Ball graining lithography machine - Print shop (India)

The machine gives a surface grain to the offset printing plates by the impact of small steel balls or pebbles driving an abrasive against the plates.

When I took the photo I was not sure exactly what this machine was, but it was moving making a lot of noise, and the metal balls that you see are moving over some printing plates. See a video of a similar machine in action.

I took this and those other photos in a small Print Shop / Book Editor in Delhi, called Jayyed Press.