#linuxcnc | Logs for 2014-08-10

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[00:00:10] <XXCoder1> FinboySlick: best bet is epoxy grinite
[00:00:13] <PetefromTn_andro> I've been spendingso
[00:00:31] <FinboySlick> PetefromTn_andro: Tune in next weekend to find out what the next crush will be!
[00:00:34] <XXCoder1> its few hundred bucks but you get LOT material to make epoxy grinite blocks or stuff
[00:00:46] <PetefromTn_andro> Some qualityt time with my new cellphone Lol
[00:00:48] <Valen> that seems like a terrible way of treating a surface plate
[00:01:09] <FinboySlick> XXCoder1: There's a monument shop not too far from my dad's. Getting good granite wouldn't be the tough part.
[00:01:15] <PetefromTn_andro> DA
[00:01:19] <XXCoder1> nice
[00:01:24] <XXCoder1> nowhere aroun here lol
[00:01:31] <XXCoder1> not that I can afford it
[00:01:41] <FinboySlick> XXCoder1: They make tombstones all over the place.
[00:01:44] <PetefromTn_andro> Damn thing is so much smarter than me
[00:02:02] <XXCoder1> HMM steal tombstones with nice flat back and regrind it :P
[00:02:07] <XXCoder1> (bad joke)
[00:02:22] <FinboySlick> PetefromTn_andro: Don't fall in love with her! She's not actually *in* the phone.
[00:02:56] <PetefromTn_andro> Although it is taking some getting used to this keyboard on it
[00:03:07] <FinboySlick> XXCoder1: If I get a mildly spiteful ghost, I bet it'd drop the slab on my toes.
[00:03:14] <XXCoder1> lol
[00:03:23] <PetefromTn_andro> Oh sure she is man and she is FINE!!
[00:03:54] <FinboySlick> PetefromTn_andro: Heed the warning. See what happened to Raj in Big Bang Theory.
[00:04:09] <PetefromTn_andro> Never saw it.
[00:04:35] <FinboySlick> https://www.youtube.com/watch?v=vti6yzyuy1I
[00:08:18] <FinboySlick> The joke at the end is that Raj can't talk to women unless he's drunk.
[00:09:04] <PetefromTn_andro> Sorry was answering email on the phone whilechatt
[00:09:19] <XXCoder1> aw autocaption is gibberish
[00:09:20] <PetefromTn_andro> Lemme watch the video here.
[00:10:05] <FinboySlick> PetefromTn_andro: Big Bang Theory is an aquired taste to most people but I'm rather fond of it. One of the few shows that actually work well with a laughing track.
[00:10:28] <FinboySlick> (and apparently, they aren't canned laughs for this one)
[00:10:32] <PetefromTn_andro> Interesting never watched it before.
[00:11:22] <PetefromTn_andro> Damn it says this video is unavailable on thus platform for some reason
[00:12:15] <FinboySlick> PetefromTn_andro: As far as brainrot (tv) goes, it's pretty good, casual fun. Grab season 1 for a couple bucks at the walleemart store and see if it bites.
[00:13:04] <PetefromTn_andro> Might check it on Netflix if they have it.
[00:13:38] <PetefromTn_andro> This phone sounds pretty good on my headphones though
[00:15:59] <PetefromTn_andro> Android keyboard is decent on it tho but the one it boots up with does not have some features I am
[00:16:06] <PetefromTn_andro> Used to
[00:16:28] <FinboySlick> PetefromTn_andro: If you want a full keyboard, check hacker's keybard.
[00:16:38] <FinboySlick> It's a real qwerty layout and you can get four rows.
[00:16:56] <XXCoder1> yea love it]
[00:17:08] <XXCoder1> dont work on my tiny phone though lol
[00:17:17] <PetefromTn_andro> This has several querty options I gotta investigate
[00:17:33] <FinboySlick> Off to bed I go now.
[00:17:45] <FinboySlick> Hopefully won't dream of haunted surface plates.
[00:17:45] <PetefromTn_andro> Nite man
[00:18:03] <XXCoder1> lol
[00:22:13] <XXCoder1> russia is fucking crazy https://www.youtube.com/watch?&v=g91xkISmp2g
[00:26:17] <Jymmm> XXCoder1: love it!!!
[00:26:40] <XXCoder1> lol
[00:33:48] <XXCoder1> hmm http://hackaday.com/2014/08/05/thp-entry-a-holonomic-drive-3d-printer/
[01:36:15] ChanServ changed topic of #linuxcnc to: http://linuxcnc.org | Latest release: 2.6.2
[01:37:37] ChanServ changed topic of #linuxcnc to: LinuxCNC is a linux-based open-source CNC control. | Latest release: 2.6.2 | http://www.linuxcnc.org
[02:11:28] <Deejay> moin
[09:28:39] <Jymmm> Consider an inverted 'T'. Is there some ratio of height vs width in which it doesn't exceed being too top heavy and not fall over very easily?
[09:30:13] <archivist> google centre of gravity calculations
[09:30:55] <Jymmm> archivist: thanks.
[09:34:14] <Jymmm> Not what I was looking for, but interesting... http://www.wikihow.com/Calculate-Center-of-Gravity
[09:41:57] <archivist> it is how you judge the tipping point, it will not tip if the cg is inside the outer contact extents
[09:46:19] <Jymmm> Right, I just not sure how to determine height as a factor.
[09:50:11] <JT-Shop> a 1" diameter rod 1 times tall as wide does not tip easy, the same rod 10 times taller than the diameter tips easy because less angle is needed to get the CG outside the base
[09:51:08] <Jymmm> So, would the height be based upon weight per inch height?
[09:51:20] <Jymmm> (per that link)
[09:58:17] <JT-Shop> well that link seems to be examining see saw's
[09:58:50] <Tom_itx> use carbon fiber, it's lighter and stronger :)
[09:59:11] <archivist> determining your cg is how you decide
[09:59:39] <archivist> or cheat.... add weight to the base
[09:59:52] <Tom_itx> consider the big road advert signs on a single pole...
[10:00:17] <Tom_itx> amazes me how some of them stay up
[10:01:02] <XXCoder1> heys
[10:01:02] <Jymmm> archivist: Even cheating, it's still detemrine when, and how much weight to add.
[10:01:59] <archivist> add weight till the CG is inside at the angle you want to be safe
[10:02:50] <archivist> this is trivial if you happen to have solidworks
[10:03:04] <Jymmm> Yeah, I just saw that actually =)
[10:03:11] <Jymmm> But I don't have SW2010
[10:03:23] <Jymmm> https://forum.solidworks.com/message/190348
[10:03:23] <archivist> it is in older versions
[10:56:03] <Jymmm> Is there a definition of "stable" ?
[10:57:37] <Jymmm> Nascar: Tony Stewart killed another driver
[11:02:22] <Tom_itx> yeah
[11:02:45] <Tom_itx> dude shouldn't have been on the track
[11:03:14] <Tom_itx> especially in open wheel
[11:04:07] <Jymmm> Well, it was yellow... were the drivers going a "controllable" speed? did his spotter warn him in time? at all?
[11:04:41] <Jymmm> No charges for Stewart it seems.
[11:04:43] <Tom_itx> appears he took the same line as the car in front of him. only time he slipped was when he was on top of the driver
[11:04:59] <Jymmm> ah
[11:05:06] <Tom_itx> watch it closely
[11:05:16] <XXCoder1> "slipped when on top" :P
[11:05:23] <Tom_itx> xactly
[11:05:54] <Tom_itx> not much to guard those large rear tires
[11:05:56] <Jymmm> I did see it at all. But I suspect it will end his racing career from an emotional perspective
[11:06:11] <Jymmm> http://www.foxnews.com/sports/2014/08/10/nascar-driver-tony-stewart-fatally-strikes-driver-at-dirt-track-event/
[11:06:13] <Tom_itx> could be, on top of his own recent injury
[11:06:41] <Tom_itx> he likely owned the track too
[11:06:46] <Tom_itx> i'm not sure about that one
[11:07:40] <Jymmm> YEah, the killed driver should never have been on the track like you said.
[11:08:02] <Tom_itx> it's one thing to get out and wave your fist but he went into the line of traffic
[11:08:27] <Jymmm> Yeah, directly towards the over cars
[11:08:40] <Tom_itx> and kept going even after the first car passed
[11:08:49] <Jymmm> youeven see him zig-zag towards the cars
[11:10:13] <Jymmm> Track Rage
[11:10:28] <Tom_itx> young driver too
[11:11:35] <Jymmm> Young ARROGANT driver
[11:11:47] <Tom_itx> reminds me of kyle bush
[11:12:01] <Tom_itx> but he's aging and getting more control
[11:12:07] <Jymmm> heh
[11:12:19] <Jymmm> If we could only same the same for #24 =)
[11:12:36] <Jymmm> but I think he's getting worse, at least his whining is.
[11:13:05] <Tom_itx> i think some of that comes from being in jimmy's shadow
[11:13:44] <Jymmm> Nah, he's always been a whiner; ever hear the driver-to-crew radio chat? It's pretty bad
[11:14:46] <Tom_itx> no i don't listen to much of that
[11:15:29] <Jymmm> This is back when the broadcaster would reply driver chat
[11:20:29] <asah> Hey all, quadrature hysteresis problem. I am getting more counts in one direction that the other out of my glass scales today
[11:21:01] <asah> heidenhain LS403 -> interpolator board.
[11:21:16] <asah> -> mesa quadrature board.
[11:21:27] <Jymmm> No clue what is defined as "stable" http://www.tis-gdv.de/tis_e/ls/ls_im_strassenverkehr/kapitel2.html#_Quelle1
[11:21:29] <asah> filter off.
[11:23:39] <archivist> Jymmm, and a side wind will change all that
[11:25:11] <Jymmm> archivist: In my case, the height will never exceed 24". I'm just trying to determine what a stable base would be.
[11:25:35] <Jymmm> either by width or width and weight.
[11:25:56] <Jymmm> (equal mass)
[11:25:56] <archivist> the answer is it depends!
[11:26:52] <Jymmm> Yeah, That's what I've figured out. There is no "defined" stableness, just what's "acceptable" it seems.
[11:27:25] <Jymmm> I just want to know when I'm pushing my limits primarily
[11:27:49] <pcw_home> asah: halplot the A/B pins when moving slowly to look for anomalies
[11:28:08] <Jymmm> ...and dead people.
[11:28:10] <asah> good idea.
[11:34:49] <asah> do I really have to relaunch linuxcnc everytime I change an axis MAX_ACCELERATION?
[11:34:56] <asah> how are people tuning this?
[11:36:23] <CaptHindsight> asah: mostly by trial and error
[11:36:38] <archivist> or using one of the config tools
[11:37:41] <asah> any way to see if I am clipping on accelleration?
[11:38:01] <asah> ie not accellerating enough. I am talking pinwise.
[11:40:00] <asah> pcw_home: I setup the hall feedback using the 7i84 I just got. way safer!
[11:40:15] <asah> now the amp enable pin is actually disabling the amp
[11:40:33] <asah> no more runaways on joint errors
[12:03:48] <IchGuckLive> hi all
[12:04:19] <IchGuckLive> 2.6.2 nice seams te bugreports are realy full
[12:04:40] <IchGuckLive> k6mle: ?
[12:06:26] <IchGuckLive> asah: yes you have to and make shure not to use the X shutsdown only by Menue
[12:07:04] <IchGuckLive> asah: you most start with a comen setup
[12:07:30] <IchGuckLive> then if all runs perfekt go up by 1/4 etch setup try
[12:07:52] <IchGuckLive> if it still runs and you like to se mre go up once more
[12:08:23] <IchGuckLive> if it fails then go back by 25% and try a larger run on toolload
[12:18:24] <asah> thanks. yes, I certainly am a fan of starting small. there is a strange behavior in my setup where once a following error hit, the amp would not be disabled (I was using wake and shake and needed the init pin to be fired on estop off)
[12:19:17] <IchGuckLive> use a mashie off not a estop
[12:19:18] <asah> and once following error hit, PID would accumulate a ton of error and try and runaway.
[12:19:27] <asah> its all good now.
[12:19:39] <asah> I reconfigured my pins.
[12:19:46] <IchGuckLive> the following error hits maybe of to fast
[12:19:56] <asah> now amp enable correctly disables the amps on following error
[12:20:08] <CaptHindsight> asah: are you tuning servos?
[12:20:09] <IchGuckLive> ok i see you only asking in the night here in europ
[12:20:34] <asah> yes I am tuning servos.
[12:20:44] <asah> torque mode pid tuning is making my head hurt
[12:21:00] <asah> so different than velocity mode
[12:21:01] <asah> !
[12:21:23] <asah> mesa 8i20 -> parker servo
[12:21:32] <asah> -> maho 400e
[12:22:01] <asah> am getting lots of velocity lobing, thought it was motor related, but had my Dgain way too high.
[12:22:06] <IchGuckLive> the 400E is a good mashine
[12:22:16] <IchGuckLive> lots of them in education use
[12:22:41] <asah> I am loving it. had it up under philips 432 control, which was painful
[12:23:05] <asah> was very happy to get it up under linuxcnc with the original 3phase amps and dc motor setup.
[12:23:15] <asah> now ripped that out and working through the single phase conversion.
[12:26:03] <CaptHindsight> asah: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?PWM_Servo_Amplifiers are you aware of HALscope?
[12:27:52] <asah> yeah, I am halscoping away.
[12:28:12] <asah> I have all the relevant things plotting.
[12:28:28] <asah> and starting with some good pcw advice
[12:28:50] <asah> I have a loop move doing G0 moves of 5 mm
[12:29:58] <asah> with a 1 sec dwell at each end.
[12:30:05] <asah> triggering on position descent.
[12:30:26] <asah> I am seeing velocity overshoot.
[12:30:39] <asah> then correction then overshoot.
[12:31:07] <asah> basically only have Pgain(8) and Dgain(.1)
[12:31:36] <asah> on a move at 500mm / min I am getting about two overshoots.
[12:32:11] <asah> with the associated lobes in position trace and error
[12:32:13] <zeeshan> anyone know how much the 9x42" bridgeport table weighs
[12:32:35] <CaptHindsight> way over 10lbs
[12:33:33] <asah> if I double the Pgain I get double the overshoot lobes.
[12:37:30] <archivist> zeeshan, weigh it so we can answer that question next time
[12:37:37] <zeeshan> archivist: no
[12:37:48] <zeeshan> im trying to find a stand
[12:37:52] <zeeshan> that will hold the weight of the table
[12:37:54] <zeeshan> as i slide it off
[12:38:07] <zeeshan> im thinking a 500lb stand should do
[12:38:27] <CaptHindsight> http://www.ebay.com/itm/Bridgeport-Series1-Knee-Mill-Column-Casting-Knee-Ram-32-Table-with-other-parts-/321472398728 heh selling all the parts that usually don't wear out
[12:39:13] <archivist> good iron to make a machine from
[12:39:15] <zeeshan> http://www.rockfordballscrew.com/products/retrofit-kits/bridgeport-kits/
[12:39:19] <zeeshan> i dunno if i can trust this!
[12:39:34] <zeeshan> to copy the ball screw dimensions off of
[12:39:45] <zeeshan> im ordering some ball screws from lin motion bearings2008 ebay
[12:39:45] <CaptHindsight> zeeshan: they are near me, they make good stuff
[12:39:50] <zeeshan> i aint using rockford
[12:40:02] <zeeshan> they want 1k for those 2 ball screws
[12:40:08] <zeeshan> i rather pay 120$
[12:40:09] <zeeshan> :D
[12:40:18] <archivist> 3 thou per foot and only rolled not ground
[12:40:42] <zeeshan> archivist: ball screw mapping :-)
[12:41:06] <archivist> yes but you should not need that
[12:41:52] <archivist> mapping is for very high precision or making a silk purse from a sows ear
[12:42:02] <zeeshan> lol
[12:43:39] <CaptHindsight> zeeshan: it's well under 200 lbs
[12:45:23] <CaptHindsight> zeeshan: are you going to borrow that 3d scanning system to map the mill?
[12:45:24] <IchGuckLive> zeeshan: you can build that as heavy as you like on steel frame
[12:46:01] <zeeshan> haha Capt
[12:46:05] <zeeshan> all you need is a dial indicator :D
[12:47:08] <archivist> dti only maps a short stroke
[12:48:06] <zeeshan> you can reset them
[12:48:09] <zeeshan> by moving them
[12:48:13] <zeeshan> and 0ing
[12:48:22] <zeeshan> takes a while, but the job will get done
[12:48:55] <zeeshan> my longest range indicator is 6"
[12:49:10] <zeeshan> so for a 42" table, would have to reset 7 times
[12:49:11] <zeeshan> :[
[12:49:15] <zeeshan> er 6 times
[12:49:47] <archivist> and dont forget to add in the dti error :)
[12:49:55] <zeeshan> dti has no error!
[12:49:56] <zeeshan> :P
[12:50:00] <zeeshan> 0.00000000000000000000001
[12:50:16] <zeeshan> archivist: when i was testing the lathe
[12:50:21] <zeeshan> i ended up doing dual dtis
[12:50:36] <zeeshan> 5 tenths indicators
[12:50:49] <CaptHindsight> clearly he has already made up his mind
[12:50:51] <zeeshan> you know everythings good when both of them read the exact same thing :P
[12:51:13] <CaptHindsight> zeeshan: let us know how you would do it differently next time :p
[12:53:05] <CaptHindsight> http://www.ebay.com/itm/16-5-T-Slot-Table-/331214633540 16.5' T-Slot Table
[12:53:38] <CaptHindsight> too bad it looks like it was stored under water
[12:53:48] <zeeshan> lol
[12:54:01] <archivist> there are limits to measurement, to minimise errors your gear has to be an order of magnitude better than the thing you are measuring, else your results still contain bunkum
[12:54:16] <archivist> that will clean up
[12:54:21] <SpeedEvil> Don't tell NASA that.
[12:55:20] <CaptHindsight> SpeedEvil: those guys are just getting the hang of imperial vs metric, give them a break
[12:57:47] <zeeshan> so does anyoine use linear actuators
[12:57:57] <zeeshan> to lock the gibs on their cnc mills
[12:58:01] <zeeshan> when doing some serious milling
[12:58:33] <archivist> adjust them so locking not needed
[13:01:09] <skunkworks_> http://electronicsam.com/images/KandT/testing/stirling/stirling.jpg
[13:07:37] <archivist> erm does the bottom rod look not square
[13:31:49] <skunkworks_> archivist: must be optical illusion
[13:33:00] <skunkworks_> archivist: that side the crank is all the way down so the angle is pretty steep coming to you
[13:36:12] <Jymmm> JT-Shop: Comments? http://sfbay.craigslist.org/sby/mcy/4607877617.html
[13:44:01] <IchGuckLive> BYE
[13:44:18] <zeeshan> https://trqeug.dm2301.livefilestore.com/y2pkZ0hoQcmh7jJ47MC_i4B7hC2ueV-xM_p0tgxMpkA8AlGGqK2wSmvNPm3k7NOlM-Ug4qIRzRt1D6X_xH6w4PS-b3LemSCiTd2ACYzbZs4JzM/WP_20140808_009.jpg
[13:44:24] <zeeshan> im liking this engraving tool
[13:55:02] <archivist> you need a rotating spindle and a cutter like that to automate http://www.collection.archivist.info/archive/DJCPD/PD/2003/2003_07_30_Dial_Norfolk/P1010008.JPG
[13:57:02] <zeeshan> that is nice!
[13:57:33] <archivist> that was a repair job full story http://www.collection.archivist.info/searchv13.php?searchstr=norfolk+dial
[13:57:55] <archivist> we insert patch repaired it
[13:58:37] <archivist> boss did pillars and hands I did the inserts and engraving
[13:58:53] <archivist> he did the silvering after too
[14:06:31] <CaptHindsight> http://www.ebay.com/itm/New-Alloy-Steel-Mounting-Bracket-For-57mm-NEMA23-Stepper-Motor-/321424073079 http://i.ebayimg.com/00/s/NDYzWDcyMA==/z/FIIAAOxy3HJTIrkA/$_12.JPG the thickness of the sheet metal is cleverly left off the drawing
[14:09:28] <archivist> you can scale it off the rest
[14:09:36] <archivist> not so clever
[14:09:58] <CaptHindsight> if it's to scale
[14:10:35] <archivist> print it to scale, I note the web looks a bit puny
[14:11:25] <CaptHindsight> http://www.ebay.com/itm/For-57mm-NEMA23-Stepper-Motor-WHITE-of-Aluminum-Mounting-Bracket-Professional-/151339714225
[14:12:14] <chopper79> Looks like .125" material based on the images.
[14:12:22] <archivist> hmm professional and an extrusion that may be out of square
[14:12:42] <CaptHindsight> well it's white aluminum
[14:14:06] <archivist> colour blind salesmen too
[14:15:59] <archivist> we should invoke our local advertising rules more in the UK
[14:16:51] <CaptHindsight> http://www.servocity.com/html/stepper_motor_mounts.html easy to connect nearly any Actobotics™ component, these would have been nice as a kid
[14:17:12] <CaptHindsight> aluminum extrusion erector sets
[14:18:15] <chopper79> Is there actually a demand for mounting brackets like the ones listed above?
[14:18:50] <chopper79> I would not think there would be but could be wrong. Seems liek something most would build
[14:18:56] <CaptHindsight> chopper79: mostly for DIY projects like glue guns
[14:19:29] <chopper79> got ya
[14:20:44] <chopper79> Heck I could make these all day out of 6061, I know it would not be "WHITE of Aluminum" ..haha
[14:20:59] <CaptHindsight> I just need a bunch for some simple actuators, +- 0.1" precision systems
[14:22:02] <CaptHindsight> I was just trying to find what's out there. I make them out of 6061 angle now, but it's a waste of my time for <$20 ea
[14:22:39] <chopper79> I understand, sometimes its better to buy then build.
[14:22:49] <chopper79> when cost is the factor
[14:27:14] <kfoltman> CaptHindsight: I have these mounts
[14:28:26] <kfoltman> 3.5mm exactly
[14:28:37] <CaptHindsight> kfoltman: the steel ones?
[14:28:45] <kfoltman> CaptHindsight: yes
[14:28:59] <CaptHindsight> wow, thicker than the guess :)
[14:29:16] <kfoltman> I'm using one for my Y axis, works fine for hobby work
[14:32:10] <CaptHindsight> I'm not using them for anything precision or that needs much torque (<1N-m)
[14:34:41] <kfoltman> chopper79: well, would it be "YOLK of Aluminum"? (-:
[14:34:52] <CaptHindsight> and they all seem to put the mounting holes for the mount under the motor
[14:35:25] <kfoltman> CaptHindsight: yes, that's a bit unfortunate IMHO
[14:35:49] <CaptHindsight> plus I need mine tapped
[14:35:56] <kfoltman> CaptHindsight: I tapped mine
[14:36:07] <kfoltman> or, no
[14:36:09] <kfoltman> I tapped the motor :)
[14:36:10] <CaptHindsight> I better build that tapping station
[14:37:55] <CaptHindsight> I need the screw heads on the other (back)side of the motor face plate, foiled again!
[14:40:34] <kfoltman> on an unrelated note, is it practical to try and rebuild the broken-off tip of a 0.1mm v-bit?
[16:22:07] <Deejay> gn8
[22:09:38] <humble_sea_bass> roofles
[22:12:31] <Tom_itx> mighty quiet evening