If you're really doing a lot of these, you might consider a mister. It massively decreases cutting time, and allows the use of higher flute counts because the tool stays cool.
It was the best $180 we have ever spent on tooling. We have two of these at my shop, one for the mill and one for the lathe. This will make the finish better, and is gentler on the endmill.Ī commercial solution to the air blower idea is called a mister (which also mixes in a bit of coolant/lubricant via venturi) and can be bought from somewhere like Enco for around $90USD. Make sure your part is really, definitely not going to move. If you can make a mount for a blower gun to shoot air at the bit while you use the router, I guarantee you will get a better finish, cut faster, and have less risk of breaking endmills.Ī side note which you may have already considered, is that when cutting aluminum at high RPMs with a router, sturdy workholding is going to be essential. It keeps the tool from getting so hot that the chips stick and clog the flute. Also, in addition to using lubricant, compressed air will keep the tool cooler, which makes a more consistent cut and helps eject hot chips. A 1/4" carbide single flute is what he uses for almost all aluminum jobs - the smaller endmills seem to snap too easily. My friend who has a CNC router says that single flute endmills work best, because you get more chip clearance (room for waste aluminum to eject), especially at high RPMs.
#ROUTER END MILL BITS FOR ALUMINUM MODS#
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