thread sling shot on trim

[cmack]

What causes the thread to be sling shot back on a trim?
where it ends up being too short?
I have one machine that does this regularly

[Mama Kass]

I don't have time to answer, but try searching "thread needle trim." These words should give you plenty of prior posts to look at.

[Greenwing]

This is actually the knife adjustment when the thread is cutting both sides of the loop pulled around the hook.