Facing Copper Help

[JWB_Machining]

Hey,

I have small rectangular tensile specimens (gauge Width 0.112) that I need to face down so they are flat. They're 0.182 Wide and 2.0" long. They're thickness varies from one end where it is 0.100" thick to 0.070" thin. I plan on milling an aluminum block so that It is about .050" short of my vise jaws and resting the specimen on there. I'm wondering if anyone has feed or speed suggestion along with depth of cut. I'm thinking either two cuts 0.016 deep or 0.028 and then 0.005.

I plan on using a solid carbide 2 flute 0.25" Diam TiAlN Coated end will at 4,000 RPM with .003 IPT and flood coolant. Is this good or any suggestions?

[JWB_Machining]

Well for anyone who's curious I faced these parts just now with the cutter I said I was going to use. I had 4000 RPM and a Feed of 2.0 ipm. The finish was mirrorlike and there weren't any bad burrs. I took passes at a depth ranging from .010" to .005" and they all came out great. Too Be honest I probably could have upped the feed by a lot but I figured if it ain't broke don't fix it, since it was just two parts.

[ironDigit]

uncoated cutters should work even better on soft materials like alu/copper and even plastics and wood ,because they are sharper.But like you said : don't fix it if it ain't broke ,but if you do get that 100.000pcs. yesterday order it might be worth while trying.


Atleast sharper is better when it comes to copper and make sure the workpiece keeps as cool as possible.

i get some very nice results on uncoated 2/3/4mm four flutes on 13/16rpm's milling pockets at 2mm depths of cuts and just cranking handles.
And make sure to get the right coolant ,i used to hate how my cutting fluids would color my workpieces.

good luck.