Re: [Emc-users] Following Error with Steppers [SOLVED]
Quoth andy pugh. On 3 October 2013 13:22, Russell Brown russ...@lls.lls.com wrote: So. Why are the absolute values in the INI different to the ones in the HAL file? There's obviously some magic going on here :-) However, if the axis limits are exactly the same as the stepgen limits then the stepgen has no overhead to work with, and trouble ensues. So the stepgen limits on velocity and accel need to be a shade higher than the axis limits. That's the kiddy. Have a cigar Mr Pugh. I misinterpreted Peter Wallace's earlier comment in this thread when he said: One thing that is required is that the per axis stepgen maxaccel parameter be set to about 20% greater than the machine maxaccel for that axis. My befuddled brayne though he was talking about the INI STEPGEN_MAXACCEL setting. Too many settings with the same name! However even that's not the full solution. it used to be that the stepgen limits could be set to zero and the stepgen would simply do as it was told. I don't recall what changed there, or why it changed. In http://www.linuxcnc.org/docs/devel/html/drivers/hostmot2.html (13.2 Parameters maxaccel) is still says you can set it to 0. It is perfectly OK to add things to the INI file and reference them in your HAL file if you want to. It would be nicer if pncconf did this for you for those parameters, though. Can the code that expands the references in the INI file do multiplication then? It would need to be able to do this to maintain a working reference so you end up with: setp hm2_5i25.0.stepgen.00.maxaccel[AXIS_0]MAX_ACCELERATION * 1.2 setp hm2_5i25.0.stepgen.00.maxvel [AXIS_0]MAX_VELOCITY * 1.2 Because taking on board both your and Peter's comments, setting *both* the hm2_5i25.0.stepgen.XX.maxaccel and hm2_5i25.0.stepgen.XX.maxvel to the values in the INI file +20% makes everything work. Just changing maxaccel or just maxvel doesn't fix the 'Following errors' problem. Ta to everyone for their comments. I'll post sommat on the Forum for future reference. -- Regards, Russell | Russell Brown | MAIL: russ...@lls.com PHONE: 01780 471800 | | Lady Lodge Systems | WWW Work: http://www.lls.com | | Peterborough, England | WWW Play: http://www.ruffle.me.uk | -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60134791iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Following Error with Steppers [SOLVED]
On 3 October 2013 14:32, Russell Brown russ...@lls.lls.com wrote: My befuddled brayne though he was talking about the INI STEPGEN_MAXACCEL He was. Unfortunately it appears that the HAL file wasn't paying any attention to that. (and if the HAL isn't, then neither is anything else). I am not entirely sure what was going on there. Assuming that was a pncconf-created INI file. Can the code that expands the references in the INI file do multiplication then? Sadly not, it would be useful at times. I was suggesting that you could add a STEPGEN_MAXVEL to the INI file to keep the STEPGEN_MAXACCEL and then reference them both in the HAL file. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60134791iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Following Error with Steppers [SOLVED]
Can the code that expands the references in the INI file do multiplication then? Sadly not, it would be useful at times. Computations, loops, conditionals, procedures, etc. are doable in ini files using haltcl as a substitue for halcmd. The syntax for haltcl files is very similar to halcmd. Ini files can include both hal and haltcl files, and they can be intermixed with care: [HAL] HALFILE=core_sim.tcl HALFILE=otherfile.hal Ref: http://www.linuxcnc.org/docs/html/hal/haltcl.html http://article.gmane.org/gmane.linux.distributions.emc.devel/2518/match=haltcl $ man haltcl There is an example sim ini file in: configs/sim/simtcl/twopass_demo.ini The example uses the axis gui and provides procedures that implement the setup steps normally done with core_sim.hal, axis_manualtoolchange.hal, simulated_home.hal -- Dewey Garrett -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60134791iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Following Error with Steppers [SOLVED]
On Thursday 03 October 2013 14:46:18 Dewey Garrett did opine: Can the code that expands the references in the INI file do multiplication then? Sadly not, it would be useful at times. Computations, loops, conditionals, procedures, etc. are doable in ini files using haltcl as a substitue for halcmd. The syntax for haltcl files is very similar to halcmd. Ini files can include both hal and haltcl files, and they can be intermixed with care: [HAL] HALFILE=core_sim.tcl HALFILE=otherfile.hal Ref: http://www.linuxcnc.org/docs/html/hal/haltcl.html http://article.gmane.org/gmane.linux.distributions.emc.devel/2518/match =haltcl $ man haltcl There is an example sim ini file in: configs/sim/simtcl/twopass_demo.ini The example uses the axis gui and provides procedures that implement the setup steps normally done with core_sim.hal, axis_manualtoolchange.hal, simulated_home.hal Some interesting concepts there, thanks for the tut and links, Dewey. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) True happiness will be found only in true love. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60134791iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
