in the last months I have had request to etch wine glasses. while doing one offs would be easy to do with a vinyl stencil and sandblast. the last request was for a winery to do and order of 1000. The glass they will use is almost 4 inches in diameter. I know this will not fit in the the forge. but I have been thinking about the problem. with a background in mechanics and lack of electronic know how I came up with this
my theory :
the gantry travels in X ( right and left) and Y ( front to back) if you disconnect the rubber tracking band from both sides of the gantry you will eliminate the Y moment. The wine glass will need to rotate at the needs speed of what the gantry would travel. this can be done by doing the math and using gear size. So why could we not build the rotary system to harness/tap into the rubber tracking band. So when the GF thinks its moving the gantry it would actually be rotating a gear set that in-turns rotates the wine glass.
completely mechanical rotary system using the GF itself to power it. simple manual alignment would be needed to start. then allow it to run itself.
I know this does not solve the problem of the depth of the forge
Thought on this from people that like to think out side the box.