Greetings I am very happy with Peter's comments on the handling of Index and polarity.
On frequency, my calcs. are like this: Lathe: Spindle speed up to 3500 RPM. Threading and tapping will be slower than this but very handy to have actual spindle speed display of whole range. Encoder at 500 lines (gives 0.18 deg resolution) and easily sourced. A/B pulse train 29.2 kHz though on some encoders Index can be very narrow. In this case, if one does need it, a hardware latch with control by A/B would not be hard. Mill: Potential spindle speed 12,000 RPM. With 500 line encoder = 100 kHz so probably necessary to limit display of actual speed or use 100 line encoder with a software quadrature decoder. I would like to have a driver that presents the data from the one hardware decoder that is visible on the 'bone headers. That would easily do very high speed spindles. 100 line MPG is a walk-in-the-park but nevertheless will be very useful. Best wishes John Prentice -----Original Message----- From: Charles Steinkuehler [mailto:[email protected]] Sent: 26 January 2014 17:54 To: EMC2-Users-List Subject: [Emc-users] Encoder Index Support Survey I'm working on adding software encoder support to the BeagleBone PRU code. Counting up/down is easy, but I'm wondering how to deal with the index pulses. Both the Mesa VHDL code and the existing software encoder component have quite a variety of options, and I'm wondering if it is necessary to support them all (more options = longer code = lower operating frequency). If you use encoders on your machine, what options do you have set for the HAL component, and (if you know) what is the maximum pulse frequency for your machine? -- Charles Steinkuehler [email protected] ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
