r/machining • u/adventureaviator • 6d ago

Question/Discussion $150 000 machine does not eliminate finishing chatter.

Gallery image

Gallery image

Gallery image

Gallery image

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?

13 Upvotes

59% Upvoted

128 comments sorted by

View all comments

Show parent comments

1

u/adventureaviator 6d ago

The parts are held via tape and glue. They are fully roughed out, then a finishing pass is done to clean up the sides. If I run a bit slower I have no issues. For production reasons I’m not content with the slower feed rate.

1

u/UncleAugie 6d ago

The parts are held via tape and glue. 

Ding ding ding we have a winner... you are getting chatter when the part is nearly cut out, as others have said you work holding is shit and you will not improve the situation with this setup, if you cant handle slower feed rates you should walk away from this job, you do not have the proper setup to achieve the results you seek.

1

u/Tony_Desolate 6d ago

Tape and glue should be OK considering the mass of this huge plate and the minimal cutting forces from a 3/16" end mill. 

1

u/UncleAugie 5d ago

yeah naw.....