feeds and speeds

[Mortek]

What kind of feed would you use with a 1/4 ball mill 4 flute at 6000 rpm spindle speed in 7050 aluminum T4

[Rekd]

48 IPM at .002 chip load, or 96 @ .004

Chip Load x RPM x Flutes = Inches Per Minute

'Rekd teh Machine Shop 101

[Rekd]

Of course, this will depend on the depth of cut you plan on taking. Deeper cuts = lower CL

'Rekd teh afterthought

[Mortek]

what would you recommend. Right now I am taking .005 DOC per pass on z level finishing, I need the 1/4 for the radii to be right in the corners. But I also am spindle 3500 rpm 45 ipm feed at the .005 depth.

[Rekd]

If you're only doing .005 deep, wind it up as fast as it'll go, RPM and Feed. (Don't feed faster than your machine can handle.)

'Rekd

[CAMmando]

+1

I would program at 80 IPM

start at 50% Feed over ride on machine and work up.

THIS ASUMES THERE IS NOWHERE ON THE PATH THAT WILL ENCOUNTER HEAVIER CUTS SUCH AS POCKET WALLS.

If you get chatter while increasing the feed, dont be afraid to increase the feed through it.

Are you cutting exactly on tool center or up the radius ? If you are going over hills and through valleys you may experience chatter as the point of contact moves past the tool center.

CAM

[Mortek]

The endmill is hanging out about three inches would that make any difference? Nothing really in the way until the bottom of the part where the floor is on a compound angle. Gotta love those engineers.

[HuFlungDung]

Yikes, 3" overhang with a 1/4" dia tool is a lot. You couldn't talk 'em into letting you do it with a bullnose cutter? ( I know, you get modified corner radii)

I agree, engineers!! They tend to pull numbers out of thin air with n'er a thought for how it gets cut. And then they whine because it costs so much.

[Rekd]

Originally posted by HuFlungDung Yikes, 3" overhang with a 1/4" dia tool is a lot. You couldn't talk 'em into letting you do it with a bullnose cutter? ( I know, you get modified corner radii) I agree, engineers!! They tend to pull numbers out of thin air with n'er a thought for how it gets cut. And then they whine because it costs so much.

+2

'Rekd teh Engine Ears

[CAMmando]

3" overhang ... ignore my previous post unless you like "the flight of the bumble bee"

Probably will wind up back at lower RPM and feed due to Vibration.

Your gonna have to play at the machine.

Are you using carbide ? If not look at the "Tuffy" style ball mills, Carbide, with short LOC.

Some other thoughts ...

If your going up against walls, have the shank ground .005 under behind the cut. If there are no walls, try finding or making an extension (holder).

[HuFlungDung]

Mortek, maybe you'd have the best luck if you just shut the spindle off and drag the cutter over the part

[hardmill]

Originally posted by HuFlungDung Mortek, maybe you'd have the best luck if you just shut the spindle off and drag the cutter over the part

Golf clap Hu!!

PEACE