Lathe Trepanning - 99.9% Not Brain Surgery

G'day everyone, As the title suggest, today we will not be delving into the subject of archaic medicine (also called trepanning), but instead we will be looking at a more efficient way of creating large holes in workpieces. I am looking to create a few mounts for some nema 23 stepper motors (for a project that may or may not materialize). The holes I need are roughly 38mm. That is a relatively large hole. A hole saw is not great in steel and boring it to size would take a long time and would waste a lot of steel (although it is the method I was planning on using). Trepanning seems like a good method to try out here. Trepanning is like parting, expect we are parting on the face of the workpiece. Because the only cut we need to complete is a thin groove, the cut can be done quicker with less material wasted. I will grind up a tool and attempt to cut aluminium and steel. I also want to take a look at annular cutters for cutting smaller holes, roughly 18 mm and up. I have been recommended them for quite some time and given that I am going to be making a few extra die holders, I though that annular cutters would be the perfect tool for the job. In addition to testing them I will also make up a basic tool holder to use them with. I hope you enjoy the video. #machining #annularcutters Annular cutters Annular cutter holder Making an annular cutter holder Trepanning Lathe Trepanning Timestamps 0:00 - Introduction 1:57 - Tool Grinding 3:04 - Lathe Trepanning 7:41 - Making an Annular Cutter Holder 15:16 - Testing The annular Cutters