Gene, my MPG works great. Does not have any lag at all. The 400ppr did throw me off at first when the machine jogged four times the jog scale. I put a fix for that in the MPG comp I wrote, it just divides the jog scale by whatever the mpg-pulses parameter is set to, 4 in this case.
I like the 400ppm as I don't need to use a lowpass like with the 100ppm MPGs to get smooth motion. Kurt On Thu, Feb 23, 2017 at 10:44 PM, Jon Elson <[email protected]> wrote: > On 02/23/2017 08:31 PM, Gene Heskett wrote: > > But I think its something we may be able to outwit in the hal file. > > > > They appear to have a power save shutdown, and a power up lag. > > > > And seem to have timings independent from each other. This is going to > > cause, unless we scale the encoder down by 4, one edge received occurs > > just as you start to turn it by hand, and again some milliseconds later > > after YOU have stopped turning the dial. When you stop moving it, it > > goes back to zero volts a few milliseconds later. > > > > > Sorry, Gene, you are wrong. They don't power down, but the > detent draws the dial to the state where A=B=0. > If you hold the dial between detents, the A or B outputs > hold at whatever level they should. When you let go, it > drops into the detent again, and outputs are zero. This is > all as it should be. > > YES, it gives 400 quadrature counts per rev, so you need to > scale the encoder by a factor of 4 to get rational units per > detent step. > > Jon > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
