I made an plastic screen just before coming back to Turkey, not 100% sure it might have been acrylic, but it works just as well. There's plenty of materials the right thickness, used for leaflet dispensers etc, it's finding the best one, and getting small pieces.
So yes it can be done with a very big proviso, it'll mark, scratch etc, very easily while you grind it if you catch it with the grinding blank. Ideally you need to work off all the edges and corners of your grinding blank until all edges are well rounded.
Then you'll find the screen surface may not be perfectly flat like modern glass, so you have to grind and work off any hot spots, then when flat wash well & use finer grinding paste.
It's better to use a different grinding blank for each grit size, especially with plastics/acrylics because each grinding blank itself gets a ground surface and a coarse blank with fine grit can undo the finer grinding work if your not careful.
adding: Should have thought of this before, the grinding blank ideally should be the same material and not glass, if glass is used you run a risk that the grit while grinding the acrylic is also grinding the glass blank and the glass particles cause problems.
Last edited by Ian Grant; 07-02-2010 at 01:46 PM. Click to view previous post history.