Re: [Emc-users] Will a Dell Optiplex 755 work for LCNC?
On 11/22/2014 01:52 AM, Gregg Eshelman wrote: I got it cheap, real cheap. Has 4 gig of PC5300 DDR2 and a Core 2 Pentium 4. Also has a low profile PCIe x16 video card. It's small enough to be mounted inside the cavernous 1990 vintage control cabinet I stripped all the original electronics out of. Most importantly it has a parallel port to which I can connect a Pico universal stepper controller. Some of the last Optiplex machines had too much BIOS stuff in them, and that interfered with the RT performance. You may have to tweak some of the BIOS settings and mess with LAPIC and other oddities. But, try it with the live disk and do the latency test. if that works well, then you are golden. if not, some investigating online may turn up the setting to get good RT latency. I have a 650 here that gets the real time delay message every now and again. I use it for testing boards, not running a machine, so I don't worry about it. Jon -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Will a Dell Optiplex 755 work for LCNC?
I use a 755. Had to tweak the latency, but that is not a problem for the sort of stuff I am doing with it. On Sat, Nov 22, 2014 at 2:32 PM, Jon Elson el...@pico-systems.com wrote: On 11/22/2014 01:52 AM, Gregg Eshelman wrote: I got it cheap, real cheap. Has 4 gig of PC5300 DDR2 and a Core 2 Pentium 4. Also has a low profile PCIe x16 video card. It's small enough to be mounted inside the cavernous 1990 vintage control cabinet I stripped all the original electronics out of. Most importantly it has a parallel port to which I can connect a Pico universal stepper controller. Some of the last Optiplex machines had too much BIOS stuff in them, and that interfered with the RT performance. You may have to tweak some of the BIOS settings and mess with LAPIC and other oddities. But, try it with the live disk and do the latency test. if that works well, then you are golden. if not, some investigating online may turn up the setting to get good RT latency. I have a 650 here that gets the real time delay message every now and again. I use it for testing boards, not running a machine, so I don't worry about it. Jon -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Will a Dell Optiplex 755 work for LCNC?
I saw the 755 refurbed for sale on the WMT web site today. It was pretty cheap, if anyone is interested. It is not in their stores. On Sat, Nov 22, 2014 at 9:50 PM, Charles Buckley rijrun...@gmail.com wrote: I use a 755. Had to tweak the latency, but that is not a problem for the sort of stuff I am doing with it. On Sat, Nov 22, 2014 at 2:32 PM, Jon Elson el...@pico-systems.com wrote: On 11/22/2014 01:52 AM, Gregg Eshelman wrote: I got it cheap, real cheap. Has 4 gig of PC5300 DDR2 and a Core 2 Pentium 4. Also has a low profile PCIe x16 video card. It's small enough to be mounted inside the cavernous 1990 vintage control cabinet I stripped all the original electronics out of. Most importantly it has a parallel port to which I can connect a Pico universal stepper controller. Some of the last Optiplex machines had too much BIOS stuff in them, and that interfered with the RT performance. You may have to tweak some of the BIOS settings and mess with LAPIC and other oddities. But, try it with the live disk and do the latency test. if that works well, then you are golden. if not, some investigating online may turn up the setting to get good RT latency. I have a 650 here that gets the real time delay message every now and again. I use it for testing boards, not running a machine, so I don't worry about it. Jon -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- ... Jack Whatever you do, work at it with all your heart... Colossians 3:23 Anyone who has never made a mistake, has never tried anything new. - Albert Einstein You don't manage people; you manage things. You lead people. - Admiral Grace Hopper, USN Tell me and I forget. Teach me and I remember. Involve me and I learn. - Ben Franklin -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Will a Dell Optiplex 755 work for LCNC?
On 11/22/2014 2:32 PM, Jon Elson wrote: Some of the last Optiplex machines had too much BIOS stuff in them, and that interfered with the RT performance. You may have to tweak some of the BIOS settings and mess with LAPIC and other oddities. But, try it with the live disk and do the latency test. if that works well, then you are golden. if not, some investigating online may turn up the setting to get good RT latency. I have a 650 here that gets the real time delay message every now and again. I use it for testing boards, not running a machine, so I don't worry about it. Isn't LPT latency pretty much a non-problem when using a controller like the Pico instead of a cheap breakout board? --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Will a Dell Optiplex 755 work for LCNC?
On 11/22/2014 10:39 PM, Gregg Eshelman wrote: Isn't LPT latency pretty much a non-problem when using a controller like the Pico instead of a cheap breakout board? No, actually it still is somewhat of a problem. A 100 us delay would be a serious problem for software step generation, as it might even cause the step generation thread to crash (overrun the whole thread period and the RT system may hang when it tries to start the thread while it is still running). 100 us delay will cause a 10% fluctuation in perceived velocity, assuming a 1 ms servo thread period. The Pico stepper board has no way to handle this, so it appears as though the speed just jumped 10% and it will try to adjust. The Pico PWM controller has velocity estimation using time stamps, and so it will be just a little more immune to this. So, it all depends on the magnitude of the latency. 100 us delay on a 1 ms thread is not catastrophic, but it isn't GOOD, either! So, if the WORST latency that ever shows up is well under 100 us, then, YES, it is pretty much a non-problem on less critical machining tasks on low-speed machines. But, you have to QUANTIFY the latency before saying it is a non-problem. Jon -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Will a Dell Optiplex 755 work for LCNC?
I got it cheap, real cheap. Has 4 gig of PC5300 DDR2 and a Core 2 Pentium 4. Also has a low profile PCIe x16 video card. It's small enough to be mounted inside the cavernous 1990 vintage control cabinet I stripped all the original electronics out of. Most importantly it has a parallel port to which I can connect a Pico universal stepper controller. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
