#linuxcnc Logs
Aug 14 2020
#linuxcnc Calendar
12:06 AM CaptHindsight: located where?
12:12 AM CaptHindsight: what size?
12:12 AM CaptHindsight: sand cast?
12:12 AM pink_vampire: in the us
12:12 AM CaptHindsight: lost foam?
12:12 AM pink_vampire: about 12 lbs
12:12 AM pink_vampire: sand cast
12:12 AM CaptHindsight: do you have a mold and or core already?
12:12 AM pink_vampire: i can
12:12 AM pink_vampire: I can 3d print one
12:12 AM CaptHindsight: some places will do that for next to nothing
12:12 AM CaptHindsight: mold and core costs you
12:18 AM pink_vampire: what is "Billet"?
12:24 AM roycroft: it is a bar of refined or semi-refined metal in the context of casting
12:24 AM CaptHindsight: https://en.wikipedia.org/wiki/Semi-finished_casting_products
12:24 AM CaptHindsight: in silly french context it might be Bill
12:27 AM pink_vampire: I guess I will need to wait to monday and make some phone calls.
12:27 AM CaptHindsight: je m'appelle Bill
12:28 AM CaptHindsight: si je pouvais marcher de cette façon, je n'aurais pas besoin de talc
01:39 AM Raphael: morning!
04:45 AM Deejay: hi
04:58 AM Loetmichel: *hehe*, laser-cutter sure is a nice thing... i dont think i would have made those green powder coating masks THAT nice or fast by hand... Smells like hell though :-) -> http://www.cyrom.org/palbum/main.php?g2_itemId=17939&g2_imageViewsIndex=1
05:01 AM XXCoder: nice
05:10 AM JT-Cave: morning
05:14 AM XXCoder: hey
06:13 AM Tom_L: morning
06:14 AM XXCoder: hey
07:37 AM jymmmm: Good morning
09:18 AM jymmmm: This is kinda cool, but I don't get where the waveform is coming from? https://www.youtube.com/watch?v=U4-Mh-ZPI5A
09:27 AM jymmmm: Loetmichel: That's why lasers use big exhausts and vent to the outdoors or use charcoal filters =)
09:27 AM Centurion-Dan2 is now known as Centurion_Dan
09:31 AM jymmmm: Loetmichel: You think powder coating stinks, wait till you try cutting/engraving leather/rubber
09:31 AM jymmmm: Loetmichel: Mmmmmmm.... burning cowhide, yummy!!!
09:31 AM jymmmm: ...NOT!
10:23 AM jymmmm: I hear crickets
10:29 AM roycroft: are they singing "peggy sue"?
10:31 AM jymmmm: roycroft: "Under the boardwalk"
10:31 AM roycroft: so they've gone cross-genre now, eh?
11:04 AM Loetmichel: jym: its not powder coating
11:05 AM Loetmichel: that green tape is made of Polyester
11:05 AM Loetmichel: is STINKS when lasered
11:05 AM Loetmichel: its blank aluminium
11:05 AM Loetmichel: about to BE powder coated
11:06 AM unterhaus: jymmmm that inverter circuit must be bistable. Doesn't need an input waveform
11:07 AM unterhaus: I imagine it's somewhat inefficient
11:08 AM jymmmm: Loetmichel: Oh, Cause you CAN use the laser to fuse the powder coating powder and works pretty good too
11:08 AM jymmmm: unterhaus: Ah, still cool though
11:09 AM jymmmm: unterhaus: schematic near the very end of the video
11:14 AM pcw_home: A standard astable multivibrator (probably inefficient because it depends on transformer saturation)
12:47 PM Loetmichel: jym: the box wouldnt fit the laser though
12:47 PM Loetmichel: its only a 40W co2 laser cutter from china for $300
12:48 PM Loetmichel: but its sufficient to make neat "painters tape" patches for parts that shouldnt get powder coating
12:48 PM Loetmichel: jymmmm
01:24 PM CaptHindsight: Loetmichel: do you trust the powdercoater enough to have them remove the masks before baking?
01:45 PM jymmmm: Loetmichel: Ah, 40W is MORE than enough power
01:46 PM jymmmm: Loetmichel: you could probably get away with 60%
02:35 PM Loetmichel: CaptHindsight: the mask can stay on
02:35 PM Loetmichel: its polyester and good for 250°C
02:36 PM Loetmichel: jymmmm: melting tge powder is the easy part
02:36 PM Loetmichel: any elektric baking overn can do that if large enough
02:37 PM Loetmichel: the even application of said powder i give to the professionals though
02:37 PM jymmmm: Loetmichel: small pile, squeege it across, laser, pour off the rest, done.
02:38 PM Loetmichel: those boxes are expensive enough considering they are only 6. quite a bit of setup and development cost on each, meaning to have ONE redone because of a botched paintjob would be expensive.
02:38 PM jymmmm: Loetmichel: just laser it back off
02:39 PM jymmmm: Loetmichel: laser isn't gonna do anything to the alum box itself
02:41 PM jymmmm: Loetmichel: Meant to ask you.... What to you use to shield against STRONG magnetic fields?
02:43 PM Loetmichel: i dont
02:43 PM Loetmichel: all fields i have to care are AC
02:43 PM Loetmichel: +about
02:43 PM Loetmichel: so a faraday cage is good enough
02:44 PM Loetmichel: static magnetic fields the only chance is: be far away or use mu-metal if possible
02:44 PM jymmmm: Loetmichel: WTH kind of snake oil you sell'n over there ;)
02:44 PM Loetmichel: i am selling nothing
02:44 PM jymmmm: s/selling/making/
02:44 PM Loetmichel: the company i work for sells shielded systems against eavesdropping (van-eck-prheaking)
02:45 PM Loetmichel: aka "top secret" IT tech
02:45 PM jymmmm: s/top secret/porn collection/
02:45 PM Loetmichel: you cant transmit data with a static field
02:45 PM Loetmichel: i doubt that anyone that "needs" porn is able to buy those systems
02:46 PM Loetmichel: :-)
02:46 PM Loetmichel: they are EXPENSIVE
02:46 PM jymmmm: lol
02:46 PM Loetmichel: ... had a nice laugh today: boss sold a bunch of notebooks a year ago for $13k each...
02:47 PM Loetmichel: to a middleman which sold them to the german army.
02:47 PM Loetmichel: this week two came back for repairs. Insurance "goods value" sheet said: $36k each.
02:48 PM Loetmichel: THATS a nice markup for shoving some boxes from one desk to the other ;)
02:48 PM jymmmm: Like I said... snake oil
02:48 PM Loetmichel: i meant the value for insurance on the packaging.
02:49 PM Loetmichel: for the delivery carrier
02:49 PM Loetmichel: hmm?
02:50 PM Loetmichel: no, they ARE shielded. and yes, you CAN reconstruct a TFT display contents solely by picking up EM signals from 100m away. i have seen it done.
02:50 PM Loetmichel: with a standard TFT monitor of course, not our equipment ;)
02:51 PM Loetmichel: as far as i know the definition of snake oil is a product with no function. so thats a nome from here.
02:51 PM Loetmichel: i doubt that any non-paranoid civillian has a use for it though
02:52 PM Loetmichel: last i looked the tech to do that feat from that far away is in the millions.
02:52 PM Loetmichel: not viable for some scammers and stuff
02:52 PM jymmmm: $13K each + $5K markup = $18K *2 laptops = $36K
02:52 PM Loetmichel: nope, $36k EACH
02:52 PM jymmmm: lmao, they are HOPING you guys lose/destroy them =)
02:53 PM Loetmichel: we have built them
02:53 PM Loetmichel: no chance ;)
02:54 PM Loetmichel: the middleman was surprisingly well behaved when we told them that the repair will take a while because not enough workers... i think i can guess why now ;)
02:55 PM jymmmm: whats the repair?
02:56 PM Loetmichel: one dead battery (dropped to less than 1V per cell) and one dead rj45->fiber converter (cold solder joints)
02:57 PM Loetmichel: nothing really wild
02:57 PM jymmmm: ah
02:57 PM jymmmm: Loetmichel: and the cost of the repairs?
02:57 PM Loetmichel: zero
02:57 PM jymmmm: oh warranty work
02:58 PM Loetmichel: still under warranty for half a decade ;)
02:58 PM jymmmm: you warranty a LAPTOP for 5 years?!
02:58 PM Loetmichel: six if i remember correctly
02:58 PM Loetmichel: military customers and stuff
02:59 PM Loetmichel: we have servers that just went out of warranty last year for a customer... 15 years after we made that series
02:59 PM Loetmichel: :-)
02:59 PM jymmmm: Loetmichel: onsite repairs?
02:59 PM Loetmichel: on that 15 years contract: yes
03:00 PM jymmmm: how many times to you get stripe searched?
03:00 PM Loetmichel: sometimes
03:00 PM Loetmichel: not stripe though
03:00 PM Loetmichel: but its not that unusual to get a pat down at the gates
03:00 PM Loetmichel: was there a few times repairing the damn systems
03:00 PM jymmmm: Yeah, I know =)
03:01 PM jymmmm: Loetmichel: With M16 escort =)
03:02 PM Loetmichel: but honestly: the guards usually dont know what half the stuff in my toolbox does... i could have smuggled stuff in there by the dozen if i wanted.
03:02 PM Loetmichel: s/toolbox/spare part box
03:02 PM jymmmm: Loetmichel: So nobody with a clue of you swapping hdd's ?
03:02 PM Loetmichel: more like G36 here in germany ;)
03:03 PM Loetmichel: jym: i dont get the HDDs to see ever again after delivery
03:03 PM Loetmichel: they ALL are in swap carriers and get stored in a safe for the night/repairs
03:03 PM Loetmichel: i have to bring my own boot media
03:03 PM jymmmm: ah, ok
03:04 PM jymmmm: Loetmichel: so all you ever see is a empty unpopulated server chassis?
03:05 PM jymmmm: Loetmichel: They don't use RAID?
03:05 PM jymmmm: or arrays?
03:05 PM Loetmichel: they do
03:05 PM Loetmichel: but all i get to see is empty chassis, yes
03:06 PM Loetmichel: fun fact: most HDD manufacuters allow you to send in only the top lid with the serial number of a HD to get a replacement when you utter the magical words: "military contract" ;)
03:07 PM Loetmichel: at least that happend a couple times in the last 10 years
03:07 PM Loetmichel: to me
03:07 PM Loetmichel: because thats all we got back from the customer ;)
03:07 PM Loetmichel: you have to fill a form that the disk is failed and they belive you ;)
03:10 PM jymmmm: lol
03:10 PM jymmmm: Ok, Wwhere the hell is pin 1? https://www.marthel.pl/katalog/Betlux/BL-T52A-31.pdf
03:12 PM Rab: jymmmm, pin closest to the first decimal point. It's called out on page 3.
03:14 PM jymmmm: Rab: where do you see that callout?
03:14 PM jymmmm: Oh I see it now, damn
03:18 PM jymmmm: So bottom left (BL) is pin 1-6 (BR), then horseshoe around to the other side and pin 7 is TR, then TL is pin 12, I guess
03:19 PM jymmmm: Rab: thank you =)
03:20 PM Rab: jymmmm, shore!
03:35 PM Deejay: gn8
06:22 PM Thorhian_: How's it going?
06:33 PM Tom_L: good
08:59 PM jymmmm: 1K5 = 1500 ohms?
09:00 PM Tom_L: yessir
09:02 PM jymmmm: Tom_L: Danka
09:03 PM jymmmm: Well, I ordered my 12V60A PS's
09:04 PM jdh: that's a lotta 12v
09:04 PM jymmmm: Yeah, hopefully more than enough once I mod them
09:06 PM jymmmm: I'd like to charge these batteries in 6 hours
09:07 PM jymmmm: instead of 14 hours
09:07 PM jymmmm: The PS were CHEAP, 2 for $18 shipped
09:08 PM jdh: https://www.tesla.com/powerwall
09:10 PM jymmmm: Too expensive. These LiPo cells can accept a 100A charge, and can continously draw 200A, peak to 400A for a coule of seconds
09:11 PM jymmmm: so a 50A charge should be "safe"
09:13 PM Tom_L: it has to be 12v?
09:13 PM jymmmm: The LiFePo4 cells I'm also considering have a recommended charge rate of 1ooA
09:13 PM Tom_L: 13.4 is too much?
09:14 PM jymmmm: Tom_L: No, needs to be stepped up to 16.8V (4S) for the LiPo's
09:14 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/misc_stuff/12v_supply3.jpg
09:14 PM Tom_L: oh
09:15 PM jymmmm: and 14.6V for the LiFe cells
09:15 PM Tom_L: that's an rv charger
09:16 PM jymmmm: Tom_L: But needs that CC/CV two-part charge cycle
09:17 PM jymmmm: Tom_L: Well, at least if I don't want to abuse and shorten their life that is
10:05 PM roycroft: well our forecast has been dialed back
10:05 PM roycroft: it's calling for a high of only 39 tomorrow
11:10 PM veegee: I love copper pipes
11:10 PM veegee: soldering is so much better than threaded connections
11:10 PM skunkworks: as long as you clean them well...
11:11 PM veegee: very easy to do
11:11 PM veegee: If only copper were cheaper
11:12 PM veegee: Until then, galvanized pipe and retheading every pipe and fitting with a tap and die will have to do
11:13 PM veegee: and air line filters all over the place to deal with zinc flakes coming off
11:13 PM jymmmm: veegee: , Uh... try soldering copper pipes when there is a microdrip sometime.... NOT GONNA HAPPEN
11:13 PM veegee: not for water, silly
11:14 PM veegee: for air
11:14 PM jymmmm: veegee: What, BEER?
11:14 PM jymmmm: ah
11:14 PM veegee: but you can do it with a TIG torch
11:14 PM jdh: we have 1/2" copper helium & argon lines at work in some sections.
11:14 PM jymmmm: and how many plumbers you see carry a TIG?
11:15 PM veegee: jdh what are they pressurized to?
11:15 PM jymmmm: jdh: Ever filll up baloons and then breath it in?
11:15 PM veegee: and are they K, L, or M?
11:15 PM jymmmm: N
11:15 PM jdh: no letters high enough
11:15 PM jdh: tanker trucks
11:16 PM veegee: jdh so even thicker wall than K?
11:16 PM veegee: do you know how thick and what pressures they're running?
11:16 PM jdh: the outside ones are
11:16 PM jdh: only 105 I think inside the building
11:17 PM veegee: 105 what?
11:17 PM jdh: ran new stainless ones to get higher pressures inside
11:17 PM jymmmm: PSI
11:17 PM jdh: psi. what else is there
11:17 PM veegee: bar
11:17 PM jdh: how quaint. people still use metric?
11:18 PM jymmmm: pascal, Kpa
11:18 PM veegee: anyone not in the shithole freedumb country known as murica
11:18 PM jymmmm: jdh: haha, high five
11:19 PM veegee: there's also kg/cm^2
11:19 PM jdh: though I actually had no idea what you were talking about. The only helium/argon K, M I have heard of were old cylinder sizes
11:19 PM jymmmm: Wanna see a 220V lightbulb powered by a single AA battery?
11:19 PM veegee: jdh K, L, M are copper pipe wall thickness grades
11:20 PM jymmmm: https://www.youtube.com/watch?v=PUjaSYpyF6k
11:20 PM jdh: learn things all the time!
11:23 PM veegee: So I broke down and bought this: https://www.amazon.ca/Ingersoll-2235TIMAX-Drive-Impact-Wrench/dp/B00LV9Y1FE
11:24 PM veegee: It's an absolute monster
11:24 PM veegee: I couldn't take off a lug nut on my friend's shitty old car with a 1m long breaker bar
11:24 PM veegee: but this thing took it off in less than 2 seconds
11:24 PM veegee: Apparently it's the most powerful 1/2" air impact right now
11:25 PM veegee: Also bought this https://www.amazon.ca/Ingersoll-Rand-2025MAX-Impact-Wrench/dp/B003UM8VV0 (when it was only $300) and super useful for getting into tight spots
11:28 PM veegee: god damn mechanics never use torque wrenches. They think they're too good for that
11:28 PM veegee: that's why they're mechanics and not engineers I guess. I never let one near my car or motorcycle. They over torque the shit out of everything
11:29 PM veegee: all the brake caliper bolts on his car were torqued so tight that they were stretched, so well past their yield strength.
11:30 PM veegee: and they're NOT torque-to-yield bolts that's for damn sure
11:39 PM jdh: they don't need to, they have impact wrenches
11:57 PM veegee: Yeah fucking retarded pieces of shit
11:57 PM infornography: wut
11:57 PM veegee: that's willfully destroying customer's property
11:58 PM veegee: infornography retarded wrench monkeys using impact wrenches to assemble brake caliper bolts with an impact wrench
11:58 PM infornography: We have a "Use the impact on everything" guy at work
11:58 PM veegee: yeah punch him in the face
11:58 PM veegee: get him fired
11:58 PM veegee: impact is only for disassembly
11:59 PM veegee: assembly, never use impact (reactionless air ratchet doesn't count) and _always_ torque bolts to engineering spec
11:59 PM veegee: They even provide the torques in the service manual