Stuart Stevenson wrote: > I replaced the bulbs in the scale read heads. I have a good signal > into the DRO from each scale. BULBS? You mean incandescent filament lamps? Yikes, that is OLD! All the major scale manufacturers quickly moved to LEDs back in the very early 1970's, as soon as the IR LED was invented.
You may want to replace the bulbs with IR LEDs for longer life and freedom from vibration sensitivity. > Sheffield has the replacement parts BUT the expense is incredible. > The bulbs, just the little bulbs not the read head, were $160.00 each. > I haven't priced the amplifier/converter board. I am afraid to. I > don't think I even want to know. > SO ---- > The scale feedback to the DRO is four wires with a sin wave on > each. These are supposed to be 0, 90, 180 and 270 degrees. Is there a > way to convert the sin wave into a pulse? Somebody mentioned Heidenhain, they usually use current, not voltage, for their analog scales. Use a comparator comparing the 0 and 180 to get the A channel, and 90 against 270 for the B channel. This will give the basic resolution of the scale, without interpolation. Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
