#linuxcnc | Logs for 2013-09-07

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[00:09:25] <andypugh> Anybody got a big lathe and needing a tool changer? http://www.ebay.co.uk/itm/Dorian-Smartdex-8-station-tool-post-tool-changer-Manual-or-CNC-lathe-99p-nr-/181211320420
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[01:42:25] <uw> wow thats a good price
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[01:43:12] <uw> id prolly try to turn that into a 4th axis for my mill
[01:43:41] <skunkworks> wow
[01:43:43] <skunkworks> http://www.practicalmachinist.com/vb/dmg-mori-seiki-gildemeister-maho-cnc/fix-your-maho-thread-270525/index3.html#post2111490
[01:43:59] <skunkworks> i guess I hear linuxcnc sucks....
[01:44:20] <uw> got a tldr for that thread post?
[01:52:50] <skunkworks> tldr?
[01:53:05] <Tom_itx> it's code
[01:53:13] <Tom_itx> you need a secret decoder ring to decipher it
[01:53:35] <uw> Top Less Dancer Rental
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[01:53:51] <skunkworks> heh - sorry - had to look it up. No - you just need to read it.
[01:53:53] <skunkworks> :)
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[02:02:39] <uw> mehh
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[02:06:18] <Tom_itx> seems he's raggin on everybody
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[02:11:51] <uw> I read the 4th paragraph because that had "LinuxCNC" in it. yea, it sounds like he was too dumb and/or lazy to figure out how to use it and it was more time-efficient to pay for some company's software.
[02:11:53] <uw> good for him
[02:15:29] <Tom_itx> what contouring doesn't lcnc do that others can?
[02:16:00] <Tom_itx> he said the mesa stuff had more io
[02:17:07] <Tom_itx> i think the focus of his bash was the camsoft and Galil card
[02:17:44] <Tom_itx> if he's looking for state of the art cad cam he's gonna pay state of the art prices as well
[02:17:56] <uw> beats me. I dont know what he was talking about but the overall theme was "I've done alot of internet reading and haven't really tried anything for myself and from that, i dont think I'm going to use linuxcnc"
[02:18:02] <Tom_itx> i bet he's not committed to that
[02:18:36] <Tom_itx> some ppl are doers and some are followers
[02:18:48] <uw> then you have the complainer
[02:19:02] <uw> and the moochers, who expect everything to be done for them
[02:19:44] <kwallace1> I think the problem is that 3D contour paths tend to be very short linear moves. LinuxCNC normally sees linear moves one at a time, or, accelerate from stop, travel, decelerate to stop. This goes very slowly, unless you tell LinuxCNC to merge the lines, which sacrifices accuracy.
[02:21:23] <kwallace1> For some people this is unacceptable due to very slow feed rate, or lack of accuracy.
[02:21:31] <uw> so i guess he wants a machine that can do 100parts/hr?
[02:21:56] <uw> welp i guess he can pay then
[02:22:40] <Tom_itx> how much deviation is experienced in reality with contouring on lcnc?
[02:23:01] <Tom_itx> you can expect some even in good quality cad cam generating cutter paths
[02:23:23] <Tom_itx> you can adjust it down but the files get alot bigger
[02:23:40] <kwallace1> I haven't study this, but it has been an issue for a long time, and sometimes heated.
[02:24:27] <Tom_itx> i can imagine
[02:25:21] <kwallace1> From my understanding, one can adjust the CAM to give longer lines, or create arcs. Or you can tell LinuxCNC to round the corners by an adjustable amount.
[02:27:01] <Tom_itx> generally, if i tell my cad cam to follow closer the lines are shorter and the file is considerably bigger
[02:27:16] <Tom_itx> we did alot of surface cutting
[02:27:21] <Tom_itx> aircraft stuff etc
[02:28:19] <kwallace1> A big issue has to do with how far in the motion que LinuxCNC can look ahead, some CNC controls have no problem with this.
[02:29:34] <Tom_itx> so it can predetermine the accel decel for the moves it would need a decent look ahead buffer
[02:30:09] <Tom_itx> i've seen machines chew thru a good size file very quickly but it was all sort contour line moves
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[02:33:31] <Tom_itx> i'm sure it's tough to arrive at a balance
[02:36:19] <Tom_itx> i wonder if the guy really knows if he needs that accurate of contouring or not or if he's just belly aching
[02:40:00] <kwallace1> I have no idea, and I have only been on the sidelines watching others duke it out.
[02:41:02] <Tom_itx> me either but i can see the concerns. i just wonder if the accuracy is demanded or if it's just that they think they need it
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[03:47:51] <someone972> Is there a resource for compiling LinuxCNC for Fedora?
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[05:01:23] <uw> someone972_, do you have to compile it? why not use the image or repos from a deb based disto
[05:02:28] <zultron> someone972_, I've got RPMs for el6.
[05:02:30] <someone972_> I'm building a very basic CNC machine that runs off of USB since I don't have access to a parallel port, so I was going to attempt to add basic support for it in LinuxCNC (for my own use)
[05:02:44] <zultron> fedora RPMs in the works.
[05:02:45] <someone972_> It's also so I can just mess around and make changes to help understand the code
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[05:03:09] <someone972_> I'm getting farther on compilation, now it's stuck on Boost::Python
[05:03:25] <zultron> Where you stuck?
[05:03:28] <someone972_> Apparently boost::python cant find pyconfig.h
[05:04:03] <someone972_> In file included from /usr/include/boost/python/detail/prefix.hpp:13:0, from /usr/include/boost/python/module.hpp:8, from conftest.cpp:44: /usr/include/boost/python/detail/wrap_python.hpp:50:23: fatal error: pyconfig.h: No such file or directory
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[05:05:25] <zultron> Hmm. Haven't run into that one.
[05:07:25] <zultron> Can you paste the entire gcc command line?
[05:08:07] <zultron> That looks pretty basic, since the file should be in /usr/include/python<version>.
[05:08:15] <zultron> someone972_, ^^^
[05:08:35] <someone972_> g++ -c -g -O2 -I/usr/include/python2.7 conftest.cpp >&5
[05:09:07] <zultron> Heh. And I assume /usr/include/python2.7/pyconfig.h exists.
[05:09:29] <someone972_> ah, it's pyconfig-64.h
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[05:11:46] <someone972_> Would making a symbolic link to it called pyconfig.h work do you think?
[05:12:19] <zultron> Doubtful. Hold on a sec.
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[05:13:51] <zultron> I've got a 64-bit fedora 19 install, but need to boot it up....
[05:14:14] <zultron> And it'll take a bit to get a dev environment installed. :P
[05:14:54] <someone972_> I'll be here all night, so if you really want to do that then go ahead :P
[05:15:04] <zultron> In el6 64-bit, pyconfig-64.h is in the same location.
[05:15:23] <zultron> You on 64 or 32 bit?
[05:16:00] <someone972_> 64
[05:16:12] <someone972_> In the pyconfig-64.h it has these as the first lines:
[05:16:26] <someone972_> Hmm, it's eating the comments
[05:16:37] <zultron> pastebin.ca
[05:16:37] <someone972_> pyconfig.h. Generated from pyconfig.h.in by configure. pyconfig.h.in. Generated from configure.in by autoheader.
[05:18:53] <someone972_> The only 64-bit-y things I can see is that longs are defined as 8 bytes
[05:19:47] <someone972_> By the way, does LinuxCNC compile as 64 bit?
[05:19:52] <zultron> This sounds like some kind of multilib problem. I'd guess even if you get past this one, you'll bump up against it again, since you haven't fixed the core problem.
[05:19:59] <zultron> Yes.
[05:20:33] <someone972_> I presume it would create a pyconfig.h if I installed the 32-bit version of python
[05:20:51] <zultron> It would, if that's possible.
[05:21:10] <zultron> Surprisingly, these header files are part of the base python package, not part of a -devel packae.
[05:21:14] <zultron> package
[05:21:44] <someone972_> Maybe I'll just try my luck with a symbolic link and see how far that gets me
[05:21:53] <someone972_> All that can happen is it fails again
[05:21:56] <zultron> Can't hurt.
[05:25:57] <someone972_> Now it says it can't find patchlevel.h
[05:26:22] <someone972_> Not sure what that belongs to
[05:26:24] <zultron> I thout that would happen.
[05:26:49] <zultron> Here's the BR list for el6. See if you have something similar installed.
[05:26:51] <zultron> http://pastebin.ca/2444840
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[05:27:45] <zultron> I'm guessing python-devel?
[05:28:06] <someone972_> You guessed right
[05:28:41] <zultron> Curious that they put that header in the base python pkg. I'm surprised more folks don't get confused.
[05:28:44] <zultron> https://bugzilla.redhat.com/show_bug.cgi?id=531901
[05:29:25] <someone972_> If config gets to the part where it has the block of #'s and tells you to run make, does that mean it completed successfully?
[05:29:38] <zultron> Yep.
[05:30:42] <zultron> RH-derivatives are new territory for LinuxCNC, though, so configure completing successfully isn't a guarantee that the build will succeed, too. :)
[05:31:06] <zultron> If you have any trouble, can you let me know? Fedora's my next target for building packages.
[05:31:18] <someone972_> I guess I'll find out soon, so far the build is working fine
[05:31:50] <zultron> Which version of LinuxCNC are you compiling?
[05:31:51] <someone972_> I'm doing the simulator btw, I figure I should try and get it to even compile before doing anything with realtime stuff
[05:32:00] <someone972_> Let me check
[05:32:26] <someone972_> 2.6.0 pre I think?
[05:32:26] <zultron> Where'd you download it? Tarball or git?
[05:32:29] <someone972_> git
[05:32:33] <zultron> Which branch?
[05:32:35] <zultron> Master?
[05:33:19] <someone972_> I used this command from the wiki: git clone git://git.linuxcnc.org/git/linuxcnc.git linuxcnc-dev
[05:33:26] <someone972_> For annonymous checkout
[05:33:35] <zultron> Ah ha, then you're compiling master.
[05:33:59] <zultron> If you want to run an RT kernel, you're going to have some trouble.
[05:34:11] <zultron> The master branch only supports the RTAI kernel.
[05:34:31] <someone972_> I'd actually prefer not to run a special kernel at all
[05:34:42] <zultron> And the only RTAI kernel RPM I've ever heard of is the one I wrote, and it doesn't work. :)
[05:34:49] <someone972_> Ha!
[05:35:26] <zultron> If you don't want to run a special kernel, you're not going to be able to use it for anything requiring real-time latency.
[05:35:53] <someone972_> I'm thinking that shouldn't be a problem for my simple little cnc that I built
[05:35:55] <zultron> There's a way around this if you're willing to relax that restriction.
[05:36:13] <someone972_> Most of the step generation is probably going to be done on the controller if I can get it to work
[05:36:59] <someone972_> Bugger, I wasn't paying attention to how to run linuxcnc after I built it
[05:37:19] <zultron> That'll help, but the rule of thumb passed around here says even the servo thread needs to keep latency within 100mS or so, and you won't get that without an RT kernel.
[05:37:44] <zultron> Try this: . ../scripts/rip-environment
[05:37:50] <zultron> then: linuxcnc
[05:38:12] <zultron> And to see how atrocious (or awesome) your latency is, try: latency-test
[05:39:07] <someone972_> it appears to be running
[05:39:12] <zultron> Congrats!
[05:39:13] <someone972_> Now to find this latency-test
[05:40:06] <someone972_> Oh dear, I spoke too soon
[05:40:14] <someone972_> The config screen popped up at least
[05:40:51] <zultron> Are you in Europe?
[05:40:55] <zultron> Bedtime here.
[05:41:37] <someone972_> I'm in mid-US
[05:41:39] <someone972_> http://pastebin.com/2TErzGfw
[05:41:51] <someone972_> Seen anything like that before?
[05:42:42] <zultron> Hrm, that's a new one, too....
[05:42:47] <someone972_> http://pastebin.com/LZ2betCq
[05:42:54] <someone972_> There's the debug if it helps
[05:46:01] <zultron> Problem is you're missing this module: hal_gm.so
[05:46:59] <zultron> Check your build log to see why it wasn't built, or do a 'find' to see if it's built but misplaced.
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[05:47:35] <zultron> No, maybe that's not it, hold on
[05:48:30] <zultron> You ran ./configure with --enable-simulator?
[05:48:39] <someone972_> ya
[05:49:17] <zultron> When I build the simulator, also no hal_gm.so, but I can fire up the axis gui, no problem.
[05:49:42] <zultron> I'm running universal-build-candidate-3, but that shouldn't make a differnce.
[05:51:46] <zultron> Which configuration did you select in the gui?
[05:52:14] <someone972_> I've tried My Configurations, 3-axis stepper, and stepper-mm
[05:52:18] <someone972_> and they all do the same thing
[05:52:18] <zultron> Look at hal/drivers/hal_gm.c. That's a rather obscure hardware interface.
[05:53:37] <zultron> configs/GM6-PCI/3-axis-stepper.hal tries to load that module.
[05:54:17] <someone972_> Ah, demo_sim_cl works
[05:54:36] <zultron> There y'are.
[05:57:33] <zultron> If you decide you need real-time later on, let me know. I'll have the whole thing packaged in the next couple of weeks for non-EOL Fedoras, including a couple of RT kernels.
[05:58:00] <zultron> RTAI is unlikely, though, so you'll have to run the universal-build-candidate-3 branch instead.
[05:58:07] <zultron> So I'm off to bed. Good luck.
[06:00:19] <someone972_> Thanks, you've really helped a lot
[06:00:23] <someone972_> http://postimg.org/image/q15d58u35/
[06:00:33] <someone972_> I don't know if that's horrible or not :P
[06:02:08] <someone972_> Looking at some of the other numbers people get, it looks pretty bad
[06:02:36] <zultron> np. Yes, that's horrible. Latencies of 1/4 second. You're shooting to get under 100 microseconds.
[06:03:34] <someone972_> Oh boy, I'm way off
[06:05:17] <someone972_> I guess I'll head out as well. Thanks again for all the help, I'm sure I'll be back at some point in the future :P
[06:05:18] <zultron> If you want to spend $45 and make the latency issues just go away, check this out: http://bb-lcnc.blogspot.com/p/machinekit_16.html
[06:05:42] <zultron> Ping me if you need help. I'm stoked there's finally another Fedora user around here. :)
[06:05:52] <zultron> Ciao
[06:05:59] <someone972_> Bye
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[06:22:09] <CaptHindsight> I use Fedora but not for Linuxcnc. I forgot how to package for SELinux
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[06:44:19] <DJ9DJ> moin
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[09:40:11] <kengu> any good photos of wood router dust collectors as i think i need to build or get one
[09:41:47] <kengu> http://woodworking.rockler.com/hardware/Router-Dust-Collector some kind of collar/hood as in some here
[09:42:18] <kengu> http://www.rockler.com/product.cfm?page=31892&site=ROCKLER or likes perhaps
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[09:42:38] <ReadError> i got one let me find the link
[09:42:56] <ReadError> http://www.kentcnc.net/nc/
[09:43:01] <ReadError> should be pretty easy to make
[09:43:11] <ReadError> couple magnets and the profile for the router
[09:43:55] <kengu> http://www.alibaba.com/product-gs/480073904/Dust_collector_Square_linear_guideway_CNC.html?s=p
[09:44:16] <kengu> ReadError: uu. that is good
[09:47:47] <ReadError> simple to make really
[09:48:26] <kengu> yeah. just need to laser some those acrylic parts and figure out a ..umm.. material for the brushes
[09:50:16] <kengu> ReadError: great. thanks for the tip.
[09:50:57] <kengu> that surface sensing tool did also look handy
[09:54:18] <kengu> just glue some paint brushes around the spindle (;
[09:56:01] <ReadError> you can buy that brush strip
[09:56:25] <kengu> aah.. brush strip
[09:56:31] <kengu> now i have a name for it
[09:56:53] <ReadError> i have no idea if thats what its called
[09:57:17] <kengu> it did help
[09:57:35] <kengu> ebay is full of things with brush strip
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[10:08:18] <kengu> http://www.jaseals.co.uk is one supplier
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[17:05:13] <IchGuckLive> hi all B)
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[17:15:23] <IchGuckLive> hi PetefromTn how is the weather in the USA
[17:16:12] <PetefromTn> Hey Ich, yeah it is a pretty damn beautiful day here today In East Tennessee. We are planning to have a bonfire out back tonight and roast some marshmallows..
[17:16:39] <IchGuckLive> its rainy and not nice here in germany
[17:17:37] <PetefromTn> Oh that sucks....been watching a tournament from Germany lately. They recently held the World Field Target Federation World Championships there. It was finished this past week.
[17:18:22] <IchGuckLive> tonigt the olympic 2020 is anounced
[17:18:27] <PetefromTn> http://www.ft-shooting.de/WM-FTS-2013/
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[17:22:40] <pcw_home> Itts hot here today, these last few day of heat have been the only real summer we've had
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[17:28:35] <IchGuckLive> someone has seen the lunar rocket live
[17:30:51] <PetefromTn> Too far away for me to see the launch. Have been there for several shuttle launches tho in the past.
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[17:34:15] <IchGuckLive> the lanch has been in virgina not at capside
[17:41:10] <IchGuckLive> ok im off by
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[20:06:28] <andypugh> I wonder how hard it would be to hack my lab PSU for More Power! Specifically a hgher voltage.
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[20:20:30] <Loetmichel> andypugh_ depends
[20:20:54] <Loetmichel> on some lab psus it is simply another Resostor in the "limiter" circuit
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[20:21:05] <Loetmichel> on some you have to switch the transformer
[20:21:27] <Loetmichel> and on some the transistors will blow at higher voltages
[20:21:38] <Loetmichel> ... all for linear supplys
[20:21:50] <Loetmichel> smps have another set of kinks ;-)
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[20:39:53] <andypugh> I just had a moderately random thought.
[20:40:50] <andypugh> My house knows when I am in. Or at least aspects of my house do. If my mobile phone is connected to my WiFi, then I am in. I wonder how hard it would be to make that change the heating thermostat setting?
[20:41:53] <kengu> not hard
[20:42:53] <andypugh> As things stand I would have to use linuxCNC and a servo to turn the knob, but I suspect there are cleverer ways if I replace elements of the heating system. :-)
[20:43:49] <andypugh> Great, I needed a new project. I only have about 40 years of projects stacked up at the moment.
[20:54:42] <Loetmichel> hrhr
[20:56:32] <Loetmichel> thats easy. buy these for all thermostat knobs: http://www.elv.de/elv-funk-elektronik-thermostat-eth-comfort200.html
[20:56:44] <Loetmichel> and use the phone directly to change the temperature
[20:57:29] <Loetmichel> tehre is even an "app" to lower the thermostat setting wehn leaving the house and loosing contact to the thermostats
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[21:49:52] <DJ9DJ> gn8
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[22:22:31] <Tom_itx> andypugh, how much more voltage do you need
[22:22:59] <andypugh> 50V would be nice, enough to wake up an 8i20, for example.
[22:25:20] <Tom_itx> how much current?
[22:25:48] <andypugh> 1A is probably enough.
[22:26:24] <andypugh> I do actually have something, but it is a slightly scary combination of a transformer with diodes on top and a capacitor. :-)
[22:26:47] <Tom_itx> voltage doubler?
[22:27:01] <andypugh> Not so easy with DC?
[22:28:00] <Tom_itx> i found a doubler chip but not for what you're looking for
[22:28:07] <Tom_itx> 5 to 12v
[22:28:25] <Tom_itx> not the usual 7660 one
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[22:29:26] <andypugh> I just found this: http://www.ebay.co.uk/itm/In-5-40V-Out-12-50V-Adjustable-DC-DC-Step-up-Converter-/140359290091
[22:29:39] <Tom_itx> boost converter would work
[22:29:52] <Tom_itx> if you can find one in the right range
[22:30:09] <andypugh> But it would be nicer if my existing bench PSU would just do it.
[22:30:54] <Tom_itx> stuff one of those inside
[22:31:05] <andypugh> There is a nice 60V 10A supply on eBay. But a bit more than I want to spend.
[22:31:22] <Tom_itx> i got a bunch of buck supplies for like a buck a piece
[22:31:27] <andypugh> I like the variable voltage and current limiting features.
[22:31:40] <Tom_itx> with 7seg led for around 5
[22:32:44] <Tom_itx> http://www.ebay.co.uk/itm/LM2596-LED-Voltage-Regulator-DC-Buck-Adjustable-Step-Down-Converter-Module-New-/400548207393?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item5d42889b21
[22:32:46] <Tom_itx> much like those
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[22:37:48] <andypugh> Those are pretty nice. Do they remember the setpoint between power-downs?
[22:38:31] <andypugh> One big 24V supply and an array of those would be quite a neat way to provide the voltages for a CNC controller.
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[22:39:32] <andypugh> Or are the buttons for changing what the dosplay shows, rather than the voltage setpoint?
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[22:41:12] <andypugh> I just bought 4, they are bound to come in handy :-)
[22:56:28] <Tom_itx> yeah they keep their setting
[22:56:34] <Tom_itx> pot adjustable
[22:57:06] <Tom_itx> the buttons activate the display and switch between input volts and output volts
[22:57:13] <Tom_itx> so you can turn the display off as well
[22:57:41] <Tom_itx> also got some without the display
[22:58:27] <Tom_itx> i used a fixed version on my mesa card in my psu
[22:59:04] <Tom_itx> http://tom-itx.dyndns.org:81/~webpage/misc_stuff/5v_switcher.jpg
[22:59:08] <Tom_itx> same chip
[22:59:18] <Tom_itx> only i can't build em for what you paid
[23:00:40] <Tom_itx> if used in a vibration environment, i'd put a dot of hot glue on the pot once set
[23:01:46] <Tom_itx> 25v max input iirc
[23:01:51] <Tom_itx> or thereabouts
[23:01:56] <Tom_itx> maybe a bit more
[23:02:15] <Tom_itx> that's why i used the centertap from one of my supply transformers for it
[23:03:29] <Tom_itx> the blue multiturn pot at the top is the adjuster on the ones you just got
[23:04:44] <Tom_itx> http://www.ebay.co.uk/itm/DC-Buck-Step-Down-Voltage-Adjustable-Converter-Power-Module-Regulator-LM2596-New-/161073415917?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item2580b946ed
[23:04:57] <Tom_itx> there's the one without the display
[23:05:00] <Tom_itx> i got some of both
[23:06:00] <andypugh> it costs me 5x as much as that just to post something to China. I have no idea how they can sell that cheaply and post for free.
[23:06:15] <Tom_itx> me either
[23:07:24] <Tom_itx> my part cost from digikey was around $10
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[23:08:49] <Tom_itx> http://www.ebay.co.uk/itm/120W-DC-Converter-Boost-Charger-Power-Supply-10-32V-to-35-60V-Step-Up-Regulator-/251214710705?pt=UK_Sound_Vision_Amplifier_Parts&hash=item3a7d9047b1
[23:08:57] <Tom_itx> similar, only boost instead of buck
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[23:11:44] <andypugh> Does anyone rely on encoder _counts_ going to zero on index or reset, rather than position?
[23:12:03] <andypugh> I know for a fact that bldc relies on the rawcounts _never_ being reset.
[23:12:19] <Tom_itx> i doubt it
[23:12:25] <andypugh> smart-serial encoders can't currently have two S32 pins...
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[23:13:01] <andypugh> So I need to choose between emulating "counts" and "rawcounts" and my first choice would be rawcounts
[23:13:12] <Tom_itx> http://www.ebay.co.uk/itm/10A-12V-80V-DC-DC-Boost-Converter-Power-Supply-500W-600W-Voltage-Regulator-/261209693854?pt=LH_DefaultDomain_3&hash=item3cd14f9e9e
[23:13:16] <Tom_itx> 10A !
[23:13:21] <Tom_itx> hard to believe for that cost
[23:13:42] <andypugh> Too hard :-)
[23:14:01] <Tom_itx> that would get you the volts you want
[23:14:38] <andypugh> I already bought: http://www.ebay.co.uk/itm/261239532385?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
[23:15:05] <andypugh> Perfectly OK for 8i20 and suchlike I think.
[23:15:08] <Tom_itx> yeah
[23:15:22] <Tom_itx> i doubt you need 10A for that
[23:15:42] <Tom_itx> that one is probably 2-3A
[23:15:48] <Tom_itx> didn't read the specs yet..
[23:17:35] <Tom_itx> pushing 50v would put the caps at their absolute limit
[23:19:09] <Tom_itx> i removed the input cap on my buck regulator because it was only 16v and the input was 25v
[23:19:15] <Tom_itx> added an external cap instead
[23:20:33] <andypugh> That big boy you found + transformer + input cap would be quite a nice lab PSU.
[23:20:41] <andypugh> I guess the one I got would, too.
[23:21:34] <andypugh> Move the caps to the back so the voltage display shows through the case, make the voltage control a remote knob, job done..
[23:21:39] <Tom_itx> just don't push the upper limit on yours unless you replace the cap
[23:23:17] <Tom_itx> it says output 5-55v which would exceed the cap rating :)
[23:25:21] <Tom_itx> that big one i found has current adjust as well
[23:25:39] <Tom_itx> read the silkscreen print on it
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[23:29:28] <andypugh> But £9.50 postage!
[23:30:02] <andypugh> I wil bear in mind the fact that it exists, though.
[23:30:47] <andypugh> There is probably a pretty decent stepper supply to be had there.
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[23:43:27] <Tom_itx> andypugh, you can get an interweb enabled thermostat
[23:43:35] <Tom_itx> then get an 'ap for that' for your phone
[23:44:22] <Tom_itx> our gas service offers them for free but we have to allow them to control them during peak hours
[23:45:06] <Tom_itx> 15min down time per given period or such.. i haven't signed up for one
[23:45:35] <andypugh> I probably would, I can see the wider-scale benefits.
[23:46:19] <Tom_itx> but with a wifi thermostat you could set it from anywhere