- North America Some Questions about Face Milling
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*Registered User*
Some Questions about Face Milling
Hello all, this is also my first post.
I have been a lurker for a while, but I have finally decided to register!
A little about myself.
I am a fab guy (Machinist/Welder) working a government job.
The CNC machines I have are,
Haas TM1-P (Carousel Tool Changer)
Haas ST-20 Turret Lathe.
I am in the middle of running a job where I have to machine a piece of high carbon steel for 1st/2nd op, and I am getting really bad surface finishes.
The workpiece is sitting in a fixture .140" deep, as it's a thin part.
I am running a Kennametal 3 inch face mill with 5 inserts. All inserts are within .001 with no shims.
My feed rate is the following:
900 RPM 12.5 IPM taking .050 rough cuts with two .005 finish cuts at 2000 RPM at 20 IPM.
The finish I am getting looks as if the inserts are dragging and moving too slow, however, if I speed it up anymore it starts cooking the inserts.
Was hoping if someone had a better feed rate formula out there or anything else I missed.
Best,
-Andy
P.S. Not sure of the Kennametal inserts I'm using, but they are solid carbide with a coated finish.
Thanks.
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