I am an engineer (Australia) and……. I am a little concerned that your are test running the motor on the bench with the earth disconnected…… particularly when you suspect that there may be a short to earth from the windings. It’s your life and you you shouldn’t be doing such things when you need...
I have had a 6090 Chinese machine for the last 10 months and what a learning curve. Freecad is my Cad Software of choice. I was well experienced in Autocad for some years up to around 2012 and 2D software is VERY different to 3D. Freecad gives an ability to design parts and also has a combined...