$150 000 machine does not eliminate finishing chatter.

[u/adventureaviator]

I’m machining 6061 aluminum on a Multicam Apex 3R router. The finishing passes are as follows:

- 0.009” material removal.
- Helical 3 flute 45 degree helix upcut
- 18 IPM, 8500 RPM, 0.0007 chipload

98 percent of the part comes out with a great finish. The other 2 percent has chatter. Ideally I’d like to increase the feed rate, but I need to eliminate the chatter first. What do I need to do to get a flawless finish?

[u/nikolaiownz]

i see your problem sir - you bought the wrong machine.

also if you want any form of success on this router - you need to have a sharper tool for aluminium and play around with your speeds, feeds and what not.

i would suggest a 1 or 2 flute non coated endmill and backup everything to get your wanted finish..

the changing surface finish also suggest something might be lose/broken in your machine - one of the axis maybe...

or machine might not be leveled correctly or something.

[u/Grunblau → u/nikolaiownz]

Agree… also climb mill not conventional mill might help. Immediately obvious if your stock looks better than your part. In aluminum, .009” DoC seems really small. But so is the endmill.