On Friday 18 August 2017 15:17:44 Les Newell wrote: > Hi Gene, > > It should run on any RT flavour. I have used it on both RT-Preempt and > RTAI. I'm not sure how well it will work on your dc motor. It is > designed to run with separate speed + direction outputs. The output > speed command never goes negative. > > By the way, if the spindle keeps twitching instead of running up to > speed you probably have fwd/reverse swapped somewhere. > > Les
Not a problem, the final interface to the sheldons vfd is a spinx1, takes separate fwd/rev signals. And a pwm input, 1 to 98% duty. Works as expected. But ATM no feedback to spindle, doesn't seem to be required. Does rigid tapping just fine as long as its slow enough, slow being defined as not more than 150 rpm. (the turnaround overshoot is the problem on both lathes, those chucks are HEAVY, TLM is spinning a 5" 4 jaw!) So it might take me a while to try it out, but I will, right now I am fighting with the bedding on the 6.5 creedmoor barrel I just installed in old meat in the pot, aka AT&T. That and it doesn't want to feed the smaller shell too well. It was slicked up for a 30-06 Ackley Improved 50 years back up the log. Thank you Les. > On 18/08/2017 20:04, Gene Heskett wrote: > > This looks like it could be useful on my sheldon, or even on TLM as > > its 1 hp dc motor is being controlled by one of the Pico > > pwm-servo's. Both have fairly high count encoders, so that data is > > available. > > > > This I am assuming could replace the currently used PID module on > > TLM. On the G0704 too. but again only 2 gears. > > On TLM, only 2 gears, but 8 on the sheldon even if I have yet to > > actually do any work with the backgear engaged as I've found the > > motor doesn't seem to overheat when not subjected to any huge torque > > boost, it can run at 7.5 Hertz, pulling well enough to get the job > > done. Even at that low frequency, the slow rise past that point, set > > in the vfd, results in a fairly brutal start. > > > > However I see an RTAPI call used, and that current Jessie install is > > running the Sheldon just fine with a -uspace build running on > > the "4.4.4-rt9-v7+ #7 SMP PREEMPT RT" kernel. I only have 2 threads, > > the usual 1 millisecond servo-thread, and a 100 Hertz jog-thread. > > Can this be adjusted to build and run in the jessie preempt-rt > > environment? > > > > And, will it build and run as is on the wheezy installs running the > > 3.4-9-rtai-686-pae #1 SMP PREEMPT Debian 3.4.55-4linuxcnc i686 > > GNU/Linux kernel? > > > > Thank you, Les. 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-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
