Giles, I've writed a Postscript program (resolution independent) that generates the disc, you change the external/internal diameter and the number of slots and it draws directly onto the printing device and, you can fit several inside an A4 sheet. But I guess if you convert from PS to DXF you will lose resolution. >I don't think I can help the the RPM you are dealing with, but.. >I am wanting to make an encoder using film. I have at my disposal f 1/8mil >photo plotter. Does anyone have access to a DXF or drawing of an encoder >wheel? > >Best regards, >Giles ----------------------------------- Ricardo Seixas rseixas@pobox.com -----------------------------------