#garfield Logs

Aug 17 2018

12:14 AM rue_: hi kat
12:17 AM rue_: I got my 1/2" NPT die from china today!
12:17 AM rue_: works great
12:17 AM rue_: oooh, I guess the trick to doing it on a lathe is to offset the tail and workbetween centres so you get the tapes
12:17 AM rue_: taper
12:17 AM rue_: I'v changed and moved along with the constand current stepper driver, the only question in my mind now is if it will behave with the steps happening
12:17 AM rue_: and if I properly measured the average current
12:31 AM rue_: ah, zerp the feed
12:31 AM rue_: hmmm
12:33 AM katsmeow: couple good examples on yt
12:34 AM katsmeow: else, you can use a baby puter and put steppers on tool post feed and bed feed, do some maths, and adjust stepper speed ratios
12:34 AM katsmeow: or, sense bed feed and drive only the tool post
12:39 AM rue_: hmm
12:39 AM rue_: lovejoy swapout for the handwheel?
12:41 AM katsmeow: if it doesn;t loose resolution
12:41 AM katsmeow: afaik, Lovejoy makes only cushy rubber and sloppy chains-conected couplings, i'd use a solid disc coupling
12:42 AM katsmeow: stressing the positiong accuracy for this task vs high rpm and torque and bad offsets
12:44 AM rue_: should I pouint out how much backlash is in the feed itself?
12:44 AM rue_: 7 thou I think
12:45 AM katsmeow: no, don;t point that out
12:45 AM rue_: ok
12:46 AM rue_: mmm fresh coked gaerden potatoes...
12:46 AM katsmeow: coked = carbonised !?!
12:46 AM rue_: not too much
12:46 AM rue_: more cooked today
12:47 AM katsmeow: Tom prolly has a setup you can copy, like for adjusting depth of cut as the table moves around
12:48 AM katsmeow: but the bar solution can be made to work in an hour or so
12:52 AM rue_: I still need a quicklock for the tailstock and to shim up the headstock by 0.6mm
12:52 AM rue_: and the feed reverse for lefthand threading
12:53 AM katsmeow: o
12:53 AM rue_: then again, maybe a digital feed control would be a good idea
12:53 AM rue_: put an encoder on the spindle
12:53 AM rue_: so I could add that to the list
12:54 AM katsmeow: it wold be a neat trick to find/make a wound rotor to put in a 1800rpm 3phase motor and drive it as a stepper
12:54 AM katsmeow: i can pick up 1/2 - 3hp 3phase motors for $5 - $15
12:56 AM * katsmeow ponders Tom milling out the aluminum from a rotor, and milling some deeper slots for DC windings or magnets
12:57 AM katsmeow: might be easier to make a new rotor from scrap, and truing the shafter after it's made, since you could be talking relay low rpm
12:57 AM katsmeow: really
12:59 AM katsmeow: it's been done to turn a car alternator into a stepper, but the stator hasto be cut to reduce it's ID down to the rotor OD
12:59 AM rue_: dunno how they cast in the alu without brunign off the shelack from the laminations
01:00 AM katsmeow: i dunno, but as a stepper you don;t need laminations, since the rotor needs a DC field
01:00 AM katsmeow: the car alternator is a stamped thing, no laminations
01:00 AM rue_: I was unsuccessfull in operating an alternator as a stepper
01:01 AM katsmeow: i showed it worked, and the project changed
01:01 AM rue_: I could lump it along a bit
01:01 AM rue_: pretty big steps
01:02 AM rue_: iirc the stator would start to overheat
01:02 AM katsmeow: yeas, 3/8 - 1/2 inch around the circumference
01:02 AM katsmeow: current limiting was severe
01:02 AM katsmeow: needed air blower
01:02 AM * rue_ nods
01:03 AM katsmeow: but as a high torque move-a-step-and-power-down, it worked
01:03 AM rue_: then again, I ahve the ability to switch higher currents now than I did
01:04 AM katsmeow: now adaze you would prolly use a lighter hi speed stepepr and gearbox
01:04 AM rue_: yes
01:04 AM rue_: tho, there must be an advantage of that much meat
01:05 AM katsmeow: "it just works"
01:06 AM katsmeow: i remember a 1 hp sealed stepper with no blower, could see the ripples in the air above it as the heat rose, it was well above 200F
01:06 AM katsmeow: ram 24-7
01:06 AM katsmeow: raN
01:14 AM * katsmeow sssstttrrrreeeeettttcccchhhheeeessssss
01:14 AM rue_: another 7 nicks and 2 channels to register before I'm ready to go spambot hunting
01:14 AM rue_: need to get tobbor up on its feet
01:14 AM rue_: to some degree anyhow
01:14 AM rue_: need 22 tobbors
01:14 AM katsmeow: they didn;t ban *you* for spam yet with so many nicks and channels?
01:14 AM rue_: nope, I really dont think they care
01:14 AM rue_: they are all registered under different users with different emails
01:16 AM rue_: I still dont know if I can have 22 connections from one IP
01:16 AM katsmeow: had a spammer that worked at an isp, did that to different domains too, Tiggr did a tracert on people joining that she didn;t know, his route always included a few servers, and she'd just kick ban the new address
01:16 AM rue_: me and a guy are going to try to take over a botnet on the weekend, maybe I'll be able to spread it out
01:17 AM katsmeow: the joint/tracerrt/kickban sometimes took under a second
01:17 AM rue_: iiinteresting
01:18 AM rue_: k, I been falling asleep for 6 hours now, I'm going to bed
01:18 AM katsmeow: gnite
01:19 AM * katsmeow wavers gnites, and goes upstairs to see if it;s safe to work up there yet
09:57 PM rue_: did someone say something wrong?
10:24 PM Tom_L: about what to who?
10:26 PM rue_: this is quiet even for this channel
10:26 PM rue_: and thats borderline to a joke
10:26 PM Tom_L: they won
10:26 PM rue_: it looks like it dosn't it
10:27 PM rue_: wonder where zhanx and furry went
10:27 PM Tom_L: not here
10:27 PM rue_: still putting togethor my network to klobber the spammers
10:28 PM Tom_L: you're gonna be too late to the party
10:28 PM rue_: I have 18 bots registered on 20 channels
10:28 PM rue_: I'm always too late
10:28 PM Tom_L: and what good will it too anyway
10:28 PM Tom_L: do
10:28 PM rue_: people will come back
10:28 PM rue_: its where everyone good meets
10:29 PM rue_: you want to see me convert the drillpress to a cnc, right?
10:29 PM Tom_L: are there any other good networks?
10:29 PM rue_: if your a kid in a mall, what do you do if you get lost
10:29 PM rue_: cmon, whats the rule.
10:30 PM Tom_L: i dunno, the malls died too
10:30 PM rue_: you stay put
10:30 PM rue_: thats how people find you, you stay put
10:30 PM Tom_L: i went from chatjunkies to here
10:30 PM rue_: chatjunkies is a network?
10:30 PM Tom_L: that's covered a signifigant part of my life
10:30 PM Tom_L: it was, i dunno if it still is
10:31 PM rue_: the spammers ahve not succeeded in 16 years, I dont think todays their day
10:31 PM rue_: but I'll get my bot array happening for next years attack
10:32 PM Tom_L: there have been 10 stopped in #linuxcnc since suppertime
10:32 PM rue_: ok, well I'll be ready earlier than a year
10:33 PM Tom_L: it will be different then and more effective
10:33 PM Tom_L: each time they get better at it
10:33 PM rue_: not by much, its not really changed too much in the 16 years
10:33 PM rue_: someone is really obsessing over it this time tho
10:33 PM Tom_L: they must have launched something and left
10:34 PM rue_: I think its a male jobless muslim
10:34 PM rue_: who thinks that when lilo passed he should have inherited freenode control
10:34 PM Tom_L: rucas?
10:34 PM rue_: no, I saw hints online that rucas died
10:35 PM rue_: but rucas was just part of a organization of people
10:37 PM rue_: if this was partly caused by an internal spatt within freenode, it might explain why the staff have been so reluctant to do anything proper about it
10:42 PM Tom_L: you gonna get that used drillpress?
10:58 PM rue_shop4: most likey,
10:58 PM rue_shop4: I want to use it for cnc machine core, but, looking at it, its better than mine
10:58 PM rue_shop4: so I might just end up with *another* thing
10:59 PM zhanx: Internet is still down in ny
10:59 PM zhanx: Yes
10:59 PM rue_shop4: I like that you can bolt anything to anywhere on that table and line up your hole
10:59 PM rue_shop4: zhanx, due to fire?
10:59 PM zhanx: Someone appears to have dug up the fiber line
10:59 PM rue_shop4: hahah, 1 line to all of NY
10:59 PM rue_shop4: hahahah
11:00 PM rue_shop4: nice redundant network
11:00 PM zhanx: All of upstate is down
11:00 PM rue_shop4: why is there only 1 router out?
11:00 PM rue_shop4: us infastructure is a mess
11:00 PM rue_shop4: how you on?
11:00 PM rue_shop4: sat?
11:00 PM rue_shop4: wait
11:00 PM zhanx: I have no clue but Syracuse to Albany is out and everything north
11:00 PM rue_shop4: wait... wait
11:01 PM zhanx: Cell
11:01 PM rue_shop4: wait a sec
11:01 PM rue_shop4: your doing networking
11:01 PM rue_shop4: all the stores and stuff you work for REQUIRE internet
11:01 PM zhanx: Yep
11:01 PM rue_shop4: ooooh man
11:01 PM zhanx: Trust me today was fun
11:01 PM rue_shop4: they have you run of fyour feet ?
11:01 PM rue_shop4: hows the cell network working tho?
11:01 PM rue_shop4: for internet?
11:02 PM rue_shop4: want a long distance dialup?
11:02 PM zhanx: It's separate I guess
11:02 PM zhanx: No modem lol
11:02 PM rue_shop4: you must be abel to source a modem
11:02 PM zhanx: No I really don't have a modem
11:03 PM rue_shop4: the laptop has one built in
11:03 PM * rue_shop4 points to a corner of the room
11:03 PM zhanx: And my house is a faraday cage so tethering is out
11:03 PM rue_shop4: I cant see from here, so its a random corner, but
11:03 PM zhanx: No this one does not
11:03 PM rue_shop4: where is a dell?
11:04 PM zhanx: The one that did was stolen
11:04 PM rue_shop4: so are people having to learn to use paper or what?
11:04 PM zhanx: Remember druggie took my tools and stuff
11:04 PM rue_shop4: yes
11:04 PM zhanx: Phone lines
11:04 PM zhanx: I was falling over so many places today
11:04 PM rue_shop4: I know an installer in your area
11:05 PM zhanx: Same places I took the extra lines out of
11:05 PM rue_shop4: haha
11:05 PM zhanx: His name?
11:05 PM rue_shop4: john
11:05 PM rue_shop4: we call him john boots
11:05 PM zhanx: Oh I might know him
11:05 PM rue_shop4: he instsalls computer stuff
11:06 PM zhanx: Think i have his card
11:06 PM rue_shop4: ok I'm gonna solder for a bit :)
11:06 PM rue_shop4: tommorow I'll look at that bobcat (and maybe a mini excavator)
11:07 PM zhanx: Tomorrow I get to un roll over stuff
11:07 PM zhanx: It's fun
11:08 PM rue_shop4: how long do they figure its going to be out?
11:08 PM rue_shop4: all the service providers eh?
11:08 PM zhanx: Till tomorrow about 4
11:09 PM rue_shop4: from experience here, I'm gonna guess that you will get a flood of people who want to be set up with multiple service providers in failover
11:09 PM zhanx: Same ones that figured they were paying for it for nothing and had me deinstall it
11:10 PM zhanx: Most are using the incoming main line right now to due payments
11:11 PM zhanx: I wouldn't touch the fire/ems/security lines
11:11 PM zhanx: It's up!
11:12 PM zhanx_: 4 hours early!
11:12 PM rue_shop4: haha
11:12 PM rue_shop4: someone overworked to hell and paid a mint
11:12 PM zhanx_: yep
11:12 PM rue_shop4: as a few hundred uptime contracts are paid out
11:12 PM zhanx_: 19 hours of down time
11:13 PM Tom_L: gawd, what _did_ ppl do without the internet??
11:13 PM * katsmeow blinks
11:13 PM rue_shop4: call before you dig!
11:13 PM zhanx_: i worked and then mountain biked, then worked more
11:13 PM zhanx_: so i did the same today
11:13 PM rue_shop4: without the internet, I was trapped in my room, being sure I was the only one in the world
11:14 PM rue_shop4: if we all got togethor, the world really would be in for a ride
11:14 PM katsmeow: it was dialup, so i built a house while i waited
11:14 PM rue_shop4: :( thats why were spread out so far
11:15 PM Tom_L: i think i'm gonna try to order my longer Z rails
11:15 PM Tom_L: soon
11:16 PM Tom_L: so i'll have 2 pairs of extra shorter rails
11:16 PM zhanx_: no canada is spread out so far to avoid your PM and his bad jokes
11:16 PM Tom_L: and a shorter screw with no ballnut on it
11:16 PM Tom_L: so much for his uptime
11:17 PM zhanx_: no that was my phone
11:17 PM Tom_L: or was that the phone
11:18 PM katsmeow: i heard that was his phone
11:18 PM zhanx_ is now known as zhanx
11:18 PM zhanx: it was
11:19 PM rue_shop4: katsmeow, someone dug up the only fiber line to NY
11:20 PM rue_shop4: if you ask me, someone just forgot to program in the backup route
11:20 PM katsmeow: there's only one?!
11:20 PM rue_shop4: so much for 'can take a nuclear bomb attack" eh?
11:21 PM zhanx: kat not sure if there is just one, but they dug up one line and took out half the state
11:23 PM rue_shop4: kat, should I have the flyback from the steppers push to make a high voltage supply for powering the steppers?
11:23 PM rue_shop4: like a bootstrap circuit
11:23 PM rue_shop4: the more flyback you have, the higher the supply voltage gets for them?
11:23 PM katsmeow: not much voltage, you don;t wana arc the insulation in the stepper
11:24 PM rue_shop4: maybe cap it at 48V
11:24 PM rue_shop4: zener
11:24 PM rue_shop4: but the extra voltage should help the current control performance
11:25 PM rue_shop4: I wonder if you can do that with the drivers for the 3d printers?
11:25 PM rue_shop4: might have to look at the chip specs....
11:25 PM katsmeow: i doubt there it enough power to use to re-drive the stepper
11:26 PM rue_shop4: i needed to put two 5818 in parallel and they were still heating badly
11:26 PM katsmeow: prolly enough to lift the servo driver's mosfet's gate drive circuits
11:26 PM rue_shop4: thats 2A
11:27 PM rue_shop4: part of why I'm wondering if I was measuring the average current wrong
11:28 PM katsmeow: why?
11:29 PM rue_shop4: cause the ~1.5A I was supposed to be driving the motor with was causing the other big parts a lot of gief
11:29 PM rue_shop4: irfZ44 getting warm at 1.5A?
11:29 PM katsmeow: no
11:32 PM rue_shop4: @30Khz
11:32 PM rue_shop4: protected by 1N5158 diodes
11:32 PM rue_shop4: doesn't add up
11:33 PM rue_shop4: 10A pulses @ 50% duty is 5A, right?
11:34 PM katsmeow: average
11:34 PM rue_shop4: katsmeow, anything interesting going on?
11:34 PM katsmeow: i am not finding any new news about a fiber cut, lates for NY was a month ago
11:41 PM rue_shop4: https://www.timewarnercable.com/en/support/alerts/nyc-outage-alert.html
11:41 PM rue_shop4: ??
11:42 PM rue_shop4: https://outage.report/us/time-warner-cable
11:42 PM katsmeow: no date on that one
11:43 PM rue_shop4: https://mashable.com/2017/11/06/internet-is-down/#OP2ZBjinfOqg
11:44 PM rue_shop4: zhanx, did I tell you about the boom ~today in usernames turning up in the ssh attacks?
11:45 PM katsmeow: that was last November : 2017-11-06
11:49 PM zhanx: nope
11:49 PM zhanx: kat the only way found out was calling the field tech line
11:49 PM katsmeow: o
11:50 PM zhanx: i left home with no internet this morning but didn't realize it
11:50 PM katsmeow: home control apps failed ?
11:52 PM zhanx: some yes, but i was working and got a ton of calls etc
11:58 PM rue_shop4: it was so halarious the day the cell phone network went down it down for the day
11:58 PM rue_shop4: everyone wantering around waiving their phones around hoping to pick up a bar...