On Saturday 22 May 2010, Michael Jones wrote: >Thanks Jon, > >I may be able to figure out the part with the resolution.. even if I >have to put up with lower resolution though, I need to get OpenGL >working. I've heard that the NVIDIA drivers have some issues (causing >latency ) with the realtime kernel and that the opensource NV drivers >are recommended? > In fact, I have found that even the nv driver makes the latency figures suck. Not nearly as bad as the nvidia drivers though. When I first built up my micromill, I was not able to get it to move more than 3 or 4 IPM without stalls, so on IRC one night someone suggested I try the nv driver, so I converted it back to use the nv driver.
It was enough better that I could get it into the teens per minute before the stalls started. And I noticed the motors sounded a little more musical but the tones weren't really all that pure. Someone a few weeks later said I should try the vesa driver, which does limit the screen resolution a bit but its usable, and my 20 tpi X and Y tables can now run at 25 IPM, which quite pure sounding tones, no raggedness to them at all. The Z was another surprise, as I had excised the original 20 TPI screw that ran up the back of the post, in favor of a 10 tpi that by turning the gear head 90 degrees, allows clearance past it to grab the Z sled about 2" in front of the post where the bolt is anchored solidly and doesn't turn. With a 425 motor on the OEM lashup, the sled was bound on the post and incapable of running a bathroom scale past about 5 pounds before the 425 started cogging in place. Now, with the screw in front of the post, and the nuts that drive it sitting in bearings located above the post and inline with the bolt, a 17 tooth pulley on the 425, and a 42 tooth pulley turning the nuts, I can run it down on the bathroom scales to 155 lbs before the motor starts cogging. And I can, if nothing gets in the way, run the Z axis at 34 IPM if the post is relatively clean & lubed with vactra. >I can't find anything on this, but will the NV drivers actually load >some form of OpenGL so axis will run or am I just spinning my wheels? I don't know as openGL runs with the vesa driver, and I'll let Alex confirm or deny that axis needs openGL. Whatever that answer is, its running the machine very well, on a 9 year old video card. Yes, the video could be better, but the machine runs great. >I don't think I loaded the proprietary Nvidia Drivers last time (I >can't be sure, it was a long time ago) and axis ran just fine. > >Recommendations? Try the vesa driver, its much kinder to the latency than anything else I have ever tried. >Thanks, > >Michael > >On May 21, 2010, at 7:44 PM, Jon Elson wrote: >> Michael Jones wrote: >>> I'm currently having problems with a reinstall after switching some >>> stuff around. >>> >>> I recently moved some hardware around in my shop. I decided I >>> didn't >>> need that nice LCD monitor on the CNC machine so I switched out a >>> decent CRT monitor (Higher resolution etc). For some reason the >>> system would no longer support any resolution higher than 800x600 >>> (even though it had run as 1024x768 on the LCD). >> >> Modern monitors have a digital communication between video card and >> monitor, so the computer can sense the capabilities of the monitor. >> If the computer can't get that info, it may restrict the video modes >> to >> those that couldn't possibly damage any monitor. It could be just the >> video cable doesn't have the necessary wires to pass that info, and a >> different cable would fix it. I have run into that problem myself. >> >>> I tried installing compiling and installing NVIDIA video drivers >>> which >>> completely screwed things up.. >>> >>> I figured that I would just re-install the whole system from the new >>> 2.3 ISO (after backing up my configurations and such). This was a >>> bad move. My favored gui is Axis and unlike the 2.2. iso, the 2.3 >>> iso did not install everything properly to run EMC with Axis on this >>> system (OpenGL wouldn't work and I couldn't get it to support higher >>> resolutions than 800x600). >>> >>> SO.. The saga continues.. I installed Ubuntu 8.04 distro, drivers >>> etc.... got everything configured the way I wanted it.. (Including >>> OpenGL) and then installed EMC 2.3.. as soon as the realtime kernel >>> kicked in.. The NVIDIA drivers that support OpenGL would NOT work >>> with >>> the realtime Kernel, and NV would not support OpenGL (I'm not sure if >>> this is normal or not). >> >> Yeah, the Nvidia driver thing is a major hassle. And, the drivers are >> specific to a particular kernel, every time you change kernel, you >> have >> to rebuild the driver for that kernel. >> >> >> Jon >> >> ------------------------------------------------------------------------- >>----- >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > >--------------------------------------------------------------------------- >--- > >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. 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