#linuxcnc | Logs for 2012-02-18

[02:26:21] <craynerd> Hi, has anyone any experience modding a pc powersupply as a cnc supply?
[02:27:11] <Jymmm> at more than 12V, no.
[02:28:26] <mrsun> buy a better powersupply with the voltage you want insted? :)
[02:28:42] <craynerd> I have one of these cheapo 6560 3 axis sets an I`m trying to source a cheap supply
[02:28:51] <craynerd> I know...I`m just being a tight arse!! :p
[02:29:10] <Jymmm> it's an UNregulated PS that you want.
[02:29:25] <Jymmm> xfmr + rectifier + caps
[02:29:36] <craynerd> unregulated...ok ! Will need to google that one...I`m a bit of a noob when it comes to cnc
[02:30:10] <Jymmm> just a transformer, bridge (or four diodes), and some big capacitors.
[02:30:17] <craynerd> I`ve setup a few steppers on a rotary table with a dedicated PIC to control it for dividing, but never a full system off a PC
[02:30:55] <craynerd> I`ve just used an 18v laptop power supply to run those when I make them for people
[02:31:32] <mrsun> craynerd, these regulated power supplies doesnt cost much realy =)
[02:31:55] <mrsun> Jymmm, is a unregulated better then a regulated for cnc applications? :)
[02:32:10] <Jymmm> mrsun: Yes, due to the BEMF
[02:32:29] <Jymmm> Reasd thispage in full will help understand the basics... http://www.geckodrive.com/ark-2/support.html
[02:32:31] <mrsun> and bemf is? :)
[02:32:37] <craynerd> OK... problem is, how do I know the total voltage and current needed? I believe over 24v and the tb6560 chips can easily blow desite their ratings
[02:32:40] <craynerd> back emf!! :D
[02:32:54] <Jymmm> Back EMF, which is produced when a motor slows/stops.
[02:32:54] <craynerd> I knew that one... :D not got a bloody clue what it means!!
[02:33:12] <craynerd> ahh!
[02:33:14] <mrsun> ahh =)
[02:33:26] <Jymmm> the motors PRODUCE electricity (in essense)
[02:33:27] <mrsun> hadnt seen that short for it before =)
[02:33:56] <Jymmm> just read that link
[02:34:00] <craynerd> ahhh! , so it is the emf produced BY the motor which then damages things!!#
[02:34:12] <Jymmm> READ
[02:34:28] <Jymmm> and damages nothing.
[02:35:31] <mrsun> oh well, the regulated one i have works fine atm so ill just kick it with that for now, expensive to upgrade to transformers =)
[02:36:31] <craynerd> to be honest Jymmm, call me a thick git but I`ve read the first few paragraphs an graph an it isn`t meaning much to me
[02:36:54] <mrsun> need to figure out how to remove the metal in the big hole ive done for the cabinett without a milling machine =)
[02:37:05] <craynerd> then again, I do have The Smurfs on an my three year old shouting in my ear hole.
[02:37:21] <mrsun> it SUCKS that i just rebuild, rebuild rebuild .... the mill was put together, working fine ... "oh lets make a new electronics enclosure *rip everything apart*" ...
[02:37:26] <Jymmm> craynerd: Just understnad what you can, and maybe read it a few times other days may help
[02:38:00] <Jymmm> craynerd: just skip other the confusing parts for now
[02:38:00] <craynerd> Will it also help about my power supply choice or just bemf understanding?
[02:38:07] <Jymmm> yes
[02:38:45] <Jymmm> No, I'm just fucking with you guys, it's all about scarry clowns!
[02:38:56] * Jymmm rolls eyes!
[02:39:13] <craynerd> ohhh yes!
[02:39:40] <craynerd> section 9 - Scary Clowns and their percetion by the Community
[02:41:06] <craynerd> Jymmm... I don`t like this.. I already have coulrophobia
[03:13:22] <craynerd> just another question, sorry
[03:13:44] <craynerd> just been to look at my motors and these are currently fitted: http://www.farnell.com/datasheets/51460.pdf
[03:14:35] <craynerd> they are only 5v!
[03:15:21] <craynerd> is this normal. like I said, the only stepper motors I`ve ever used, the drivers have been fed 18v from a laptop supply.
[03:16:09] <craynerd> talking balls...ignore me
[03:19:07] <craynerd> actually, will someone please talk to me for a second.
[03:19:11] <craynerd> I have one of these: http://www.mycncuk.com/forums/showthread.php/3753-TEP-educational-CNC-machine-using-TechCAD
[03:19:17] <craynerd> that isn`t my post..
[03:19:55] <craynerd> to run it, I`m using the original software called TECHCAD which is aweful. Imagine making the worst software you could, then double it!
[03:20:22] <craynerd> So first step is to get the two axis running off emc2,
[03:20:26] <craynerd> linuxcnc**
[03:21:10] <craynerd> could I utilise the powersupply from the original machine to run this? What would I need to see, voltage outut and is there any way of testing the max current?
[03:21:39] <craynerd> I`m just most concerned about this step of test power supply because I don`t want to blow anything!
[04:03:07] <archivist> craynerd, the stepper drivers control the current so dont worry about current
[04:04:42] <archivist> I would use the old supply in the old unit it is likely suitable
[04:30:30] <yoyo_> hi
[04:48:00] <Loetmichel> mornin'
[05:09:29] <archivist> craynerd, mjolinor who wrote that forum post lurks in here sometimes
[05:09:31] <archivist> !seen mjolinor
[05:09:32] <the_wench> last seen in 2012-02-14 22:15:49GMT 84:44:29 ago, saying Quit: Leaving
[05:12:47] <yoyo_> where can I find current documentation of api *VCP
[05:14:30] <jthornton> VCP as in Virtual Control Panel?
[05:14:47] <yoyo_> yes
[05:15:01] <yoyo_> pyVCP or gladeVCP
[05:15:31] <jthornton> the manual contains the current documentation
[05:16:02] <yoyo_> I'm trying from some time now to start with simple button. defeat
[05:16:18] <yoyo_> realy :) try to add something :)
[05:16:35] <jthornton> I don't understand
[05:17:11] <yoyo_> I'm trying to add simple button. and I'm defeat by that task.
[05:17:30] <jthornton> pyvcp or gladevcp?
[05:17:53] <yoyo_> pyvcp is including xml.dom.ext from python what is depricated
[05:18:18] <yoyo_> gladevcp is not pressent on my instance
[05:19:35] <jthornton> so I assume your not using a stock LiveCD install then
[05:20:01] * jthornton waits for more information
[05:20:02] <yoyo_> no :) I'm on gentoo
[05:20:46] <jthornton> good luck then
[05:20:57] <yoyo_> :)
[05:21:28] <yoyo_> as always. fight fight fight
[05:22:01] <jthornton> by your choice
[05:22:31] * archivist cannot understand the gentoo mentality
[05:22:38] <yoyo_> jthornton: I'm a c, php developer I'm not able to work on standard distro
[05:23:10] <archivist> c and php work just fine on my standard distro
[05:23:14] <jthornton> c and php works on my Ubuntu box
[05:23:51] * jthornton hears an echo in here LOL
[05:24:21] <yoyo_> bright :) try to build zenstudio on cross platform compiller
[05:25:02] <archivist> who needs zen studio! just use a normal editor
[05:26:06] <yoyo_> zen studio it is not only a editor :) it is a possibility to inject "C" code "lib" to your php engine
[05:26:19] <yoyo_> my target from work is not a x86 machines :)
[05:27:20] <yoyo_> bit it's my job. how the gladevcp ?
[05:31:32] <yoyo_> can someone direct me where is *.so with widgets for glade ?
[05:32:32] <jthornton> have you downloaded the source code?
[05:32:57] <yoyo_> jthornton: emc and glade
[05:37:14] <jthornton> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?GladeVcp
[05:37:26] <jthornton> http://www.linuxcnc.org/docs/2.5/html/gui/gladevcp.html
[05:38:52] <yoyo_> really I'm using linux 11 years now. asking questions on irc it's a last resort. I know RTFM
[05:40:14] <jthornton> I assume what your looking for is in the source code but I would have to 'find' it
[21:09:01] <cradek> joysticks, gamepads, mice, etc tend to be HID
[21:09:19] <Jymmm> One way commumincations is appears
[21:09:43] <cradek> HID is two-way, such as keyboards with lights
[21:09:52] <minibnz> jymm that could work...
[21:10:19] <Jymmm> cradek: But LED is minimal
[21:10:25] <cradek> A human interface device or HID is a type of computer device that interacts directly with, and most often takes input from, humans and may deliver output to humans. </wikipedia>
[21:10:30] <minibnz> cradek usb is master initiated (i think) the device can only respond to requests..
[21:10:50] <Jymmm> afk
[21:10:55] <minibnz> ie the pc asks the device if it has anything to say
[21:11:13] <minibnz> not that the usb device gets to shout it to the pc when ever it likes...
[21:11:38] <minibnz> via endpoints..
[21:12:23] <minibnz> but for what i want i think i should be able to work out a way to drive a tool changer
[21:12:46] <minibnz> i am happy to try and fail :)
[21:13:56] <cradek> nobody is saying you can't do it, but we are trying to give you ideas about how to do it simply and get it right the first time
[21:14:17] <cradek> we've seen so many new folks ask these kinds of questions, and go off their own direction, and be frustrated.
[21:14:52] <cradek> the advice is yours to do as you please with
[21:15:59] <cradek> for instance, some people think they want to make their own stepper drivers out of PICs or whatever. they are wrong that it's a good idea, but they try it anyway. then after much trouble, they either quit in frustration or buy real stepper drivers.
[21:21:05] <cal_> only to derail this conversation, on the topic of Stepper drivers. Is there an overlap of intelligence if using the compumotor S6 stepper drives with LinuxCNC?
[21:21:11] <minibnz> oh i totally hear what you are saying, this is why i bought a controller/driver that supported the most number of axis that i could find.... i think if i change my toolchanger design a little i can make it only consume one axis and not take up too much of my bed travel, until i get around to upgrading the bed :)
[21:22:13] <cradek> cal_: dunno - what kind of interface do they use?
[21:25:07] <cal_> Step and Direction
[21:27:43] <cal_> I have not been able to tell if they "shift" from micro stepping to full steps at speed
[21:29:18] <cal_> The timing requirements are mentioned in the emc compatible driver information
[23:05:54] <jbunch_> Just for fun on a bridgeport series 1 mill what are the upside and downside of using a servo motor for the spindle?
[23:09:59] <jbunch_> 2 to 3 kw I am already using EMC.