Side Milling....singing

[behindpropeller]

I need some advice on side milling.

When I am cleaning up parts and milling .75-1" LOC at once it always sings.

Am I taking too much off? Not enough? Increase feed? I was leaving .005 stock before running around the part for the final cleanup.

Tim

[questionful]

I'm a noob at machining but the other day i was cutting some aluminum on a bridgeport and it was screeching. the rpm was too fast. what material are you cutting, with what diameter tool, and at what rpm?

[Delw]

you cutting aluminum on your HAAS?

Get a 2-3 flute ALUM cutting Carbide endmill, for some reason Haas sings with not alum cutting endmills in when cutting alum. they will cut steel and others fine but using a general carbide endmill for alum sings bad and leaves a crappy finish. use a tool steel endmill and you dont have problems but they dont last as long and flex. On my fadal I can use a general endmill with no problems.

the other thing haas is finicky on tool holders get quality ones or you will get chatter and singing as well.
what size dia endmill are you using?
I noticed this problem in 3/8 and 1/2" both with collet holders and set screw holders.

oh yeah with a gar alum cut, I can run a 3/8" endmill 12k rpms at 100-125ipm full width and full depth ( just over .800 deep). and you wont hear it cut.
some of my hog outs I been doing up to 200ipm but backed off on the depth of cut. I have a 5 fluter here I have yet to try but its suppose to be amazing with extreamly high feeds in alum.

Forgot to add.
Make sure its a quality tool like Garr or harvey tool, sg's, most of the chinese and cheap so called alumin cutting dont work worth a crap in there alumin cutting endmills. Garr and harvey your looking at about 30-50 bucks each but they will last you for ever.
Delw