#linuxcnc Logs

Jan 12 2019

#linuxcnc Calendar

12:09 AM elmo40: many bottom feeders are laced with heavy metals
12:13 AM elmo40: check out lobster and prons! plenty of crap in them... hence why they taste lovely, I bet. LoL
12:28 AM HighInBC: bottom feeders eat fish poo
12:28 AM HighInBC: might as well boil up some dung beetles and eat those
01:16 AM Jymmm: wood generator https://www.youtube.com/watch?v=fFl1XNVTwfI
01:51 AM fragalot: Jymmm: wood powered cars used to be a thing
02:27 AM Deejay: moin
04:09 AM veek: Oo check this out: https://www.minerals.net/mineral/corundum.aspx
04:10 AM veek: the black stuff is actually eroded emery
04:10 AM XXCoder1: it pops up something that errors out when i click anywhere,. dang
05:00 AM jthornton: morning
05:00 AM XXCoder1: hey jthornton how was things in here last 2 days lol
05:01 AM jthornton: about the same
05:02 AM XXCoder1: lol ok
05:02 AM XXCoder1: had bad internet access issues here finally resolved
05:02 AM XXCoder1: router died
05:02 AM jthornton: dang, got a new faster one now?
05:03 AM XXCoder1: old one was pretty high end but also over 5 years old
05:04 AM XXCoder1: we use a lot of internet everyday, many people lol
05:04 AM jthornton: 5 years old is not very old
05:04 AM XXCoder1: average routers tend to last 3 years
05:07 AM jthornton: that don't sound right, what kills a router that fast?
05:07 AM XXCoder1: heavy and constant usage
05:20 AM gloops: a couple of used routers ive bought the speed control burnt out
05:21 AM gloops: 20k revs though, they are usually only 2 bearings, the top one pretty small
05:21 AM XXCoder1: not that kind of router
05:25 AM gloops: ah
05:38 AM jthornton: lol
05:44 AM XXCoder1: https://www.youtube.com/watch?v=MItgSKIjoDk tormach machine
05:44 AM XXCoder1: pretty good review so far
05:45 AM XXCoder1: pros and cons
05:45 AM syyl: thats the custom keyboard-button guy, right?
05:46 AM XXCoder1: no idea?
05:46 AM Deejay: hi syyl
05:49 AM XXCoder1: dang
05:49 AM XXCoder1: tormach spindle is bad designed
05:49 AM XXCoder1: minor crash you need to do complete rebuild of entire spindl;e
05:50 AM syyl: he considers a 1/4" endmill in steel max
05:51 AM syyl: they went with that annoying R8 design for the spindle and are stuck with it now
05:51 AM XXCoder1: just change it over and sell cheap kits
05:51 AM XXCoder1: basic cat30 could work
05:52 AM XXCoder1: or maybe cat40 if its large enougg. hard to see scale in video
05:52 AM syyl: the new, more expensive tormachs have 30 taper as an option
05:52 AM XXCoder1: largest tool and taper I ever used was cat50 with 8" extension neck with 12" diameter facemill
05:53 AM sync: the spindle catridges are pretty robust from what I hear
05:53 AM XXCoder1: its so heavy I barely can lift it, i had to "knee" it up into spindle.
05:53 AM syyl: they are a very basic design, sync
05:53 AM sync: their reasoning was that people with a bridgeport want a cnc mill
05:53 AM syyl: not much to fubar there :D
05:53 AM sync: yes, but it works
05:53 AM syyl: a pipe, another pipe, a bunch of bearings
05:53 AM syyl: presto, a spindle
05:54 AM XXCoder1: lol basically
05:54 AM XXCoder1: would it be possible to use air bearings for spindle lol
05:54 AM XXCoder1: super high rpm
05:58 AM sync: sure, but most people don't surface with a .1mm radius ball
05:58 AM XXCoder1: lol
06:07 AM tehnull: https://www.youtube.com/watch?v=sFrVdoOhu1Q
06:11 AM Tom_itx: 34F, snow missed us by a couple degrees
06:15 AM Tom_itx is now known as Tom_L
06:19 AM jthornton: same here we got a bit of sleet but that is all
06:19 AM Tom_L: tiny bit of sleet last night but nothing stuck
06:19 AM XXCoder1: you know its been long rainy season when you start drive out in night from work, and "hey roads looks weird" then "oh its dry"
06:19 AM XXCoder1: next few days nice and sunny
08:42 AM elmo40: XXCoder1, that is a large tool! 12" facemill with 8" extension? i bet that was heavy to handle.
08:43 AM elmo40: air spindles are light weight but super fast. 20,000RPM or more. They mist a light oil to help cool everything.
08:44 AM elmo40: makes a mess everywhere! just think of a normal air drill with a constant dribble of oil going into the air inlet. Fog everywhere! Need an enclosure with a ventilator.
08:45 AM SpeedEvil: Or just go with it and add disco lights and pounding bass.
08:51 AM Deejay: re
08:59 AM rmu: XXCoder1: https://www.youtube.com/watch?v=sFrVdoOhu1Q
09:02 AM elmo40: my mistake. i was thinking air spindle. where air makes the speed.
09:04 AM elmo40: granite lathe bed?? wow. that is so cool.
09:30 AM pcw_home: Yeah, Air bearings are super clean (and need very clean air)
09:52 AM gloops: someone asking about an air spindle on facebook - sticking at 400 rpm for a bit before picking speed up
09:58 AM fragalot: good for them
09:58 AM fragalot: :)
10:02 AM gloops: my spindle was doing that - went right by itself
10:02 AM fragalot: clean it, replace the oil with the correct type
10:03 AM gloops: no oil in it
10:03 AM gloops: cold probably
10:52 AM gloops: https://www.dailymail.co.uk/news/article-6336809/Inside-Amazon-warehouse-replacing-high-street.html?ito=social-twitter_dailymailUK
10:52 AM gloops: How 1,000 tiny drones that can scan orders and lift 1,500lbs are replacing humans in warehouse the size of 28 football pitches
11:31 AM fragalot: give the humans something better to do
11:44 AM SpeedEvil: fragalot: 'I have an opening for you in the soylent green production line'.
11:51 AM fragalot: https://imgur.com/gallery/c33UXt2 <== that's actually kinda neat
12:14 PM Sabotend_ is now known as Sabtender
12:14 PM Sabtender is now known as Sabotender
12:21 PM Jymmm: fragalot: I actually have a US gov document showing you how to make a wood powered car, kinda impresive
12:30 PM fragalot: Jymmm: i'm curious how long you have before the spark plugs are covered in tar
12:32 PM Jymmm: fragalot: Well, technically that is pre filtered, like you saw in that video earlier
12:32 PM fragalot: no more than a cigarette filter does
12:32 PM Jymmm: fragalot: Also, it SHOULD be burned off
12:33 PM Jymmm: fragalot: When I say "burned off" I mean that it is consumed as fuel, not as a by-product
12:33 PM fragalot: perhaps
12:34 PM Jymmm: fragalot: In a "perfect" system, the only by product should be CO2
12:34 PM fragalot: I mean - they obviously work, i'm just curious how well it works out long term
12:34 PM fragalot: well, CO2 and carbon
12:34 PM Jymmm: correct
12:36 PM Jymmm: fragalot: I havne't looked into wood GAS as much as full combustion (aka rocket stove style)
12:37 PM fragalot: rocket stoves are quite neat
12:37 PM fragalot: especially if you can add a lot of mass to it
12:37 PM Jymmm: Most designs are pretty crappy
12:38 PM Jymmm: rocket stove is just the "engine", rocket mass stove is something else, which I'm looking into more.
01:29 PM Sabotend_ is now known as Sabotender
02:09 PM elmo40: no, in a perfect system, with a carbon based fuel such as octane, you should only get co2 and h2o.
02:10 PM elmo40: but... we have many other gases in the air, mainly nitrogen, that interact with this equation and cause all sorts of chemicals. NOx emmissions are what we are trying to control now.
02:28 PM Jymmm: elmo40: Was speaking applied, not so much "absolute"
02:37 PM Jymmm: err, "practical" might be a better word
02:49 PM Jymmm: What is everyone using to "backup" their systems?
02:49 PM Jymmm: ...and have you tested restoring too?
02:56 PM roycroft: i primarily use amanda for backups, and yes, i do test the integrity of the backups on a monthly basis
02:56 PM roycroft: amanda is not suitable for a single machine, of course, but it's a great network backup system for a server farm
02:57 PM roycroft: well, i won't say it's unsuitable for a single machine, but it's overkill by an order of magnitude for a single machine
02:58 PM Jymmm: roycroft: Can you restore from it to a replaced dead hdd?
02:58 PM roycroft: it's not an imaging backup system
02:58 PM roycroft: so no
02:59 PM roycroft: one has to reinstall the base os
02:59 PM roycroft: but that's what changelogs are for
02:59 PM Jymmm: bummer
02:59 PM Jymmm: I'm looking for something very "Time Machine" like, no base os install
02:59 PM roycroft: discussing backups is a really large, complex topic
02:59 PM roycroft: and i'm trying to get some shop work done today
02:59 PM roycroft: i have some mdf to break down, and it's sunny and dry, so i want to do that outside
03:00 PM roycroft: i'd be happy to discuss it more later though
03:00 PM Jymmm: carry on =)
03:07 PM Net|: i wonder why did humans pick 360 to represent a year for radians in a circle ? would 500 make more sense ?
03:09 PM Net|: or less even
03:11 PM pcw_home: 360 has nicer divisors
03:12 PM mozmck: yeah, I've heard something to that effect about the imperial number system as well. 12 is divisible by 2, 3, 4, 6, and 12; whereas 10 only by 2, 5, and 10. Makes a lot of math easier in your head or on paper.
03:13 PM pcw_home: Those crafty Babylonians...
03:13 PM mozmck: Is that where it came from?
03:13 PM pcw_home: Yeah they used base 60 math
03:13 PM mozmck: interesting
03:14 PM pcw_home: minutes and hours came from them also
03:14 PM mozmck: The wikipedia article on duodecimal says the number 12 is a "superior highly composite number"
03:15 PM mozmck: https://en.wikipedia.org/wiki/Duodecimal
03:15 PM pcw_home: If we only had 12 fingers we would have been set
03:17 PM fragalot: base 10 makes more sense for decimal (get it?) numbers though
03:17 PM DaViruz: if only we've had one finger we'd have been using binary from the beginning
03:17 PM fragalot: 12 used to be nice because you could divide things using compasses
03:19 PM jdh: it's still nice.
03:20 PM rmu: with binary you can count up to 1024 with your 10 fingers
03:20 PM rmu: probably only if you are some kind of musician
03:21 PM jdh: you lose half your span if you are missing a finger from a freak bowling accident.
03:21 PM rmu: correction, 1023 if you include 0
03:22 PM DaViruz: 512 if you include a sign bit
03:22 PM jdh: stick your tongue out if it is negative.
03:23 PM DaViruz: 496 with signed floating point binary
03:27 PM DaViruz: hm, that can't be right
03:27 PM rmu: you could count from -16 to +15 and have the other hand be the exponent
03:28 PM rmu: say from -3.2 to 3.0 in 0.2 increments
03:30 PM rmu: 1.0 would look funny in this system, thumb is sign, index finger LSB
03:30 PM rmu: left hand exponent right hand mantissa
03:31 PM Net|: https://www.popsci.com/scitech/article/2002-02/who-determined-circle-should-be-divided-360-degrees i wonder if this is the reason mayan calendar resets to account for the 5 days over 3k years
03:53 PM Deejay: gn8
04:09 PM gloops: Net| Iluuminati
04:09 PM gloops: <Net|> i wonder why did humans pick 360 to represent a year for radians in a circle ? would 500 make more sense ?
04:26 PM Jymmm: gloops: http://mathforum.org/library/drmath/view/59075.html
04:27 PM gloops: yes, basically there are 6 equalitaral triangles in a circle
04:27 PM gloops: its all about the sixes ;)
04:27 PM gloops: anyway TV time
04:48 PM Net|: https://netpipe.ca/?page_id=1222 << would this work better for light propulsion ?
04:48 PM Net|: reflects more than just traveling straight line
05:11 PM SpeedEvil: I have not looked.
05:11 PM SpeedEvil: Is that reflecting multiple times off mirrors?
05:11 PM SpeedEvil: 'yes' - until diffraction kills the reflection, so it's basically shortrange only
05:48 PM rmu: photon recycling?
06:06 PM XXCoder1: SpeedEvil: would be fanastic if we somwhow discover 100% reflecting surface
06:07 PM XXCoder1: then next limit of scattering limit of air itself
06:07 PM SpeedEvil: XXCoder1: that doesn't help.
06:07 PM SpeedEvil: Even with it, reflectors rapidly stop being useful.
06:08 PM SpeedEvil: A meter reflector will produce a two meter beam at about 1000km
06:13 PM XXCoder1: yeah though perfect refecting surface does have its own uses though
06:13 PM XXCoder1: like laser lens with infinite life
07:05 PM norias: hello