#linuxcnc Logs
Aug 24 2020
#linuxcnc Calendar
01:02 AM rmu|w: XXCoder: https://xkcd.com/838/
01:08 AM XXCoder: lol
01:12 AM Deejay: moin
02:34 AM Loetmichel: mornin'
03:46 AM Loetmichel: *cough* just ordered new carbide mill bits for 303 eur... that new worker kills them by the dozen, as if they were free :-(
03:47 AM XXCoder: :(
03:47 AM XXCoder: if I broke a couple I would stop and talk
03:47 AM XXCoder: might be case worker dont know how expensive it is?
04:16 AM Loetmichel: i told him a couple times
04:20 AM XXCoder: would that worker not last long?
04:40 AM Loetmichel: its "just a student temp"... they are hire and fire even here in germany
04:40 AM Loetmichel: so no, i doubt he will last long
04:41 AM XXCoder: sad as working hard and doing good job increases job prosects
04:41 AM XXCoder: always.
04:42 AM Loetmichel: i noticed that (as a general rule) those student workers are more interested in getting money thann doing good work
04:42 AM Loetmichel: often they are not really "there"... may be to much learning to do but i honestly doubt it.
04:43 AM XXCoder: sure but dont they realize doing good job with same money means ponentally more money later?
04:43 AM XXCoder: though young tend to not have delayed grafaction.
04:43 AM XXCoder: (mispelled word)
04:43 AM XXCoder: ie appercate that good things come later
04:44 AM Loetmichel: XXCoder: i doubt they consider the temp jobs as "permanent enough" to warrant the effort to leave a good impression
04:44 AM Loetmichel: education may be free in germany but that dosent mean you dont have to pay for housing and food.
04:50 AM XXCoder: i wish it was free here
04:50 AM XXCoder: im pretty close to paying off college debts
04:52 AM XXCoder: my heavy duty overpaying means its within 2 years and not within 15 years
04:52 AM Loetmichel: same happens here. but the debt is usulally with the state, its called "BAFÖG" and is an interest-free loan from the state for living expenses while studying
04:53 AM Loetmichel: only those with no rich parents are eliglble to get it though
04:53 AM XXCoder: in my case theres 3 levels, free money from state, interest-free while in college loans, and interest loan type
04:53 AM XXCoder: I never got any of third
04:53 AM Loetmichel: and they have to finish the b.sc or m.sc in an average time
04:53 AM XXCoder: man money was *tight* but I never got any of thjird type yay
04:56 AM Loetmichel: point was that these college "temp" jobs are usually not counted as "real" jobs, neither by the student nor by the univesity
04:58 AM XXCoder: what is ratio between full time pay vs rent of average place to live at?
04:58 AM Loetmichel: depends
04:59 AM XXCoder: very roughly?
05:00 AM XXCoder: its okay is its like 200 eur error
05:00 AM Loetmichel: you can have a "studentenbude" (student flat) thats basically a single room with a bed and a desk and some closet with a fridge and a hotplate (and occasionally a bathroom, or common bathroom in the hall) for as little as 200 eur a month
05:00 AM XXCoder: damn thats extremely cheap
05:00 AM XXCoder: I cant rent a closet for that
05:00 AM Loetmichel: considering that even "minijobs" are paid about 400 eur a month its not that much
05:01 AM Loetmichel: but those housing conditions are limited. if the university runs out then you have to go to the free market
05:01 AM Loetmichel: depending on which city the university is in that can get expensive
05:02 AM Loetmichel: usually the students then pack together and rent a normal flat with a few people
05:02 AM Loetmichel: flats with 3 bedrooms are about 1000 eur here where i live for example
05:04 AM XXCoder: 3 bedrooms can have 6 if youre willing to put up with others
05:04 AM XXCoder: so essentally same price
05:08 AM Loetmichel: yeah, depends vastly on where you study though
05:08 AM Loetmichel: some citys are more expensive, some are cheaper
05:08 AM Loetmichel: as is "market" usually
05:08 AM XXCoder: hmm yeah around par
05:15 AM Loetmichel: btw: "minijobs" up to 480eur (IIRC) are a special thing in germany, they are not tax free but have a "flat rate" tax thats paid entirely by the employer and includes any mandatory social insurance.
05:15 AM XXCoder: i bet you some company use it to sniff out talent
05:15 AM Loetmichel: so up to that salary your "before tax" is the same as "after tax"
05:16 AM XXCoder: not bad. I guess way below normal salary but hey its great for connections, and money while at college
05:16 AM JT-Cave: morning
05:17 AM XXCoder: hey
05:17 AM Loetmichel: yes, and as we have a minimum wage its usually low hours
05:17 AM Loetmichel: so fits a student just fine
05:18 AM XXCoder: indeed
06:03 AM Loetmichel: https://www.isnichwahr.de/r324682-wenn-papa-ein-barkeeper-ist.html <- MUHAHA, thats "best father of the year award" worthy :-),
06:06 AM XXCoder: lol thats funny
06:15 AM Tom_L: morning
06:16 AM XXCoder: yo
07:21 AM skec: Hi guys, may I ask you question about homing. Suppose I have home and limit switch on X axis. The switch is NO, I set in configuration so, that linuxcnc sees it when its pressed. In linuxcnc, in manual axis control when I press "-" the table moves towards the switch, and when it trips it I get Joint 0 on limit switch error. My question is: how can
07:21 AM skec: I make X axis to home automatically (when I start linuxcnc, I would like it automatically find the switch). Hope you get what I mean..
07:22 AM XXCoder: you should set machine max to just under switch, switch should be at 0
07:22 AM XXCoder: erm minium
07:23 AM XXCoder: erm my error
07:23 AM XXCoder: not sure how to figure it that way, mine was manual homing
07:24 AM skec: in other words, I should edit my ini file?
07:25 AM XXCoder: or hal sorry cant remember enough
07:26 AM skec: now in ini file I have: MIN_LIMIT, MAX_LIMIT, HOME_OFFSET
07:26 AM skec: and HOME
07:26 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/configs/NEW_MILL_SHOP_2.7/new_mill.ini
07:28 AM skec: is MAX LIMIT in milimeters, revolutions, or?
07:33 AM skec: Tom_L, in your case, shall homing happen automatically? Or you still have to press something in linuxcnc?
07:38 AM skec: I guess MIN_LIMIT and MAX_LIMIT are set with manually moving axis to both directions, and visually inspecting where to stop? (before hitting minimum limit switch). ?
07:44 AM JT-Cave: that works
07:44 AM JT-Cave: but only after you home...
07:45 AM skec: JT, I have seen on youtube how people press something and machine automatically finds home
07:45 AM skec: I dont know how to explain this ... :(
07:46 AM JT-Cave: just depends on which GUI you use what button you press to start a homing process
07:47 AM skec: can GUI be seen in ini file?
07:48 AM JT-Cave: in the DISPLAY section
07:48 AM skec: also, I see now that I have two HOME...me at TRAJ and another one at AXIS_0..
07:48 AM skec: DISPLAY = axis
07:49 AM skec: and there is button Home All in the linuxcnc panel..which simply sets home to the current position where the stepper is... it does not look for limit switch
07:50 AM JT-Cave: when you run axis what version does it show in the top bar?
07:50 AM skec: 2.7.14
07:50 AM skec: axis.ngc AXIS 2.7.14
07:51 AM JT-Cave: do you have HOME_SEQUENCE set in the ini?
07:51 AM skec: I only have 1 axis, which is X. and yes, I have HOME_SEQUENCE = 1
07:52 AM JT-Cave: there should be a Home All button maybe... dunno with one axis
07:52 AM skec: I just noticed, that when I press Home All button, nothing happens
07:53 AM JT-Cave: what is your HOME_SEARCH_VEL
07:53 AM skec: 1.5
07:54 AM JT-Cave: oh HOME_SEQUENCE = <n> - Used to define the "Home All" sequence. <n> starts at 0 and no numbers may be skipped.
07:54 AM JT-Cave: http://linuxcnc.org/docs/2.7/html/config/ini-config.html
07:54 AM skec: oh, then it should be 0 in my case..
07:54 AM JT-Cave: yup
07:58 AM skec22: oh, now Home All is doing something, however, it looks for home in another direction...
07:58 AM XXCoder: need to invert homing direction
07:59 AM skec22: JT-Cave thank you!
07:59 AM skec22: homing direction as LATCH VEL?
07:59 AM skec22: or home search vel?
08:00 AM skec22: now both is 1.5..shall I put -1.5?
08:01 AM XXCoder: ermm not sure if thats correct way to do it. JT-Cave ?
08:01 AM JT-Cave: yes
08:01 AM XXCoder: cool
08:02 AM skec22: awesome! it worked, but it stopped on the limit switch being pressed
08:02 AM skec22: I guess home offset should be the next to change
08:03 AM JT-Cave: yup
08:03 AM XXCoder: yeah remember my earlier comment about setting zero and minium value
08:03 AM skec22: little by little things start to get clearerer :)
08:03 AM XXCoder: nothing like doing for learning
08:06 AM skec22: can offset be negative?
08:06 AM JT-Cave: yup
08:07 AM skec22: because I noticed that with positive offset I get my table more and more pressed into the switch
08:07 AM skec22: is it normal to have it negative? Or I mixed things up..
08:07 AM XXCoder: your machine "smashes" into switch?
08:08 AM JT-Cave: it's normal to change the sign to make the axis home in the correct direction
08:09 AM skec22: I change offset little by little, so it did not smashed, but slightly pressed in..
08:09 AM JT-Cave: homing needs to end up not touching the switch
08:09 AM XXCoder: interesting. most times switch is triggered by passing feature so machine cant break the switch
08:10 AM XXCoder: hard to explain a sec heh
08:10 AM robotustra: can be homing switch in the middle of the range of axis?
08:11 AM XXCoder: robot can be anywhere but you might want ends too so it dont move in direction and smash into end
08:12 AM XXCoder: skec22: https://lh3.googleusercontent.com/proxy/CjGu0jl2tH_aBqOeAxoOJbnRKboDi53vCESd7JLeCkY72jYvtTKNm2VBYBQRDZrfiM0705ZhdZg8BUBH89FhgrV1948m4fLvZ7KxIl4b1oKlCBqY7RhgfQ
08:12 AM XXCoder: this is pass by side type setup
08:12 AM skec22: hmmm.. even if I set offset to negative, after trigering the switch, the table moves a bit more into the switch after homing
08:12 AM XXCoder: notice how its impossoble to destroy switch
08:13 AM XXCoder: look at numbers as its homing. does it make sense?
08:14 AM skec22: thanks guys, will try around. must leave for the moment
08:14 AM XXCoder: later :)
08:26 AM Spida: Loetmichel: https://twitter.com/mayerpopp/status/1297839817460416512
08:27 AM Spida: somebody (in germany) interested in a milling-job? see above twitter post
08:27 AM XXCoder: is that famed $1,000 montior holder?
08:27 AM Spida: probably *shrug*
08:28 AM XXCoder: translation is refusing to work oh well
08:37 AM Loetmichel: it say: "anybody knows some metalworker that can make those cheaply in small batches?"
08:39 AM robotustra: german are lowballers?
08:39 AM robotustra: cannot afford authentic apple monitor holder?
08:42 AM robotustra: this leg need a bug block of Al to start with, I don't think it will be cheap
08:42 AM robotustra: big*
08:44 AM XXCoder: Loetmichel: thanks
08:45 AM XXCoder: cheaper? sheet cnc and bend
08:45 AM XXCoder: done
08:45 AM robotustra: or the other way is to bend a flat Al and machine it after
08:45 AM XXCoder: yeah double machine would make it very clean. lots hours though
08:45 AM XXCoder: say make it bit oversize and thicker, smaller hole
08:46 AM XXCoder: bend it then machine entire surface
08:46 AM XXCoder: maybe some baking in middle to lose some internal stresses
08:47 AM robotustra: I think that Al which bends without cracks will not hold the angle
08:49 AM robotustra: another way is take a big block of Al and cut it on band saw to make a batch
08:50 AM robotustra: nected L brackets
08:50 AM XXCoder: that leaves you with pretty good amount of material left for other stuff yeah
08:50 AM robotustra: nested
08:52 AM robotustra: the cheapest way is to anneal heat treated sheet Al, bend, machine, sandblast
08:52 AM robotustra: and wait until it hardened back in 2 weeks-1 month
08:53 AM XXCoder: huh
08:53 AM XXCoder: alum hardens on its own?
08:54 AM robotustra: yes, if you have duraluminium on heating the precipitates dissolve and it allows Al to be plastic, after in 1-2 weeks precepitates start to form back and harden Al back
08:54 AM XXCoder: interesting
08:55 AM robotustra: Al + 5% of copper alloy called dur aluminum
08:56 AM XXCoder: would it evenually be green? doubt it as alum oxide is very strong protection
08:56 AM robotustra: which is used in aircraft building
08:56 AM XXCoder: and 5% bit low to show really I would thinkl
08:56 AM robotustra: 5% is dissolving ver good
08:58 AM robotustra: https://www.britannica.com/technology/duralumin
08:59 AM robotustra: it's not written about annealing
08:59 AM XXCoder: "Because aluminum loses corrosion resistance when alloyed, a special laminated sheet form called alclad is used for aircraft construction; it has thin surface layers of pure aluminum covering the strong duralumin core."
08:59 AM robotustra: yep
08:59 AM robotustra: but it's strong
08:59 AM XXCoder: defnitely interesting
09:00 AM robotustra: acrually you can take duralumin, heat it, bend it and it' will harden back in 2 weeks
09:02 AM robotustra: I think since that times there were another ways to improve corrosion resistance of duralumin
09:03 AM XXCoder: i wonder about future alloys
09:04 AM XXCoder: would be funny if someone found an alloy thats essentally as soft as foam, but impossible to break
09:04 AM XXCoder: and can be melted down as normal metal
09:05 AM robotustra: what for?
09:05 AM XXCoder: ultra long life foam
09:05 AM XXCoder: ie if youre making a spaceship to go to star and need to work 100 years or more
09:06 AM robotustra: stainless steel
09:06 AM XXCoder: even though you will probably sit on it twice in all those years, you still want confort right?
09:06 AM XXCoder: thats not confortable.
09:07 AM robotustra: you don't need to fly 100 years
09:08 AM robotustra: in the space
09:08 AM XXCoder: 100 years actually is short for starship
09:08 AM XXCoder: without any ftl anyway
09:08 AM robotustra: people will not fly anywhere unless they learn how to fly in a minutes using graviration engine
09:13 AM XXCoder: Loetmichel: lol someone talked about measuring, apparently one of his coworkers got fired because he was using foot to measure wood beams. literal his foeet
09:13 AM XXCoder: it happened to be size 12 but its still wrong way
09:14 AM Loetmichel: hehe, i am using my arm, finger to collarbone for a meter
09:14 AM Loetmichel: and its pretty precise when i cut off lengths of cable ;)
09:14 AM XXCoder: its fine for rough estimation but it was cut request
09:14 AM Loetmichel: see above ;)
09:14 AM XXCoder: should be less than certain tol, like less than 1/4 inch
09:14 AM XXCoder: ya
09:15 AM Loetmichel: yeah, his actual foot may not bve precise aenough, considering different shoes and rubber and all that
09:15 AM XXCoder: i think it was barefoot but you coyld be right
09:16 AM XXCoder: nom boots yeah
09:16 AM XXCoder: *I mean, no, it was with boot yeah
09:23 AM Loetmichel: hehe, $me just found some old but original shrinkwrapped 18650 when cleaning out an ex-workers desk... "Mtec 8800mAh" Yea, SUUUURE... just put it to my computer charger/discharger and let them do a few cycles... i am surprised if its more than 2000mAh ;)
09:43 AM Loetmichel: *MUHAHA* first round of charge/discharge: 250mAh in, 220mAh out... yeah, 8800mAh my ass ;)
09:45 AM XXCoder: been sitting too long?
09:45 AM Loetmichel: nope
09:45 AM Loetmichel: was still half full when i started the charger
09:46 AM XXCoder: lol wnder if its half sized in case with sand filling other half
09:46 AM XXCoder: saw picture of that
09:47 AM Loetmichel: or paper
09:47 AM Loetmichel: http://www.cyrom.org/palbum/main.php?g2_itemId=14751&g2_imageViewsIndex=1
09:47 AM Loetmichel: that was the last cell i opened
09:47 AM Loetmichel: more than 50% of the cell is simply seperator
09:47 AM XXCoder: lol
09:47 AM Loetmichel: active is only the middle part with the copper on it ;)
09:49 AM Loetmichel: they didnt even bother to weld the wraps to the cup. one of the 4 cells i had was rattling and had no resistance... -> pack not connected on the negative side
09:50 AM XXCoder: definitely deep in shit tier
10:01 AM zipper is now known as Guest77942
10:42 AM cpresser: Loetmichel: did you check its mass vs. a 'real' cell?
10:58 AM Loetmichel: *MUHAHA* second round of charge/discharge: 145mAh in, 205mAh out... yeah, 8800mAh my ass indeed ;)
10:58 AM Loetmichel: cpresser: not yet, tomorrow i will get the letter scale
10:58 AM Loetmichel: i have a few 2900mAh Sanyo cells at the company
12:02 PM Tom_L: robotustra, you should machine those monitor holders from a solid block for $10 ea
12:05 PM Tom_L: XXCoder, , just the introduction: https://www.sciencedirect.com/science/article/pii/S1631070518300914
12:06 PM Tom_L: unless you feel like reading it all :)
12:25 PM robotustra: pretty much what you need to know about age hardening Al alloys: https://ars.els-cdn.com/content/image/1-s2.0-S1631070518300914-gr003.jpg
12:25 PM robotustra: precipitations forms in 200 hours harden the material 2 times
12:28 PM robotustra: and this process is reversable
12:29 PM Tom_L: of course
01:20 PM robotustra: Tom_L, how much does the block of Al costs of the size 5"x6"x8"?
01:41 PM Tom_L: robotustra, what's it weigh?
01:41 PM Tom_L: surplus ~ $.75 lb iirc
01:51 PM Tom_L: haven't gotten any in a while
02:40 PM satiowadahc_work: Curious what developers environments look like for linuxcnc? I tend to use a lot of jetbrains IDE's but it seems that linuxcnc doesn't confirm nicely in it
02:45 PM veegee: Hey all, urgent: https://www.kijiji.ca/v-view-details.html?adId=1511015796
02:46 PM veegee: The guy offered to give these to me for free
02:46 PM veegee: Can anyone guess the weight of those? Machinery mover estimated 10,000 lbs each
02:46 PM veegee: Because I need to plan how to unload tomorrow, it was a last minute offer
02:46 PM veegee: Need to find a forklift that can lift 10,000 lbs
02:47 PM veegee: Nameplate doesn't seem to show their weight for some reason, but if anyone can guess how much they weigh, I'd really appreciate. I'm panicking now trying to figure out how to unload them
03:11 PM Deejay: gn8
03:46 PM XXCoder: Tom_L: thanks
03:47 PM XXCoder: robotustra: thanks
03:54 PM rs[m]1: veegee: if it makes you feel better, you should be ok with 10000lbs
03:54 PM rs[m]1: veegee: then again, quasi-anonymous advice on the internet is cheap ;) - ymmv
03:55 PM veegee: I'm renting a 15,000 lb one to be safe
03:56 PM satiowadahc_work: I onced moved a 10000 lb safe... with a 8000 lb fork lift and 2 truck drivers for counter weights. I suggest not doing that
03:56 PM rs[m]1: can't hurt, capacity on a forklift is with the load close to the mast
03:57 PM rs[m]1: i once ordered a crane to load/unload a press that was estimated to have 10t, 13t at most
03:57 PM rs[m]1: turned out it was nearly 20t
03:58 PM rs[m]1: that was close
03:59 PM unterhaus: is it wrong to waste time painting my lathe?
03:59 PM unterhaus: so embarrassing
04:00 PM robotustra: I used to work as a press brake operator for 8 month
04:00 PM robotustra: when I just came to canada
04:01 PM robotustra: it was fun
04:03 PM XXCoder: unterhaus: depends if its properly done to handle abuse lol
04:04 PM XXCoder: once saw car painted with house paint
04:04 PM robotustra: unterhaus, I was thinking about too whether I have to paint home build machines or not
04:05 PM robotustra: steel can rust, especially in a garage. I have some pieces of iron, started to rust even in appartment!
04:05 PM unterhaus: the things I have painted in the past last okay. And half of the ugly green paint on it now is falling off
04:05 PM robotustra: So, I think painting can help
04:06 PM robotustra: may be you put the paint without ground?
04:06 PM XXCoder: you mean without primer?
04:06 PM robotustra: yeah, primer
04:06 PM robotustra: and degrease it good
04:06 PM unterhaus: It was a school lathe, they would paint it occasionally
04:07 PM unterhaus: I'm more talking about wasting the time to do it, I am reasonably good at painting
04:07 PM robotustra: so you have to remove old paint till the very metal then
04:07 PM unterhaus: not going to do that, the underlying factory paint and filler is solid
04:08 PM robotustra: then just brush it with metal brush
04:08 PM robotustra: to create adhesion
04:24 PM CaptHindsight: Amazon delivered a package that is not ours again and they said "keep it"
04:24 PM CaptHindsight: no big screens yet :(
04:27 PM Tom_L: anything interesting?
04:28 PM Tom_L: had UPS deliver me a pool that wasn't mine
04:28 PM Tom_L: back when pools were 4x their normal price
04:34 PM CaptHindsight: so far just some signs and a storage cabinet
04:34 PM CaptHindsight: Tom_L: in ground? :p
04:35 PM CaptHindsight: delivered a hole
04:48 PM unterhaus: and 5000 bags of concrete
04:48 PM robotustra: :)
04:49 PM unterhaus: some water
04:49 PM unterhaus: I guess I'm going to test Andy Pugh's new iso
04:50 PM XXCoder: lol this is funny https://media.discordapp.net/attachments/735710706963579020/747511179198464130/Hs4qKdE.png
05:03 PM CaptHindsight: a good epoxy primmer can go over just about anything not oily
05:04 PM CaptHindsight: unterhaus: if the factory paint is difficult to remove then I'd leave what sticks well
05:05 PM CaptHindsight: unless it has so many layers it's like an archeological expedition
05:09 PM robotustra: i think each owner should leave a layer
05:16 PM unterhaus: Back when, I don't think they painted machine tools so much as smeared stuff on them to cover up the casting flaws
05:16 PM unterhaus: It's 1/8" thick in places
05:17 PM unterhaus: The factory paint, that is
05:17 PM JT-Shop: bondo
05:17 PM unterhaus: I have heard they used flour
05:18 PM JT-Shop: the machine builders I knew used bondo
05:18 PM JT-Shop: they made rotary threaders
05:26 PM CaptHindsight: speaking of bondo, Home depot caries 3 versions of bondo now
05:26 PM CaptHindsight: i just returned with some
05:27 PM _unreal_: bondo for CAR?
05:29 PM veegee: The machinery mover said his forklift is rated for 10,000 lbs
05:29 PM veegee: So worst case scenario, if the forklift rental doesn't happen since it's so last minute, I might be able to add a counterweight to turn my 8,000 lbs forklift into a 12,000 lb
05:30 PM JT-Shop: having knocked the wound seal off my knuckle I understand why it hurt like hell yesterday
05:31 PM Tom_L: unterhaus, when did andy post a new iso?
05:31 PM CaptHindsight: _unreal_: yes, its allowed if under 1/16in thick
05:31 PM Tom_L: use lead
05:32 PM CaptHindsight: lead ended up having some weird health problem
05:32 PM Tom_L: kindof hard if it's a plastic car though
05:32 PM CaptHindsight: we used lead until the early 90's
05:33 PM Tom_L: mark that as another lost skill
05:36 PM Tom_L: plumbers used it all the time too
05:46 PM CaptHindsight: veegee: depends on the center of mass of the load and lift
05:46 PM CaptHindsight: the load rating is usually based on max safe load at some lift height
05:47 PM CaptHindsight: your lift can handle it's own mass as a load just a few inches off the ground
05:48 PM CaptHindsight: oops https://www.youtube.com/watch?v=fxouNcZGrE4
05:48 PM unterhaus: Tom_L today on the email list
05:48 PM unterhaus: Tom_L, you want link?
05:49 PM CaptHindsight: can't see what he did, try to raise it more or jerked it forward
06:01 PM veegee: CaptHindsight yea just need to get it onto the loading platform
06:01 PM veegee: Worst case scenario, I'll use both forklifts with a friend to control the other one
06:01 PM veegee: At least just for the purposes of lowering it onto the ground
06:02 PM veegee: That'll give me some time to figure out how to get it inside
06:02 PM veegee: The only blocker right now is the forklift rental company wants some kind of "insurance"
06:02 PM veegee: I have no idea what that is. They said they need to be added to my insurance but I doubt car insurance will handle that
06:03 PM veegee: So I'm in a very tough spot right now because I have to figure everything out before the truck arrives tomorrow at 11am (in 16 hours)
06:03 PM veegee: I have a 2 rated ton gantry crane that should be able to handle 4 ton due to safety factor. It has a nice strong I beam and all grade 8 bolts
06:07 PM XXCoder: fun video https://youtu.be/LwIDhQqRmHI
06:07 PM XXCoder: lots weird specialist equipment
06:11 PM rs[m]1: veegee: 10000lbs should be possible to lift/move with 2 pallet jacks
06:14 PM veegee: rs[m]1 I have two pallet jacks
06:14 PM veegee: But the problem is lifting them off the truck and into the workshop
06:14 PM veegee: Need a forklift for that
06:14 PM veegee: Also there are 11,000 lb rated pallet jacks I could buy, not that expensive
06:15 PM veegee: The scary part is that I really don't know the real weight of these machines. It doesn't seem to be on the nameplate
06:15 PM veegee: 5,000 lb forklifts are everywhere. but 10,000 lb and 15,000 lb are much rarer
06:16 PM Tom_L: unterhaus, sure
06:18 PM Tom_L: found it
06:18 PM Tom_L: wait... it says not found
06:19 PM Tom_L: it's not the pre3 one is it?
06:40 PM unterhaus: yes, it is
06:40 PM unterhaus: sorry my wife dragged me off to walk the dogs
06:40 PM unterhaus: http://www.linuxcnc.org/iso/linuxcnc-2.8.0-pre3-buster.iso
06:44 PM Tom_L: i found that one but didn't know if that was it
06:44 PM Tom_L: thanks
06:45 PM Tom_L: i see there's one for the rpi4 as well
07:22 PM CaptHindsight: veegee: have a pic of the gantry crane?
07:22 PM CaptHindsight: what holds the gantry?
07:23 PM CaptHindsight: the top i-beam
07:23 PM CaptHindsight: portable, built into a brick wall on one side, a-frame on each end??
09:58 PM veegee: CaptHindsight https://i.pinimg.com/originals/aa/31/34/aa3134519abc2b200ee03ab44c4732cc.jpg
09:59 PM veegee: It's a 2 ton gantry crane
09:59 PM veegee: Class 8.8 bolts throughout. Welds look solid
09:59 PM veegee: It looks almost exactly like that
10:00 PM veegee: I'll have to see if I can get some grade 100 chain tomorrow morning
10:01 PM veegee: worst case scenario, it can hold half the weight and the forklift can hold the other half just to lower the thing to the ground so I'll have some time to decide the next steps without holding up the truck driver
10:03 PM veegee: I love grade 100 chain so much. Every other material makes me nervous. Web sling and wire rope look like they're about to kink and fray/snap around any bends. Really hard to shorten as well
10:04 PM veegee: chain is super versatile and easy to shorten with grab hooks. Easy to protect your load by wrapping the chain with an old bicycle tire too
10:04 PM veegee: also makes for a great weapon to whack people with if you're good at swinging it without hitting yourself
10:07 PM veegee: Web sling would be great if I can figure out how to shorten it properly
10:27 PM CaptHindsight: veegee: should do it unless you whip it around
11:02 PM veegee: CaptHindsight I'm really hoping, thanks
11:23 PM veegee: Damn, I hate it when half my grinding discs (even new ones) have some inherent imbalance
11:24 PM veegee: It makes the whole damn tool vibrate.
11:24 PM veegee: Then the next disc is perfectly balanced. So random. Am I doing something wrong?
11:24 PM XXCoder: cant make jig to rebalnce em?
11:24 PM veegee: Applies to type 27 grinding wheels and type 1 cutoff wheels
11:25 PM veegee: no idea how I'd go about rebalancing a cutoff wheel unless you mean make it perfectly circular like a lathe
11:25 PM XXCoder: how loose is disc anyway? ie can you push it off center
11:25 PM veegee: But I thought it becomes perfectly circular by nature
11:25 PM veegee: No, they all have very good hole size tolerance
11:26 PM veegee: flap discs however, they all seem to be perfectly balanced
11:26 PM veegee: it's just the abrasive grinding ones
11:26 PM XXCoder: did you clean after outting it in?
11:26 PM veegee: Yup, cleaned threads, washers, everything
11:26 PM veegee: Don't get me wrong, they work, but the vibration causes it to bounce off the workpiece and make it less effective at removing material
11:26 PM XXCoder: ie use stone to make it round and cocenteral to bolt hole
11:27 PM unterhaus: I need to have some machining done and I was trying to remember partsbadger. Out of the blue, they started spamming me
11:27 PM unterhaus: probably because of google
11:28 PM veegee: XXCoder you mean stone to flatten the metal part of this in the middle? https://static-content.cromwell.co.uk/images/854_854/g/jeeps/280/bch2802230d.jpg
11:28 PM veegee: Can't imagine that's the issue. I tighten the nut pretty hard
11:28 PM XXCoder: hmm that type dont need such I think
11:28 PM XXCoder: is too hard possible?
11:28 PM XXCoder: deforming by bolts
11:28 PM XXCoder: or bolt
11:28 PM veegee: I have to figure out where the imbalance is coming from. Might need to build a jig for that with an accelerometer
11:28 PM XXCoder: check washer and bolt see if nice and flat
11:29 PM veegee: they are
11:29 PM veegee: because rest of my discs work fine
11:29 PM veegee: all the flap discs, the concrete grinding discs, the metal cutoff discs (that is, they're made of metal)
11:29 PM XXCoder: bad make?
11:29 PM veegee: possibly
11:29 PM veegee: but taipan is generally decent
11:29 PM veegee: walter zipcut is also known to be decent
11:30 PM veegee: and they are highly effective when perfectly balanced. SUPER fast and SUPER aggressive cut
11:30 PM veegee: but any imbalance causes disc to kick back and not cut half the time, making the cut slower
11:40 PM veegee: But damn those carbide tipped cutoff wheels are so great. Don't have to worry about shattering and they don't burn plastic either
11:41 PM XXCoder: yeah though you probably want to find cause of vibration
11:45 PM CaptHindsight: i use those in $15 grinders without issue
11:45 PM CaptHindsight: there is little play between the mounting hole ID and the grinders output shaft OD
11:46 PM CaptHindsight: builds up your forerarms