help with speeds

[buzzpettit]

I am machining brass in a small haas that the max rpm is 4000. the carbide mill i want to use is .250 which it says to use a speed of 11000. Is it ok to run in my machine at the 4000 rpm or would it just be best to switch to some HSS cutters??

[Matt@RFR]

You could run that tool at 100 RPM*, it's just not going to work as well as 10,000 RPM.

*Not recommended.

[aadrew10]

You can run carbide into brass at 4000 rpm. If I were you I would run HSS first, because I don't think you'll see any performance gain from carbide if your max rpm is 4000. Try both, see which one you like best.

[buzzpettit]

thanks for the info... i know the brass is soft so usinG HSS is ok just. I just had a carbide cutter so i thought i would ask... thanks for the ideas guys

[TRIMI]

I WILL DO IT 1200RPM F10.

[gizmo_454]

Personally, I don't care if you only have a 2500 rpm spindle. I would pick the carbide mill in a heart beat. You can run that carbide mill all day long and at the end of the day, you wouldn't see any wear. The HSS mill on the other hand, while it sure won't be junk, it will have some wear which will degrade your surface finish somewhat. Brass is very abrasive.

Good luck and have fun!

Mike