Trim tabs are little bridges that help hold parts in place when cutting with a CNC machine. The idea is that you can’t cut the part out completely or it will start moving around. The little bits of material that you leave behind to hold it in place are called trim tabs.
I’ve been a little lazy and I often cut parts with out them. You have to pause the machine when the part breaks free (or is about too) or fish it out before the spindle touches it and sends it flying.
I just burned another fuse in my spindle driver so I’m going to have to slow down and use trim tabs more often.