#linuxcnc Logs

Jan 30 2019

#linuxcnc Calendar

12:19 AM CaptHindsight: https://www.accuweather.com/en/aq/amundsen-scott-south-pole-station/2258520/daily-weather-forecast/2258520
12:37 AM fragalot: they got the snow predictions wrong here
12:37 AM fragalot: there is so much more than what they said >.<
12:37 AM fragalot: and it's still going
12:38 AM fragalot: (and we are not allowed spiked tires here)
12:38 AM fragalot: or chains
12:39 AM * fragalot googles "how to attach snowplow accessoire to toyota auris"
12:46 AM CaptHindsight: fragalot: get a snowmobile
12:47 AM CaptHindsight: well we were supposedly going to have a mild winter
12:53 AM Deejay: moin
02:45 AM russian_troll: selroc: Today's Log http://www.isaeff.net/logs/%23linuxcnc/2019-01-30.html
04:33 AM jthornton: morning
04:34 AM Deejay: hey jt
04:34 AM XXCoder: morning
05:18 AM Tom_L: morning
05:19 AM Tom_L: 14F Hi 26
05:20 AM jthornton: morning
05:20 AM jthornton: a bit warmer here at 19°F and getting up to a blistering 36°F and sunny
06:08 AM Loetmichel: *gnihi* i am milling an enclosure out of 1,5mm aluminium sheet with about 40 2,5mm drills... made with a 2mm 3 flute that moves in helically at 1200mm/min... the whole router is shaking like it had a seizure ;)
06:08 AM XXCoder: lol you need anti-vibration setup
06:10 AM Loetmichel: XXCoder: like this but faster and more extreme because 2,5mm holes instead of 2,5mm hexagons...-> https://www.youtube.com/watch?v=m7eO5cu-fXg
06:10 AM XXCoder: lol
09:44 AM gp5st: hello. I'm new to all of this and still planning what I want to do and have what's probably a stupid question. Can I use multiple parallel port cards to increase the number of input/outputs/axis control?
09:57 AM -!- #linuxcnc mode set to +v by ChanServ
10:00 AM cradek: yes, but if you have a more complex system you'd probably be happier with special purpose IO/axis cards instead of parallel ports
10:01 AM cradek: check out https://mesaus.com/
10:03 AM gp5st: cradek, thanks :)
10:04 AM gp5st: I must have run across so of their more expensive things first, but what i'm seeing now isn't that bad.
10:21 AM jthornton: for steppers the lowest cost card is the 7i96
10:23 AM gp5st: jthornton, thanks!
10:34 AM Wolf__: its almost easy to use as well =)
10:36 AM Wolf__: jthornton: I should be starting the actual config of my plasma build today once I get all the wiring done, been bouncing back and forth between that and rewiring my lathe for VFD
10:38 AM Wolf__: whole while resisting the temptation to pull the mill apart and figure out what I need to do to mount the new motor on it lol
10:38 AM jthornton: don't over do it lol
10:38 AM jthornton: gp5st: also note you can add more I/O later with the smart serial cards
10:39 AM Wolf__: I figured I would start at the base setup, just getting the travels/limit switches set up, then add stuff to the config in steps, like the THC and pendant
10:41 AM Wolf__: still need to design a new torch holder to allow it to float and break away
10:46 AM gp5st: jthornton, thanks! yeah, this looks like it could be a decent and flexible option
10:47 AM jthornton: gp5st: I wrote a configuration tool for the 7i96 https://github.com/jethornton/7i96
10:47 AM `Wolf_: https://i.imgur.com/s0w2Zmx.jpg https://i.imgur.com/VNcL0F3.jpg
10:49 AM jthornton: dang temp is down to 14°F so tempted to put a heat lamp in the coop but know better
10:49 AM `Wolf_: at least its starting to look like a cnc machine now
11:04 AM FinboySlick: Wolf__: Livingroom might get a bit messy when you start plasma-cutting though.
11:04 AM Jymmm: thats what shopvacs are for
11:04 AM `Wolf_: naa, everything looks better with a fresh coat of fire
11:08 AM `Wolf_: putting the vfd on the lathe was a mistake, now I know what I’ve been missing not having one on the mill lol
11:09 AM `Wolf_: https://i.imgur.com/gh8D22y.jpg and new panel with high/manual/low speed switch, frequency set knob, jog button and spindle rpm display https://i.imgur.com/Vl1m5xz.jpg =)
11:10 AM gregcnc: temp creeping up -17°F(-27°C)
11:34 AM fragalot: 'sup
11:38 AM Loetmichel: Wolf__: s/fire/sputtered metal
11:39 AM Deejay: gregcnc, thats f***ng cold!!!
11:39 AM `Wolf_: hard wood floors and walls, wouldnt take long for it to be fire
11:40 AM fragalot: nothing beats a good old fashioned titanium fire
11:40 AM Loetmichel: Deejay: nah. just a "little fresh" ;)
11:40 AM gregcnc: tonight is supposed to be -30°F
11:40 AM Deejay: Loetmichel, i know, t-shirt-weather for you
11:41 AM Loetmichel: yes :-)
11:42 AM Loetmichel: i have to admit that wehen i was out smoking in tshirt and jeans in -14°C last week at the company i started chattering after talking with the neighbor over the fence for half an hour
11:43 AM Loetmichel: s/chattering /shivering
11:45 AM Jymmm: Loetmichel: and the neighbor had a coat and gloves on?
11:46 AM Loetmichel: coat yes, gloves no
11:47 AM `Wolf_: my mills power feed is annoying, should I add a external hang on the axis feed box or lcnc it but put some sort of disconect on the motors if I want to run manaul… hmm
11:49 AM fragalot: Wolf__: what about adding force-feedback encoder handwheels after you've lcnc'd it?
11:50 AM `Wolf_: I have glass encoders on it already
11:50 AM `Wolf_: 5um DRO installed
11:50 AM fragalot: I meant for manual control
11:50 AM fragalot: s/encoder/MPG handwheel/
11:51 AM fragalot: but with force feedback because that feels so much nicer
11:51 AM `Wolf_: aye, might be a idea
11:57 AM sensille: from time to time i get "program exceeds machine maximum on axis z". when i run it anyway, it's fine. positive z is up. the program is operating only in a small range of the machine. what do i do wrong?
11:59 AM `Wolf_: safe Z set to high in cam?
12:00 PM sensille: i'm using f360, and clearance height is set to 15mm from stock top
12:00 PM sensille: which is very far from machine top
12:01 PM sensille: but when i start the program, the first move goes all the way up
12:01 PM `Wolf_: not sure, I remember having the same issue, but I forget what it was
12:01 PM sensille: also it might have to do with my z touch off problems, i think after that move z is off by about 0.1mm
12:02 PM sensille: which does not happen if i run z up and down manually
12:09 PM `Wolf_: been too long since I ran my cnc, I forgot all the little things lol
12:17 PM sensille: try to remember harder please! ;)
12:20 PM fragalot: toolchange height?
12:21 PM sensille: i only touch off z after a manual tool change
12:21 PM sensille: haven't looked at the tool table yet
12:22 PM sensille: i have the impression that sometimes it happens, sometimes not, even with the same program
12:22 PM sensille: it would be helpful to know the line number that's causing the warning
12:23 PM gregcnc: do you have limit switches?
12:24 PM gregcnc: homing?
12:24 PM sensille: only for homing
12:24 PM sensille: at -0.5mm on Z
12:24 PM gregcnc: if the traverls exceed soft limits , but the prg doesn't bump the siwtches it will run if you accept teh warning
12:25 PM gregcnc: typing shitty
12:25 PM sensille: it runs
12:25 PM sensille: can it cause Z to be of by 0.1mm if it hits the switch?
12:25 PM gregcnc: no
12:25 PM gregcnc: it would stop
12:26 PM sensille: ok, so that's not it
12:26 PM sensille: is there a way to find the offending line?
12:26 PM sensille: apart from bisection?
12:27 PM gregcnc: like was said it's probably a Z+ move to a clearance plane
12:27 PM gregcnc: very common
12:27 PM sensille: the move goes to 15mm, while Z has about 60mm in that direction
12:28 PM gloops: could overrun the switch if at speed
12:28 PM gregcnc: ok i'ts not that
12:28 PM sensille: i linuxcnc causing z to go up all the way on start, or is it part of the program?
12:28 PM sensille: s/i/is
12:28 PM gregcnc: program
12:29 PM gloops: safe z height?
12:29 PM gregcnc: any G53 moves?
12:30 PM sensille: ah, yes
12:30 PM sensille: N20 G53 G0 Z0.
12:30 PM gregcnc: what is the soft limit on Z+?
12:31 PM sensille: ok, Z0 is a bad idea. that's the absolute limit
12:32 PM gregcnc: right
12:32 PM gregcnc: add a little room
12:32 PM sensille: i don't know, i don't remember configuring the soft limit with stepconf
12:33 PM gregcnc: check the ini
12:33 PM sensille: need to find where this move comes from in f360
12:33 PM gregcnc: machine setup
12:36 PM sensille: post process -> configuration?
12:37 PM gregcnc: i'm looking this is a bit different than hsm
12:39 PM gregcnc: hmm. doesn't seem to be anything like it. It's probably just in the post.
12:40 PM sensille: or i just change the range of the machine so that 0 is within limits
12:40 PM gregcnc: that's simple
12:40 PM gregcnc: i see it
12:41 PM gregcnc: when you go to post, G53homeposition should show in the list on the bottom right
12:43 PM gregcnc: not sure if that's a permanent edit to the post, though
12:43 PM sensille: i already looked through the list, it's not there
12:44 PM sensille: if it really goes to zero the machine might lose a step or two there
12:44 PM sensille: so it might be related after all
12:44 PM gregcnc: it won't lose steps, but it will give the limit error
12:44 PM gregcnc: and run just fine
12:44 PM gregcnc: unless there is a hard stop there
12:50 PM sensille: other seem to change the Z range to handle this
12:51 PM gregcnc: either way works, but machines should be setup with softlimits slightly larger than actual expected work envelope
12:54 PM sensille: will readjust that home is 0, and the homing switch at +1, absolute machine limit at +1.5
12:58 PM Joe_Hildreth: Hi all
12:59 PM Joe_Hildreth: When using stepconf to import a Mach configuration, which version is supported? Mach 3, Mach 4 or both?
01:01 PM JT-Shop: 3
01:05 PM JT-Shop: it's just a pretty basic import tool I know I wrote it
01:07 PM Joe_Hildreth: Thanks John. I am working on another CNC for the home hobbyist tutorial and I am going over Stepconf. Just wanted to make sure what the option would take. I have never used Mach so didn't know. Thank you sir.
01:10 PM Joe_Hildreth: The list of tutorials is slowly growing. I have done 15 so far and working on 16. I hope they help new folks trying to use LCNC. Here is the play list if your interested. https://www.youtube.com/playlist?list=PLaamliiI72ntlrHKIFjh2VjmehRGgZpjm
01:10 PM Joe_Hildreth: Constructive criticism is welcomed too, BTW
01:11 PM JT-Shop: way to go, I usually don't watch videos and never watch them outside of free time :)
01:11 PM JT-Shop: does the CC work on them?
01:12 PM Joe_Hildreth: No worries. I am just trying to give back a little to the project. You, Andy, Arc-eye and many others have helped me through the years. Thought it would be good to give something to the project than just the best wiring practices. :-)
01:12 PM `Wolf_: *looks at videos
01:13 PM Joe_Hildreth: I have not created captions but I think the auto generated captions work. Let me verify.
01:13 PM `Wolf_: where is the how to for THC with a mesa card =D
01:14 PM Joe_Hildreth: I would like to do some on the Mesa cards, but I don't have any of that hardware. If they actually get used, I would be willing to buy a card and a dughter card and do some stuff on them. Just don't want to spend the money for the sake of spending it though. But hey, I would take a donation. haha
01:15 PM JT-Shop: you can do a video on my 7i96 configuration tool but without the card you can't do a few things
01:15 PM `Wolf_: ^ 7i96 card would be a good starting point
01:16 PM `Wolf_: with a good how to video I bet they would get used more IMO
01:17 PM fragalot: Joe_Hildreth: CC appears to work fine. clear videos, good job. :)
01:18 PM Joe_Hildreth: JT-Shop: The auto generated CC's seem to work. I would like to move to Mesa, but have not done so. Other junk to buy for the shop. Seems like the 7i96 is a good starting point with these cards if I understnd correct.
01:19 PM Joe_Hildreth: I have a whole litany of things that I want to cover. The idea was to start as basic as I could and build the users knowledge base up.
01:20 PM JT-Shop: that's a good idea for sure
01:21 PM JT-Shop: Joe_Hildreth: have you seen this? https://qtpyvcp.kcjengr.com/tutorials/basic_vcp.html
01:23 PM Joe_Hildreth: JT-Shop: No I have not seen that. Thanks for the link! I will be sure to check it out.
01:24 PM Joe_Hildreth: JT-Shop: It reads that it works on Stretch, Does it work on Wheezy? Also, is there a timeline that Stretch will replace Wheezy?
01:25 PM JT-Shop: QtPyVCP does not work on Wheezy only Stretch
01:25 PM JT-Shop: timeline for the OS?
01:26 PM JT-Shop: also http://gnipsel.com/linuxcnc/uspace/ for building LinuxCNC on various OS's
01:27 PM hazzy-m: Joe_Hildreth: it will eventualy work on wheezy, but at the moment there are some bugs when using the PySide2 bindings on wheezy
01:27 PM Joe_Hildreth: I thought that I saw a dev version of Stretch for LCNC (Live CD)? The current one available is Wheezy, I didn't know if it would move to Stretch at sometime in the future. Or is best practice doing uspace for whatever distrobution?
01:27 PM hazzy-m: Your vids are great, and getting better, thanks for the effort!
01:29 PM JT-Shop: yea let me try and remember the link
01:29 PM Joe_Hildreth: Thanks hazzy-m. They are slow coming due to a bunch of irons in the fire, but will eventually get more and more in the playlist. The fun starts I think after you have the basic config for a mchine and then start making changes and mods to it. That is where I hope they become helpful.
01:30 PM JT-Shop: http://linuxcnc.org/dists/stretch/
01:30 PM hazzy-m: almost all the work as been done to make stretch the new official ISO, even the web site and doc changes have been made, all that needs to be done it make it "live", last I head it was going to be around new years ...
01:30 PM hazzy-m: and: http://www.linuxcnc.org/testing-stretch-rtpreempt/
01:30 PM JT-Shop: there it is lol
01:30 PM Joe_Hildreth: Is there a migration path to go from Wheezy to Stretch or is it a new install?
01:35 PM JT-Shop: to change the OS is a new install
01:40 PM Joe_Hildreth: Thanks JT.
01:41 PM Joe_Hildreth: hazzy-m: any ETA when QtPyVCP will make it to Wheezy? Is it close or a ways out?
01:49 PM hazzy-m: it is a ways out. it won't be difficult, but it's not very high priority since QtPyVCP is still in heavy development so most of the people who are interested in expermenting with it are using stretch anyway.
01:50 PM Joe_Hildreth: I will have to put it on my list of things to play with. Thanks for the information. :-)
02:06 PM jthornton: Joe_Hildreth: did you post a link to your tutorials on the forum?
02:07 PM Joe_Hildreth: JT-Shop: No I didn't think about it. You can put a link there if you like, or I can if you want me too.
02:14 PM JT-Shop: Joe_Hildreth: https://forum.linuxcnc.org/32-documents/35935-tutorials
02:14 PM JT-Shop: add your tutorial there
02:40 PM CaptHindsight: gregcnc: it's colder outside than in my freezer right now
02:40 PM JT-Shop: Joe_Hildreth: thanks for posting the list and thanks for not embedding any videos!
02:41 PM Joe_Hildreth: JT-Shop: I added a post to list the tutorials. I will try to update the TOC as I add new videos.
02:41 PM Joe_Hildreth: Your Welcome.
02:42 PM * JT-Shop has the parts cut and blasted... screw work I'm building chicken stuff the rest of the day lol
02:43 PM gregcnc: -34°c tonight and 7° Sunday
02:44 PM CaptHindsight: should be fun
02:45 PM Deejay: weather goes crazy
02:45 PM CaptHindsight: will be out in it soon
02:47 PM CaptHindsight: gregcnc: I recall similar days in the 80's and waiting for the temp to be above 0 to swap a transmission or similar
02:47 PM gregcnc: yeah news had some clips of '83
02:47 PM CaptHindsight: and it felt warm
02:49 PM CaptHindsight: Winnipeg gets this all the time, you don't hear all the hubub about it from them
02:56 PM Jymmm: a square circle... https://youtu.be/aDAuqLUZ_vY?t=99
02:57 PM CaptHindsight: Jymmm: what time in the vid?
02:58 PM Jymmm: CaptHindsight: it's direct
02:58 PM Jymmm: t=99
02:58 PM Jymmm: CaptHindsight: it's already queued in the url
02:59 PM CaptHindsight: just use one nail and a string
02:59 PM CaptHindsight: I got bored at t=103
02:59 PM Jymmm: thats why I queued it for you guys.
03:06 PM Jymmm: CaptHindsight: A recirocal angle grinder https://youtu.be/uLhadA2NMqo?t=269
03:10 PM hazzy-m: LOL, free handing would give a better cut
03:10 PM CaptHindsight: hazzy-m: hah was just thinking the same
03:11 PM gloops: @RoyalFamily
03:11 PM gloops: A cistern is fitted with three pipes, one of which will fill it in 48 minutes, the other in an hour, and the third in half an hour. How long will it take to fill the cistern when all three pipes are open together?
03:11 PM CaptHindsight: https://youtu.be/LfdkwoxQXA8?t=621
03:11 PM gloops: (answers on a postcard to H.M.Queen)
03:12 PM fragalot: huzzah the welder is gone
03:13 PM CaptHindsight: gloops: how many bushels does the cistern hold?
03:13 PM hazzy-m: CaptHindsight: That is better! I made a tile saw with a grinder that was similar
03:13 PM CaptHindsight: or is it pecks?
03:13 PM gloops: thats relative to the diameter of the pipes and water pressure
03:14 PM hazzy-m: it is not needed to solve the problem
03:14 PM CaptHindsight: gloops: are we assume that the pressure is constant in all three pipes?
03:14 PM gloops: the Queen is very thrifty with variables
03:14 PM CaptHindsight: and flow rate
03:15 PM gloops: yes i think so
03:15 PM CaptHindsight: <30 minutes
03:16 PM CaptHindsight: you use the division of roots rule
03:16 PM Deejay: gn8
03:16 PM * hazzy-m used to be able to do those problems in no time before he got a degree, what happened? LOL
03:17 PM hazzy-m: n8
03:17 PM CaptHindsight: 48, 60, 30
03:18 PM CaptHindsight: 60, 48, 30
03:18 PM CaptHindsight: they use 48 vs 45 just for fun
03:18 PM gloops: well, a) fills 1/48th of a tank per minute
03:19 PM CaptHindsight: but thats no longer true
03:19 PM CaptHindsight: 1/60 + 1/48 + 1/30 are fractions
03:20 PM CaptHindsight: you know you have to use decimals
03:21 PM CaptHindsight: hazzy-m: https://www.youtube.com/watch?v=QHMBQMAl45I
03:22 PM CaptHindsight: how long till you lose a finger with this?
03:22 PM gloops: no, its 3s
03:23 PM gloops: 6s
03:23 PM hazzy-m: CaptHindsight: That looks decent! (at removing fingers)
03:25 PM fragalot: interesting clamping mechanism. I wonder if it does anything at all better than just using your finger directly would
03:25 PM CaptHindsight: not sure if you've been around here long enough to have seen this https://www.youtube.com/watch?v=8PSG2al1Sus
03:25 PM gloops: thats a good idea holding something to drill
03:25 PM CaptHindsight: cnc classic ^^
03:25 PM fragalot: CaptHindsight: That's a beauty
03:26 PM CaptHindsight: he went on to design repraps
03:26 PM fragalot: lol
03:27 PM hazzy-m: time to fill the cistern is 14.117 minutes
03:28 PM gloops: my mrs will confirm shortly lol
03:28 PM hazzy-m: hahah
03:29 PM gloops: yes 14.117647 minutes
03:29 PM hazzy-m: first pipe can fill 1.25 tanks in an hour, second can fill 1 in an hour, and third can fill 2 in an hour, so together they can fill 1.25 + 1 + 2 = 4.25 tankes in a hour, so 60/4.25 minutes
03:30 PM hazzy-m: that took way longer than it should have, LOL
03:30 PM * hazzy-m goes back to preschool
03:31 PM gloops: i found common denominator and worked the opposite way
03:31 PM gloops: they are questions on submarine commander application tests with about 30 seconds time
03:32 PM CaptHindsight: use decimals it's faster
03:32 PM hazzy-m: oh, that works too!
03:32 PM gloops: CaptHindsight depends how your brain works i suppose
03:33 PM CaptHindsight: plus any real math problem would have x, y, z and some !, ~ in it
03:33 PM hazzy-m: this one tripped me up, what is the value of (a-x)(b-x)(c-x) ... they the whole alphabet?
03:33 PM hazzy-m: they = thru
03:34 PM CaptHindsight: roman or greek alphabet?
03:34 PM hazzy-m: CaptHindsight: using RPN is faster :)
03:34 PM CaptHindsight: schoolnever liked me
03:34 PM hazzy-m: should work with any alphabet that has an x, but that might be giving it away ..
03:37 PM CaptHindsight: X does not equal x
03:38 PM CaptHindsight: going out to the cold, have 5 layers on
03:40 PM gregcnc: (x-x)=0
03:40 PM Jymmm: xxx
03:41 PM skunkworks: -15 here
03:41 PM gregcnc: what does tonight look like?
04:07 PM CaptHindsight: figures, it's the rare sky blue day but below 0
04:07 PM CaptHindsight: not windt so not too bad
07:28 PM Net|: https://youtu.be/WbvX4wJqPHg?t=295 might work good for rocket stoves, cutting slits in a pipe at an angle
07:31 PM Net|: at 3 min the setup is easier to see
08:13 PM CaptHindsight: https://www.youtube.com/watch?v=rq6z1hShFcE
08:13 PM CaptHindsight: Electric Motor Engine Factory
08:14 PM CaptHindsight: human hands terminate and connect coils
09:30 PM MarcelineVQ: I wonder why, legal requirements for minimum human involvement? :>
09:31 PM MarcelineVQ: *a minimum
09:39 PM MarcelineVQ: really cool video
10:07 PM Tom_L: the real genius is the one that figured out all the machine movements
10:15 PM * flyback bites Tom_L
10:15 PM flyback: hello :)
10:47 PM CaptHindsight: https://youtu.be/rq6z1hShFcE?t=279 robot weaving in 3d
10:49 PM CaptHindsight: BMW skinning the same cat https://youtu.be/xvaQMTcckSg?t=197
10:53 PM MarcelineVQ: right down to the same glove brand
10:55 PM CaptHindsight: then jumps to making batteries
10:57 PM CaptHindsight: plasma treatment before laying down adhesive https://youtu.be/xvaQMTcckSg?t=1028
10:57 PM CaptHindsight: probably looks like scifi
11:00 PM CaptHindsight: auto mkers become battery makers
11:04 PM CaptHindsight: https://www.youtube.com/watch?v=Lj1a8rdX6DU Tesla ahead with electrical and behind on most everything else
11:24 PM flyback: fucking p60 videos
11:24 PM * flyback punches CaptHindsight
11:25 PM flyback: they have to be anal about the maching
11:25 PM flyback: any containmination due to poor seals etc = battery boom
11:25 PM flyback: any unsmooth parts thst cause long term abraising from vibration = boom
11:26 PM flyback: lithium cells are sadist cunts
11:26 PM flyback: the drool at the thought of deeping biting your ass checks
11:28 PM flyback: there's like 0 margin for error
11:28 PM flyback: and when they get it to that level
11:28 PM flyback: they tear up everything and start over
11:31 PM flyback: I understand the need to do that for cars cause of best power to weight
11:31 PM flyback: but for some of my projects I am only going to use lithium phosphate
11:31 PM flyback: only 80% of a ion cell
11:31 PM flyback: but 100000x less bullshit factor
11:31 PM flyback: and longer predicted service life
11:35 PM flyback: did you see that fiskas dealership that went up
11:35 PM flyback: after the one rain storm that caused floods
11:36 PM flyback: https://jalopnik.com/fisker-lost-30-million-worth-of-cars-in-hurricane-sand-5958523
11:37 PM MarcelineVQ: that's really rough
11:37 PM MarcelineVQ: living in storm spots must be a real hassle
11:37 PM MarcelineVQ: to say the least
11:38 PM flyback: did you see the pics
11:38 PM flyback: nothing left
11:38 PM flyback: not even a frame really
11:38 PM flyback: batteries went up
11:39 PM flyback: burned underwater
11:40 PM flyback: that story says otherwise but I heard the batteries did burn
11:49 PM CaptHindsight: if only there was some way to stop corruption
11:50 PM ve7it: more ammunition
11:51 PM CaptHindsight: https://www.youtube.com/watch?v=GeyDf4ooPdo
11:51 PM CaptHindsight: gyro precession
11:54 PM CaptHindsight: why we should be using flywheels to fly planes