I'll preface this by saying i am unsure if this is an issue with user error, CNCJS, ASPIRE, or TINYG.
For the the life of me the z height I cant seem to figure out. I have not successfully made a full cut on this machine yet. In the pics you can see when i zero out the z height and then z probe i end up more than 1/2" aay from the workspace.
I triple checked that that material was set correctly in aspire. Nothing I do gets the z height where it should be. The cut pattern seems correct but obiously z height isnt engaging
From your description, I assume your work flow is to design and generate Gcode in Aspire, then use CNCJS as CAM to manage delivery of the Gcode to tinyG.
I am not fluent in Aspire or CNCJS.
Perhaps for starters, leave your Aspire Gcode out of the picture.
Start up your machne with CNCJS connected as CAM.From the Serial console, execute a probe cycle from the command line.
Here is an old Forum reference https://www.synthetos.com/topics/how-to-locate-workpiece/#post-10934