#linuxcnc Logs

Jan 20 2020

#linuxcnc Calendar

01:48 AM Deejay: moin
02:55 AM Loetmichel: mornin'
02:55 AM Loetmichel: *giggle* Note to coworker: The shoulder/emergency lane isnt meant to drive by the traffic jam. EVEN if you can already see the exit... Especially not if the police is also sitting in said jam... now he has 30 eur less... and thats cheap, the officer could have ticketed him 80eur ;)
02:56 AM XXCoder: lol
03:39 AM Loetmichel: *HAHA* NICE screw. want! -> https://www.isnichwahr.de/i303233-no-title-193335.html
04:52 AM jthornton: morning
04:56 AM XXCoder: yo
05:45 AM Loetmichel: *aaaah* Found the problem with the dp+3*HDMI->fiber->HDMI PC... if all 4 monitors are attached it works like a charm. IF you disconnect ONE HDMI converter power or fiber it will start to stagger and freeze if more than two are deactivated. seems Win10 doesent like any port with "cable connected but noone answering"... Now i am waiting for the customer to decide if he wants to have the
05:45 AM Loetmichel: converters dangling on the back or wants to have switches for the hotplug-detect on the three HDMI ports.
06:12 AM _unreal_: Loetmichel, the police in florida tend to ignore violators unless they have two things on them so they can arrest them...
06:14 AM Loetmichel: _unreal_: i drive the same stretch of daily traffic jam/congestion every morning... but i only use the shoulde from the point on where i can SEE every car in the que up to the exit. So far i didnt get caught ;)
06:47 AM Tom_L: morning
07:02 AM jymmmm: good morning folks
07:10 AM XXCoder: heys
07:12 AM veegee: Any tips on converting my vertical mill to a manual/CNC hybrid?
07:12 AM veegee: I'm going to go ahead and order the ball screws
07:12 AM XXCoder: yeah buy latter ;)
07:12 AM XXCoder: joking
07:12 AM veegee: I definitely don't want to buy a VMC
07:12 AM veegee: I want specifically a machine that is manual, but in the middle of a cut, I can tell it to mill an arc on demand
07:12 AM XXCoder: automatic manual
07:13 AM veegee: is that what it's called?
07:13 AM XXCoder: i donmt know if its even buyable now
07:13 AM XXCoder: no, i dont know what its called
07:13 AM XXCoder: only ever seen one
07:13 AM veegee: Well the mill itself is in perfect condition, and they have an official ball screw kit
07:13 AM veegee: it's $2,000 for the ball screws but other companies which make ball screw kits for bridgeport mills are quoting the same amount
07:14 AM veegee: might as well buy directly from the manufacturer which guarantees compatibility
07:14 AM XXCoder: expensive for me heh
07:14 AM veegee: I got full machine for $4,000 CAD including collets, a $700 vise, DRO, etc.
07:14 AM XXCoder: maybe look around for cnc'd bridgeport thats broken but have intact parts
07:14 AM veegee: I don't mind spending a couple of grand
07:15 AM veegee: I just have to figure out the specifics like where to mount the motors and how to drive the ball screws while also retaining manual capability
07:16 AM veegee: Like this: https://www.youtube.com/watch?v=ou-R44toyUs
07:17 AM Loetmichel: veegee: you can even use the acmre thread screws and CNC it
07:17 AM XXCoder: sorry but that video have been autovomit stabilized. i cant watch it
07:17 AM Loetmichel: if the threads are not badly worn
07:17 AM veegee: Loetmichel I just adjusted backlash and it's < 5 thousands
07:17 AM veegee: throughout the whole range
07:18 AM Loetmichel: then i would simply put big steppers on the manual feeds and be done with it ;9
07:18 AM veegee: and it has DRO for positioning anyway
07:18 AM veegee: does linuxcnc have the capability to use DRO output for closed loop control?
07:18 AM veegee: then backlash shouldn't matter at all
07:18 AM Loetmichel: yes, if you have a mesa card
07:19 AM veegee: really? So ballscrews not required at all? That's awesome
07:19 AM Loetmichel: it does still matter because it tends to induce some chatter/oscillation on the motors
07:19 AM veegee: oh right climb milling
07:19 AM veegee: ok I'll get the ball screws for that then
07:19 AM Loetmichel: but if its only 5 though it should be good
07:19 AM Loetmichel: thou
07:19 AM Loetmichel: doubt you would see that
07:20 AM veegee: I'm more concerned with how to mount the servos and how exactly to drive the screws without taking manual control away
07:20 AM Loetmichel: oscillation only if you use the glass readouts for closed loop though
07:20 AM veegee: why do you say that?
07:20 AM Loetmichel: if you use steppers and "dumb positioning" it wouldnt matter at all
07:20 AM veegee: you mean standard closed loop feedback oscilation?
07:20 AM Loetmichel: or servos with internal encoders
07:20 AM Loetmichel: yes
07:21 AM veegee: hmmm there must be a way to filter that out
07:21 AM Loetmichel: if you have "slack" in between your encoders and your motors that causes ociallations
07:21 AM Loetmichel: backlash isnt any different
07:21 AM veegee: the algorithm should be smart enough to compensate for backlash since it always works the same way
07:22 AM veegee: but oh well no big deal, I don't mind getting ballscrews
07:22 AM Loetmichel: the algorithm is. but it isnt runing on that low a circuit
07:22 AM Loetmichel: if you have mesa cards they directly do the PID closed loop from the glass readouts.
07:22 AM veegee: yeah that's what I'm going for
07:22 AM Loetmichel: there is no algorithm involved other than PID
07:23 AM Loetmichel: the backlash compensation is in the "pathfinding layer" in LinuxCNC IIRC
07:24 AM Loetmichel: so in your case its better to use the servos with standard encoders on the back, regulated by the mesacard or even step/dir via LPT port and have the glass readouts as an control input into LinuxCNC and dont use them for the motor feedback
07:24 AM Loetmichel: kind of a "closed loop in software above the closed loop in hardware"
07:24 AM veegee: hmmm that's certainly one way to go
07:25 AM veegee: but I really don't mind getting the ballscrews
07:25 AM Loetmichel: i know it can be done because i read about it, but i have no idea how.
07:25 AM Loetmichel: was a few versions back, too
07:33 AM veegee: Loetmichel can you link me to the Mesa card you were talking about? The one that can read the DRO scales?
07:34 AM veegee: I don't mind doing some custom hardware/software. I'm an electrical + software engineer by day
07:41 AM Loetmichel: cant remember which one.
07:41 AM Loetmichel: the developer of the mesa cards is here though
07:41 AM Loetmichel: canr remember his name at them momemt, but that should be solveable
07:41 AM Loetmichel: !mesa
07:41 AM Loetmichel: hmm
07:41 AM Loetmichel: i could have sworn we have a bot here
07:43 AM Loetmichel: http://www.mesanet.com/ <- thats the general website of themm though
07:44 AM Loetmichel: maybe mail them and tell them what you want to do and ask them to suggest a card that can do it?
07:45 AM veegee: Will do, thanks!
07:58 AM Elmo40: i really don't want to work today.
07:58 AM Elmo40: i need some excuses.
09:40 AM beachbumpete1: Mornin'
11:36 AM unterhaus: do other open source projects get people showing up on their mailing lists badmouthing the project?
11:37 AM unterhaus: I think the problem with linuxcnc is that it's open source and doesn't cost $5000. Otherwise, I have used cnc that has much worse software
11:48 AM skunkworks: can't make everyone happy...
11:49 AM Deejay: re
12:01 PM roycroft: unterhaus: all open source projects get people showing up on their mailing lists badmouthing the project
12:02 PM roycroft: the way democrats and republicans treat each other is downright courteous and friendly compared to how the various open source camps can treat each other at times
12:18 PM SpeedEvil: I would disagree, but then I think of systemd and pulseaudio.
12:19 PM roycroft: and now you just nod in agreement while grimacing
12:20 PM burklefoo: I am trying to resist responding to that thread...
12:28 PM beachbumpete1: its funny having used many different softwares over the years including quite a few different CNC controls I honestly think that LinuxCNC is pretty freaking fantastic
12:41 PM gloops: i take it someone was slating linuxcnc? lol
01:15 PM MarcelineVQ: "<unterhaus> do other open source projects get people showing up on their mailing lists badmouthing the project?" yes, absolutely
01:16 PM MarcelineVQ: That's what they're for aren't they? Move people moved on to twitter or discord to do that though :>
01:16 PM MarcelineVQ: *Most people
02:41 PM Tom_shop is now known as Tom_L
03:15 PM unterhaus: I just saw the thread in the middle because I delete things I'm not interested in. Not sure of the exact complaint
03:30 PM Jymmm: I was FINALLY able to get up on the roof. Snow melted and JUST beat the rain.
03:32 PM unterhaus: I want to go up on the roof and cap the fireplace chimney, but it's not going to happen for a while
03:33 PM Jymmm: Well, I wasn't able to sweep the chimney, but I found the spark arrester completly clogged. I was able to take a wire brush to it and get it all cleared out.
03:35 PM Jymmm: https://imgur.com/a/5C4iAFS
03:37 PM Tom_itx: that's santa's job.
03:37 PM Jymmm: Tom_itx: Only if he's a 12" midget
03:39 PM Jymmm: My only guess is that's newspaper that floated all the way up and clogged the top
04:07 PM unterhaus: my neighbor tried to talk me into a coal stove. I'm a little impressed I can'
04:08 PM unterhaus: I can't tell he's burning coal
04:08 PM jdh: clean coal! It's the future
04:15 PM unterhaus: I have been putting off getting HVAC, maybe this year
04:15 PM unterhaus: don't think my asthma could tolerate the dust from coal
04:15 PM roycroft: i'm quite certain that installing a coal stove is illegal here in oregon
04:20 PM Tom_L: they would rather you burn trees due to the abundance of them?
04:33 PM Deejay: gn8
05:02 PM _unreal_: ve7it, I'm finishing the PCB right now
05:02 PM _unreal_: just got home
05:02 PM _unreal_: doing the last of the hole drilling
05:04 PM ve7it: cool
05:04 PM _unreal_: after that I just need to switch bits and mill the excess pcb off
05:05 PM _unreal_: then I can start mounting some of the parts
05:05 PM _unreal_: that I have on hand
05:20 PM _unreal_: STUPID
05:21 PM _unreal_: let do a super slow feed rate of 20mm/m g00x0 enter SNAP! wtf
05:21 PM _unreal_: G01X0F11 arg....
05:28 PM veegee: Anyone know the approximate weight of a bridgeport motor?
05:29 PM veegee: I'm going to replace mine with a 3hp 240V 3 phase motor
05:29 PM veegee: I have an engine crane if necessary
05:29 PM veegee: But I still have to transport it from the store to my car
05:31 PM _unreal_: veegee, yes
05:31 PM _unreal_: veegee, its "heavy"
05:32 PM _unreal_: veegee, depends on the model 35-105 lbs
05:32 PM _unreal_: assume the greater
05:32 PM veegee: most 3 hp TEFC motors I can find examples of on baldor.com (https://www.baldor.com/catalog/CEM3661T) are about 100 lbs
05:32 PM veegee: that's no problem, I can carry that on my shoulder
05:33 PM veegee: But 300lbs I cannot
05:34 PM veegee: Ah yeah 105 lbs is no problem, thanks
05:34 PM infornography: <3
05:34 PM veegee: I mean it'll be fun watching the fat white dudes behind the counter bring it up from the back of the warehouse
05:42 PM _unreal_: weeewwwwhhhhh....
05:43 PM _unreal_: my cordless drill was sitting in my chair and tipped over as I sat down. some how I pressed the button a little. chuck started to spin touching my leg... that was a wake up call.
05:52 PM _unreal_: ve7it, I have started milling my second PCB
05:58 PM Loetmichel: _unreal_: quite the shock when something touches you unexpected
05:59 PM Loetmichel: isnt it?
06:09 PM _unreal_: yep
07:32 PM _unreal_: ve7it, two boards more or less done
07:32 PM _unreal_: just finishing drilling the holes on the second board
07:32 PM _unreal_: then scrap it off and prep the 3rd/final board
07:33 PM _unreal_: scrape
08:47 PM gloops: 20mm a minute lol
08:47 PM gloops: so three more sleeps to go
09:20 PM _unreal_: sleeps?
10:32 PM Elmo40: who has time to sleep?
10:35 PM norias: truly
10:35 PM Elmo40: too many projects and not enough hours in the day!
10:36 PM Elmo40: plus, it is COLD outside!
10:51 PM norias: it;s 61F in Bermuda
11:00 PM Tom_L: it's not here
11:00 PM Tom_L: 23°F, Lo 15
11:13 PM Elmo40: what is 61F in real temperature?
11:14 PM Tom_L: moderately warm
11:30 PM roycroft: about 15