Need Help!- BOBCAD SURFACING FINISH DETAILS PLEASE

[solidbob]

MACHINING ALUMINUM 6061 USING A FADAL 4020 AND BOBCAD V20. I NEED TO GET A NICE SURFACING FINISH, WHAT SPEED, FEED, STEP OVER, TOLERANCES, Z DEEPTH, ETC NEED TO USE . I ALREADY TRIED ON 2 PARTS AND STILL GETTING A BAD FINAL FINISH. ANY RECOMENDATION WILL BE APPRECIATED.

[orizaba]

Ok, I'll give it a try.
What type of geometry are you finishing? (a surface, 3d geomotry, etc..)
How smooth do you need it to be. I have found that when the mill is trimmed correctly, and I have a GOOD endmill, I can almost get a mirror finish if I take .015 on the finish pass when facing the bottom of a pocket.
I usually cut 7075, and I'm not a machinist (hobby cutter ), so this my be bad advice

[solidbob]

is a surface finish, need to be really clean , almost for no polishing need it. Any suggestion?

[highspeedmazak]

What tool size? insert type? are you useing coolant? This is a face mill correct?

[solidbob]

this is a surface cutting, 0.187 ball, using coolant.

[woffler]

if it is a flat surface ditch the ball end mill use a 2 or 3 flute 3 flute would be better tin coated and a new end mill crank your mill all the way up as far as spindle speed use a feed of 3.0 per and a good coolant and flood it good .and a depth of cut of .010 this should greatly inprove your finish.just my two cents.