German to English Tech/Engineering Automation & Robotics milling

Mit der Taste Bundaustrag start leitet der Steuermann den Bundaustrag ein.

Out of one of these typically poorly written automation manuals, this time a "Haspelablauf" (coiling). No more context available for above sentence.

I have never heard of the term nor found it anywhere with a proper definition or translation. Can anyone help?

Thanks in advance!