The open source CNC Torch Table is now working (download Torch Table CAD file here). We aim to start cutting tractor parts with it today. We tested it first with a marker on a dry-erase board for replicability. This shows that a toolpath can be re-produced reliably. (Read the tutorial for converting CAD files to manufacturing (CAM) files here)
We’re getting approximately 1/32 inch repeatability for 4 passes over the same region – see photo of line detail. The first 2 passes are black, the last 2 passes are red:
The gradations on the tape measure are 1/16″.