Re: [Emc-users] A round toit generator
On 4/16/2014 11:13 PM, Gene Heskett wrote: On Thursday 17 April 2014 01:05:29 Gregg Eshelman did opine: On 4/16/2014 7:35 AM, Gene Heskett wrote: I am waiting for an LP bracket for the 5i25. Full height bracket + bench vise + hammer + Dremel + cutoff wheel = low profile bracket. :) True, and of coarse I have all that but whats the proper height of the bolt down L bend? I've checked the wikipedia articles, and they do not note that height for either std or lp. Googled low profile pci card bracket dimensions and first hit is... PCI Mechanical Working Group ECN Low Profile PCI Card http://www.pcisig.com/specifications/conventional/conventional_pci/lowp_ecn.pdf See Figures 5-XX through 5-XX for low profile PCI expansion card physical dimensions. -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] A round toit generator
On Wed, 16 Apr 2014 19:03:23 -0400, you wrote: On Wednesday 16 April 2014 18:56:52 jeremy youngs did opine: gene, ive been ogling one of jon elsons servo controllers for my treadmill motored mill . but alas i want to do that upgrade after the 1000 $ to ship the mill to home in missouri. it seems almost purpose made for the application. i have been waiting to get the mill there as i have been building solar panels and i think that it would be pretty cool to make chips from sun power and there is not near as much sun here in upstate mew york . Modern panels are designed to work in daylight and don't need full Sunlight. Now that sounds like a cool project. Post pix of the array storage, and the mill as work proceeds. I've not bit the bullet for any solar yet, but ready kilowatt has gone on strike for 19 days at a time several times over the last 6 years, so I did put in a 20kw nat gas generator last fall. Might go solar if it ever gets down to a penny a watt, but thats not going to happen as long as Obummer is messing with it, and locally (WV) we have no rule about selling power back to the utils either. They would rather burn coal make more acid rain. They drastically reduced the sell back rate over here too! It's now 6.61p/kWh - was as high as 15 - 40p plus depending on when installed and how much supplied. Break even point is roughly 12 years over here for a domestic installation. We'd rather import Polish coal and Russian gas and burn that (even though we have plenty of our own untapped/mined) and stick up those noisy, inefficient, eyesore wind turbine bird killers. Steve Blackmore -- -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Configurations
I have created a component for led-dimming: https://github.com/strahlex/TCT3D/blob/master/comp/led_dim.comp Would be nice to have it in Machinekit for some demo projects. Am Dienstag, 15. April 2014 17:07:09 UTC+2 schrieb Charles Steinkuehler: I am getting close to having the next major version of the BeagleBone uSD card image ready. I have some pending configurations to add (for my CRAMPS board and the Xylotex BBB_DB25), and am working on removing the absolute paths. If there are any new boards, standard machine configurations, or other changes you'd like to see included in the new images, please let me know. -- Charles Steinkuehler cha...@steinkuehler.net javascript: -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Crucible furnace [Was: A round toit generator]
On 16.04.14 08:48, Kirk Wallace wrote: I think pushing your home-made furnace up the list might be a good idea. Then you know who to call when it doesn't work :). I did this: http://www.wallacecompany.com/machine_shop/Furnace/ Very nice crucible handling tools, Kirk. (They put mine to shame.) It's a shock to realise that it's nearly four decades since I built a crucible furnace with firebricks (two-brick by half a dozen courses cavity), using a mix of local clay and sand for fireproof mortar. (As described in an old steam engineer's handbook) The lid is a firebrick slab. The grate was just coarse pebbles on a perforated steel sheet, one course from the bottom, with a 12v car ventilation fan blowing in under that, through a piece of rectangular steel downpipe inserted in a gap left in the first brick course. The PWM speed controller used a 555 and power transistor to bring things down to a dull roar. OK, there were a few bangs inside, as a couple of pebbles fragmented during the first gentle burn, but all was quiet after that. Fuelled with coke, it melted steel, and on one occasion I made some aluminium bronze castings, cooking up the bronze from scrap aluminium, some half inch electrical cable cut up with an axe, and some tiny brads for the iron content. (Didn't have swarf in those days) The Al-bronze seemed to be chill cast, because a big angle grinder skated off without taking much of a bite, when I started fettling. But mostly it was used for aluminium casting, fuelled with charcoal, which was to hand, since the furnace stands on the edge of 2 sq km of hardwood forest. A little bit of Cu and a little Zn made the castings age hardening. If I'd had waste oil to burn, then an oil fuelled design would have appealed, but instead I still have nearly 2 cu m of charcoal for if my energy levels should again lead to a fit of melting. Better make some better crucible tools first, though. Erik -- The northeast coast of Tasmania is a climate-change hotspot. There's been a sea surface temperature monitor on Maria island for 30 years and in that time the sea has warmed 4°C [bringing] the long-spined sea urchin, which was first seen around Flinders Island in the late 70s. - Dave Allen, in Weekly Times 02.04.14. -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] A round toit generator
On Thursday 17 April 2014 06:22:07 Gregg Eshelman did opine: On 4/16/2014 11:13 PM, Gene Heskett wrote: On Thursday 17 April 2014 01:05:29 Gregg Eshelman did opine: On 4/16/2014 7:35 AM, Gene Heskett wrote: I am waiting for an LP bracket for the 5i25. Full height bracket + bench vise + hammer + Dremel + cutoff wheel = low profile bracket. :) True, and of coarse I have all that but whats the proper height of the bolt down L bend? I've checked the wikipedia articles, and they do not note that height for either std or lp. Googled low profile pci card bracket dimensions and first hit is... PCI Mechanical Working Group ECN Low Profile PCI Card http://www.pcisig.com/specifications/conventional/conventional_pci/lowp_ ecn.pdf See Figures 5-XX through 5-XX for low profile PCI expansion card physical dimensions. I did the same, but skipped the pdf's, figuring it would be in the wiki, my bad.. That is almost exactly what I'm looking for. Thanks Gregg. 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 -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] A round toit generator
On Thursday 17 April 2014 06:28:32 Steve Blackmore did opine: On Wed, 16 Apr 2014 19:03:23 -0400, you wrote: On Wednesday 16 April 2014 18:56:52 jeremy youngs did opine: gene, ive been ogling one of jon elsons servo controllers for my treadmill motored mill . but alas i want to do that upgrade after the 1000 $ to ship the mill to home in missouri. it seems almost purpose made for the application. i have been waiting to get the mill there as i have been building solar panels and i think that it would be pretty cool to make chips from sun power and there is not near as much sun here in upstate mew york . Modern panels are designed to work in daylight and don't need full Sunlight. Now that sounds like a cool project. Post pix of the array storage, and the mill as work proceeds. I've not bit the bullet for any solar yet, but ready kilowatt has gone on strike for 19 days at a time several times over the last 6 years, so I did put in a 20kw nat gas generator last fall. Might go solar if it ever gets down to a penny a watt, but thats not going to happen as long as Obummer is messing with it, and locally (WV) we have no rule about selling power back to the utils either. They would rather burn coal make more acid rain. They drastically reduced the sell back rate over here too! It's now 6.61p/kWh - was as high as 15 - 40p plus depending on when installed and how much supplied. Break even point is roughly 12 years over here for a domestic installation. We can't touch that over here. Lawmakers all bought paid for by the utilities. We'd rather import Polish coal and Russian gas and burn that (even though we have plenty of our own untapped/mined) and stick up those noisy, inefficient, eyesore wind turbine bird killers. Steve Blackmore -- 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 -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Brake resistor question
Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. Experienced guy suggested braking resistor with 100-150 ohm resistance. But how do I determine correct rated power? Or is it that I just take the biggest power available as it cannot be too high? Viesturs -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Brake resistor question
On 04/17/2014 06:56 AM, Viesturs Lācis wrote: Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. Experienced guy suggested braking resistor with 100-150 ohm resistance. But how do I determine correct rated power? Or is it that I just take the biggest power available as it cannot be too high? Viesturs Some VFD manuals have sections covering braking resistors. Some resistor modules have sensors or protection devices of some type. The Ohms and voltage values will set the current going through the resistor. V = I * R or V / R = I, let's say 240V / 100 Ohms = 2.4 Amps. Watts = V * I or 240 * 2.4 Amps = 576 Watts. If you go higher in Ohms, you will get less braking. The VFD's braking circuit will likely have a maximum current rating as well as the motor. One of my shop-made braking modules (four gold colored resistors) is bolted to the back of my VFD here: http://www.wallacecompany.com/cnc_lathe/HNC/00024-1a.jpg -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Brake resistor question
Hi , Viesturs. I found this documenthttp://www.cressall.com/brakingresistors/downloads/Calculating%20brake%20resistance.pdfthat may be useful . I do believe that 100W should be ok for a 500W motor . Of course the calculation is related to the energy that have to be dissipated during the braking phase. So also acc/dec time can influence too. Alex On Thu, Apr 17, 2014 at 4:25 PM, Kirk Wallace kwall...@wallacecompany.comwrote: On 04/17/2014 06:56 AM, Viesturs Lācis wrote: Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. Experienced guy suggested braking resistor with 100-150 ohm resistance. But how do I determine correct rated power? Or is it that I just take the biggest power available as it cannot be too high? Viesturs Some VFD manuals have sections covering braking resistors. Some resistor modules have sensors or protection devices of some type. The Ohms and voltage values will set the current going through the resistor. V = I * R or V / R = I, let's say 240V / 100 Ohms = 2.4 Amps. Watts = V * I or 240 * 2.4 Amps = 576 Watts. If you go higher in Ohms, you will get less braking. The VFD's braking circuit will likely have a maximum current rating as well as the motor. One of my shop-made braking modules (four gold colored resistors) is bolted to the back of my VFD here: http://www.wallacecompany.com/cnc_lathe/HNC/00024-1a.jpg -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Brake resistor question
Haas uses electric stove elements. I suppose they had an engineer sit down for 10 minutes to figure out the resistance. They will certainly take a significant amount of wattage On Thu, Apr 17, 2014 at 9:56 AM, Viesturs Lācis viesturs.la...@gmail.comwrote: Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. Experienced guy suggested braking resistor with 100-150 ohm resistance. But how do I determine correct rated power? Or is it that I just take the biggest power available as it cannot be too high? Viesturs -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Brake resistor question
On 04/17/2014 07:25 AM, Kirk Wallace wrote: On 04/17/2014 06:56 AM, Viesturs Lācis wrote: Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. Experienced guy suggested braking resistor with 100-150 ohm resistance. But how do I determine correct rated power? Or is it that I just take the biggest power available as it cannot be too high? Viesturs Some VFD manuals have sections covering braking resistors. Some resistor modules have sensors or protection devices of some type. The Ohms and voltage values will set the current going through the resistor. V = I * R or V / R = I, let's say 240V / 100 Ohms = 2.4 Amps. Watts = V * I or 240 * 2.4 Amps = 576 Watts. If you go higher in Ohms, you will get less braking. The VFD's braking circuit will likely have a maximum current rating as well as the motor. One of my shop-made braking modules (four gold colored resistors) is bolted to the back of my VFD here: http://www.wallacecompany.com/cnc_lathe/HNC/00024-1a.jpg Another thing that comes to mind, without a braking resistor, you essentially have a resistor of very high Ohms. When you call for braking the motor turns into a generator and the generated voltage goes into the VFD's braking circuit which at this point presents no load, so the voltage goes too high. If you configure the VFD settings to slow down over a longer time, less voltage goes to the braking circuit and you can avoid the over voltage alarm. If you want faster braking, set the VFD to a shorter braking time, but also add some braking load by reducing the braking resistance. Since we are starting with nearly infinite Ohms, any reduction will help quite a bit. You can reduce Ohms and braking time up until the current limit of the braking circuit and motor. Once you have the Ohms value, you can calculate the Watt rating for the resistor. If the resistor gets hot, increase the braking time or add a heat sink. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Brake resistor question
On Thursday 17 April 2014 11:32:36 Viesturs Lācis did opine: Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. Experienced guy suggested braking resistor with 100-150 ohm resistance. But how do I determine correct rated power? Or is it that I just take the biggest power available as it cannot be too high? The latter here. I am using much lower R's than that, and there would be a limit to how many strokes I can use for a g33.1 on my lathe. But its more than a single usage to tap a hole would need. My resistors are 6 of the 20 watt 8 ohm power r's from the shack, and do get warm. The high speed set (I stage them with a wcomp module) loads a 1hp treadmill motor with a 2x2 network, giving 8 ohms 80 watts, sandwiched between some alu angle, then as the speed dies it drop to 4 ohms at 40 watts air cooled, with the last stage being a dead short from about 125 spindle revs to stopped. Two reasons for the application staging, 1. don't exceed the motors nameplate or circuit breaker amps for fear of damaging the PM field magnets, and 2. Don't unscrew the fan/pulley from the motor shaft. It is loctite'd in place and screwed on much tighter than factory, but since its 3 or 4 lbs of iron, could rip up things in the box very easily should it come loose. Viesturs -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ 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 -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Brake resistor question
On Thursday 17 April 2014 11:56:00 Eric Keller did opine: Haas uses electric stove elements. I suppose they had an engineer sit down for 10 minutes to figure out the resistance. They will certainly take a significant amount of wattage Along those same lines, replacement water heater elements could be used in those higher voltage environs. The mica sheets wound with the flat nichrome from old bread toasters might also be a suitable source. Shield those from swarf obviously. Ditto for old electric clothes dryers. On Thu, Apr 17, 2014 at 9:56 AM, Viesturs Lؤپcis viesturs.la...@gmail.comwrote: Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. Experienced guy suggested braking resistor with 100-150 ohm resistance. But how do I determine correct rated power? Or is it that I just take the biggest power available as it cannot be too high? Viesturs -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ 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 -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Brake resistor question
On 04/17/2014 08:56 AM, Viesturs Lācis wrote: Hello! I have three chinese servo drives in the waterjet machine and they are constantly faulting with overvoltage error. Since I have not yet added any braking resistors, it seems obvious that I should do so. The question is: how do I determine appropriate resistance and rated power values for the resistor? Motor parameters are here: http://www.cutting.lv/fileadmin/user_upload/tg-motor.pdf Currently max current in motors is set to 1,4A, which makes me think that actual motor power is 500W. 560 V at 1.4 A is a reasonable guess. That would be 400 Ohms. A 100 W vitreous ceramic resistor works well, they take momentary overloads easily. You could probably go a little lower on the resistance without trouble. But, it is unlikely the motors will generate much more than their continuous rating while being decelerated. Jon Jon -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] 2.5.4 is released!
No config changes are required when upgrading from 2.5.x to 2.5.4. For the typical installation, the update manager will automatically offer you this upgrade. Otherwise, you can get the packages from http://linuxcnc.org/dists Many thanks to the people who have reported bugs, and especially to the folks who worked to improve LinuxCNC for this release: Alex Joni Andy Pugh Ben Jackson Chris Morley Chris Radek Chris S Morley Dewey Garrett Francis Tisserant Frank Tkalcevic Jeff Epler John Thornton Jon Elson Michael Haberler Russell Brown Sebastian Kuzminsky Here are the changes: * Build: update dependencies for Debian 7 * Docs: many fixes and updates * HAL: blend: fix docs to match the real behavior * HAL: edge: fix incorrect edge trigger at startup: Bug #346 * HAL: ilowpass: handle encoder counter overflows properly * HAL: lcd: fix formatting when no format length is specified * HAL: new components bin2gray, gray2bin for Gray code conversion * HAL: new components bitwise and bitslice, for bitwise math operations * HAL: pcl720: fix in-not pins * HAL: thc: fix incorrect calculation of velocity tolerance: Bug #348 * Hostmot2: document ability to have multiple 7i43 cards * Hostmot2: fix for PCI transfers on Linux 3.x kernels * Hostmot2: fix resolver index emulation/detection * Hostmot2: fix resolver total brokenness on 64-bit builds * Interpreter: fix crash when returning from a subroutine, to a file that has been deleted: Bug #357 * Interpreter: fix VW-plane (G19.1) canned cycles * NGCGUI: Always apply tool offset when loading a tool * NGCGUI: Fix qpocket stepover, ramping for mm users * NML: fix remote clients talking to linuxcncserver * Pncconf: allow setting the number of classicladder bits and words * Pncconf: fix configurations requesting gladevcp panels without spindle speed displays * Pncconf: fix 7i43 address designation: Bug #358 * Pncconf: fix 5i25+prob_rfx2 pin numbering problem: Bug #331 * Pncconf: fix testing of smart-serial based spindles * Pncconf: place STEPGEN_MAXVEL/STEPGEN_MAXACCEL values in the ini * PPMC: Add new sample config showing encoder velocity estimation * PyVCP: in a spinbox, allow entering a value with Return: Bug #364 * Stepconf: better defaults for axis-test distances * Stepconf: fix spindle-at-speed connection * Task: fix several problems with M61 (set currently-loaded tool) * Touchy: MDI support for M61 Q * Touchy: MDI support for multi-turn arcs * TP: fix a minor acceleration constraint violation in some arcs -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] G70, G71, G72 Lathe profile cycles
For the TL;DR bunch, my question - when implementing these, should they have smarts in them to prevent gouging or overloading the tool? Or is it assumed that the operator/programmer is smart enough not to try something dangerous? Detailed question. I want to implement these as wizards. I see there is already work done here (http://linuxcnc.org/index.php/english/forum/40-subroutines-and-ngcgui/11414 -metric-lathe-subroutines-g71-g72-etc-etc) so I'll probably borrow from that. My question is related to what should the cycles do, if anything, when there is potential tool gouging, or excessive loading of the tool. There is a great picture of what I'm talking about here (http://www.linuxcnc.org/index.php/english/forum/20-g-code/27040-g71-g70-cyc le-for-lathes-first-tests). In the picture at the bottom, if that was really the lathe tool being used, it would gouge the work piece as it hit the 90 degree shoulder at the left (both in roughing passes, and finishing). I've read Shmid and he says that if there is a 90 degree shoulder, the cycles will only rough up to the final surface and will not cut that face on a finishing pass. So I can implement that and rely on the operator to select the correct tool. What about things like the arcs - in the left most arc, as the tool moves left during a finishing pass, it will be taking heavier cuts if multiple finishing passes are a fixed offset from final profile. Should I be taking into account the amount of material that is being removed? Do fanuc and haas cycles do this? This will complicate the configuration by needed to know the tool geometry. Frank -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] G70, G71, G72 Lathe profile cycles
I'm grappling with G71 and G72 Fanuc cycles this very minute, and would love to be able to examine the source code implementing those :-). A plain vanilla upper-right quadrant OD turning profile isn't too hard to figure out, but I'm trying to machine a upper-left quadrant profile with a cutoff tool and G72, and having all kinds of trouble getting it to move the way I want. I'm sure you can make a LinuxCNC version that works better and in a more straightforward manner than Fanuc. -- Ralph From: Frank Tkalcevic [fr...@franksworkshop.com.au] Sent: Thursday, April 17, 2014 5:34 PM To: Enhanced Machine Controller (EMC) Subject: [Emc-users] G70, G71, G72 Lathe profile cycles For the TL;DR bunch, my question - when implementing these, should they have smarts in them to prevent gouging or overloading the tool? Or is it assumed that the operator/programmer is smart enough not to try something dangerous? Detailed question. I want to implement these as wizards. I see there is already work done here (http://linuxcnc.org/index.php/english/forum/40-subroutines-and-ngcgui/11414 -metric-lathe-subroutines-g71-g72-etc-etc) so I'll probably borrow from that. My question is related to what should the cycles do, if anything, when there is potential tool gouging, or excessive loading of the tool. There is a great picture of what I'm talking about here (http://www.linuxcnc.org/index.php/english/forum/20-g-code/27040-g71-g70-cyc le-for-lathes-first-tests). In the picture at the bottom, if that was really the lathe tool being used, it would gouge the work piece as it hit the 90 degree shoulder at the left (both in roughing passes, and finishing). I've read Shmid and he says that if there is a 90 degree shoulder, the cycles will only rough up to the final surface and will not cut that face on a finishing pass. So I can implement that and rely on the operator to select the correct tool. What about things like the arcs - in the left most arc, as the tool moves left during a finishing pass, it will be taking heavier cuts if multiple finishing passes are a fixed offset from final profile. Should I be taking into account the amount of material that is being removed? Do fanuc and haas cycles do this? This will complicate the configuration by needed to know the tool geometry. Frank -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 2.5.4 is released!
On 04/17/2014 05:55 PM, Chris Radek wrote: * HAL: ilowpass: handle encoder counter overflows properly Oh, wow! I never even thought of this, and it would take a LOT of cranking on the MPG to cause this, but if used in other places I suppose it could cause real mayhem! Good catch! Jon -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Announcing LinuxCNC 2.6.0-pre1
I am pleased to announce LinuxCNC 2.6.0-pre1. This is the first in a series of pre-releases intended to shake out bugs, in preparation for the next stable release of LinuxCNC. If you are currently running LinuxCNC 2.5, you will not get automatically upgraded to 2.6. If you want to stay on 2.5, no action is needed. LinuxCNC 2.6 is available for Ubuntu 10.04 Lucid and Ubuntu 12.04 Precise. LinuxCNC 2.6 is not available for Ubuntu 8.04 Hardy. To upgrade an existing LinuxCNC 2.5 install on Lucid or Precise, see the instructions on the wiki: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?UpdatingTo2.6 If you use a Mesa 7i64 or a Mesa 8i20, pay special attention to the Changes to your configuration section, as some HAL configuration has changed. That wiki page also contains instructions for making a fresh install of LinuxCNC 2.6 on Ubuntu 12.04 Precise. New features since LinuxCNC 2.5: * reorganized sample configs to improve clarity * .ini files now support a '#INCLUDE' directive * GUI: Axis: allow feed rate override display to go up to % * GUI: Axis: XYUV foam cutter support * GUI: touchy: wheel scrolling of program start point * GUI: add new gmoccapy gui * GUI: add new gscreen gui * gladevcp: lots of new widgets * HAL: halcmd now supports tilde expansion * HAL: halscope now shows the first derivative of probe channels * HAL: stepgen now supports 16 channels (up from 8 in 2.5) * HAL: gs2 VFD driver now supports configurable acceleration and deceleration, and has support for a braking resistor * HAL: halui now switches to manual mode automatically when the user requests jogging * HAL: new drivers: * VFS11 VFD * Delta VFD-B * General Mechatronics 6 axis motion control card * xhc-hb04 USB jog pendant * HAL: new components: * mux_generic: generic multiplexer * lincurve: linearization curve lookup table * matrix_kb: matrix keyboard driver * mb2hal: generic Modbus-to-HAL interface * orient: works with M19 to control spindle position * sim-encoder: simulate an encoder, for useful for testing * thcud: torch height control for plasma * Hostmot2: add support for 5i24 AnyIO board * Hostmot2: add support for buffered SPI * Hostmot2: add support for the Mesa 7i65 (bspi 8xServo) * Hostmot2: add support for uarts * Hostmot2: add support for serial encoders (ssi, biss, and fanuc) * Hostmot2: add support for table-mode stepgens * Hostmot2: add support for DPLL * Hostmot2: detect report encoder quadrature error * Hostmot2: improved support for encoders (configurable filter rate) * Hostmot2: improved support for muxed encoders (configurable skew rate) * interp: G-codes can now be remapped * interp: added read-only named parameters (#_x etc) * interp: added M19 (orient spindle) and an orient component * interp: added python subroutines * motion: coolant and lube are now user-controllable at all times * motion: rapid velocity now ignores feed override setting * removed freqgen component, it's been replaced by stepgen's velocity mode Many thanks to everyone who tested and contributed bug reports during the 2.6 development cycle, and to the folks who contributed improvements to the docs and code: Alex Joni Anders Wallin Andy Pugh Bence Kovacs Ben Jackson Chris Morley Chris Radek Dewey Garrett Eric Johnson Erkka Koski Francis Tisserant Frederic Rible Janos Bujtar Jeff Epler Jofey Jian John Kasunich John Thornton Jon Elson Kim Kirwan k.t. chan Les Newell Matt Shaver Michael Geszkiewicz Michael Haberler Norbert Schechner Peter Blodow Russell Brown Sebastian Kuzminsky Victor Rocco Yishin Li -- Sebastian Kuzminsky -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
