- Joined
- Apr 18, 2017
- Messages
- 24
First off, I am using A36 because scraps of it are free to me.
This piece had been cut with a torch and I squared it up with a grinder and cutoff disc, so there is a chance I was still milling in the HAZ area......
I was just attempting to face it smooth, I've had the mill for a while now and besides aluminum this was the first thing I really need to mill that was "heavy".
I chucked up a 2 flute (probably should've been using a 4 flute) 1/2" HSS endmill and tried to go at it. I started out trying to take .010" running at 1180 rpms, I had Excessive chatter so I slowed the feed rate down to a crawl, and it didn't help. I backed off to .005" but even at that I had a lot of chatter, enough that the down feed would back (shake) itself off while going across the 2" long cut, losing a couple thousandths. by the end. Through the cut, it had areas where it seemed to chatter more than others....
What do you think? Should I be able to take a .010" pass? Was it because I was using a 2 flute mill? Was it the HAZ? Wrong RPM's? Or am I trying to do too much?
This piece had been cut with a torch and I squared it up with a grinder and cutoff disc, so there is a chance I was still milling in the HAZ area......
I was just attempting to face it smooth, I've had the mill for a while now and besides aluminum this was the first thing I really need to mill that was "heavy".
I chucked up a 2 flute (probably should've been using a 4 flute) 1/2" HSS endmill and tried to go at it. I started out trying to take .010" running at 1180 rpms, I had Excessive chatter so I slowed the feed rate down to a crawl, and it didn't help. I backed off to .005" but even at that I had a lot of chatter, enough that the down feed would back (shake) itself off while going across the 2" long cut, losing a couple thousandths. by the end. Through the cut, it had areas where it seemed to chatter more than others....
What do you think? Should I be able to take a .010" pass? Was it because I was using a 2 flute mill? Was it the HAZ? Wrong RPM's? Or am I trying to do too much?