#linuxcnc Logs

May 30 2020

#linuxcnc Calendar

12:33 AM veegee: XXCoder noise is not a concern
12:38 AM XXCoder: either is it for me :D but had to make sure :)
12:38 AM veegee: I sleep better with white noise anyway
12:38 AM veegee: It drowns out the subtle variations in the environment and makes it consistent
12:38 AM veegee: I always have an air purifier running next to me while I sleep. Makes a pleasant sound and cleans the air
12:38 AM veegee: Ok so now I have this problem
12:38 AM veegee: I made a mistake and I have to move a bunch of boxes out of my storage unit before 8am
12:38 AM veegee: it's currently 1:26am
12:38 AM veegee: I thought the move out date was tomorrow, but it's actually now
12:38 AM veegee: And I'm suuuuppppper tired
12:38 AM veegee: If I don't move everything out, I have to pay for another month
12:38 AM XXCoder: ouch not great
12:38 AM veegee: I have a bunch of pallets and a truck with a lift gate
12:38 AM jymmmm: veegee: Eh, get the coffee going and just stay up all night
12:38 AM veegee: all the items are personal stuff and relatively light, but I just finished moving heavy machinery
12:38 AM veegee: jymmmm I have a genetic defect for caffeine processing, can't do coffee
12:38 AM veegee: All I need is like one person to help me
12:39 AM jymmmm: what time does the stoage open?
12:40 AM veegee: 9 am is when the employees get in
12:40 AM veegee: so as long as it's cleared out by then, no one will notice and it's all good
12:40 AM jymmmm: oh, so you cna go there now?
12:40 AM veegee: yes
12:40 AM veegee: I'm just super tired and sore from moving a whole bunch of other stuff
12:40 AM veegee: for the past 12 hours
12:41 AM veegee: I can do it solo if I weren't dead tired.
12:41 AM jymmmm: Think you cna find someone at dawn/5am?
12:41 AM veegee: Yeah I'm going to try
12:41 AM jymmmm: are you in the US?
12:41 AM veegee: Toronto
12:42 AM jymmmm: Try craigslist?
12:42 AM veegee: alternatively, I could go to the local mcdonalds and present the same offer
12:42 AM veegee: To the staff
12:43 AM jymmmm: maybe, how much is another month rent?
12:44 AM veegee: $700 CAD, it's a 200 sq ft climate controlled indoor unit
12:44 AM jymmmm: You don't have till the END of the month?
12:44 AM veegee: It's the last day of your billing cycle
12:44 AM jymmmm: ah
12:45 AM veegee: I'll figure something out
12:45 AM veegee: a nap usually does the trick
12:45 AM jymmmm: Set at least two alarms, seriously
12:45 AM veegee: Oh yeah I always do
12:45 AM jymmmm: one WAY out of reach
12:45 AM veegee: Like 3 or 4 spaced minutes apart
12:46 AM veegee: LUckily I have pallets and 2 pallet jacks and a liftgate truck
12:46 AM veegee: just have to tough it out I guess
12:46 AM jymmmm: Eh, grab abite to eat, suck it up, go now, and pass out tomorrow
12:47 AM jymmmm: maybe take a shower now too, to help wake up
12:47 AM veegee: Yeah you're right. The army ranger school is a million times worse for 60 days
12:48 AM veegee: But sadly, I wasn't born with the genes of an army ranger
12:48 AM veegee: It blows my mind how people survive ranger school
12:51 AM veegee: Oh right, forgot I have amphetamine. That'll do the trick
12:53 AM jymmmm: haha
01:50 AM Deejay: moin
04:51 AM Deejay: re
05:02 AM JT-Cave: morning
05:03 AM XXCoder: hey jt
05:09 AM JT-Cave: I got the job to automate the spoke lathe https://images.wisconsinhistory.org/700003050024/0305000576-l.jpg
05:10 AM JT-Cave: that's the same type I'm going to automate
05:10 AM XXCoder: ya i remember that
05:10 AM XXCoder: how goes it
05:10 AM XXCoder: oh it was talk and now its offically a job?
05:10 AM JT-Cave: yea got a call from the owner yesterday and he accepted my quote
05:11 AM XXCoder: thats good :)
05:11 AM JT-Cave: should be lots of fun
05:13 AM XXCoder: i guess heh not in engineering automation type professional job
05:15 AM XXCoder: im not sure what I can do thats more desk type job
05:16 AM XXCoder: or what I would like to do more
05:16 AM XXCoder: I do like machinist job but it wont last forever
05:20 AM JT-Cave: stupid web pages all want to use your location but the millions of rural folks on satellite the location is not even in the same state lol
05:20 AM XXCoder: lol
05:21 AM XXCoder: i usually dont see any reason to allow that
05:21 AM XXCoder: only makes sense on location context stuff
05:21 AM XXCoder: like searching for store location
05:21 AM JT-Cave: yea
05:22 AM JT-Cave: or looking for a restaurant or hotel near your location
05:22 AM XXCoder: yeah
05:22 AM JT-Cave: wow I have 3.6 GB of data left over for the month
05:23 AM XXCoder: if you want silly hardware project: https://www.youtube.com/watch?v=DBI1H7KUqE0&feature=em-uploademail turns 3d printer into 2d printer
05:24 AM XXCoder: before you ask, no its not "face" type
05:33 AM Tom_itx: morning
05:34 AM XXCoder: hey tom
05:39 AM Tom_itx is now known as Tom_L
05:55 AM * JT-Cave puts on his chicken tender hat as it's sunrise and time to clean poop
06:23 AM _unreal_: you can all rest easy I am awake :)
07:01 AM unterhaus_: that 2d printer reminds me of something I saw in the back room of a surplus store. They had gotten a prototype inkjet head. It was huge, probably 3' square
07:02 AM unterhaus_: this would have been 1984 or so
07:03 AM unterhaus_: my guess is they moved the paper
08:01 AM JT-Cave: https://gnipsel.com/images/chickens/feeder/feedermk3/
08:38 AM jymmmm: good morning
08:59 AM pcw_home: unterhaus_ inkjet printers a quite old, AB Dick had them in the 1970s
09:01 AM pcw_home: I think the first ones use electrostatic deflection of a a single ink stream
09:05 AM jymmmm: pcw_home: Most don't know who AB Dick is. I used their presses, but never knew they made printers
09:07 AM pcw_home: I saw a 1970s vintage one in a surplus place "A.B. Dick Videojet"
09:11 AM jymmmm: AB Dick 360 dual head was a great press, you could print anything from paper, cardstock, envelopes, invitations, etc
09:12 AM jymmmm: But completely old school... metal plates that you had to develop after shooting with camera, etc
09:15 AM unterhaus_: the inkjet I saw might have been from NCR, although they had a deal with Mendelsons and this was at a different surplus dealer
09:17 AM unterhaus_: This thing was color, had an octopus of ink tubes. Too bad we didn't have cellphones to take pictures with back then
09:18 AM jymmmm: unterhaus_: Yeah, we had cameras back then
09:25 AM unterhaus_: film cameras, I never owned one that I can remember
09:26 AM jymmmm: polaroid?
09:26 AM unterhaus_: when did they invent disposable cameras? I had a couple of those
09:27 AM unterhaus_: now that you mention polaroid, that might have been where the printer was from. Or maybe Kodak
09:51 AM skunkworks: we have some burroughs accounting machines. ferrite core memory and everything
09:58 AM skunkworks: had
09:58 AM skunkworks: had some
10:02 AM jymmmm: skunkworks: Oh you know you HAVE them and they are working ;)
10:17 AM Tom_L: jymmmm, was he related to Moby?
10:17 AM jymmmm: Tom_L: maybeeeee =)
04:10 PM Deejay: gn8
04:29 PM skunkworks: hmm - was only spinning the spindle motor at almost 7000 rpm...
04:30 PM skunkworks: so I probably am saturizing the motor
04:44 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Snapper/Knob2.jpg
04:44 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Snapper/Knob3.jpg
04:45 PM Tom_L: broken plastic knob replacement for the mower
04:48 PM skunkworks: If all you have is a hammer...
04:48 PM skunkworks: :)
04:49 PM skunkworks: Tom_L: neat - what did you model it in?
04:51 PM Tom_L: smartcam
04:51 PM Tom_L: the one i always use
04:52 PM Tom_L: the chamfer on the bottom is too big and i couldn't figure out a way to chamfer the bottom od without hitting the vise jaws
04:52 PM Tom_L: it would have been done before the profile
04:53 PM Tom_L: i could cut another profile in the softjaws and get it but meh
04:55 PM skunkworks: it is a knob.. :)
04:55 PM Tom_L: yeah but once you start something....
05:03 PM skunkworks: I am not the only one that has that problem?
05:13 PM roycroft: hi folks
05:13 PM roycroft: i found out today why the conveyor on my drum sander is so difficult to adjust
05:13 PM roycroft: this timing gear: https://www.roycroft.us/Timing-Gear1.jpeg
05:13 PM roycroft: actually is this: https://www.roycroft.us/Timing-Gear2.jpeg
05:14 PM roycroft: any ideas on how to repair that?
05:14 PM roycroft: the part is NLA
05:14 PM roycroft: it is threaded inside and out
05:14 PM roycroft: it needs to be a pretty strong repair
05:14 PM roycroft: i don't know if brazing and then thread chasing would do the job
05:14 PM Tom_L: brazing or silver solder
05:14 PM roycroft: i don't think it's a part i would want to try to make
05:15 PM roycroft: or have someone make - it would probably cost several hundred dollars to have one custom made
05:15 PM Tom_L: can't order one?
05:15 PM roycroft: no, NLA for quite a while
05:15 PM roycroft: the machine is a good 20+ years old
05:15 PM roycroft: it kind of works now, even though it's broken
05:16 PM roycroft: which is why i was thinking that brazing might be sufficient
05:16 PM roycroft: and it seems you think so too
05:16 PM roycroft: if it gets a little goobered up from the brazing job i can clean up the threads after
05:16 PM Tom_L: doesn't matter what i think. i don't know much about it
05:17 PM roycroft: tig welding by someone who knows what they are doing would be the strongest repair
05:17 PM Tom_L: must be under some load or it wouldn't have broken
05:17 PM roycroft: i don't think my tig welding skills are up to par to do that though
05:17 PM roycroft: but it would not cost that much to job out a tig weld repair
05:17 PM roycroft: it's a timing gear for a conveyor table
05:18 PM roycroft: there are four of those gears, synchronized with a timing belt
05:18 PM roycroft: the conveyor table weighs maybe 30-35kg
05:18 PM andypugh: Looks like a simple enough thing to make with the Power Of LinuxCNC!
05:18 PM roycroft: but all of the timing gears and their bearings were all gummed up - packed with sawdust and barely functioned
05:19 PM roycroft: sure, but i need this before i'll ever be able to finish my mill conversion
05:19 PM roycroft: do you want to make one for me? :)
05:19 PM Tom_L: nope
05:19 PM roycroft: send me a quote and i'll send you the cash
05:19 PM Tom_L: what's the od on the hex?
05:19 PM roycroft: if the quote is reasonable, of course
05:20 PM andypugh: I assume from where it broke that whatever goes in the internal thread doesn’t go full depth.
05:20 PM andypugh: So you might be able to loctite a small portion of thread in where the break is.
05:20 PM Tom_L: i wouldn't have a good way to make the gear teeth
05:21 PM roycroft: 1.875" across the flats
05:21 PM roycroft: the internal thread *does* go full length
05:21 PM andypugh: You could get close with the teeth by drilling a circle of holes prior to turning on the lathe.
05:21 PM roycroft: the timing gears have support rods that are fixed to the conveyor table
05:21 PM roycroft: the gears spin to raise and lower the table on those rods
05:22 PM roycroft: https://www.ereplacementparts.com/delta-31250-type-drum-sander-parts-c-3275_3512_3539.html
05:22 PM roycroft: there are exploded diagrams of the machine
05:23 PM roycroft: it's part #62
05:23 PM andypugh: Is the hex important?
05:23 PM roycroft: no
05:23 PM _unreal_: ve7it, hello
05:23 PM roycroft: not at all
05:23 PM roycroft: it's only there to grab onto with a wrench when adjusting the bearing cap
05:24 PM _unreal_: ve7it, if I get around to it tonight I may power up the boards
05:24 PM roycroft: and to keep the timing belt from slipping down
05:24 PM roycroft: something needs to be there for that
05:24 PM andypugh: It looks like the hex fits in to part 61
05:24 PM roycroft: but on this particular part, there's another gear that bolts to the bottom
05:24 PM Rab: roycroft, is that brass, or bronze?
05:24 PM _unreal_: ve7it, I'll likely use a tiny 300ma 12v brick
05:25 PM roycroft: it's steel as far as i can tell
05:25 PM roycroft: blackened steel
05:25 PM roycroft: andypugh: that's another gear
05:25 PM roycroft: and i could easily make a hex-shaped plate to bolt between that gear and the broken gear
05:25 PM roycroft: to replicate the original part as closely as possible
05:26 PM andypugh: Yes, 61 is a bevel gear that drives the part in question.
05:26 PM roycroft: but the hex plate does not need to be integral to the timing gear
05:26 PM roycroft: right
05:26 PM roycroft: that bevel gear connects to the shaft on which the adjuster handwheel is mounted
05:26 PM Eric__: are you sure it's something that can be welded/brazed?
05:26 PM Tom_L: roycroft,
05:26 PM Tom_L: i can make you one for $39 plus shipping
05:26 PM roycroft: i'm not sure about anything except 1. it's broken, and 2. it's NLA
05:26 PM Tom_L: https://www.toolpartsdirect.com/bd-406130510004-timing-gear.html
05:26 PM roycroft: that's the part number
05:27 PM Eric__: I broke the handle on my tablesaw fence and when I tried to braze it, it melted like wax
05:27 PM roycroft: that site told me it's NLA
05:27 PM roycroft: and still says that
05:27 PM Tom_L: nevermind
05:27 PM roycroft: "this part is obsolete and out of stock. we can no longer sell this part."
05:29 PM Rab: roycroft, if it were me, I'd copy the ID/OD threaded nose, bore out the gear part, and pin or braze the nose piece in place. Maybe even add a flange to the nose, if it'll fit.
05:29 PM roycroft: it is magnetic
05:29 PM roycroft: that might be a plan, rab
05:29 PM Eric__: I think that means you can braze it, which is what I would try first
05:29 PM roycroft: a better one than just trying to braze/weld/solder the part back on
05:29 PM andypugh: What is the external thread?
05:30 PM roycroft: i haven't measured it
05:30 PM roycroft: one moment
05:31 PM andypugh: A modification of Rab’s idea would be to bore out the centre, tap to the thread and screw in a sleeve with matching ID and OD.
05:31 PM andypugh: (Fix with high-strength Loctite)
05:31 PM Rab: The failure may indicate stress cracking between the two sets of threads, not limited to the failure point.
05:32 PM andypugh: Or silver solder.
05:32 PM andypugh: I suspect that it’s a sintered part.
05:32 PM _unreal_: BS covid thing delaying my damn china parts SOOOO bad
05:33 PM andypugh: The teeth with no run-out point to die-casting or press-sintering.
05:33 PM Rab: Yeah, the picture on the ToolParts site kinda has a pitted appearance
05:33 PM _unreal_: I'm still waiting for my liner bearings and my new spindle motor
05:33 PM roycroft: ok, it just got interesting
05:33 PM roycroft: inside thread is 1/2"-16
05:33 PM roycroft: really
05:33 PM roycroft: and outside is 3/4"-16
05:34 PM roycroft: unusual sizes
05:34 PM roycroft: and i do not have a 1/2-16 tap
05:34 PM roycroft: i have 1/2-13 and 1/2-20
05:35 PM roycroft: oh, a 1/2-16 tap is not that expensive
05:36 PM roycroft: and there is nothing "bs" about covid-19, btw
05:36 PM roycroft: and that's all i'm gonna say about that :)
05:36 PM roycroft: the part itself is very smooth, except the break is quite rough
05:36 PM roycroft: it's a "grainy" break
05:37 PM roycroft: like how a knife breaks when the heat treatment is poor
05:38 PM Rab: 16tpi inside and outside, that's asking for it to shear. But maybe the travel needs to be the same for both.
05:38 PM roycroft: it actually shouldn't
05:38 PM roycroft: the outside is just for the bearing cap
05:38 PM roycroft: once the cap is adjusted nothing needs to move there
05:39 PM roycroft: the entire timing gear rotates on the support pillar
05:40 PM Rab: Is that lighter-colored ring in the photos where the inner race sits?
05:41 PM _unreal_: ! CRAP I just realized I asked a question got the answer and forgot to write it down. ok 27,000 mF cap 24v, looking for a resistor value to bleed it off in 60 seconds to two minuets
05:41 PM _unreal_: eric if it melted then you had your flame WAY to high
05:41 PM roycroft: the inner race of the bearing fits around the unthreaded part of the shaft just above the gear
05:42 PM roycroft: so yes, that's where the inner race sits
05:43 PM roycroft: the outer race is sandwiched between two flanges that bolt to the base of the machine
05:43 PM roycroft: and it looks like 3/4"-16 dies are fairly inexpensive
05:44 PM roycroft: but that's kind of irrelevant, as i feel pretty comfortable cutting outside threads on the lathe with a single point tool
05:44 PM roycroft: i don't feel so good about cutting inside threads, especially that small
05:44 PM roycroft: i'd need a very long, very thin boring bar
05:45 PM roycroft: and more skill than i believe i possess at this point
05:46 PM roycroft: i suppose i could attempt a repair with silver solder or brazing, and if that fails i could still bore it out and braze a new piece in
05:47 PM roycroft: this does not need to be really high precision - the part rotates at about 1/8 rpm when it moves at all :)
05:47 PM roycroft: well, maybe a bit more than that
05:47 PM roycroft: but rarely more than 1/8 of a turn at a go
05:49 PM roycroft: although the break surface is very grainy, it's a very clean break
05:49 PM roycroft: no gaps at all
05:49 PM Tom_L: i would certainly take good measurements in case you do end up having to make one
05:49 PM roycroft: yes
05:49 PM roycroft: i suspect what happened is a previous owner tightened down the bearing cap screw too much
05:50 PM roycroft: there are signs of a previous owner having no idea how to maintain/adjust the machine all over the place, which is one reason i've disassembled it completely for a refurbishment
05:50 PM roycroft: i have to "undo" a lot of work that a previous owner did and do it correctly
05:52 PM roycroft: the conveyor support system is an interesting design
05:52 PM roycroft: this one timing gear, to which the adjustment bevel gear is attached, is the only rigid gear on the support system
05:53 PM roycroft: the other three float in sperical holders, so they can auto-align
05:53 PM roycroft: spherical
05:54 PM roycroft: the sanding drum itself is supported that way as well - one side has a cylindrical bearing, the other end has a spherical bearing
06:11 PM andypugh: _unreal_: The time constant of an RC circuit is just that, R x C.
06:13 PM andypugh: R is volts per coulomb per second, C is volts per coulomb. So R x C = seconds.
06:37 PM jymmmm: e=mcHAMMER^2
06:37 PM jymmmm: ...the theory of parachute pants
06:38 PM andypugh: Actually, E=mc2 is a good example of the same kind of dimensional analysis.
06:41 PM andypugh: m = kg, c = m/s. mc^2 = kg m^2 / s^2 m = F / a so kg = N / m/s^2 so mc^2 = N x m = joules of energy.
06:41 PM jymmmm: N being?
06:42 PM jymmmm: Newtons?
06:42 PM andypugh: ie, if you know that some things are related, you can work out what the actual equation is by making the units work. (And guessing where you might need a Pi)
06:42 PM andypugh: Yes.
06:43 PM andypugh: It works in Imperial too, but you have more constants to guess.
06:44 PM _unreal_: ve7it, you live?
06:45 PM jymmmm: See, in all that, the pondering I have is, why do we square (or cube) things so much (other than 'area')?
06:48 PM andypugh: you cube where it’s about volume.
06:49 PM jymmmm: I have this theory... We use numbers to describe (not to define) shapes, just like we use ABC's to describe words,writing/reading, etc (in a sense)
06:50 PM andypugh: The interesting question is _why_ maths can describe physical processes. It doesn’t feel like it _had_ to.
06:52 PM jymmmm: Well, if we understood "shapes" (lack of better word), then we wouldn't need maths, thus the theory.
06:54 PM jymmmm: It's like going faster than the speed of light, it's not that we can't go faster, we just run out of energy/fuel before getting there.
06:54 PM andypugh: Maybe we need to start from the other side.
06:54 PM jymmmm: The other side?
06:55 PM andypugh: Slow down to the speed of light
06:55 PM jymmmm: aren't we there now? lol
06:56 PM jymmmm: other than RF that is
06:58 PM andypugh: Light moves slower than the speed of light, on average.
06:59 PM jymmmm: due to space dust and other resistances
06:59 PM andypugh: That’s one of those statements like “You have more than the average number of legs”
07:00 PM jymmmm: Tri-ped might be cool =)
07:02 PM jymmmm: andypugh: And how does light move slower if it's not resistances?
07:03 PM andypugh: It moves slower than c in anything other than a vacuum.
07:03 PM jymmmm: OH, I forgot the vacuum thing
07:03 PM t4nk_freenode: lol
07:03 PM t4nk_freenode: it will always move at c though :)
07:03 PM jymmmm: 186,000 miles per sec... in a vacuum
07:04 PM _unreal_: sigh
07:04 PM jymmmm: vacuum's suck, mkay
07:04 PM _unreal_: was hoping ve7it would be on
07:04 PM _unreal_: so I could ask him some Q's
07:05 PM jymmmm: cq cq cq dx
07:05 PM andypugh: The internet says that the slowest ever recorded speed of light is 38mph.
07:05 PM _unreal_: ?
07:05 PM andypugh: https://abcnews.go.com/Technology/story?id=99111&page=1
07:07 PM _unreal_: interesting
07:08 PM _unreal_: So I guess I'm looking at about 2.4kohm 1/4 watt resistors for my 27000uF caps to drain them
07:08 PM _unreal_: to empty them 90% in a little over 2min
07:08 PM jymmmm: Heh, I have a 1 second fiber optic delay. It's like a mile long coil of fiber optic cable. Though I'm not sure why they exist.
07:09 PM andypugh: 1 second?
07:09 PM _unreal_: only a mile?
07:09 PM jymmmm: I'd have to pull it out, it's been a while
07:09 PM _unreal_: must be other aspects to it
07:10 PM andypugh: _unreal_: P = V^2 / R,  so yes, 1/4W should be fine.
07:10 PM _unreal_: because hehe even cheap fiber will transmit a lot of data WELLL over a mile at light speed
07:10 PM _unreal_: I dont care if it takes 2min
07:10 PM jymmmm: I bught it for the 19" alum chassis it was in =)
07:10 PM andypugh: maybe 1 µS
07:10 PM _unreal_: I just want to ensure that its going down
07:11 PM _unreal_: 1us sounds more like it
07:11 PM jymmmm: IDK, it's just a BIG ASS COIL of fiber optic cable inside
07:12 PM _unreal_: ARG... I wanted to talk to ve7it about connecting to the serial and how to update settings
07:26 PM skunkworks: it takes about .5 seconds for a round trip to a geosynchronous
07:27 PM pcw_home: ~1.5 refractive index cable would be about 8 uS/mile
07:27 PM skunkworks: sat
07:27 PM skunkworks: (36k kilometers)
07:29 PM _unreal_: pcw_home, just got all but the Z that is not built yet. limit switches done
07:29 PM _unreal_: just need to get the connection cable finished
07:29 PM _unreal_: between the motor controller box and the machine
07:30 PM _unreal_: for low priority I/O limits, probes, ESTOP etc...
07:30 PM _unreal_: relay controlled devices
07:31 PM _unreal_: once I get that cable done I can at least connect the motor controller box and the machine
07:31 PM _unreal_: and start setting stuff up
07:32 PM _unreal_: on the software and firmware side
07:33 PM pcw_home: have you tested the drives?
07:36 PM _unreal_: ?
07:36 PM _unreal_: the motors or the controllers?
07:37 PM _unreal_: the motor controllers have to be SETUP first. I'm waiting to talk to ve7it so I can get a guided overview on how to log into the controllers
07:38 PM _unreal_: with the serial interface and update there settings to the new machines specs
07:38 PM _unreal_: after I do that then I need to start getting the mesa settings correct
07:39 PM _unreal_: THEN :) linuxcnc
07:39 PM _unreal_: heh
07:40 PM _unreal_: it will be nice to see the machine move finally
07:45 PM roycroft: i'm just starting to build a new stand for my drum sander, and that's going to take at least a week to complete
07:45 PM roycroft: so i've decided to contact the guy who does the sanitary welding on my brewing gear on monday to see if he can repair that part, and how much he would charge
07:45 PM roycroft: i think it's prudent to get a price on that repair before i attempt to do anything myself
07:46 PM roycroft: if he can grind a vee groove on the outside and not get all the way into the innner threads, and then neatly tig weld that up, i can easily turn the weld down smooth
07:47 PM roycroft: the bearing stick up well above the break point, so i don't need to worry about the outside thread at all
07:51 PM _unreal_: nothing like DIY beer :)
07:53 PM andypugh: So, there is enough internal thread to work. All that is really needed is a way to hold the bearing in place?
07:53 PM andypugh: Just glue the bearing to the gear.
07:55 PM jymmmm: I need to build a scissor jack to lift about 300lbs, does anyone have any info on lengths. pivot point, stress points, etc?
07:56 PM jdh: ToT had a video on building one
07:56 PM jdh: not that heavy, but...
07:56 PM jymmmm: Tot?
07:56 PM andypugh: 300lbs is about the maximum you can imagine moving. So just look at it and decide if you could bend it by hand.
07:56 PM jdh: This Old Tony
07:57 PM Eric__: lift 300 pounds how far?
07:57 PM jymmmm: andypugh: I dont have a clue on measuremenst
07:57 PM jymmmm: Eric__: 19 inches
07:58 PM andypugh: Yes, but I imagene you would look at a 1” box section and think “I can bend that” then look at a 2” and think “probably not”
07:58 PM Eric__: so you need to move it repeatedly?
07:58 PM jymmmm: Eric__: Hmmm?
07:59 PM Eric__: if you just have to move it once, it's a different problem
07:59 PM jymmmm: andypugh: so use 1" swuare tubing instead of 1/4" bars?
07:59 PM andypugh: Well, I think 1” would be too small unless very thick-walled.
07:59 PM jymmmm: Eric__: Just has to lift up 19" to slide to another table.
08:00 PM jymmmm: Eric__: stationary in the XY, if that makes sense in what you are asking
08:00 PM jymmmm: andypugh: define "thick" ?
08:00 PM Eric__: I mean does this lifting have to be done often enough to justify building something
08:01 PM jymmmm: yes
08:01 PM andypugh: Why not just get an old car scissor jack?
08:01 PM jymmmm: andypugh: It can't be no more than 2-3" in height when on the ground.
08:02 PM Eric__: that's not easy to do
08:02 PM roycroft: andypugh: i'm still trying to become familiar with regional dialects, and i've another video that i have a guess at
08:02 PM roycroft: i think the fellow is from the manchester area
08:03 PM roycroft: he calls you out by name in it, so maybe you want to check it out for that, if for no other reason
08:03 PM roycroft: https://www.youtube.com/watch?v=gCtRWwvGHeY
08:03 PM roycroft: if you check it out, let me know if you think manchester is a reasonable guess
08:03 PM jymmmm: Eric__: I figured, I'm open to other ideas for a lift other than "scissor", it's jsut what came to mind first.
08:05 PM _unreal_: hehe
08:06 PM _unreal_: he'd love my bandsaw'S
08:06 PM _unreal_: I have a BIG 14" all cast bandsaw
08:06 PM _unreal_: and I have a small tri wheel delta bandsaw
08:07 PM andypugh: roycroft: Wouldn’t like to say, Its hard to place, it’s north-ish.
08:08 PM andypugh: I wonder if he is sat there thinking “OK, finisged the workshop, now what was it I was going to make?”
08:08 PM roycroft: i don't know why i have such an interest, as it seems really difficult to nail down the dialects
08:09 PM roycroft: it's almost as if each person has their own dialect
08:09 PM andypugh: I think he’s moved about.
08:09 PM roycroft: and that may be why it's so hard
08:09 PM _unreal_: heh
08:09 PM _unreal_: damn
08:09 PM _unreal_: I have SOOO many tools
08:09 PM _unreal_: you know I have two DUST collectors
08:09 PM andypugh: I don’t talk the same now as I used to, as I have spent too long trying to make myself understood to southerners.
08:10 PM _unreal_: I have a small portable and a large delta
08:10 PM _unreal_: andypugh, try having a VERY strong maine accent
08:11 PM roycroft: one of the cable tv channels here has made some shows about loggers
08:11 PM roycroft: so-called "reality" shows
08:11 PM _unreal_: if I was to say bucket it would sound like baa..kit said very fast
08:11 PM roycroft: one of the series was about loggers back east
08:11 PM roycroft: and when they did the episodes with crews from maine and form north carolina they had to add english subtitles
08:11 PM _unreal_: I'm on a reality TV show
08:11 PM _unreal_: :)
08:12 PM _unreal_: they where filming us last year. I do super yachts
08:12 PM roycroft: the ones from maine i had no trouble understanding
08:12 PM _unreal_: they are still editing the video. they are supposed to be doing MORE filming NOW but fake virus so oh well
08:12 PM roycroft: and we're talking backwoods maine - those folks delivered most of their logs to mills in quebec
08:12 PM _unreal_: yesaaaaa
08:12 PM roycroft: the ones in north carolina, i had trouble understanding some of them
08:13 PM roycroft: i'd have been ok without the subtitles, but i can see how a lot of people would benefit from them
08:14 PM roycroft: the thing is
08:14 PM roycroft: there are people who mumble everywhere
08:15 PM roycroft: and if they're mumbling in your local dialect yo ucan probably understand them
08:15 PM roycroft: but if they're mumbling in some other dialect it might be hard to understand
08:16 PM _unreal_: heh
08:16 PM _unreal_: I get people just blinking at me all the time
08:16 PM _unreal_: WHAT? is a phrase I'm use to lol
08:17 PM andypugh: Well, listening to https://www.youtube.com/watch?v=FZDpx1aLovc I find his diction very clear, but would have trouble placing it.
08:20 PM jdh: "not from around here", but not very distinctive either
08:30 PM jymmmm: Eric__: Ok, I had watched TOT build before, just watched it again. What do you think the eight capacity of his is?
08:31 PM jymmmm: https://www.youtube.com/watch?v=6GHyuiTF1G4
08:31 PM jymmmm: build a scissor lift ^^^^^^^^^^^^^
08:35 PM jymmmm: His has 4 bars per side, what does that offer compared to two bars per side? A shallower width?
08:35 PM andypugh: roycroft: It’t not me he mentions, there are two of us on that YouTube.
08:39 PM jymmmm: 13" lift and 1100lbs rated... https://www.amazon.com/ZENY-Motorcycle-Center-Scissor-Scooter/dp/B01M33H1RE/
09:09 PM Eric__: the 4 bars/side is for more height, unless I'm misunderstanding
09:10 PM Eric__: eyeball engineering says that design will hold 300 pounds.
09:11 PM jymmmm: Eric__: The amazon link says 1100lbs and is not SS
09:13 PM Eric__: ss doesn't get you anywhere on load capacity
09:13 PM Eric__: I meant the ToT design
09:13 PM Eric__: is your load as floppy as a motorcycle, or is it fairly compact?
09:18 PM jymmmm: floppy
09:18 PM jymmmm: well, not that floppy
09:19 PM jymmmm: and I can do a wider base, like 20 to 24" wide
09:22 PM Eric__: I would make it as wide and long as makes sense, if load capacity is an issue.
09:24 PM jymmmm: yeah
09:24 PM jymmmm: I'm looking at examples of other lift for ideas.
09:49 PM jymmmm: IF I wanted a 24" lift, what determines the "linear" stroke needed, and is there a way I can "shorten" that stroke if needed?
09:52 PM jymmmm: for a scissor lift that is
09:52 PM jymmmm: First look.... https://www.banggood.com/4000N-900LBS-12V-DC-Linear-Actuator-Adjustable-Actuator-Tor-Opener-Linear-Actuator-Motor-2500rpm-p-1142253.html
09:54 PM jymmmm: and how can they claim 900lbs using those mounting ends, they don't look like that could hold 20lbs of force
10:19 PM Rab: More convincing for compression than tension.
10:21 PM jymmmm: Rab: tension being pushing apart?
10:23 PM enleth: is there a way to invoke shell commands from HAL? I'm planning to use an UPS for the LinuxCNC PC and the most convenient place to input the "we're on battery power, hibernate in 2 minutes" signal from the UPS is a digital input on the Mesa card
10:25 PM jymmmm: enleth: what brand UPS?
10:25 PM enleth: a no-name that doesn't have RS232
10:25 PM jymmmm: enleth: what signal are you pulling for the UPS?
10:26 PM enleth: come to think of it, I can just query the input state using halcmd in a 30 second loop outside linuxcnc
10:26 PM jymmmm: from*
10:26 PM jymmmm: enleth: what signal are you pulling from the UPS?
10:27 PM enleth: jymmmm: relay output, DIYed into the UPS
10:27 PM jymmmm: ah
10:27 PM enleth: closed when the "battery operation" LED on the front panel is on
10:28 PM enleth: OK, I will just query the state from outside of linuxcnc, it'll work just fine
10:29 PM enleth: if you're wondering what's the point of that - I prefer the UPS right next to the PC as opposed to circumventing the machine's main isolator switch or powering the PC from a completely separate source
10:33 PM enleth: also, the whole room is on a contactor actuated by an e-stop button by the door, which people habitually slam closed when they *think* everything's off
10:33 PM jymmmm: lol
10:34 PM enleth: as a safety feature, it's a good thing, but I don't want to lose homing on the mill just because I left to take a piss
10:34 PM jymmmm: glue a nails to the big red button, ppl will think twice about pushing it
10:35 PM jymmmm: or put a flip down cover over the button
10:35 PM enleth: I installed it myself, it's supposed to be used when no one's using the shop
10:37 PM enleth: in any case, having the PC gracefully shut down on power loss of *any* kind is a good thing
10:37 PM enleth: and if it retains homing too, it's even better
10:38 PM jymmmm: enleth: where you at on the planet?
10:41 PM enleth: jymmmm: Central Europe, it's 5:30 here
10:43 PM jymmmm: Ah, yeah too far to ship the ups I have to you =)
10:46 PM enleth: someone left this one by the dumpster
10:46 PM enleth: only needed a new battery
10:49 PM enleth: we had a battery, someone brought in a UPS with a dead inverter but a good battery some time ago
10:50 PM enleth: so, it was literally free
10:54 PM jymmmm: cool
11:17 PM enleth: on an unrelated note: how usable LinuxCNC 2.8 actually is at this point?
11:17 PM enleth: assuming the user is absolutely not afraid of debugging something from time to time and in fact runs a machine that requires 5 hours of fiddling for every hour of runtime
11:18 PM enleth: (roughly estimating based on the time spent fixing and upgrading it)
11:20 PM Tom_L: i think several are using 2.8 currently
11:33 PM _unreal_: I'm working twards using it
11:38 PM _unreal_: aliexpress is pissing me off. I'm still waiting on parts