> I said it once already but I don't think everyone caught it: > on a spindle encoder used for threading and tapping, it > doesn't matter the slightest bit if you miss the index sometimes. > > You certainly must not stretch it longer than one count, > whatever you do. You would make the cure worse than the problem. > > Chris >
OK, it seems reasonable that EMC only needs to reliably sync to the index pulse once. If it is able to read the regular encoder pulses, then it will continue to know the true location even if future index pulses are missed. Of course any setup that can reliably read the encoder pulses is also likely to be able to read a one count wide index pulse. Requiring an index pulse that is only one encoder pulse wide is not reasonable as some types of encoders will not furnish such a signal. In my opinion the interface and/or polling software should detect the leading edge of the index pulse as an event and rely on that. Regards, Steve Stallings ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
