Greetings all; Does anyone have a 256 line/rev encoder that would like a 1000 line version?
Sitting on the rear of the motor, with the encoder filter in a 5i25 turned off, I can get to around 1750 spindle rpms before the 5i25 encoder falls over and the tach drops to zero. Looking at the signals, it may yet be in the SainSmart BOB as the encoder has a differential output, and I'm only useing 1 of the leads. When enabled, the motor settles at about 3x what the encoder can track, and looking at the bob with a scope, I see its something north of 1.8 MHz with an rc slew rate limited waveform, which the bob cleans up to a square wave but nowhere near a 50% duty cycle, 15% high time maybe. I have some comparators of the *86 variety that I can make differential receivers out of, which should even up the duty cycle to around 50%. But I'm not sure that will be enough since the motor, in high gear, can do 2950 at the spindle until a thermal in the windings stops it for about a minute. So I normally don't run it above 2750. So I'll make the differential to single ended gizmo to see if it might be enough. If thats not enough, maybe somebody wants a higher resolution encoder they can direct couple to their spindle? I just noted the encoder_sample is set for 500000 in the ini file. Would turning that up help, or is that the limit? Thanks all. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
