the Noobie questions on this.

behave yourself we are all here to learn :)

it can be slow and painful cutting aluminium on a router but that tends to be a machine limitation but theres nothing stopping you cutting posh shapes with these cutters

i mostly cut acetal on my machine without any lube/coolant and these cutters last a long time for me

iv cut aluminium when i have to and use WD40 for lube or the cutter will bog down re cutting the chips that havent cleared in tight slots, you need to get them chips cleared if you can... it can get pretty messy if your using lube and blowing the chips out with air, somtimes ill just lube and forgo the compressed air at the expence of tool life the tool can still bog down and snap in deep slots but the 1/8" single flute cutters are cheep enough to do some science and see what happens

EDIT: there are plenty of 1/8" engraving bits on ebay... iv used a few in alli and plastics with no problems