A couple years ago, I made a very quick and dirty rotary broach for a project i was working on in my normal job
it worked for the purpose it was intended, but i wanted to make an improved version.
Shop Made Rotary Broach
i have a job that requires a square hole to be pierced through a piece of machined steel. the material is too thin to be push broached for fear of fracture.
i don't have pull broaches or the puller for that matter, so i'm doing the next easiest method i have seen.