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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