I think there is an encoder module within emc that allows a single channel encoder+index.. I know of one person using it on their lathe for threading.
sam ----- Original Message ----- From: "Jon Elson" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Friday, July 20, 2007 11:13 AM Subject: Re: [Emc-users] UnivPWM and Spindle Encoder > Kirk Wallace wrote: >> My lathe has a pulse generator with an index signal, but while trying to >> hook it up to my UnivPWM controller, I am beginning to think that it's >> not compatible with the controller. Are the encoder inputs only >> compatible with quadrature encoders? I can utilize a software encoder >> counter in HAL on another parallel port, but I believe that software >> counters would be too slow. Is fitting a quadrature encoder my only >> option? > > The UPC has quadrature inputs, and the EMC2 driver and threading > code all requires encoder counts, and a reset to zero on the > index pulse. So, your "pulse generator" just has one channel of > pulses? I can see one way to make this work, which is to delay > the single pulse with an RC delay or a one-shot circuit to turn > it into a simulated quadrature signal. > > First, here's what I'd do, is connect the pulse output to the > UPC's A encoder input, and connect a 10 K Ohm resistor between > the A and B encoder inputs. Then, connect a .01 uF capacitor > from the B input to ground. This will create a 100 us delay > between A and B, which should satisfy the counter as a valid > quadrature pattern. > > Try this first, if it doesn't work, I can give you instructions > to make a delay with a one-shot chip. > > Jon > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
