Hi , my first post to the forum. I work for a machinery builder and use a bridgport mill , lathe and haas tm1 . I'm just getting used to cnc machining. And have begun using the TM1 more and more for basic milling

I did a search but could not find any specific answers to this question,
We often make parts from steel and aluminum angle iron. usually 2x2 up to 4x4 size pieces for various brackets. what is the best way to fixture and mill angle iron lengths and squareness without all the chattering and squealing. I'm a "decient" machinist but everytime I need to do this I just cringe. There has to be a secret to making this job easier.

thanks in advance