Fixed the slipping problem for the most part but different glass ware behaves differently because of their shape. Stemless wine glasses seem to be the most troublesome.
I use a strip of tape (either masking or sellotape) around the top rim of the glass for grip on the drive wheels and then weigh it down with a glass ball. Works with most glasses. Instead of tape you can use a rubber band but haven’t found one the right size.
I spray the glass with spray-on chalk before etching. Works a treat and washes off very easily with water.
Have found that it is most important that the longitudinal axis of the rotary attachment is aligned. If the two sets of wheels are off even slightly the glass will act like a screw.
Still playing with power and speed settings. If anyone wants any more detail let me know.
Cheers
