#linuxcnc Logs

Jan 24 2020

#linuxcnc Calendar

01:43 AM Loetmichel: Hmpf. Ebay quality. Bought new "Angel eyes" led bulbs for my BMW half a year ago... monday left side dark, today right side burned out :-(
01:48 AM Loetmichel: mornin' btw
01:48 AM Jymmm: cgi https://www.amazon.com/TopoGrow-Carbon-Filter-Hydroponic-Growing/dp/B06XJFSLMW?th=1
02:10 AM Deejay: moin
04:58 AM jthornton: morning
05:00 AM Tom_L: morning
05:01 AM XXCoder: heys
05:08 AM jthornton: wow I can burn 0.6GB of bandwidth a day for the rest of the month lol
05:09 AM XXCoder: fancy :)
05:09 AM XXCoder: did you see lego quadcoper?
05:09 AM jthornton: yea
05:10 AM XXCoder: i was surpised because lego motors is quite heavy lol
05:10 AM jthornton: dunno why he called it a drone because it was not a drone
05:10 AM jthornton: just the fact that he got it airborne is amazing for sure
05:12 AM XXCoder: indeed
05:12 AM Loetmichel: yeah, as powerless as those lego motors are its indeed a feat to get it airborne with all that weight
05:13 AM Loetmichel: i suppose he REALLY overvolted them though
05:13 AM XXCoder: yeah he tested lego motor limiter to find highest he can go
05:15 AM XXCoder: lego motors have current limit it will shut down if too much
05:15 AM XXCoder: not surpising, they want to avoid harming kids
05:16 AM Loetmichel: considering that my selfbuilt quadcopters have 200W bruhsless motors in them that are 3 times overloaded at max throttle that is still a feat with normal lego motors
05:17 AM XXCoder: yeah
05:18 AM XXCoder: man I want quadcoper i got cheaper one it didnt run well lol
05:18 AM XXCoder: it cant even fight wind
05:18 AM Loetmichel: actually: 4 times... at full throttle the quad draws a bit more than 200 A out of the 4s lifepo pack ;)
05:18 AM XXCoder: light one at that
05:19 AM Loetmichel: 100W is usually sufficient to hover an 1kg copter though, if you have decently efficient props
05:19 AM Loetmichel: 100W for all 4 motors, not one
05:20 AM Loetmichel: or in other words: with an efficient motor and prop you need about 100W to produce 1kg of thrust
05:21 AM XXCoder: interesting
05:21 AM XXCoder: i want to try fpv airplane but damn thats expensive
05:21 AM XXCoder: and I dont even know if I would get as sick as dog by it or not
05:22 AM jthornton: you can get small ones cheap
05:22 AM XXCoder: so far I checked tend to be over 100 bucks without even controller and goggles
05:31 AM Loetmichel: thats why that copter takes off like a rocket if you "full throttle" it from the get go... 3200W equates to roughly 28kg of thrust... with an 1kg copter thats PLENTY ;)
05:33 AM XXCoder: indeed
05:33 AM XXCoder: that reminds me of that ww2 plane
05:34 AM XXCoder: it had 2 ton thurst power, and if you fire all 4 motor guns (really powerful ones) you get negative 2 tons thrust if motors is full on that time
05:34 AM Loetmichel: its very funny if i am flying in a park or similar and have passers by ask: "how fast/high can it go?"... just put the throttle to the metal for 3 secs... gone... "does that answer your question?"
05:34 AM XXCoder: fire it long enough and plane stalls and goes backwards
05:34 AM XXCoder: forgot what plane name tho
05:34 AM XXCoder: dang
05:37 AM Loetmichel: XXCoder: the A10c is said to do that when you fire the gatlin without full afterburner, but AFAIR thats a legend.
05:39 AM jthornton: the A10 just had two turbofan engines and no afterburner
05:40 AM Loetmichel: as i said: It was an UL as far as i can tell
05:41 AM Loetmichel: but even if you s/afterburner/throttle it is not stopping entirely if i read the articles to that topic correctly
05:41 AM Loetmichel: it just gets slower.
05:41 AM Loetmichel: Iif i remember it right it said that it runs out of ammo before stalling the plane
05:54 AM jthornton: 1,174 rounds of ammo firing at 3,900 rounds per minute on a 50,000 pound plane going 300 knots I'd think it would not even slow dow
05:54 AM jthornton: n
05:56 AM XXCoder: gau-8 can fire 61 bullets a secopnd, 5 tons recoil force
05:56 AM XXCoder: a-10 have 2 engines, with 4 ton of thrust each
05:56 AM XXCoder: https://what-if.xkcd.com/21/
05:57 AM XXCoder: car and cop part is really funny
05:59 AM XXCoder: lol Gryazev-Shipunov GSh-6-30 "half of weight but higher fire speed"
06:17 AM _unreal_: sigh.. off to work.
06:19 AM XXCoder: oh well
06:19 AM XXCoder: jthornton: managed to snag big slab of wood
06:19 AM XXCoder: perfect for base of laser engraver
06:20 AM jthornton: nice, will you paint it with the super black paint?
06:20 AM XXCoder: lol nah
06:20 AM XXCoder: that might cause fires
06:20 AM XXCoder: it captures light too effeciently to be good paint for laser base ;)
06:21 AM jthornton: I hope my van is done today
06:22 AM jthornton: both outer tie rod ends, right front wheel bearings, both lower control arm and ball joints
06:41 AM XXCoder: hope its done, annoying to not have car
06:41 AM XXCoder: or vehicle
06:46 AM jthornton: I have Rusty the truck to drive locally
06:52 AM XXCoder: :)
06:52 AM jymmmm: XXCoder: You should have these printed on business cards and if you ever get pulled over, hand them the card and you license... https://what-if.xkcd.com/imgs/a/21/jetpack_speeding.png
06:52 AM XXCoder: this truck, jthornton ? https://upload.wikimedia.org/wikipedia/en/f/f7/Mater_%28Cars%29.png
06:53 AM XXCoder: jy lol but curious if its engravable, saving for later
06:53 AM jymmmm: XXCoder: =)
07:29 AM * jthornton might do some work today...
07:31 AM jymmmm: jthornton: The boss said you can take the day off and go play.
07:31 AM jthornton: but I have an interesting project to work on...
07:32 AM jymmmm: jthornton: In that case.... carry on =)
09:03 AM unterhaus: seems like I just failed the capcha test because I am of the unconventional opinion that a bike lane is not a crosswalk
09:04 AM unterhaus: goog probably has some genius machine learning algorithm that has mislabled every road marking as a crosswalk
09:12 AM unterhaus: anyone ever cleaned out a heat exchanger? They sell 55 gallon drums of vinegar
09:25 AM SpeedEvil: What sort of exchanger?
09:27 AM unterhaus: it's a water-oil exchanger in a hydraulic power unit
09:27 AM unterhaus: I figure it's like a 20 year old coffeemaker now
09:32 AM SpeedEvil: Can you see inside / boroscope?
09:32 AM SpeedEvil: USB ones are real cheap
09:35 AM unterhaus: I was thinking about borescope, have to look at it. I have borescopes, not sure about access
11:33 AM Loetmichel: hmm, just heard a nice "thought for the weekend" on the radio: "If you want to experience true happieness you have to say goodbye to the fear of doing something wrong". Or in Yodas words: "There IS no TRY, Do or dont, but dont try!" :-)
11:44 AM gregcnc: not the same
12:27 PM * JT-Shop is glad he has 6' of material... just scrapped one part
02:14 PM gregcnc: Fastenal must be plenty busy not to take walk in customers
02:16 PM CaptHindsight: gregcnc: seriously! Which one, i tend to walk in rather than order from the website.
02:17 PM gregcnc: cary
02:17 PM gregcnc: told me I could order online
02:17 PM CaptHindsight: I used to walk in there but....
02:17 PM CaptHindsight: the one farther north has closed...
02:18 PM CaptHindsight: the one in Cary used to be in CL
02:18 PM CaptHindsight: they really turned me off since they like to be pushy
02:19 PM CaptHindsight: they keep on offering to stop by to keep my shelves stocked with fasteners since I guess it's a really hard problem to know when you are low or out :)
02:19 PM gregcnc: idk. website said they had what I wanted to so went to the store. they said I need an account
02:20 PM CaptHindsight: that is new, they were always pushy about getting an account by I didn't until I had ordered online
02:21 PM gregcnc: started year an a half ago. it's probably been that long since i was there
02:21 PM CaptHindsight: i just never end up going to fastenal anymore
02:21 PM CaptHindsight: same for Grainger and McMaster
02:22 PM CaptHindsight: I only go to them if it's a last minute emergency
02:23 PM CaptHindsight: well Grainger has $1/box sales on fasteners I use
02:23 PM gregcnc: they had M8x110 SHCS. I found one bolt i could use from BMW leftovers, but need 2 to tension the belt in the mill
02:27 PM CaptHindsight: i guess they are still good if you need a few of some fastener not common to hardware or automotive supply stores
02:28 PM gregcnc: McMaster works for me. I forgot about these when I ordered from them the other day
02:29 PM gregcnc: it's too bad McMaster doesn't do 500 or 1000ct of smaller fasteners
02:29 PM gregcnc: 100ct is still cheaper than other places 1000 or 5000
02:30 PM CaptHindsight: for jumbo orders I check ebay
02:31 PM CaptHindsight: for M3 and M4 SHCS and similar I have gotten them for what the shipping cost might be elsewhere
02:33 PM gregcnc: i avoid china though, would rather not a have a fastener be the downfall of something I make
02:33 PM CaptHindsight: ve7it: is this your post? http://ve7it.cowlug.org/dspic-servo.html
02:34 PM CaptHindsight: gregcnc: yeah for anything hardened I avoid them, but if it's to hold the enclosure panels on they tend to be good enough
02:35 PM ve7it: CaptHindsight, yes... one of my older projects
02:35 PM CaptHindsight: the crankshaft to harmonic balancer bolt on my truck did not come from China
02:36 PM CaptHindsight: ve7it: "The board is interfaced to the PC through 2 pins of a parallel port. The drive signal on these pins is known as quadrature drive. "
02:37 PM CaptHindsight: ve7it: do have your definition of " quadrature drive" somewhere?
02:37 PM ve7it: yes... I use it on my cnc... much better than step/dir ... if you hook an encoder to the signal pins, it will drive the servo one direction or the other
02:38 PM ve7it: no setup and hold times to worry about like with step/dir... much less likely to miss a step
02:39 PM CaptHindsight: I didn't dig too deep, how fast can it read the quadrature inputs?
02:40 PM CaptHindsight: just ballpark
02:40 PM CaptHindsight: (approximately)
02:40 PM ve7it: the dspic is probably good to several hundred thousand steps/sec...
02:42 PM ve7it: 3000rpm x 4000counts/rev /60sec/min = 200000
02:42 PM CaptHindsight: https://forum.linuxcnc.org/10-advanced-configuration/16935-quadrature-signal-output-for-stepper
02:45 PM CaptHindsight: someone asked about how to get quadrature out of LCNC to your controller
02:45 PM ve7it: use stepping type 2, dont use the reset option
02:46 PM ve7it: lcnc can then incr or decr the command by 1 count every base period
02:50 PM ve7it: so one is still limited by the step rate when using the parallel port (35us base period = 28571 counts/sec) Its important to pick reasonable encoders or use the step multiplier function on the servo drive ( ie can be setup to move 3 encoder counts for every increment command by lcnc )
02:56 PM ve7it: The nice thing with a servo is that if the step commands dont come out smoothly, it doesnt stall like a stepper would. The servo loop is just trying to lock the commanded position to the actual position it gets from the motor encoder.
04:08 PM Deejay: gn8
05:17 PM _unreal_: ve7it, sup
05:29 PM ve7it: not to much.... just headed out the door for friday drinks with the hunting buddies
05:30 PM XXCoder: ve7it: https://i.pinimg.com/originals/2f/28/bb/2f28bbe2da37bd11b9680b8b31b54d3d.jpg
05:31 PM ve7it: haha... not that much drinking involved!
05:31 PM XXCoder: :)
05:32 PM ve7it: funny, where we meet, there are usually 4 deer in the guys back yard.... he has an orchard and they like apples!
05:33 PM XXCoder: nice. hunting i like only if it means people will eat what they kill
05:33 PM XXCoder: fuck caged hunt
05:36 PM jthornton: it has become obvious to me that Qt does not know where it's at
05:41 PM XXCoder: show it the map? ;)
05:42 PM jthornton: I'm referencing the location of the executable file
05:43 PM XXCoder: I know, was kidding :D
05:53 PM _unreal_: hello
05:54 PM _unreal_: ve7it, if your still around I got that motor from ebay. I'M in love with it
05:55 PM _unreal_: there is effectively zero play in the 10/1 gear reduction.
05:57 PM Tom_L: what you gonna do with it?
05:58 PM _unreal_: I'm going to use it for Z
05:58 PM _unreal_: https://www.ebay.com/itm/Electro-Craft-Reliance-Electric-E242-242-024-0141-Servo-Motor-Planetary-Gearhead/383317344051?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
05:58 PM _unreal_: I got it for $26
06:01 PM _unreal_: ?
06:24 PM _unreal_: well off for the 3hour tour
07:29 PM XXCoder: patreon clickspring video!
07:29 PM XXCoder: its not 2 minutes either
07:40 PM XXCoder: https://www.goldplating.com/collections/jewelry-plating-kits/products/jewelmaster-option-1-3-anodes-no-chemicals product mainly talked about
07:41 PM XXCoder: wow its expensive
07:41 PM XXCoder: in video it seems very well designed
08:04 PM Javabean: why not do the "vacuum deposit" method of plating?
08:05 PM ziper: don't you need a rather strong vacuum for that?
08:06 PM Javabean: according to the various youtubes i have seen, they aren't hard to get...nor are they expensive. level of vacuum seems to vary, or atleast "method of vacuum" does
08:12 PM XXCoder: java dunno i was talking about clickspring patreon only video
08:12 PM XXCoder: he was using it
08:12 PM Javabean: ... durp
08:14 PM XXCoder: no plm heh
08:14 PM XXCoder: you made me wonder about vacuum ones
08:14 PM ziper: then again 1000 bucks could get you a turbopump
08:18 PM XXCoder: https://www.instructables.com/id/A-better-vacuum-chamber/
08:18 PM XXCoder: car spark plugs
09:02 PM SpeedEvil: https://i.imgur.com/QGEtwcm.png - I am unsure about the appropriateness of this item as a valentines gift. Though the vendor thought it appropriate for a valentines day sale.
09:04 PM XXCoder: ummmm
09:04 PM XXCoder: clothes hanger is cheaper
09:04 PM XXCoder: seriously tho that just isnt great
09:32 PM Jymmm: Just found bought a Smith Corona Silent for $40 - https://www.typewriters101.com/store/p392/1947_Smith-Corona_Silent.html
09:43 PM Javabean: i still think its awesome how 40lbs devices are considered portable in those days. can't even get people to carry a 10lbs laptop these days
09:53 PM XXCoder: heh first portable pcs had inbuilt crt screens
09:53 PM XXCoder: imange the weight
09:53 PM XXCoder: its portable as in "luggable"
09:55 PM roycroft: i used to have an osborne
09:57 PM Javabean: i used to have a apple II+, and i couldn't leave it on the desk when i wasn't using it... does that count?
10:01 PM roycroft: the IIc was their first one that they considered portable
10:02 PM roycroft: the II+ was luggable but not designed to be
10:03 PM roycroft: but, being your machine, you can call it whatever you want :)
10:04 PM Javabean: good, i was tempted to call it george, but it was a lil heavy to "hug and squeeze"
10:05 PM roycroft: i wouldn't want to call anything george, but george would be less horrible than donald
10:07 PM Javabean: donald seems to work for ducks
10:13 PM CaptHindsight: Javabean: kids just have it so easy today, 40lbs is the weight of our backpacks on the way to elementary school :)
10:13 PM CaptHindsight: is/was
10:14 PM Javabean: and kids don't need to walk to school, 20 miles uphill both ways
10:14 PM CaptHindsight: and computers were giant refrigerator sized things and the terminals were the size of small pianos
10:15 PM Javabean: and you didn't need to check your email, social media every day either
10:17 PM CaptHindsight: https://interestingengineering.com/video/watch-two-teenagers-try-to-dial-a-number-on-an-ancient-rotary-phone
10:17 PM Javabean: i swear i have seen that video elsewhere not long ago
10:21 PM CaptHindsight: I think my dad had a rotary until at least 2000
10:25 PM roycroft: i still have a working candlestick phone with a rotary dial
10:25 PM roycroft: it was made in the 1920s
10:27 PM roycroft: thos kids are not that stupid, capthindsight
10:27 PM roycroft: that is staged
10:29 PM XXCoder: heh i still remember dialing 711, and hoping its ringing, place it on my tty and wait for answer from relay
10:30 PM CaptHindsight: https://youtu.be/updE5LVe6tg?t=399 staged?
10:31 PM roycroft: that one may be stuipd
10:31 PM roycroft: stupid
10:32 PM roycroft: if i had never seen a rotary phone before i am sure i'd be able to figure out how to dial a number in like 10 seconds
10:32 PM roycroft: and i'm not even remotely in the class of smart people
10:35 PM CaptHindsight: https://youtu.be/Gjin8t633pc?t=380 not easy for lots of people old enough to have had one
10:37 PM roycroft: loading a camera is not as intuitive as dialing a phone
10:37 PM CaptHindsight: https://www.youtube.com/watch?v=zE_2AbY2qnY
10:37 PM CaptHindsight: How to Use Your New Dial Phone
10:39 PM XXCoder: someone added captions
10:39 PM XXCoder: but when I see old videos like that, autocaptions seem to be almost always perfect. wonder why
10:43 PM _unreal_: hello
10:43 PM _unreal_: just got back... GOD what a fucking long ride
10:43 PM _unreal_: also had to go all the way to the super walmart because everything was closed. my dashcam memory card died
10:44 PM _unreal_: on mon. I didnt figure out exactly what it was till tue.
10:44 PM _unreal_: and I've had to work stupid late every day this week because the moron managers screwed up the project.
10:54 PM CaptHindsight: roycroft: was on local TV here, the two teenagers with the dial phone
10:55 PM CaptHindsight: https://www.youtube.com/watch?v=BAMDncfPHGs
10:55 PM XXCoder: probabkly selected few out of bunch
10:55 PM XXCoder: worse ones
10:56 PM XXCoder: look though 1000 people you probably can find someone who cant chew gum and walk at same time
10:56 PM CaptHindsight: around here it's closer to 1000
11:05 PM Javabean: i got tired of walking around town, well actually i got tired of seeing so many people facedown in a wad of chewing gum with a cellphone next too them
11:05 PM XXCoder: lol
11:05 PM XXCoder: free phones!
11:21 PM _unreal_: There just finished soldering most all of the parts I have onto the pcb'S
11:21 PM _unreal_: ve7it, untill I get the ordered parts. all I have left are the SMD parts jumpers and jumper-wires.
11:28 PM XXCoder: new robrenz video. its 1.5 hours long
11:28 PM XXCoder: spindle rebuild
11:29 PM XXCoder: wonder if he will grind all bolts on it
11:32 PM _unreal_: ?
11:32 PM XXCoder: he is rather infamous on ultrahigh precision
11:32 PM _unreal_: never heard of him
11:32 PM XXCoder: https://www.youtube.com/watch?v=grUdsTTRGl4
11:33 PM _unreal_: well I'm leaning towards mesa
11:33 PM _unreal_: par port isnt going to give me the step rate I need
11:33 PM XXCoder: he once saw other guy video complaining about camera holder being sloppy. he went and made huge indictor arm and made it in riciousluy high precision level
11:33 PM Tom_L: good idea
11:33 PM XXCoder: he even ground indictor arm balls to veru high degree of roundness
11:34 PM Tom_L: _unreal_, stepper or servo?
11:37 PM XXCoder: _unreal_: https://www.youtube.com/watch?v=LWUHlyi-8Mc
11:37 PM XXCoder: enjoy
11:37 PM XXCoder: HUGE indictor arm
11:38 PM _unreal_: sevo
11:38 PM _unreal_: brushed sevo
11:39 PM XXCoder: 21"26 is ball grinding
11:39 PM XXCoder: balls would have worked as is but he dont like imprecision
11:39 PM XXCoder: so he made fancy ball grinding jig
11:39 PM XXCoder: uses lathe
11:41 PM XXCoder: he gifted a copy to tgat guy, he said "its freaking nuts" basically
11:41 PM XXCoder: way super overkill
11:43 PM _unreal_: heeh ya think
11:44 PM _unreal_: there goes ve
11:44 PM _unreal_: ve7it
11:44 PM XXCoder: https://www.youtube.com/watch?v=DVLXsq7pi9Y one about ground stones
11:44 PM XXCoder: how to maintain em and how to make em flat
11:45 PM _unreal_: So my next step is to program my pic's
11:46 PM Javabean: whelp, it seems scotty managed to beam xxcoder into a place with "intelligent life"
11:46 PM XXCoder: lol
11:47 PM XXCoder: im been here couple years longer than in reprap
11:47 PM Javabean: for all the stuffs you do, have you ever done "manual milling"
11:48 PM XXCoder: not a lot but yeah
11:48 PM XXCoder: last one was 2 years ago, trimming bad stock block (it was too fat and slanted on one side)
11:48 PM Javabean: lol
11:49 PM Javabean: let me guess, if you are subbed to rob... it was slanted about 30seconds
11:51 PM XXCoder: lol nah
11:51 PM XXCoder: i just put in fixture, set tool and cut off the excess
11:51 PM XXCoder: 2 minutes or so
11:52 PM Javabean: 2minutes work to fix about 15seconds of slant?
11:52 PM XXCoder: not sure what youre picturing
11:52 PM XXCoder: one side was 1/2 inch wider than other
11:52 PM Javabean: degrees -> hours -> minutes -> seconds .... measure of angles
11:53 PM XXCoder: and it wasnt precision work, it was raw block after all, prepping to make it work fine
11:53 PM Javabean: oh, you are right... i didn't think about it being that far out
11:56 PM * Javabean mutters and decides to go ahead and try out his favorite 'hobby'
11:57 PM Javabean: i call it SLEEP... one day i will do a writeup on it that i can share and see if anyone else would be interested in trying it
11:57 PM XXCoder: lol