Re: [Emc-users] jerk control
On 8/26/21 10:38 AM, andy pugh wrote: > On Thu, 26 Aug 2021 at 00:34, Alexander Brock > wrote: > >> There is an elegant way to compute exact derivatives without computing >> analytical derivatives by hand. Here is a nice introduction: > > Is that applicable to the LinuxCNC kinematics functions? (Which are > kernel modules written in C). The idea can be implemented in C and for simple cases like 1D funktions it should be fairly straight-forward. The beauty with C++ is having templates and operator overloading so the kinematic function needs to implemented only once and can then be used for all datatypes (double, Jet). Also, operator overloading makes code more readable, for example in C++ I could write (random example): x = cos(4*t) + 2*t*t + 9 and it works with Jet but in C that would probably translate to something like x = sum(cos(product(4,t)), product(2,t,t), 9) I'm using C++ 99.99% of the time so if I would be tasked with providing derivatives in a C program I would try to make some kind of library / module where I just use C++ for the actual computations but I don't know how that would work or what the downsides would be. Best Regards, Alexander ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] jerk control
On 8/24/21 1:08 AM, andy pugh wrote: > I have a feeling that kinematics is not a problem in most cases, the > kins functions run fast enough to be used for finite-difference > differentiation / numerical integration. There is an elegant way to compute exact derivatives without computing analytical derivatives by hand. Here is a nice introduction: http://ceres-solver.org/automatic_derivatives.html#chapter-automatic-derivatives Best Regards, Alexander ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Example configuration for THC + stepper
On 03/13/2017 03:49 PM, John Thornton wrote: > It really has nothing to do with the GUI, it's something you add to your > hal file. I just use a setp to enable it when I start my GUI ( I used to > use a check box but would forget to check it lol). How can I create a configuration which provides the nice gmoccapy-plasma gui, runs my steppers using the parport and uses thcud for THC? Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Example configuration for THC + stepper
On 03/12/2017 11:46 PM, John Thornton wrote: > Are you using the thcud component? Do you mean this? http://linuxcnc.org/docs/html/man/man9/thcud.9.html I'm not using it at the moment but it seems this provides what I need / want. Would you suggest to a) integrate it in the gmoccapy-plasma config shipped with linuxcnc b) integrate it into a "mill" configuration generated with stepconf c) something else? Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- Announcing the Oxford Dictionaries API! The API offers world-renowned dictionary content that is easy and intuitive to access. Sign up for an account today to start using our lexical data to power your apps and projects. Get started today and enter our developer competition. http://sdm.link/oxford___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Example configuration for THC + stepper
Hi, I forgot to mention that I use the parport interface. Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- Announcing the Oxford Dictionaries API! The API offers world-renowned dictionary content that is easy and intuitive to access. Sign up for an account today to start using our lexical data to power your apps and projects. Get started today and enter our developer competition. http://sdm.link/oxford___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Example configuration for THC + stepper
Hi, I built a XYZ router and attached a plasma cutter to it with a THC module which gives me "Arc ok", "up" and "down" signals. I figured out how to use Stepconf to move the stepper motors but I can't get the THC part to work. Does someone have a similar / example configuration? I saw that there is a example for simulating plasma operation in "configs/sim/gmoccapy/gmoccapy_plasma", but I don't understand how I need to modify it so it moves my steppers and actually uses my plasma cutter. Is it better / easier to modify the gmoccapy_plasma so it actually does something or should I try to modify the mill configuration which does already move the steppers? Best Regards, Alexander -- Announcing the Oxford Dictionaries API! The API offers world-renowned dictionary content that is easy and intuitive to access. Sign up for an account today to start using our lexical data to power your apps and projects. Get started today and enter our developer competition. http://sdm.link/oxford ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Torch Height Control
On 09/10/2016 12:35 PM, Marius Liebenberg wrote: > The cncprofi work very well and with no fuss. I used it many times. I finally had time for my project again and I bought the cncprofi one. I managed to connect it to the plasma and it seems to work (shows up and down and it changes when I shout at the plasma operator that he should lower / raise the torch :-)). I tried to adapt a configuration used for a servo router but failed, does anyone have a working configuration for a stepper router with a plasma torch? IIRC I have LinuxCNC 2.7.0 but I'm willing to upgrade it if necessary. Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- The Command Line: Reinvented for Modern Developers Did the resurgence of CLI tooling catch you by surprise? Reconnect with the command line and become more productive. Learn the new .NET and ASP.NET CLI. Get your free copy! http://sdm.link/telerik___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Torch Height Control
On 09/11/2016 04:22 PM, John Thornton wrote: > Does is have connections to measure the tip voltage? I'm not exactly sure, it has a connection named "CNC" and it might be either an input for starting / stopping the cutting or an output for measuring tip voltage. Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Torch Height Control
On 09/10/2016 01:21 AM, John Thornton wrote: > What kind of plasma torch do you have? This one: http://www.stamos-welding.com/s-plasma-125h Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Torch Height Control
On 09/09/2016 10:58 PM, John Thornton wrote: > Most LinuxCNC users use this one as do I. > http://mesaus.com/index.php?route=product/product=65_id=64 > or > http://mesaus.com/index.php?route=product/product=65_id=65 > depending on your plasma torch. Thank you for your answer :-) I have a HF arc start with pilot arc functionality, there are 3 cables: - thick cable for +, connected to torch - thinn cable for pilot arc ignition, also connected to torch - thick cable for -, connected to clamp which I attach to the material I want to cut. Do I need 2 of the AD converters to monitor cutting arc and pilot arc? What would be an appropriate resistor to protect the THCAD? Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Plasma Torch Height Control
Hi, I recently bought a Plasma Cutter and built a CNC router and now I want to add a Torch Height Control to it. I found these models, does anyone have experience with them or experience with other THC systems? http://www.ebay.de/itm/172288076009 http://www.ebay.de/itm/262439946439 http://www.cncprofi.eu/product_info.php?info=p860_profi-plasmabrenner-hoehe-controller-thc.html Best Regards, Alexander signature.asc Description: OpenPGP digital signature -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Python script find center from 3 locations
Am 24.03.2010 20:27, schrieb Stephen Wille Padnos: Ries van Twisk wrote: The forumla might be right, looks a bit long to me :), there are better/other ways... It looks so ugly because it contains the general solution of a system of equations. That's why computer algebra systems were invented, nobody wants to solve such equations by hand. http://mathforum.org/library/drmath/sets/select/dm_center_circle.html The case for a CNC is even simpler, because we don't have to use any three random points. Sometimes you cannot choose, e.g. because the hole is damaged or partly covered or it's only a half hole. Alexander signature.asc Description: OpenPGP digital signature -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Python script find center from 3 locations
Hi, Does anyone know if there is a script for emc similar to in mach 3 where you can touch of multiple edges of a circle and it will calculate the center for you? I don't know such a script, but if you just want to calculate the center, here is a description of the solution: http://mathforum.org/library/drmath/view/55233.html This is not the only solution, I'm currently trying to find a closed formula which is easy to implement. Alexander signature.asc Description: OpenPGP digital signature -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
