Re: [Emc-users] Tool Shape
On Mon, Apr 21, 2014 at 1:47 PM, Marius Liebenberg mar...@mastercut.co.zawrote: Andy Have a look at this work. Maybe a good solution. https://github.com/bitsnbytes7c8/MegatronDB What's wrong with using proven, production-style databases that work well large or small? MySQL and postgresql are bullet-proof, have a large user base, and great support. And are easier to backup than just about any other free database. There are software utilities out there to hot backup both MySQL and postgresql. Mark -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On Mon, Apr 21, 2014 at 2:02 PM, andy pugh bodge...@gmail.com wrote: Possibly. The real work is in working out everywhere that tool data is used, and when changes get committed back to the DB. The details of the storage can be decided later (if sqlite proves to be not ideal). -- atp Why not leave the choice up to the end user as to which database they'd prefer to use? Mark -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On 22 April 2014 10:20, Mark Wendt wendt.m...@gmail.com wrote: Why not leave the choice up to the end user as to which database they'd prefer to use? This would work if the query language was 100% identical. I don't know if it is. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
With MySql you need to install LAMP and with postgresql it looks like you have to have a server running and create a user that can log into the server or something like that. Sqlite requires non of that. I've used MySql for web based PHP applications and Sqlite for local Python applications. Sqlite is far more portable IMHO than the other two. I don't recall having to do more than have import sqlite3 in the header of my python file to use Sqlite. The only catch with Sqlite is how it handles numbers and I've used text fields for number entries to work around that. JT On 4/22/2014 4:19 AM, Mark Wendt wrote: On Mon, Apr 21, 2014 at 1:47 PM, Marius Liebenberg mar...@mastercut.co.zawrote: Andy Have a look at this work. Maybe a good solution. https://github.com/bitsnbytes7c8/MegatronDB What's wrong with using proven, production-style databases that work well large or small? MySQL and postgresql are bullet-proof, have a large user base, and great support. And are easier to backup than just about any other free database. There are software utilities out there to hot backup both MySQL and postgresql. Mark -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On Tue, Apr 22, 2014 at 6:36 AM, andy pugh bodge...@gmail.com wrote: On 22 April 2014 10:20, Mark Wendt wendt.m...@gmail.com wrote: Why not leave the choice up to the end user as to which database they'd prefer to use? This would work if the query language was 100% identical. I don't know if it is. -- atp SQL is SQL. MySQL. postgresql and SQLite all use, SQL. The only differences between the three are in the database engine code and how it maintains and operates the database. Mark -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On Tue, 22 Apr 2014, Mark Wendt wrote: On Tue, Apr 22, 2014 at 6:36 AM, andy pugh bodge...@gmail.com wrote: On 22 April 2014 10:20, Mark Wendt wendt.m...@gmail.com wrote: Why not leave the choice up to the end user as to which database they'd prefer to use? This would work if the query language was 100% identical. I don't know if it is. -- atp SQL is SQL. MySQL. postgresql and SQLite all use, SQL. The only differences between the three are in the database engine code and how it maintains and operates the database. MySQL and PostgreSQL are heavy weight rdbm. SQLite is an embedded rdbm. There a many of the SQL standards and each of these rdbm attempt to adhere to parts of one of these standards. None of them are 100% compliant. I work with all of these rdbm on a daily basic. Richard -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On Tuesday 22 April 2014 11:22:14 John Thornton did opine: With MySql you need to install LAMP and with postgresql it looks like you have to have a server running and create a user that can log into the server or something like that. Sqlite requires non of that. I've used MySql for web based PHP applications and Sqlite for local Python applications. Sqlite is far more portable IMHO than the other two. I don't recall having to do more than have import sqlite3 in the header of my python file to use Sqlite. The only catch with Sqlite is how it handles numbers and I've used text fields for number entries to work around that. JT What sort of contortions are required to fully recover a number stored in SQLite as text? Seems like the unwary, me, could be bitten pretty easily. On 4/22/2014 4:19 AM, Mark Wendt wrote: On Mon, Apr 21, 2014 at 1:47 PM, Marius Liebenberg mar...@mastercut.co.zawrote: Andy Have a look at this work. Maybe a good solution. https://github.com/bitsnbytes7c8/MegatronDB What's wrong with using proven, production-style databases that work well large or small? MySQL and postgresql are bullet-proof, have a large user base, and great support. And are easier to backup than just about any other free database. There are software utilities out there to hot backup both MySQL and postgresql. Mark -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ 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. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
Hi, I'm facing a slightly unusual problem and before I head forward into the wrong direction I'd like to hear what you think about it: I have to pan a laser scanner (a single rotary axis), so I thought about using a BLDC (which I happen to have already), a MESA 7I39 BLDC controller and a BeagleBone Black. So, first question: Can I hook up the 7I39 to a BeagleBone Black. Well of course I can, but is this somehow supported already, so that it is simple to do? Any other driver suggestions? The bigger problem is that I need to synchronise the motion with a high 'frequency trigger' signal (about 50 Hz). The motion pattern needed is cyclic an has to look something like his: 0. move to home position (0°) 1. wait for low frequency trigger, a hardware or a software signal 2. within say 10° accelerate and synchronises to the 50Hz trigger so that the 10° position is reached 20ms after the last trigger and at a given speed (specified in degree per trigger pulse, not in seconds as the pulse rate of the trigger may change slightly) 3. keep on moving at the give speed (in sync with the trigger) for 100° 4. decelerate an move to a safe position 5. goto 1. and repeat the process in reverse direction How could I use LiuxCNC/Machinekit to synchronise the motion to the external trigger signal and ensure a specific position is reached at a specific speed in sync with the trigger? The reason why I want this is to make sure the scanner captures lines at the same angular positions. The trigger comes from the scanner an indicates the start of a line capture. Unfortunately the scan process can not be trigger externally, this would be much easier, but I only get a signal each time a scan line starts. Hmm, well. What do you think. Is LiuxCNC right for the job or not. See you Flo -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On Tuesday 22 April 2014 11:22:14 John Thornton did opine: With MySql you need to install LAMP and with postgresql it looks like you have to have a server running and create a user that can log into the server or something like that. Sqlite requires non of that. I've used MySql for web based PHP applications and Sqlite for local Python applications. Sqlite is far more portable IMHO than the other two. I don't recall having to do more than have import sqlite3 in the header of my python file to use Sqlite. The only catch with Sqlite is how it handles numbers and I've used text fields for number entries to work around that. JT_ LAMP is only required with MySQL if you are running MySQL in conjunction with a web server and PHP. Mark -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On 22 April 2014 16:23, Gene Heskett ghesk...@wdtv.com wrote: What sort of contortions are required to fully recover a number stored in SQLite as text? Why would you need to? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
On 22 April 2014 17:24, Florian Rist fr...@fs.tum.de wrote: So, first question: Can I hook up the 7I39 to a BeagleBone Black. Well of course I can, but is this somehow supported already, so that it is simple to do? Any other driver suggestions? The problem here is that the 7i39 expects a three-phase PWM signal, and I don't think that the BBB PWM code (if there even is any for the PRU) has a three-phase mode. You would have a simpler task either using something that drives Mesa cards (PCI or parallel) and a Mesa FPGA card, or using the BBB ethernet to drive a 7i90 (I am not sure this works). Alternatively the Pico PWM brushless servo amp only needs a single channel of PWM: http://www.pico-systems.com/acservo.html Any number of off-the-shelf drives from the likes of AMC are likely to be able to drive your motor Both the Pico and AMC drives are likely to need Hall sensors on the motor. If you need to you may be able to fake these with the bldc HAL component. 0. move to home position (0°) 1. wait for low frequency trigger, a hardware or a software signal 2. within say 10° accelerate and synchronises to the 50Hz trigger so that the 10° position is reached 20ms after the last trigger and at a given speed (specified in degree per trigger pulse, not in seconds as the pulse rate of the trigger may change slightly) 3. keep on moving at the give speed (in sync with the trigger) for 100° 4. decelerate an move to a safe position This sounds like fun. It might just work with a G33 or G33.1 synchronised move, or it might need an elaborate system of PIDs and PLLs. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Tool Shape
On Tuesday 22 April 2014 12:38:24 andy pugh did opine: On 22 April 2014 16:23, Gene Heskett ghesk...@wdtv.com wrote: What sort of contortions are required to fully recover a number stored in SQLite as text? Why would you need to? Something in the back of my mind, possibly from a past life, tells me there are often rounding errors in the recovery unless it is stored as the fprintf %ld format. But the memory is faint, goes back to writing an eclipse finder in C probably 20 years back up the log. I think, but cannot prove that when using the julian calendar, the backwards math chokes and upchucks all over itself somewhere around may or june 4713 BC. The original truebasic program I translated it from also suffered a similar fate IIRC, as was noted in the BYTE magazine article giving the truebasic code listing. That is apparently the origin time of that calendar, equ to the unix 1/1/1970, but it doesn't do negative numbers at all well. Possible moot for this application if enough digits are stored. AT least a double double (16 or 17 digits) stored as a double float should be ok. 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) Genes Web page http://geneslinuxbox.net:6309/gene US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
Hi Andy, thanks for you comments. Alternatively the Pico PWM brushless servo amp only needs a single channel of PWM: http://www.pico-systems.com/acservo.html Ah, I see that would make thinks much easier. And I'm not forced to use the Beaglbone I could was well you a micro/nanoATX board and a MESA FPGA card. I'm jut flowing the Beagelbone news with interest and one day I'd like to use it - this might not be the right project. Any number of off-the-shelf drives from the likes of AMC are likely to be able to drive your motor Both the Pico and AMC drives are likely to need Hall sensors on the motor. If you need to you may be able to fake these with the bldc HAL component. Oh, the motor has HAL sensors and 1000 CPR encoder and a 1:50 or so gearbox. 0. move to home position (0°) 1. wait for low frequency trigger, a hardware or a software signal 2. within say 10° accelerate and synchronises to the 50Hz trigger so that the 10° position is reached 20ms after the last trigger and at a given speed (specified in degree per trigger pulse, not in seconds as the pulse rate of the trigger may change slightly) 3. keep on moving at the give speed (in sync with the trigger) for 100° 4. decelerate an move to a safe position This sounds like fun. Hmm, not sure if its fun for me... :-) It might just work with a G33 or G33.1 synchronised move, Oh, good idea, instead of syncing to a spindle speed I use my scanner signal. I'll think about it and see if I understand the idea and can map my problem to rigid taping. or it might need an elaborate system of PIDs and PLLs. This is what I am afraid of and is even more complicated than a PLL as not only the phase (in this case speed) has to be correct but also a position. Is there something like a PLL component in LinuxCNC See you Flo -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
I think this could be done as a geared solution, if you could work from a phase locked (to 50hz) clock at some higher rate, and use that as the encoder signal, and the 50hz as a trigger to g76 with suitable parameters it would then be synchronised and have a flyback (gate the laser off then), or use g33 or play with the gearing that can be used with hobbing, see http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing (add any logic to suit). Dave Caroline On 22/04/2014, Florian Rist fr...@fs.tum.de wrote: Hi, I'm facing a slightly unusual problem and before I head forward into the wrong direction I'd like to hear what you think about it: I have to pan a laser scanner (a single rotary axis), so I thought about using a BLDC (which I happen to have already), a MESA 7I39 BLDC controller and a BeagleBone Black. So, first question: Can I hook up the 7I39 to a BeagleBone Black. Well of course I can, but is this somehow supported already, so that it is simple to do? Any other driver suggestions? The bigger problem is that I need to synchronise the motion with a high 'frequency trigger' signal (about 50 Hz). The motion pattern needed is cyclic an has to look something like his: 0. move to home position (0°) 1. wait for low frequency trigger, a hardware or a software signal 2. within say 10° accelerate and synchronises to the 50Hz trigger so that the 10° position is reached 20ms after the last trigger and at a given speed (specified in degree per trigger pulse, not in seconds as the pulse rate of the trigger may change slightly) 3. keep on moving at the give speed (in sync with the trigger) for 100° 4. decelerate an move to a safe position 5. goto 1. and repeat the process in reverse direction How could I use LiuxCNC/Machinekit to synchronise the motion to the external trigger signal and ensure a specific position is reached at a specific speed in sync with the trigger? The reason why I want this is to make sure the scanner captures lines at the same angular positions. The trigger comes from the scanner an indicates the start of a line capture. Unfortunately the scan process can not be trigger externally, this would be much easier, but I only get a signal each time a scan line starts. Hmm, well. What do you think. Is LiuxCNC right for the job or not. See you Flo -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
On 22 April 2014 18:20, Florian Rist fr...@fs.tum.de wrote: Is there something like a PLL component in LinuxCNC Not as far as I know. Or perhaps the better answer is not yet. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
Hi Dave I think this could be done as a geared solution, Of couse, I forgot to mention, there will be a reduction gear about 1:50 or 1:100, the motor is not very strong and the scanner ways about 5 kg and will be mounted eccentrically, so it will create quite some torque and inertial mass. if you could work from a phase locked (to 50hz) clock at some higher rate, I guess I could build a external PLL to generate more or less any frequency from the 50 Hz, yes. and use that as the encoder signal, and the 50hz as a trigger to g76 with suitable parameters it would then be synchronised and have a flyback (gate the laser off then), I'll look into G76 (I never worked on a CNC lathe, so I haven't used it yet), but I think I don't get the 'flyback' part. or use g33 By the way, can the starting angular position of the thread be specified in LinuxCNC? The machines here running LinuxCNC do not support rigid taping (no spindle feedback), so I never used G33.1. On Sinumeric controls it is possible to set the starting angle of the thread. or play with the gearing that can be used with hobbing, see http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing (add any logic to suit). The video link in the Wiki article is broken, I guess it refers to this video, if so I'll update the articel: https://www.youtube.com/watch?v=ZhICrb0Tbn4 See you Flo -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
On 22 April 2014 18:38, Florian Rist fr...@fs.tum.de wrote: By the way, can the starting angular position of the thread be specified in LinuxCNC? Not directly. For multi-start threads you offset the starting position. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
Hi Andy Not directly. For multi-start threads you offset the starting position. So two G33.1 calls at the same position and with the same parameters or a Z offset of an integer multiple of the pitch will cut the same thread. In a way the thread starts always at 0°. See you Flo -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Motion Synchronization to ext. trigger? (BeagleBone Back + Mesa 7I39, Machinekit?)
On 04/22/2014 12:20 PM, Florian Rist wrote: Hi Andy, thanks for you comments. Alternatively the Pico PWM brushless servo amp only needs a single channel of PWM: http://www.pico-systems.com/acservo.html Ah, I see that would make thinks much easier. You COULD, in theory, run it with just the Direction signal in synchronous antiphase mode, but this may cause the filter inductors (and maybe the motor, too) to run hot. Our servo amp was designed to run in sign-magnitude mode. That only takes TWO signals, PWM and Direction. Jon -- Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
