#linuxcnc | Logs for 2013-07-25

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[00:06:05] <RyanS> But why do businesses sell them.... because they are probably pretty worn out
[00:10:13] <CaptHindsight> RyanS: I got one on ebay 3 years ago for $900 made in 1961 than is still pretty tight
[00:13:26] <RyanS> The market is much bigger in the US that's why you can get a all these bargains
[00:18:26] <WalterN> work is over yay
[00:30:27] <CaptHindsight> the US has lost manufacturers over the past 30 years, so there's lots of old machines
[00:31:11] <jesseg> Howdy Folks. Could someone perhaps be so kind as to direct me to the definitive tutorial on setting up LinuxCNC for 4 linear axis - for the beginner? Thanks!
[00:50:02] <uw> the internet
[00:52:37] <NickParker> i'd love to see a tutorial if it exists
[00:52:39] <NickParker> but i doubt it does
[00:52:44] <jesseg> haha =)
[00:52:46] <NickParker> seems like there's a TON of variation in setups
[00:52:59] <jesseg> yeah.
[00:58:46] <CaptHindsight> how are the 4 axes arranged?
[00:58:47] <uw> i was thinking of making a youtube of it
[01:00:02] <jesseg> I'm getting geared up to do 3D printing - so I need the 4th axis to be another linear axis which maps to inches of feedstock filament
[01:00:41] <CaptHindsight> jesseg: have you checked out the work with the BBB for the glue gun printers?
[01:00:42] <NickParker> you should jump on #reprap
[01:01:09] <NickParker> are you trying to print with some huge milling machine?
[01:01:13] <NickParker> it'll likely be aggravatingly slow.
[01:01:21] <CaptHindsight> http://www.youtube.com/watch?v=AK_OYoNOBDQ
[01:01:23] <Tecan> (AK_OYoNOBDQ) "BeagleBone Black + BeBoPr + LinuxCNC = machinekit" by "Charles Steinkuehler" is "Tech" - Length: 0:12:02
[01:02:04] <CaptHindsight> glue gun printers are all slow, it's not a rapid 3D print tech
[01:02:29] <NickParker> i'm sitting between 2 atm
[01:02:39] <NickParker> the one on my left is flying along at 120 mm/s
[01:02:45] <jesseg> CaptHindsight, no I haven't heard of the glue gun printers. NickParker: reprap I know. It just makes G codes. It wants 4 linear axis. LinuxCNC's stepconf wizard only has options for 3 linear and 1 angular for a 4 axis mill. It's a small sherline mill :)
[01:03:17] <NickParker> what machine are you trying to print with?
[01:03:30] <CaptHindsight> jesseg: FDM, FFF = GGG
[01:03:53] <jesseg> NickParker, a small sherline mill.
[01:04:10] <jesseg> But never mind that I'm printing. 4 linear axis is just 4 linear axis :-)
[01:04:27] <jesseg> CaptHindsight, hmm. I don't know the meaning BBB, FDM, FFF, or GGG.
[01:05:17] <NickParker> do you know the max XY speed of your mill?
[01:05:17] <CaptHindsight> jesseg: what controls are you using?
[01:05:46] <jesseg> You mean the PCB that controls the DC encoder motors using PID, and accepting step and direction via the printer port?
[01:06:02] <CaptHindsight> jesseg: yes
[01:06:25] <CaptHindsight> jesseg: is it supported by linuxcnc?
[01:06:51] <jesseg> CaptHindsight, one I designed and built myself using PIC chips and international rectifier half-bridge drivers and mosfets. It supports my own RS232 protocol as well as standard sherline step and direction.
[01:06:59] <jesseg> Yes. Supported as step and direction, 4 axis.
[01:07:16] <jesseg> The first 3 axis work great with LinuxCNC =)
[01:08:33] <CaptHindsight> jesseg: did you see the youtube ^^
[01:08:58] <jesseg> watching now.. :)
[01:09:22] <jesseg> oh, BBB is beebopper board?
[01:09:45] <jesseg> oh wait. the beagle bone black.
[01:09:45] <CaptHindsight> beagle bone black = BBB
[01:10:39] <CaptHindsight> not sure what G-codes they use for the extruder
[01:10:40] <jesseg> I guess I could get used to these acronyms. I did some non-cnc experimentation with a RPR
[01:11:28] <jesseg> CaptHindsight, E I think. Just another linear axis. a goto 1.00 moves the extruder input filament 1mm or whatever
[01:12:05] <NickParker> yep
[01:12:15] <NickParker> reprap gcode just has an extra axis named E
[01:12:15] <CaptHindsight> fused deposition modeling = FFF = free form fabrication = FDM (trademarked) = glorified glue guns
[01:12:16] <jesseg> what's the beboper?
[01:12:22] <NickParker> it's included in the move commands
[01:12:40] <jesseg> ahh. and RPR is Raspberry Pi Red?
[01:12:47] <CaptHindsight> http://circuitco.com/support/index.php?title=BeBoPr_Cape
[01:12:56] <jesseg> thanks
[01:12:57] <NickParker> G1 X116.08 Y113.31 E22.06606
[01:12:57] <NickParker> G1 X113.31 Y116.08 E22.16859
[01:13:03] <NickParker> ^^some reprap gcode i'm running atm
[01:13:09] <jesseg> hehe yup
[01:14:05] <NickParker> have you got linuxcnc accepting slic3r or cura gcode?
[01:14:15] <jesseg> yeah! (Slic3r)
[01:14:53] <NickParker> nice. imo you may want cura working too. It's better for ideal machines.
[01:14:57] <NickParker> slic3r is more forgiving when it comes to compensating for issues with the hardware
[01:15:10] <NickParker> but cura has nicer features for machines that don't have issues
[01:15:26] <jesseg> I hadn't heard of cura. Just getting into this.
[01:15:47] <NickParker> cura is the software that ships with ultimaker premade printers, but it's free online as well.
[01:15:59] <jesseg> windows only?
[01:16:32] <NickParker> it might be..
[01:16:47] <NickParker> dunno let me go chec
[01:16:47] <NickParker> k
[01:16:47] <NickParker> http://wiki.ultimaker.com/Cura
[01:16:47] <NickParker> linux
[01:16:47] <NickParker> and mac
[01:16:53] <jesseg> hey NickParker, any chance you might be so kind as to share your LinuxCNC .ini file that depicts how your E axis is configured? :)
[01:17:08] <NickParker> heh. my 3d printers run on arduino based boards
[01:17:14] <NickParker> gcode interpretation done on the microcontroller
[01:17:22] <NickParker> i don't have linuxcnc anything running yet.
[01:17:25] <jesseg> oh :P not even linuxCNC :)
[01:18:15] <CaptHindsight> https://github.com/cdsteinkuehler/LinuxCNC-RepRap
[01:18:55] <NickParker> if your custom controller takes non-differential step/dir it would be pretty easy to drive it by an arduino mega instead of a whole linuxcnc setup
[01:20:16] <jesseg> NickParker, Non-differential? It's just plain old fashioned 5V logic and works with a PC printer port.
[01:20:28] <NickParker> non-differential as in shared logic ground
[01:20:39] <NickParker> a lot of stepper drivers have step+ step- dir+ dir -
[01:20:40] <jesseg> oh, differential meaning like LVDS :P
[01:20:54] <jesseg> no this is plain 5v logic.
[01:21:11] <NickParker> yeah i would look into installing marlin firmware on an arduino mega and driving your board with that
[01:21:45] <jesseg> Well, I already have the PC all set up with LinuxCNC.. and I'm on a budget.. but I'll definitely keep that in mind!
[01:26:10] <jesseg> On thephone...
[01:44:52] <CaptHindsight> WalterN: Analog + - 5V is the input on the driver boards
[01:45:10] <WalterN> oh ok
[01:47:47] <WalterN> CaptHindsight: so what mesa board do I need for them?
[01:55:33] <NickParker> jesseg: an arduino mega is $22 on amazon with prime
[01:55:39] <NickParker> $30 or so otherwise
[01:55:44] * jesseg no prime
[01:57:25] <CaptHindsight> WalterN: 6i25 is PCIe and has 3V PWM + can be expanded via daughter cards to drive stepper and servos plus other IO
[01:59:00] <CaptHindsight> it depends on what else you are going to drive and control
[01:59:32] <WalterN> just the stepper (or servo) for Z I guess
[02:20:35] <CaptHindsight> WalterN: 6i25 and maybe https://www.sparkfun.com/products/8745 to buffer STEP and DIR, unless your stepper driver can input 3V
[02:22:57] <CaptHindsight> now we just need to convert 3V PWM to + - 5V for the galvo driver inputs
[02:24:06] <jesseg> off phone
[02:25:50] <WalterN> hmm
[02:27:51] <jesseg> Night folks. Thanks again!
[02:30:31] <WalterN> so $110 for the 6i25
[02:33:14] <mrsun> hmm threads, say a 1.5mm pitch thread on M16, would that be stronger then a 0.75mm pitch thread M16? :)
[02:36:30] <CaptHindsight> WalterN: I'll try to find a DAC or PWM filter board off the shelf, it's easy enough to build
[02:37:13] <WalterN> if I have schematics, I could make it myself... but I need good schematics... lol
[02:39:20] <CaptHindsight> http://store.makerbot.com/pwm-driver-v1-1.html maybe
[02:43:31] <NickParker> it'd be nice, and potentially wise to avoid makerbot anything
[02:43:48] <NickParker> i dunno how they could mess up a simple PWM board, but i wouldn't put it past them
[02:52:13] <WalterN> CaptHindsight: looking at the "daughtercards"
[02:52:28] <WalterN> and I'm a little confused :-x
[03:00:53] <WalterN> oh, those are only breakout boards?
[03:01:37] <WalterN> as in... not really necessary?
[03:01:58] <DJ9DJ> moin
[03:02:56] <WalterN> CaptHindsight: seems the 6i25 has a power selector option for 5volt
[03:03:15] <WalterN> oh no
[03:03:20] <WalterN> just power supply?
[03:03:24] <WalterN> meh, I donno
[03:15:06] <WalterN> CaptHindsight: the 7i77 maybe?
[03:25:54] <NickParker> 5i25 and 6i25 both output 5v
[03:25:59] <NickParker> according to http://www.mesanet.com/fpgacardinfo.html
[03:26:07] <WalterN> oh ok
[03:28:10] <WalterN> herm
[03:51:13] <WalterN> NickParker: do I really need a breakout board for the 6i25 for the 5v analog signal?
[04:03:17] <WalterN> NickParker: "Note that even though the 6I25 can tolerate 5V signal inputs, its outputs will not swing to 5V."
[04:03:40] <WalterN> thats on page 17
[05:25:12] <RyanS> Holy crap why do linishers have like 3 kW motors even if not particularly large ?
[05:27:24] <syyl> because you can bog it down with ease...
[05:27:49] <syyl> push a bit to hard and it comes to a stop
[05:28:50] <syyl> we had a 0.75kW one, that was more like a toy
[06:36:56] <jthornton> anyone ever blacken stainless?
[06:42:46] <skunkworks> http://imagebin.org/index.php?mode=image&id=265571
[06:43:08] <skunkworks> spindle motor
[07:08:02] <Tom_itx> jthornton, http://www.epi.com/c/black-oxide?gclid=CJKwwcDKyrgCFUxo7AodnREA5Q
[07:08:08] <Tom_itx> and http://bbs.homeshopmachinist.net/threads/46812-Blackening-Stainless-Steel
[07:08:11] <Tom_itx> but no i haven't
[07:09:22] <jthornton> I have the EPi black oxide kit at the other shop lol and we use it on mild steel
[07:10:34] <jthornton> it is the cold oxide kit and does not do well on hard steel
[07:11:11] <Tom_itx> http://www.epi.com/c/black-oxide/stainless-steel
[07:11:13] <Tom_itx> that one?
[07:11:56] <jthornton> this one http://www.epi.com/c/black-oxide/steel/room-temperature-black-oxide
[07:12:00] <jthornton> is what we have now
[07:13:45] <jthornton> lol I'll order the sample kit and it will be enough to do all my screw heads
[07:14:05] <Tom_itx> you can't just order black screws?
[07:14:55] <jthornton> M6-1 x 20 Torx is what I need but can't find them so I have to use socket head
[07:15:30] <Tom_itx> http://www.fastener-express.com/black-oxide-fasteners.aspx
[07:18:29] <Tom_itx> they appear to hav torx
[07:18:49] <jthornton> they don't have M6 button head socket cap screws :(
[07:19:01] <Tom_itx> yeah i haven't found em either
[07:19:40] <jthornton> going to be a good morning for a bike ride in the woods
[08:22:44] <spack> mcmaster has 'em
[08:22:53] <spack> oh, torx
[08:22:54] <spack> ick
[08:22:56] <spack> nevermind
[08:23:01] <spack> why torx!?!
[08:23:21] <spack> you make me a sad man :(
[08:25:11] <spack> mcmaster has m6-1 30 torx button head cap 12mm long
[08:25:16] * spack shivers
[09:35:24] <JT-Shop> spack: m6 torx at mcmaster are taptite screws
[09:35:44] <JT-Shop> torx because the rest of the spyder uses torx
[10:08:14] <DJ9DJ> moin
[10:17:40] * WalterN yawns
[10:18:08] <CaptHindsight> http://www.tamperproof.com/products/m6-x-10-x-20-button-hd-torx-security-ms.html but these have the extra pin
[10:20:32] <WalterN> CaptHindsight: oh... so.. do I need a breakout (daughter) board for the 6i25?
[10:35:02] <skunkworks> logger[mah],
[10:35:02] <logger[mah]> skunkworks: Log stored at http://linuxcnc.mah.priv.at/irc/%23linuxcnc/2013-07-25.html
[10:37:26] <CaptHindsight> WalterN: yes, for PWM 3V to +-5V analog and also to buffer STEP and DIR for a stepper
[10:40:08] <WalterN> CaptHindsight: so I need the 7i77 then? thats the only one I saw that is analog
[10:40:53] <pcw_home> If you can use PWM use PWM (assuming you have frequency specs)
[10:41:45] <WalterN> pcw_home: evidently the galvos I have need 5v analog
[10:43:11] <CaptHindsight> pcw_home: his galvo driver board is +- 5V analog in
[10:50:07] <CaptHindsight> http://www.use-enco.com/1/1/5283-set-granite-steel-inspection-surface-plate-stands-640-1960.html the stand and plate combo is $1 less than the stand alone!?
[10:50:29] <CaptHindsight> http://www.use-enco.com/CGI/INSRIT?PMAKA=640-1020&PMPXNO=2603667&PARTPG=INLMK3
[10:51:08] <Connor> Check the grade of the surface plate.
[10:51:14] <Connor> and Shars has some pretty good pricing on them too.
[10:51:27] <CaptHindsight> B grade
[10:51:45] <CaptHindsight> was just at Shars yesterday
[10:53:25] <CaptHindsight> http://www.use-enco.com/CGI/INSRIT?PMAKA=640-0160&PMPXNO=952668&PARTPG=INLMK3 the plate alone sells for more than the combo
[10:54:02] <Connor> were is the link to the combo
[10:54:04] <CaptHindsight> super clearance or pricing error
[10:54:32] <CaptHindsight> http://www.use-enco.com/1/1/5283-set-granite-steel-inspection-surface-plate-stands-640-1960.html
[10:54:58] <CaptHindsight> Includes: 640-0160 Surface Plate; 640-1020 Stand
[10:55:10] <Connor> who knows...
[10:56:10] <CaptHindsight> + 20% off
[10:56:42] <CaptHindsight> Use Code 2DAYSALE
[10:59:24] <Connor> how did you find the combo ?
[11:00:10] <CaptHindsight> the 20% works for the machines as well, list $6598 new total $4751
[11:01:13] <CaptHindsight> catalog search
[11:03:07] <CaptHindsight> Connor: http://www.use-enco.com/CGI/INPDFF?PMPAGE=418&PARTPG=INLMK3&PMITEM=640-1960
[11:03:41] <CaptHindsight> $35 less than the 18 x 24 combo
[11:03:59] <Connor> I just want a 12 x 18
[11:04:07] <Connor> small shop.
[11:05:06] <CaptHindsight> I also use them for machine bases
[11:10:26] <CaptHindsight> aerotech or newport would charge 10x for similar
[11:12:37] <WalterN> oh, I'd need something to control the laser with too
[11:20:22] <WalterN> CaptHindsight: http://www.o-like.com/index.php?main_page=product_info&cPath=8&products_id=92
[11:33:54] <spack> JT-Shop: never heard of that before.. the mcmaster entry doesn't say anything about weird threads...
[11:35:05] <JT-Shop> it's a common thread for soft materials... and the M6 x20 torx screws at mcmaster are taptite threads not machine threads
[11:37:59] <spack> JT-Shop: you know that from experience, or is there a way to see which mcmaster bolts are taptite?
[11:38:21] <JT-Shop> yes, and the description says it is taptite
[11:39:02] <spack> weird, i'm not seeing that
[11:39:18] <JT-Shop> Thread-Forming Screws for Soft Metals
[11:39:26] <JT-Shop> The triangular shank presses tightly as it forms threads, so screws resist loosening in soft metals such as brass, aluminum, and copper. Also known as Taptite® screws, they have a pan head with a flat bearing surface, a Torx drive, and a blunt tip. Length is measured from under the head.
[11:39:32] <JT-Shop> http://www.mcmaster.com/#metric-torx-screws/=nryscr
[11:40:08] <spack> ah, i'm looking at different ones
[11:40:13] <spack> Metric Torx Drive Alloy Steel Button Head
[11:41:27] <spack> http://www.mcmaster.com/#socket-head-cap-screws/=nrypig
[11:41:33] <spack> weird that yours didn't come up in my search
[11:41:58] <JT-Shop> my mistake they are M5 x 20 not M6
[12:13:39] <IchGuckLive> hi all
[12:20:01] <DJ9DJ> hi livegucker
[12:21:19] <WalterN> for that liquid plastic, is there an upper limit on laser power that should be used?
[12:21:25] <WalterN> for curing
[12:21:43] <jdh> keep it under 1.76 jiggawatts
[12:23:56] <archivist> use some common sense, rtfm, do not rely on some random internet guy
[12:24:16] <archivist> e&oe
[12:24:47] <IchGuckLive> DJ9DJ: wetter is perfect no rain and supper hot
[12:25:15] <IchGuckLive> i wory if the plasma can stand this weekend on full motion
[12:35:43] <DJ9DJ> kann ich auch was von der suppe haben, bitte ;)
[12:36:44] <DJ9DJ> the extreme heat begins to suck. we had a thunderstorm in the afternoon, but its already to warm again :/
[12:38:24] <WalterN> I got the black leather dye for anodizing
[12:39:57] <CaptHindsight> WalterN: yes, you want to initiate polymerization not burn or vaporize the photopolymer
[12:40:28] <CaptHindsight> but you're not using anything hat powerful or parking the beam over one spot for that long
[12:40:38] <WalterN> CaptHindsight: wouldent a higher power laser just mean that the layer could be scanned faster?
[12:40:54] <CaptHindsight> yes
[12:40:58] <WalterN> ok
[12:43:41] <WalterN> I think I'm going to get that $110 laser
[12:45:17] <spack> just buy a shark that comes with a laser
[12:45:40] <WalterN> screw sharks
[12:45:58] <CaptHindsight> WalterN: but you only have a 20kpps galvo
[12:46:19] <WalterN> is that not fast enough?
[12:46:39] <CaptHindsight> that's one of your limitations for speed
[12:46:47] <WalterN> oh, yeah
[12:52:48] <CaptHindsight> LiveCD install last night on Phenom_II quadcore in a Gigabyte GA-MA785GM-US2H, latency jitter <7k
[12:56:47] <IchGuckLive> CaptHindsight: on what tread usb in out ?
[12:57:56] <CaptHindsight> it's in the other room, whatever the standard default setting are for both in the latency test
[12:59:31] * WalterN flails
[13:11:37] <WalterN> CaptHindsight: so the 6i25 and the 7i77? it seems the 7i77 will output 5v analog
[13:13:20] <CaptHindsight> WalterN: that is one option
[13:14:18] <WalterN> CaptHindsight: is there a better option?
[13:15:15] <CaptHindsight> requires no soldering
[13:15:40] <WalterN> almost seems like overkill... heh
[13:17:23] <CaptHindsight> maybe PPT and sound card
[13:17:29] <Tom_itx> JT-Shop, be sure to pack a torx wrench with all your kits like all good chinese companies do :)
[13:18:00] <JT-Shop> the spyder comes with a torx driver as all the fasteners on it are torx
[13:18:48] <WalterN> CaptHindsight: though, for both the 7i77 and the 6i25 its $260... that does not seem too bad
[13:19:15] <WalterN> how would interfacing that with linuxCNC work?
[13:19:40] <CaptHindsight> I'll have to chat about it with you later
[13:20:28] <CaptHindsight> go spend a few days anodizing :)
[13:20:39] <WalterN> heh
[13:20:55] <WalterN> how much acid do I want to add to the water for that?
[13:21:33] <WalterN> sulfuric acid
[13:21:49] <JT-Shop> do you anodize?
[13:22:03] <WalterN> donno, I'll find out once I try it
[13:22:23] <JT-Shop> I'm setting up a 10 gallon line
[13:22:48] <WalterN> I got a gallon of black dye to try out
[13:22:57] <WalterN> and purple
[13:23:00] <JT-Shop> black is the hardest to do
[13:23:28] <WalterN> oh good
[13:23:29] <JT-Shop> are you using the LCD method?
[13:23:32] <CaptHindsight> JT-Shop: it's much easier if you use solvent dye
[13:23:50] <WalterN> oh it is? cause I got solvent black dye... lol
[13:24:06] <WalterN> the purple stuff I got is water based
[13:24:23] <JT-Shop> I thought all anodize dyes were water based
[13:24:37] <CaptHindsight> JT-Shop: dye bath types are
[13:25:06] <WalterN> you dont submerse the part in solvent dye?
[13:26:40] <CaptHindsight> you can, but traditional anodize uses a water dye bath for type-II color anodize
[13:27:19] <WalterN> I was going to wait till the weekend to try out anodizing
[13:27:46] <JT-Shop> CaptHindsight: do you have a working anodizing line?
[13:27:56] <WalterN> and I dont leave for work for another 2 hours
[13:28:08] <CaptHindsight> solvent dye won't wash out during sealing, plus the solvent tends to flow well into the pores
[13:28:23] <WalterN> because its thinner
[13:28:27] <WalterN> nice
[13:28:38] <IchGuckLive> im off by
[13:28:46] <Tom_itx> buy
[13:28:56] <WalterN> bi
[13:29:17] <WalterN> JT-Shop: how does linuxCNC interface with the mesa 6i25?
[13:29:34] <JT-Shop> I don't have one
[13:29:56] <CaptHindsight> JT-Shop: I work in R&D for anodizing at times, mostly work on inks, coatings and printers
[13:30:14] <JT-Shop> ok, I was just wondering
[13:31:01] <JT-Shop> WalterN: are you using the LCD method?
[13:31:10] <WalterN> what is LCD?
[13:31:26] <JT-Shop> low current density
[13:31:36] <WalterN> oh... probably?
[13:31:37] <CaptHindsight> JT-Shop: the pores in the anodic film before sealing will hold anything you can get in them
[13:32:20] <JT-Shop> WalterN: what do you have?
[13:32:37] <WalterN> I have a nice constant current power supply...
[13:32:53] <WalterN> and a few gallons of battery acid... heh
[13:34:04] <JT-Shop> what volts and current is the power supply?
[13:34:13] <WalterN> uh
[13:34:28] <WalterN> 30volts, 50 amps if I recall correctly
[13:34:52] <JT-Shop> that's a nice one
[13:34:52] <WalterN> can be either constant current or constant voltage
[13:35:07] <JT-Shop> http://support.caswellplating.com/index.php?/Knowledgebase/Article/View/91/19/lcd-anodizing-instructions
[13:35:12] <JT-Shop> have you read that?
[13:35:14] <WalterN> when in constant current mode it has an overvoltage thing
[13:36:06] <WalterN> JT-Shop: no I havent... looks like something I should print off
[13:36:08] <JT-Shop> bbl
[13:36:21] <JT-Shop> that outlines the LCD method
[13:36:40] <WalterN> will magnesium anodize like aluminum?
[13:37:31] <Tom_itx> i don't think so but i'm not entirely sure
[13:37:42] <Tom_itx> i know some aluminum works better than other
[13:39:55] <WalterN> hmm
[13:40:24] <WalterN> do I need aluminum wire/plates for the cathode/anode? or will stainless steel work?
[13:41:45] <WalterN> either 304 or 316
[15:54:08] <spack> WalterN: http://en.wikipedia.org/wiki/Anodizing#Anodized_magnesium
[16:14:38] <DJ9DJ> gn8
[16:33:57] <spack> at what point should i worry about my steppers getting hot?
[16:34:09] * spack grabs a thermocouple
[16:39:09] <spack> looks like they're running at 70C or so right now and they're at rest
[17:27:23] <Tom_itx> spack, they run hotter at rest
[17:27:39] <Tom_itx> and they _do_ run warm
[17:29:47] <Tom_itx> some drivers cut current when idle
[17:31:53] <spack> i just measured them all
[17:32:00] <spack> they're all running at about 70C
[17:32:10] <spack> one axis is at rest
[17:32:17] <spack> one is moving back and forth pretty constantly
[17:32:33] <spack> seems like they're rated up to about 80C or so in general...?
[17:32:38] <spack> couldn't find any specs on these
[17:32:53] <Tom_itx> they run hot to the touch
[17:33:38] <spack> yeah, i know running hot is normal, i'm just wondering how hot is too hot
[17:33:55] <Tom_itx> it will let you know
[17:34:08] <spack> by melting down?
[17:34:10] <spack> lol
[17:34:13] <Tom_itx> :)
[17:34:44] <spack> no more decisive way to test the performance limits of a piece of equipment than watching it blow up
[18:28:58] <WalterN> derping on break time at work
[18:29:23] <JT-Shop> anodizing yet?
[18:29:41] <WalterN> no, I was going to save that for the weekend
[18:29:55] <WalterN> ..or perhaps later...
[18:30:07] <JT-Shop> got a plan yet?
[18:30:24] <WalterN> yeah, do stuff until I dont have to do stuff anymore
[18:30:43] <JT-Shop> I want to see some photos of the stuff
[18:31:00] <WalterN> at the moment, all I have are bar ends and stuff
[18:31:28] <JT-Shop> matters not one whit, only the finish and color
[18:31:32] <WalterN> oh, I need the purple dye too...
[18:32:54] <WalterN> I dont have the purple water based dye yet
[18:33:20] <JT-Shop> red and blue
[18:33:27] <WalterN> dont have those either
[18:33:39] <WalterN> just black alcohol based dye
[18:35:13] <JT-Shop> I ordered an acid pump today
[18:35:26] <kwallace2> Isn't it cheaper to just send parts out to be anodized?
[18:36:01] <JT-Shop> if they can do what you want and if you have someone near possibly
[18:36:26] <JT-Shop> small runs are usually too expensive to send out
[18:39:05] <kwallace2> Lot size matters when sending out anodized parts?
[18:39:43] <JT-Shop> it matters with any thing you hire someone to do
[18:41:09] <kwallace2> My thinking is that there is no tooling, so the cost per part would be similar for 20 or 200.
[18:42:20] <JT-Shop> your forgetting the racks
[18:42:34] <JT-Shop> that is anodizing tooling
[18:43:48] <JT-Shop> and run size makes a difference for any manufacturing process, the longer you run the the faster and better you get
[18:44:06] <kwallace2> I'm thinking the tooling is a piece of hook shaped wire, but I could be way off base.
[18:44:19] <JT-Shop> Ti racks
[18:45:10] <JT-Shop> if you hang a part on a hook you will have problems maintaining the electrical connection to the part
[18:45:46] <kwallace2> That makes sense.
[18:45:51] <JT-Shop> you can use 1100 wire but you must have a part that can provide a solid electrical connection
[18:46:17] <JT-Shop> can you tell I've been studing for the test
[18:46:27] <JT-Shop> studying
[18:48:47] <kwallace2> I would like to make some telescope parts which need to be black. I briefly looked at an anodizing kit but the cost drove me away. I'm considering powder paint now, but that could change the part dimensions too much.
[18:49:11] <JT-Shop> what material?
[18:50:25] <JT-Shop> you can mask the threads when you PC a part
[18:53:15] <kwallace2> Whichever machinable aluminum fits the application the best. A black plastic might be better. I'm not sure I'll ever have time to get to this, but I waste some time now and then thinking about it.
[18:53:48] <JT-Shop> 6061 takes anodizing the best
[18:53:58] <JT-Shop> black delrin might be an option
[18:54:03] <JT-Shop> what does the part look like
[18:55:23] <kwallace2> Focusers, eyepieces, camera mounts.
[18:56:14] <JT-Shop> 6061 seems better for those parts
[18:56:53] <kwallace2> If I can get someone to anodize them ;)
[18:57:09] <JT-Shop> shortly you can send them to me
[18:57:50] <JT-Shop> a tip, anodizing does not hide defects
[18:58:25] <NickParker> he probably just wants that classic black camera body look
[18:58:35] <NickParker> also, black matte finishes aid optics
[18:58:42] <NickParker> no stray reflection and all
[18:59:03] <kwallace2> Uh oh, the ball is my court now. I got a bunch of lenses form Surplus Center to make eyepieces about a year ago.
[18:59:03] <JT-Shop> matte can be done in the etch tank
[18:59:16] <JT-Shop> yep, tag your it
[18:59:46] <kwallace2> How about a tumble finish?
[19:00:03] <JT-Shop> you can do that too
[19:00:16] <kwallace2> or light sand blast.
[19:00:21] <JT-Shop> vibratory finishers are common to use
[19:00:39] <JT-Shop> sand blast might not be so nice
[19:01:03] <WalterN> JT-Shop: why would you need an acid pump?
[19:01:08] <kwallace2> Okay, I try a little harder to get something done.
[19:03:15] <JT-Shop> WalterN: you have to keep the acid moving to keep hot spots from forming on the part other wise you can burn the part
[19:04:19] <WalterN> oh yeah
[19:04:38] <JT-Shop> I'm pedalling as fast as I can to get my anodizing line up and running..
[19:04:49] <WalterN> the method I saw the guy used the shop air and just blew bubbles in it
[19:05:15] <JT-Shop> that works ok for the LCD method but you need to do it outside
[19:05:52] <JT-Shop> keep the ASF to 6 for a 3-1 mix of battery acid to distilled water
[19:06:57] <WalterN> ASF?
[19:07:14] <JT-Shop> Amps per Square Foot of surface area
[19:07:22] <WalterN> also, do you have a link to the pump you bought?
[19:07:26] <JT-Shop> you have to calculate it for each part
[19:07:46] <JT-Shop> it's $250 do you still want the link?
[19:07:52] <WalterN> I think most sump pumps are sealed plastic
[19:08:19] <JT-Shop> the shafts fail in the acit
[19:08:20] <JT-Shop> acid
[19:08:41] <WalterN> how many gallons/minute is it rated at?
[19:08:51] * JT-Shop cranks the music up so I can hear it with ear plugs in
[19:09:07] <JT-Shop> aww I forget
[19:10:39] <JT-Shop> http://www.zorotools.com/g/00055663/k-G1927922/
[19:11:16] <WalterN> fudge, just broke a drill
[19:11:17] <JT-Shop> Magnetic Drive Pump, Power Rating 1/25 HP, Voltage @ 60 Hz 115, Current Rating 1.3 Amps, Outlet 1/2 Inch MPT, Inlet 1/2 Inch FPT, Maximum PSI 7.1, Maximum Head 16.3 Feet, Motor Enclosure TEFC, Maximum Temperature 200 F @ 0 PSI, 135 F @ 30 PSI, Water Flow @ 3 Feet of Head 9.1 GPM, @ 6 Feet of Head 8.2 GPM, @ 9 Feet of Head 6.5 GPM, @ 15 Feet of Head 2.5 GPM, Height 5 Inches, Length 10 Inches, Width 4 Inches
[19:11:17] <JT-Shop> Temp (F) @ 10 PSIG : 200, Impeller : Ryton, Max. Specific Gravity : 1.1, Max. Viscosity : 100 SSU, Mounting : Horizontal, Bearings : Thrust, Design : Gravity-feed, Requires the Pump Inlet to be Lower than Liquid Level, Application : For Highly Corrosive Chemicals, Eliminates Seal-caused Friction Loss, Wear, Contamination and Leakage
[19:12:08] * JT-Shop tosses off the machinist hat and picks up the chef hat
[19:12:11] <WalterN> only 9?
[19:12:22] <WalterN> that seems pretty slow
[19:12:41] <JT-Shop> well it is not a 1000 liter ano tank
[19:23:26] <CaptHindsight> http://nstrmnt.com/#/suspended-depositions/
[20:03:41] * WalterN flails
[20:05:07] <WalterN> JT-Shop: oh hey, thats a little giant pump?
[20:05:11] <WalterN> those are good stuff
[20:05:44] <WalterN> JT-Shop: where did you buy it?
[20:20:15] <WalterN> oh derp
[21:11:29] <jesseg> Howdy Folks
[21:24:15] <skunkworks> jesseg: how is it going?
[21:31:06] <jesseg> good! How're you gettin' along?
[21:33:29] <skunkworks> ok - no major complaints
[21:34:39] <jesseg> You ever done 4 linear axis with LinuxCNC?
[21:35:59] <skunkworks> are we talking a hot wire machine?
[21:38:35] <jesseg> I don't care what the 4th axis is. I'm just getting started with LinuxCNC and I have a 4-axis sherline type printer port step and direction controller PCB which controls 4 brush type DC optical encoder motors..
[21:39:14] <jesseg> And the stepconf wizard has XYZA - but A is an angular axis.. I want to have 4 linear type axis calibrated all to inches or mm (but not degrees.)
[21:39:15] <CaptHindsight> XYZ + extruder as 4th IIRC
[21:39:38] <jesseg> Right, but how to set up 4th axis as linear is my question =)
[21:39:54] <jesseg> I may be able to just copy the axis_2 section to axis_3
[21:40:08] <Tom_itx> just change the ini to linear instead of angular for the axis
[21:40:15] <jesseg> oh is that all?
[21:40:24] <Tom_itx> well and the units
[21:40:37] <Tom_itx> it might be easier to copy the axis section from another one
[21:41:11] <jesseg> I notice that in stepconf wizard, there is steps/turn, and turns/inch, and microstepping options and everything. In the .INI file, there is just a single scale= parameter as far as setting scale..
[21:41:27] <Tom_itx> i've never used the wizard
[21:42:21] <pcw_home> stepconf just calculates the scale based on your input parameters
[21:43:17] <jesseg> true
[21:43:43] <jesseg> but when you go open the ini file again via stepconf, it remembers all those different parameters... even though they are not recorded in the INI file
[21:46:31] <jdh> there is another stepconf file
[22:00:13] <CaptHindsight> jesseg: which extruder are you using?
[22:11:11] <jesseg> CaptHindsight, It *was* this one: http://www.ebay.com/itm/New-0-4mm-Nozzle-Extruder-Print-Head-for-3D-Printer-free-shipping-W-tracking-/321110804409
[22:11:22] <jesseg> but it's been since modified to have a brush type DC encoder motor on it :D
[22:12:36] <CaptHindsight> finally someone with a closed loop extruder
[22:12:45] <jesseg> LOL... yeah...
[22:12:52] <jesseg> well.
[22:12:54] <jesseg> almost.
[22:13:14] <jesseg> if the drive wheel gear thing slips on the filament, then it's open loop haha
[22:13:29] <jesseg> by slips I mean "grinds a low spot and fails to gain traction"
[22:14:51] <jesseg> I kind of strongly dislike open loop
[22:15:00] <CaptHindsight> so the encoder is on the same gear that pulls the filament
[22:15:10] <jesseg> The encoder is on the back of the motor.
[22:15:30] <CaptHindsight> so if it does slip, it won't indicate that
[22:15:43] <jesseg> Ideally there would be another encoder on the idler wheel so slip could be detected..
[22:15:58] <CaptHindsight> v2?
[22:16:03] <jesseg> But maybe a better traction mechanism is better
[22:16:07] <CaptHindsight> or plan B :)
[22:17:28] <jesseg> I would design an extruder completely differently than this one is designed. But this is the one my friend ordered off of ebay without consulting me. (We're doing the project together so we can hopefully pool our collective abilities to actually make it work!)
[22:19:14] <CaptHindsight> nobody treats them like a mini melt pump, they just draw filament into them and hope
[22:19:32] <WalterN> hmm
[22:19:41] <WalterN> today feels like friday
[22:20:54] <CaptHindsight> people have been saying that all day in China :)
[22:22:50] <CaptHindsight> WalterN: there must be some small board that does PWM to +- 5V around
[22:23:50] <jesseg> CaptHindsight, are you suggesting that it is surprisingly common for people's repraps to lose steps on the extruder?
[22:24:11] <WalterN> CaptHindsight: I donno... but if that 6i25+7i77 ($250 kit) will work, then I'll be a happy camper
[22:24:44] <WalterN> will the 7i77 work for a stepper motor, as well as switching a laser on and off?
[22:25:03] <CaptHindsight> jesseg: yes, jams, out of round filaments, and contamination
[22:25:05] <WalterN> and probably a couple different switches
[22:26:03] <CaptHindsight> WalterN: I have those here, I just need some time to track down a few things but I'm buried with actual work right now
[22:26:55] <WalterN> CaptHindsight: you have the 6i25 and the 7i77?
[22:27:08] <CaptHindsight> http://forum.arduino.cc/index.php/topic,137845.0.html
[22:27:12] <CaptHindsight> WalterN: yes
[22:27:52] <CaptHindsight> WalterN: there must be a board out there somewhere
[22:28:23] <CaptHindsight> http://forum.arduino.cc/index.php/topic,17548.0.html
[22:29:22] <CaptHindsight> it's easy enough to make, lots of different ways to design a circuit for that
[22:30:10] <WalterN> and... I just broke a tool
[22:33:07] <CaptHindsight> http://www.ti.com/lit/an/spraa88a/spraa88a.pdf
[23:06:59] <CaptHindsight> WalterN: the lowest cost way might be to make linuxcnc use the stereo audio out to drive the galvos and parallel port for the stepper
[23:08:17] <WalterN> lol
[23:08:38] <WalterN> and just amplify the signal from the audio port?
[23:09:20] <CaptHindsight> stereo out to the galvo driver board
[23:09:46] <WalterN> it does 5volts?
[23:11:29] <WalterN> actually... neh.. I'd rather not use the audio ports
[23:12:41] <WalterN> and the computer I'd use (my current desktop computer - its getting oldish...) does not have any serial ports except for USB
[23:13:00] <WalterN> erm
[23:13:10] <WalterN> parallel ports or RS232 or w/e
[23:19:44] <CaptHindsight> the 6i25 with some modified firmware
[23:20:46] <CaptHindsight> or as is, but add stepper and servo boards
[23:22:35] <WalterN> will the 7i77 work alright with a stepper?
[23:24:06] <CaptHindsight> no, that's the problem, maybe PCW has a 2 servo and stepper + IO board
[23:24:42] <CaptHindsight> seems to be one or the other but not both
[23:25:09] <WalterN> oh hmm
[23:25:16] <WalterN> meh
[23:25:21] <WalterN> how about a servo?
[23:25:22] <WalterN> heh
[23:25:29] <CaptHindsight> so it's 3 boards
[23:25:37] <WalterN> I think thats what it was designed for, servos, right?
[23:27:31] <CaptHindsight> 6i25 + 7i77 + 7i76 will work with the least amount of effort
[23:27:52] <CaptHindsight> it's just not the easiest on the pocketbook
[23:28:25] <CaptHindsight> 7i78 is also step and dir
[23:30:48] <CaptHindsight> 6i25 + 7i77 + 7i78
[23:31:09] <WalterN> hmm
[23:31:55] <WalterN> could I get a servo to work with the 7i77?
[23:32:13] <CaptHindsight> it supports 6 of them
[23:32:33] <WalterN> so I could get a servo instead of a stepper XD
[23:37:01] <WalterN> would I need a special servo driver?
[23:37:46] <CaptHindsight> it all just works, just ned to configure an ini file
[23:38:13] <CaptHindsight> tune the servos
[23:38:42] <WalterN> when buying a servo system, what should I be looking for?
[23:39:04] <WalterN> torque, encoder resolution... (I guess anyway)
[23:39:08] <CaptHindsight> bbl
[23:41:22] * WalterN waves at Valen
[23:54:18] <Valen> ?
[23:55:34] <WalterN> (hi)