#linuxcnc Logs

Feb 05 2020

#linuxcnc Calendar

12:09 AM rue_mohr: is the chip an fpga?
12:18 AM CaptHindsight: ChinaCo ASIC that you pin strap for different combos of serial and or LPT ports
12:18 AM rtce9a: CaptHindsight, i think they have same chip as https://www.ebay.com/itm/RS232-RS-232-Serial-Port-COM-DB25-Printer-Parallel-Port-LPT-to-PCI-E-PCI-Expre/193310802473?_trkparms=aid%3D1110001%26algo%3DSPLICE.SIM%26ao%3D2%26asc%3D20160323102634%26meid%3D8d72e74e1ca14281b6f42266dbc00543%26pid%3D100623%26rk%3D4%26rkt%3D6%26sd%3D183132128667%26itm%3D193310802473%26pmt%3D0%26noa%3D1%26pg%3D2047675&_trksid=p2047675.c100623.m-1
12:21 AM CaptHindsight: http://www.wch.cn/products/CH382.html
12:22 AM rtce9a: CaptHindsight, I purchase these driver from ebay, TB6600, have you had any experience wiring to breakout board ?https://www.ebay.com.au/i/333350772376?chn=ps&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&itemid=333350772376&targetid=836267705198&device=c&mktype=pla&googleloc=9071263&poi=&campaignid=6472417595&mkgroupid=77265351546&rlsatarget=pla-836267705198&abcId=1141716&merchantid=7364522&gclid=EAIaIQobChMI5M_O_d-55wIVEyUrCh1P
12:22 AM rtce9a: zQU-EAQYBSABEgK2hPD_BwE
12:27 AM CaptHindsight: rtce9a: sorry, I don't use any of the TB6600 stepper drives
12:30 AM CaptHindsight: http://diyprojects.eu/wiring-and-running-tb6600-stepper-driver-with-arduino/
12:30 AM CaptHindsight: http://diyprojects.eu/wp-content/uploads/2016/05/TB6600-input-output-diagram-662x408.jpg
12:31 AM CaptHindsight: active LOW Step and Dir inputs
12:32 AM CaptHindsight: http://diyprojects.eu/wp-content/uploads/2016/02/BL-TB6600-v1.2-green-pcb-open-case-backside-662x376.jpg
12:32 AM CaptHindsight: microstepping settings are silk screened on the PCB
12:33 AM CaptHindsight: http://diyprojects.eu/wp-content/uploads/2016/02/BL-TB6600-v1.2-green-pcb-open-case-microstepping-and-power-limiting-potentiometer-662x347.jpg
01:11 AM Deejay: moin
01:12 AM elmo40: blarg
03:39 AM rtce9a: CaptHindsight thanks for helping
04:56 AM jthornton: morning
04:56 AM XXCoder: hey
04:56 AM XXCoder: today was busy man. fast parts, and mill2 is finally working
05:01 AM Tom_L: morning
05:01 AM Tom_L: is that the new one?
05:03 AM XXCoder: mah a61 mill 2 broke its covers for spindle 3 weeks ago, been limpign along with short term fix, but shut down last week for week long repairs
05:04 AM XXCoder: best time for heavy maintance so they did that too
05:04 AM XXCoder: shop is bit slow now due to 737 thing
05:12 AM Tom_L: same here
05:12 AM Tom_L: they cut all OT for the boys
05:26 AM XXCoder: tom about ot its bit odd, last week I could have ot because there was one part that was really late
05:27 AM XXCoder: apparently shop ordered those alum blocks but it didnt arrive till day before due date
06:55 AM Deejay: re
07:22 AM Loetmichel: and i did it again: another 2 Ender3 printers ordered on my own money... lets see how long it takes THIS time to get the 320 eur back from the company ;)
07:46 AM jymmmm: Loetmichel: And Why did you do that?
07:46 AM jymmmm: Loetmichel: And why dont you just ask for a company credit card instead?
07:47 AM jymmmm: Loetmichel: Did you get your drone yet?
07:47 AM jymmmm: Good morning all!
07:47 AM Loetmichel: drone?
07:48 AM jymmmm: Loetmichel: I thought it was you that liked that pocket drone
07:48 AM Loetmichel: because it takes aaaages to get the company paypal account to pay for things
07:48 AM Loetmichel: nope, i buy my own drones ;)
07:49 AM Loetmichel: s/buy/build
07:50 AM jymmmm: https://www.aliexpress.com/item/32837242349.html
07:50 AM jymmmm: Loetmichel: ^^^^^^^^^^^^^^^
07:51 AM Loetmichel: nah, too small.
07:52 AM jymmmm: too small for what?
07:54 AM jymmmm: Loetmichel: andd if you are building your own, whats the average USD cost?
08:07 AM Loetmichel: Jymmm: no idea, probably a few 100 to a 1000 eur
08:07 AM Loetmichel: depending on how much features they hae
08:07 AM Loetmichel: have
08:08 AM Loetmichel: that one was close to a 1000eur/usd: http://www.cyrom.org/palbum/main.php?g2_itemId=12997&g2_imageViewsIndex=1
08:14 AM jymmmm: Loetmichel: ok, and why too small? Whats the flight time of the one you just showed me?
08:16 AM Loetmichel: depends on payload: without SLR: about 20 to 30 min
08:17 AM Loetmichel: with an extra battery 42 min
08:17 AM Loetmichel: with a cam: depedning on weight so 15 min
08:21 AM jymmmm: Loetmichel: That drone can carry a full sized DSLR camera?
08:22 AM SpeedEvil: I have not looked closely at the specs, but looking at the scale, that does not look unreasonable.
08:27 AM Loetmichel: Jymmm: yes
08:28 AM jymmmm: cool
08:28 AM JT-Shop: Loetmichel, how big is that hex?
08:29 AM Loetmichel: it has close to 1200 gram TOW and can carry about 5kg payload. only for a few minutes though
08:29 AM Loetmichel: because the motors will eat insane amounts of power at that weight
08:29 AM SpeedEvil: There is also a trade between wind immunity/airspeed and power consumption/duration
08:29 AM SpeedEvil: You can make a drone that will fly for 2h.
08:29 AM Loetmichel: JT-Shop: those props on it are 12"
08:29 AM SpeedEvil: - a quadcopter I mean, not winged.
08:29 AM Loetmichel: to give you a sense of scale
08:30 AM SpeedEvil: But, in 25mph winds, it's not going to be able to keep stationary
08:30 AM JT-Shop: my 660mm with 330mm props weighs 2000 grams with the battery
08:31 AM Loetmichel: SpeedEvil: my drones can cope with up to 90kph winds. been tehre done that... they are flying sideways at that airspeed though
08:31 AM Loetmichel: to hold position
08:31 AM SpeedEvil: Loetmichel: yeah. 2h is way on the edge though
08:31 AM SpeedEvil: For a vertical propellor drone anyway
08:31 AM Loetmichel: JT-Shop: 660mm on motor centers?
08:32 AM Loetmichel: so our hexas are similar in size.
08:32 AM Loetmichel: just that mine is lighter and has probably bigger motors.
08:32 AM JT-Shop: opps the Tarot hex is 680mm on center
08:32 AM unterhaus: I'm trying to figure out if I can get any of my planes under .55 pounds
08:33 AM JT-Shop: the battery weighs 500 grams
08:33 AM SpeedEvil: I point everyone at https://www.rcgroups.com/forums/showthread.php?961876-225-mg-so-far-but-gonna-be-lighter!
08:34 AM Loetmichel: JT-Shop: my batteries are a bit over 240gr IIRC
08:35 AM JT-Shop: my battery is 6S 3300 mAh
08:35 AM unterhaus: probably a fools errand on my part
08:36 AM Loetmichel: yeah, i use 4s 230mAh Lifepo4 packs
08:36 AM Loetmichel: aka battery drill cells
08:36 AM Loetmichel: A123
08:36 AM Loetmichel: 2300mAh
08:36 AM SpeedEvil: 18 milligram airframe, 160mg battery, ...
08:37 AM gregcnc: I want to try solar planes this year
08:37 AM jymmmm: Loetmichel: Where are you getting the Lipo packs from?
08:37 AM unterhaus: are there solar cells light enough?
08:37 AM gregcnc: sure
08:38 AM Loetmichel: Jymmm: i dont use lipo packs any more
08:38 AM Loetmichel: i use Lifepo4
08:39 AM jymmmm: ok, where are you getting them from?
08:39 AM Loetmichel: and i buy them at the usual sources aka hobbyking and german battery webshops
08:40 AM gregcnc: https://youtu.be/zzOjhA-toN8
08:48 AM gregcnc: jymmmm A123 are cylindrical cells otherwise the typical pouch cells are marketed as LiFe
08:48 AM gregcnc: is there still a lot of fake A123?
08:50 AM gregcnc: I had an airplane that ran 10S2P 26650 A123
08:51 AM jymmmm: gregcnc: ok
08:52 AM jymmmm: I saw a 4 pack of 18650's 2AH at walmart for $14.99, was kinda surprised
08:52 AM gregcnc: junk, probably
08:53 AM gregcnc: there are few hobby forums (RC, flashlight) that test batteries
08:54 AM jymmmm: Yeah, I dont see "westinghouse" 18650's as being "quality"
08:56 AM gregcnc: LG, panasonic, sony, samsung
09:47 AM unterhaus: I have an 80" wingspan Piper Cub that takes some ridiculous amount of batteries. No place to fly it right now. They put up an elementary school in my flying field because they wanted to sell the existing school.
10:13 AM unterhaus: I have been doing some work in the sim so I can fly in my backyard. My favorite plane is the Stevens Aero Groove.
10:14 AM unterhaus: 45 inch/110 cm wingspan
10:38 AM jymmmm: big back yard, lol
10:39 AM jymmmm: Besides rPi, what else boots from a linux distro?
10:40 AM unterhaus: not really that big. tight turning radius. plane would probably get stuck in a tree
10:40 AM unterhaus: beagle boards and variants, smoothie board?
10:42 AM unterhaus: I'm a bit curious about linuxcnc on a smoothie. Seems doable
10:43 AM unterhaus: okay, I'm a bit confused about smoothieboards. Is it really running grbl?
10:45 AM unterhaus: or should I say is it split between and arduino and linux
10:46 AM unterhaus: the older versions of the smoothie board have been cloned and are quite cheap on amazon
10:46 AM Rab_: Weird project: https://www.instructables.com/id/DIY-Magnetic-Drill-Press/
10:46 AM Rab_ is now known as Rab
10:49 AM unterhaus: that motor looks pretty useful.
10:50 AM unterhaus: okay, looks like smoothie runs the steppers from the ARM, so might be able to get linuxcnc on there
10:50 AM skunkworks: unterhaus: rpi4 runs linuxcnc pretty good.
10:53 AM unterhaus: rpi4 would be easier, since there are buildbot builds for it
10:53 AM unterhaus: what hardware do people usually use?
10:57 AM unterhaus: huh, an rpi4 with a mesa ethernet card would certainly solve my cabinet space issues
11:01 AM skunkworks: unterhaus: yes - I am using ethernet - also the spi
11:02 AM skunkworks: unterhaus: https://youtu.be/2SEB7TuCUR0
11:04 AM unterhaus: probably work just as well as the old Celery mini PC I am considering
11:05 AM skunkworks: depends. boot the livecd and run the latency test.
11:13 AM unterhaus: what is the physical connection between the rpi and spi board?
11:13 AM SpeedEvil: https://patentscope.wipo.int/search/en/detail.jsf?docId=US248873852&tab=PCTDESCRIPTION - I don't think I linked this here - if I did not - this is the tesla car caster.
11:14 AM SpeedEvil: Depending on metal material type being used, a hot or cold chamber die casting machine may be used, as well as squeeze casting methods, in addition to over-molding, where alloy is casted over/around existing substrates in order to achieve higher structural properties of an end product.
11:15 AM unterhaus: skunkworks, how much memory does your rpi have?
11:18 AM X704 is now known as tiwake
11:18 AM unterhaus: are you using the 7i90?
11:20 AM sync: SpeedEvil: that's not a new idea
11:20 AM SpeedEvil: sync: no.
11:20 AM SpeedEvil: sync: doing it on a highly multi-axis machine to form the whole car chassis is. (or at least is novel in the car industry and has not been patented before)
11:43 AM SpeedEvil: https://twitter.com/elonmusk/status/1225109674904772608
11:43 AM SpeedEvil: 'Title: Elon Musk auf Twitter: "Please send your resume to BuildStarship@spacex.com if you’re coming to the Starship career day in Boca Chica tomorrow" (at twitter.com)
11:43 AM SpeedEvil: Fun.
11:57 AM skunkworks: unterhaus: 4gb
11:57 AM skunkworks: unterhaus: 7i92 currently
11:58 AM unterhaus: I have 50 pin daugherboards, so the ethernet card that works with that is $150
11:58 AM unterhaus: vs $60 for spi
11:59 AM skunkworks: I have used both styles.
11:59 AM unterhaus: how do you physically connect the spi to the rpi4?
11:59 AM skunkworks: (50pin and 25pin)
11:59 AM skunkworks: I think it is a short ribon cable.
12:09 PM skunkworks: it would have to be short.
12:10 PM pcw_home: Yes ~2 inches
12:10 PM skunkworks: jeff had a picture - But I cannot find it.
12:15 PM unterhaus: I should probably just get the ethernet card
12:17 PM skunkworks: one thing to note.. I had to run a 500hz servo thread.
12:17 PM skunkworks: I haven't gotten back to testing - you might be able to do a 1khz servo thread if you isolate all but 1 core.
12:20 PM unterhaus: are you talking about ehternet or spi?
12:25 PM pcw_home: SPI seems fine at 1 KHz on the RPI3 or RPI4 ( but the RPI3s 1G max RAM is an issue for dense backplots )
12:30 PM unterhaus: is ethernet slower?
12:32 PM pcw_home: it really depends on the hardware I have not tried a back-back Ethernet/SPI comparison
12:33 PM pcw_home: I have no issue with SPI at 1 KHZ on RPI3 or RPI4 both with isolcpus=1,2,3 (only CPU 0 for userland)
12:34 PM pcw_home: I have not tried the same on Ethernet but I can when I get a chance
12:52 PM unterhaus: andypugh, are the stmble standoffs and fan brackets designs in the stmbl repository? I have access to a 3d printer, but no cad tools atm
12:53 PM andypugh: I believe so.
12:54 PM unterhaus: I'm staring at the file names and they are not revealing their secrets
12:54 PM andypugh: I think my belief is wavering
12:54 PM unterhaus: :)
01:01 PM Loetmichel: *giggle* An external designer called me 16:30 today to "just tell me that the new project is running well"... just came home from work, and only because my wife called on the smartphone at 19:30 asking if i wanted to come home today at all... MAN that guy is sure nice to discuss everything and anything with and forget the time... (regular end of work would have been 17:00) ;)
01:14 PM unterhaus: go in late tomorrow "I worked late last night"
01:16 PM Loetmichel: unterhaus: i work late all the time. woult i write down the overtime i could go retire early in a few years.
01:16 PM Loetmichel: there is a reason i have a key and a fob for the alarm system ;)
01:16 PM unterhaus: are you an academic?
01:17 PM Loetmichel: nope
01:17 PM Loetmichel: electric engineer in a small computer firm, doing mostly soldering and machining stuff for prototypes
01:17 PM sync: SpeedEvil: I don't think that this is true, I have seen exactly the same idea before
01:17 PM Loetmichel: not studied on an university though
01:17 PM SpeedEvil: sync: the patent office thinks it's true.
01:18 PM unterhaus: the patent office does not claim to look at originality any more
01:18 PM unterhaus: unfortunately
01:18 PM SpeedEvil: yes.
01:20 PM unterhaus: I d/l openscad to look at the stmbl files. No such luck
01:20 PM SpeedEvil: I am of the position that you should not be able to get a patent if the average engineer in the field would be able to re-solve your idea in less time than it takes to do a hundred patent searches.
01:21 PM SpeedEvil: So - say - any engineering problem that can be solved in under 10000 hours or so doesn't ever get a patent.
01:21 PM unterhaus: I feel like they allow patents on all sorts of obvious things
01:21 PM SpeedEvil: yes.
01:21 PM sync: well, having a patent and actually being able to defend it are luckily two different things
01:22 PM unterhaus: the problem is that there are some very simple ideas that have not previously been invented that become obvious once someone invents them
01:22 PM SpeedEvil: unterhaus: To a degree, yes.
01:22 PM Loetmichel: the wheel is a VERY basic idea
01:22 PM SpeedEvil: unterhaus: But if a new technology comes along, and nobody has implemented a old idea on it, that is not actaully a novel invention IMO.
01:22 PM unterhaus: there was a recent example that is slipping my mind right now
01:23 PM Loetmichel: ... tell that to someone that never knew one...
01:23 PM SpeedEvil: 'paint, but on a drone' type patents.
01:23 PM unterhaus: yeah, those should not be allowed
01:23 PM unterhaus: but that is how software patents got allowed, and existing process with major parts replaced by a computer. As if that's not the most obvious thing in the world
01:24 PM unterhaus: a wheel, but 3d printed should not be allowed
01:25 PM unterhaus: openscad is a horrible file viewer, even for openscad files
01:26 PM unterhaus: I just bought some flash drives just to have sitting around, they are all lost
01:34 PM veegee: Tom_L I used the mechanism you described with the "last word" indicator with my Mitutoyo and the holder it came with and it worked out great. I just mounted it in a collet and got the head square in all directions to less than 10µm indicated deviation over 15cm diameter.
01:34 PM unterhaus: okay, not quite true, only the one I want to use is lost
01:40 PM andypugh: unterhaus: https://github.com/andypugh/stmbl/tree/master/hw/tools has the fan clip. I can’t find the spacer. But be aware that the IRAM might get too warm for PLA and machining from Delrin might be better.
01:42 PM unterhaus: thanks, I was looking for your repository and failed
01:43 PM andypugh: The file has only been there for a few minutes anyway.
01:45 PM unterhaus: machining things that aren't round is a problem for now, but I guess the standoffs can be round
01:55 PM andypugh: Round with a step, ideally.
01:56 PM andypugh: I don’t seem to be able to find the drawing, or the model, or the STL
01:57 PM unterhaus: Rene says there is a dxf, but I dunno
02:05 PM unterhaus: would be nice to know the basic dimensions
02:08 PM andypugh: I found the models in an email. Added to the repo
02:10 PM miss0r: why spend 2 pounds on an adapter when you can make one yourself in 2 hours?
02:14 PM unterhaus: miss0r exactly
02:14 PM unterhaus: andypugh, thanks for hooking me up once again
03:07 PM JT-Shop: echo done JT's good for another year
03:07 PM XXCoder: ?
03:09 PM JT-Shop: echocardiogram
03:09 PM JT-Shop: and EKG
03:09 PM XXCoder: ahh ok
03:17 PM Tom_L: veegee, glad it worked out
03:18 PM Tom_L: JT-Shop, when you go to the grand canyon and listen for your echo?
03:22 PM JT-Shop: lol
03:23 PM XXCoder: tom go and start that tradition
03:30 PM JT-Shop: sounds squishy actually
03:43 PM Deejay: gn8
05:17 PM skunkworks: unterhaus: https://matrix.org/_matrix/media/r0/download/matrix.org/HEjrVmpZKFXDgXOZFYycGdEz
05:18 PM skunkworks: poop
05:29 PM JT-Shop: skunkworks, is there an image now for the Rpi4?
06:07 PM skunkworks: JT-Shop: yes - for testing
06:26 PM * jthornton can't seem to make any sense on python-vlc it just seems to go around in circles :(
06:28 PM Centurion-Dan2 is now known as Centurion_Dan
08:10 PM _unreal_: finally X axis is aligned
08:10 PM _unreal_: WHAT a pain in the ass
08:10 PM _unreal_: partly do to my design. AND the parts I had on hand/used
09:34 PM X704 is now known as tiwake
09:39 PM pcw_home: join #hazzy
09:46 PM X704 is now known as tiwake
11:01 PM _unreal_: ve7it, I guess I should explain my self a little better. I was meaning, the autotuning feature is interesting. how hard would it be to do something like that with your controllers? or is that out of the range of what the cpu could handle load wise? just wondering.
11:01 PM _unreal_: seeing as that link to that motor controller is opensource.
11:25 PM veegee: I need to buy an oilstone to deburr my mill table. I'm considering this: https://www.amazon.ca/Norton-614636855653-8-Inch-Combination-Oilstone/dp/B000XK5ZDY
11:26 PM veegee: People are saying that they don't come perfectly flat anymore. Is that a big deal for getting rid of the high spots on my table?
11:26 PM veegee: If it's an issue, what's the best way to flatten it without a surface grinder?
11:27 PM Javabean: by one that someone else has surface ground
11:27 PM Javabean: can confirm... they aren't even close to "flat" anymore
11:32 PM Javabean: also... never, don't ever use one that hasn't been ground flat. if the weys or other ground flat surface have burrs and you use a "non-ground stone" on it, well the burrs will be the least of the issue. you would need to regrind
11:33 PM veegee: I'm not touching the ways, just the table
11:33 PM veegee: would a diamond face mill do the trick to flatten it?
11:34 PM Javabean: good video https://www.youtube.com/watch?v=DVLXsq7pi9Y
11:34 PM Javabean: i don't know about a face mill, sorry
11:35 PM veegee: theoretically a fly cutter or face mill that is wider than the width of the oilstone should be able to make one side perfectly flat
11:37 PM Javabean: as i said, i don't know about it... but according to what i have heard there is more to it than just making the stone flat... but again, i don't know for certain. other than don't touch a ground surface with anything other than a ground stone