Edge finding and centre finding tools are indispensable when attempting precision work in a three axis milling machine. I take a look at some simple and not so simple tools which can be employed to locate work so that accurate offsets and positions can be found on a part.
Using a real world example, I also try out a new tool in conjunction with TouchDRO. A cheap 3D touch probe can be added to TouchDRO with a simple three wire interface and a set of edge finding tools in the TouchDRO app help to provide a graphical representation of the process.
The quick set quill handle featured in the video was one that I found on a YouTube channel called "Projects Down Under"    • DIY 'Quick' Reposition Quill Handle f...  
You can purchase the touch probe here (not sponsored) https://www.aliexpress.com/item/10050...