#linuxcnc Logs

Aug 11 2020

#linuxcnc Calendar

03:10 AM Deejay: moin
03:28 AM Loetmichel: uh... just had a talk with our student temp worker...maan, i mever thought i've meet someone in his late 20s that didnt know how a car engine works... had to explain him how an alternator works and why it is needed in a car... and that guy is on his way to be an m.sc in mechanical engineering?
03:39 AM rmu: Loetmichel: maybe his car still uses carbide lamps
03:46 AM sensille: cars still have alternators?
03:56 AM Loetmichel: rmaw: no, he dont have a drivers license, he rides a bicycle
03:56 AM Loetmichel: rmu
04:51 AM JT-Cave: morning
04:51 AM XXCoder: hey
05:24 AM rmu: Loetmichel: that will be germany's downfall, mechanical engineers without drivers licence. next thing is tempolimit on the autobahn!
06:17 AM Tom_L: morning
06:30 AM JT-Cave: yo
06:30 AM JT-Cave: found your programmer in my electronics boxes this morning
06:30 AM * SpeedEvil wonders when the average car will not need an alternator again.
07:11 AM Tom_L: heh
07:16 AM JT-Cave: I think my level shifter is not fast enough or something for SPI to work from the Rpi 3.3v to the DotStar 5v
07:16 AM JT-Cave: or I may just be full of crap dunno
07:30 AM JavaBean: might want to get some of that out, jt... hate for you to assplode
07:49 AM JT-Cave: hmmm maybe I have 2 channel bi-directional logic level shifter that would also explain why it didn't work
07:49 AM beachbumpete1: Good Morning
07:50 AM JT-Cave: hey pete
07:51 AM beachbumpete1: Hey JT Howzitgoin
07:52 AM JT-Cave: doing ok can't wait for cooler weather
07:52 AM beachbumpete1: Hell yeah man its been hot as hell lately.
07:52 AM JT-Cave: I have a dozen Cinnamon Queen chickens and man did they grow fast
07:53 AM beachbumpete1: Ya gonna make some chicken nuggets? hehe
07:53 AM JT-Cave: https://gnipsel.com/images/chickens/cinnamon-queens/7-14-20-01.jpg
07:53 AM JT-Cave: just eat the eggs lol
07:54 AM beachbumpete1: nice coup
07:54 AM beachbumpete1: or is it coop
07:55 AM JT-Cave: that's the run, the coop is behind the little door
07:55 AM JT-Cave: https://gnipsel.com/images/chickens/12x16-coop/coop-deux-05.jpg
07:58 AM beachbumpete1: https://imgur.com/gallery/YiKe7Xx Just finished this mock up
07:59 AM JT-Cave: wow that's nice
07:59 AM beachbumpete1: Modeled and programmed everything on this inside fusion360. All of the moldings were 3D CNC machined on a flatbed CNC router in our shop.
08:00 AM JT-Cave: big router?
08:00 AM beachbumpete1: the paint job was rushed because the customer was only going to be in the country for a couple days to see it. But other than that it came out pretty nice.
08:00 AM beachbumpete1: yeah its a 5'x12' CR Onsrud
08:01 AM JT-Cave: nice
08:01 AM beachbumpete1: its 16 feet tall and like 10 foot wide
08:02 AM beachbumpete1: There is a door being built for the middle that will be over 11 feet tall.
08:02 AM beachbumpete1: pair of doors
08:02 AM beachbumpete1: It was fun to build it even tho we were under a tight timeline.
08:03 AM beachbumpete1: it had to be machined and assembled/painted inside of two weeks.
08:03 AM JT-Cave: I'm glad I don't have a timeline anymore lol
08:03 AM beachbumpete1: I hear ya.
08:03 AM beachbumpete1: Everything we do here seems like it was supposed to be done yesterday
08:04 AM JT-Cave: I hear that
08:04 AM beachbumpete1: and we deal with almost constant changes to designs
08:06 AM JT-Cave: https://gnipsel.com/images/chickens/cinnamon-queens/8-11-20-01.jpg
08:06 AM JT-Cave: that's a photo today
08:06 AM JT-Cave: shower time here
08:10 AM beachbumpete1: nice chickens
08:36 AM Loetmichel: GNAH! China tools. just tried to loosen a bolt from a DSUB with a cheap 4mm shaft bitset handle and the provided 5mm hex nut bit. it bloomed like a tulip on me. HOW CAN THE BRASS STUD BE HARDER THAN THE "STEEL" Nut bit?
08:55 AM JT-Cave: turns out I full of crap it's a bi-directional level shifter so I had the wrong pins connected on one channel
09:01 AM Centurion-Dan2 is now known as Centurion_Dan
09:45 AM Tom_L: JT-Cave, what you workin on?
10:25 AM roycroft: adam savage made a giant brass nut and bolt a couple weeks ago
10:25 AM roycroft: the video is entertaining
10:25 AM roycroft: https://www.youtube.com/watch?v=98MCz9gQaiE
10:26 AM roycroft: spoiler: many times it did not go well
10:51 AM Eric__: I am trying to level my lathe. Spoiler: sometimes it hasn't been going well
10:51 AM Eric__: letting it rest right now, it's almost level. Figure it will need some tweaking
11:00 AM roycroft: it's an iterative process, not just a procedure
11:04 AM jymmmm: morning
11:04 AM roycroft: hello
11:04 AM jdh: heat it up with a torch, let it anneal in place
11:07 AM jesseg: That's about the quality of leveling I did on mine. It's not tall enough for me so I just set it up on short blocks cut from 4x6 plank. The big end sits on 4 blocks. The small end sits on two blocks, under the center of the ways. Who knows if it's straight or not but at least it's not under torsional strain :P
11:07 AM jesseg: I suppose I should check it some day :P
11:26 AM JT-Cave: Tom_L, sunrise sunset led
11:35 AM Eric__: I thought everything was dialed in earlier. Then I checked the front to back level and it was way out. Checked to see if the floor cracked or something
11:36 AM jdh: big lathe?
11:36 AM Eric__: It's a sheldon R13, so relatively heavy for a 13" lathe
11:37 AM Eric__: I didn't realize the basement floor was quite so out of flat
11:43 AM jdh: heh, we have 'flat' factory floors. whenever we put a new machine in or move one, it is always a challenge to level
11:44 AM Eric__: Can't wait to level the mill after I move it
11:45 AM Eric__: Although I assume that is a lot less compliant than a lathe
11:45 AM Eric__: The lathe has 8 bolts vs. 4 on the mill, so that's a pain too
11:59 AM Eric__: reminder to aim your compressor in the direction of the neighbor you don't like https://kdvr.com/news/denver-couple-displaced-after-air-compressor-flies-into-their-home/
12:29 PM skunkworks: http://electronicsam.com/images/greenmachine/IMG_20200811_122801.jpg
12:29 PM Tom_L: no keyway
12:30 PM Tom_L: :)
12:30 PM skunkworks: other side - but no
12:30 PM skunkworks: it would be nice to have a 11mm reem
12:30 PM Tom_L: i've got one you can borrow
12:30 PM skunkworks: heh - I think it is close enough..
12:31 PM Tom_L: err maybe it's 10
12:31 PM skunkworks: thanks though
12:31 PM Tom_L: it's a reverse flute
12:31 PM skunkworks: yah - I thought the motor shaft was a weird size
12:32 PM skunkworks: I had made a go gauge and it slips in easy. But it is certainly closer to 11mm than the old pully was
12:32 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/thread_mills/Reamers.jpg
12:32 PM Tom_L: yeah the middle one is 10mm
12:32 PM Tom_L: 'gun' reamer i was told
12:33 PM skunkworks: I should look through our stuff - but I don't really think we have any metric ones
12:33 PM Tom_L: local guy has all kinds of surplus tools
12:33 PM skunkworks: We have some adjustable ones.. But I don't trust them. (and don't think I have every used one)
12:33 PM Tom_L: he's selling off a building full tomorrow
12:33 PM skunkworks: auction?
12:33 PM Tom_L: yes
12:34 PM skunkworks: going?
12:34 PM Tom_L: no
12:34 PM Tom_L: i've seen most of it and it's mostly too big for my stuff
12:34 PM Tom_L: lots of fasteners etc too
12:35 PM skunkworks: isn't everything a gun reemer if you are selling? ;)
12:35 PM Tom_L: https://budpalmerauction.com/
12:35 PM Tom_L: he had a whole box full, he gave me a couple
12:56 PM roycroft: an in person auction doesn't seem like a very safe place to go anyway
12:56 PM * roycroft wonders why all auctions are not done online
12:57 PM Tom_L: skunkworks, just use a boring bar
01:21 PM roycroft: wow
01:21 PM roycroft: on sunday i ordered some hand-forged bolts from an outfit who make everything to order and have a 2-3 week lead time
01:21 PM roycroft: their website says that their lead time is extended do to the pandemic
01:21 PM roycroft: but i just got a shipping notification from them
01:21 PM roycroft: i don't need these until next month
01:22 PM roycroft: but i'll take them sooner :)
01:22 PM skunkworks: Tom_L: I don't have one small enough...
01:22 PM skunkworks: yet
01:22 PM roycroft: make one
01:23 PM skunkworks: like I have a machine shop.. oh. I do..
01:23 PM roycroft: you don't even need a machine shop to make a boring bar
01:23 PM roycroft: a hacksaw, a drill, and some files are all that are needed
01:24 PM skunkworks: you make it sound so easy...
01:24 PM skunkworks: ;)
01:24 PM roycroft: i left out the elbow grease part
01:25 PM skunkworks: I have a container of that.. But is seems to be variable size. some days it is bigger than others.
01:26 PM roycroft: it's a funny thing
01:26 PM roycroft: fed more by motivation than anything else
02:10 PM Thorhian: So somebody told me that you shouldn't drive a V-Belt more than 1800 RPM? Is this true?
02:12 PM CaptHindsight: does anyone recall the max jitter with preempt_rt on the Rpi's?
02:13 PM rmu: usually around 50┬Ás iirc
02:15 PM CaptHindsight: oh, so few Khz stepping is not a problem
02:16 PM CaptHindsight: the cheap LCD resin printers use a ~1/4-20 lead screw (not acme)
02:16 PM rmu: that is with 1khz thread, don't know if it gets worse with higher frequency
02:16 PM CaptHindsight: and move pretty slow
02:16 PM CaptHindsight: they don't even need real time stepping, it's one axis
02:17 PM CaptHindsight: and it just has to sync z motion or z stopping to an image on the LCD
02:17 PM CaptHindsight: move Z a few mm, show image, move z up and down a few mm
02:18 PM CaptHindsight: and only have one limit switch
02:19 PM CaptHindsight: so LCNC can easily do this on a rpi or use the Orange Pi and the integrated micro for stepping
02:21 PM CaptHindsight: the only issue is driving the cheap cell phone displays that they use
02:26 PM CaptHindsight: MIPI
02:26 PM CaptHindsight: http://www.orangepi.org/Orange%20Pi%204/ no problem
02:28 PM CaptHindsight: https://www.raspberrypi.org/products/raspberry-pi-4-model-b/specifications/ no problem
02:36 PM Eric__: well, the lathe was off more than I thought it was going to be
02:36 PM Eric__: probably never been leveled before
02:36 PM Eric__: hopefully it doesn't move quite as much this time or I will wonder if something is wrong
02:37 PM roycroft: if you just moved it to where it currently lives it may take a few weeks to totally settle in
02:37 PM CaptHindsight: Thorhian: RPM makes little sense since it's distance/time that is the issue
02:38 PM CaptHindsight: short belt vs long belt
02:38 PM CaptHindsight: they can be at the same velocity but far different RPM's
02:39 PM CaptHindsight: Thorhian: https://www.tyma.eu/technical-information/faq/what-is-the-maximum-circumferential-speed-of-belts/
02:39 PM Eric__: roycroft, I moved it about 2 weeks ago, but I only started leveling it today
02:40 PM roycroft: oh
02:40 PM roycroft: it will still move, but it shouldn't move very much
02:43 PM Thorhian: Thanks CaptHindsight. You got any recomendations of online stores for the USA to get belts and pulleys/sheaves? My motor shaft and spindle shaft are 19mm and 25mm respectively, so they are just barely off from 3/4" and 1", making it really hard to find parts locally or even on amazon from what I've seen (at least the pulleys/sheaves).
02:49 PM CaptHindsight: Thorhian: metric sizes?
02:50 PM Thorhian: Yeah, If I have to, since the bore diameters will likely have to metric.
02:50 PM Eric__: I probably could borrow a level that is 5x better than my starrett. Might make my head explode
02:50 PM jdh: the shearwater cloud desktop kinda sucks
02:51 PM jdh: <wrong chan>
02:51 PM CaptHindsight: Thorhian: what are you trying to achieve? two pulleys and what rpm? what load?
02:52 PM CaptHindsight: what RPM on the motor and are you going up or down to the spindle (ratio between pulleys)
02:53 PM Thorhian: I have a 1.8kW motor, runs at 3000RPM without a load approx. I want my spindle to be able to go at least 4500 RPM, so I would want a 1/1.5 or 1/2 ratio.
02:53 PM CaptHindsight: Eric__: does the better level change when you walk around the machine?
02:53 PM CaptHindsight: more speed less torque
02:54 PM Thorhian: Supposedly it can can crank 16N*m max, but the typical "rating" is 6N*m, so even halving that seems to be plenty.
02:55 PM Thorhian: It's a 220V AC servo :) Got it yesterday in the mail finally. I've been searching for a decent retailer for sheaves though for a while :/
03:05 PM Eric__: 8 bolts is 5 too many
03:06 PM Eric__: I think that's why it moved so far one of the times
03:07 PM Eric__: I think it might have flopped from one set of 3 bolts to the other
03:10 PM CaptHindsight: Thorhian: use the google after you run the numbers on belt velocity
03:11 PM CaptHindsight: compare belt types and available pulleys
03:11 PM CaptHindsight: you might change your mind from v-belt to timing based on price and availability of pulleys
03:12 PM Thorhian: I was told Timing belts were a bad idea for this?
03:12 PM CaptHindsight: why?
03:12 PM CaptHindsight: or just "bad"?
03:13 PM Thorhian: Basically just "bad", based on some people's advice here.
03:13 PM CaptHindsight: https://www.sdp-si.com/D265/HTML/D265T042.html
03:13 PM Thorhian: Timing would be nice in the sense of not needing another encoder, since my motor has one lol, if it can do the job.
03:15 PM Deejay: gn8
03:15 PM CaptHindsight: your spindle speed is within the range of timing belts
03:17 PM CaptHindsight: Thorhian: ask them for "why" not timing belt?
03:17 PM Thorhian: Okay. Besides the available room around it, are there any guidlines on determining the diameter of a pulley?
03:17 PM CaptHindsight: sure
03:18 PM Thorhian: Besides "bad torque transfer" and noise, I haven't heard much about why they are "bad".
03:18 PM CaptHindsight: huh, they work on car engines
03:19 PM CaptHindsight: low speed torque can be an issue
03:25 PM CaptHindsight: https://www.rainbowprecisionproducts.com/goodyear-nrg-belts
03:31 PM SpeedEvil is now known as Guest19010
03:34 PM BitEvil is now known as SpeedEvil
03:34 PM CaptHindsight: Thorhian: https://www.baldor.com/mvc/DownloadCenter/Files/MS4050
03:34 PM Thorhian: Ah lol I actually found that doc.
03:37 PM Eric__: when I got new belts for my lathe, I somehow got them too short and now the front cover doesn't go on
03:37 PM CaptHindsight: https://www.engineersedge.com/vee_flat_belt_menu.shtml
03:38 PM Tom_L: those have longer center distance that i need or i'd consider them
03:38 PM Eric__: can't say I want to buy new belts $70 just so the cover works, but it would be nice.
03:38 PM Tom_L: need something around (haven't measured exact) 4"
03:39 PM Tom_L: 4-5
03:41 PM Thorhian: I forgot about the key on my motor shaft *Facepalm*. It's 19mm plus a key lol. Gonna have to figure out how to accomadate that lol
03:42 PM Tom_L: 3.4 CD
03:45 PM Tom_L: nice pdf though
03:46 PM SpeedEvil: Thorhian: loctite can save you!
03:46 PM SpeedEvil: (mostly kidding)
03:46 PM roycroft: so it's kamala harris
03:48 PM rmu: https://en.wikipedia.org/wiki/Kamala_Harris
03:48 PM Tom_L: and why do i care?
03:49 PM Thorhian: Hey Tom_L, where did you source your pulleys from?
03:49 PM Tom_L: sdp-si
03:50 PM Tom_L: but i'm looking at aliexpress right now
03:50 PM Tom_L: for timing pulleys, they have a calculator
03:50 PM Tom_L: center distance etc
03:52 PM Tom_L: CaptHindsight, do you have any experience with HTD series?
03:52 PM Tom_L: not sure what those are
03:59 PM Tom_L: they look similar to the GT series
03:59 PM Thorhian: From what I read on SDP-SI, GT2/3 is the successor of HTD.
03:59 PM Tom_L: oh
04:00 PM Tom_L: i'm using gt2 on my spindle now but i think i'll need something heavier if i swap motors
04:00 PM Tom_L: 9mm wide
04:00 PM Thorhian: Ah.
04:00 PM Thorhian: I can't find any pulleys that fit a 19mm keyed shaft lol
04:06 PM Tom_L: you might have to bore one out
04:06 PM Tom_L: i did
04:12 PM roycroft: a 5/8" bore is extremely common, and quite easy to bore to 19mm
04:19 PM CaptHindsight: easy with the tools
04:25 PM CaptHindsight: get your mechanical engineering basics here https://www.youtube.com/watch?v=mzWMdZZaHwI&list=PL3D4EECEFAA99D9BE
04:25 PM CaptHindsight: 3 hours on belt drives
04:38 PM Tom_L: meh, i'll wait for the summary
04:42 PM Thorhian: Due to how close 19mm is to 3/4", I think ill just get a 3/4" bored pulley. I have a key anyways, so I don't think I need to worry, especially if I shim it.
04:47 PM CaptHindsight: a pulley that wobbles at 4.5K rpm should not be much of a problem
04:52 PM roycroft: the keyway might not line up well
04:55 PM CaptHindsight: https://en.wikipedia.org/wiki/Machine_shop cheaper and easier than DIY
04:57 PM Thorhian: XD Are you telling me to go to machine shop?
05:16 PM Thorhian: I'm busting out the misumi catalog to check out their timing belt options.
05:39 PM roycroft: i just started gluing up the back half of my bench top
05:40 PM roycroft: i wasn't expecting to have the front half done until tomorrow
05:40 PM roycroft: so things continue to go well ahead of schedule
06:51 PM CaptHindsight: has anyone put a simple touchscreen GUI on a small graphical LCD for LCNC?
06:51 PM CaptHindsight: pic coming up
06:53 PM CaptHindsight: https://youtu.be/UIBA8Eat67k?t=94 tiny like these
06:56 PM CaptHindsight: http://linuxcnc.org/docs/html/gui/mini.html
06:57 PM Eric__: that's nice, I re-checked the lathe and it got more level than it was when I left it :)
07:08 PM roycroft: well that was a frustrating experience
07:09 PM roycroft: i ran into a variant of "i'm an idiot and can't think so i overbuild to compensate"
07:09 PM roycroft: i was at woodcraft picking up a couple tools, and the cashier wanted to get chatty
07:09 PM roycroft: i did not
07:10 PM roycroft: so i truthfully told him i have a glue-up in clamps and i need to get home so i can pop the clamps and laminate some more layers
07:10 PM roycroft: he asked how long i clamp things up
07:10 PM roycroft: and knowing this was coming, like an idiot i said "on a day like today a couple hours is more than enough"
07:11 PM roycroft: which sent him into a rant about how i have to leave things in clamps at least overnight, and preferably for 2-3 days, to be sure it's going to cure properly
07:11 PM roycroft: the manufacturer states 30 minutes to 2 hours max
07:11 PM roycroft: on a warm day like today, 30 minutes is probably quite fine
07:12 PM roycroft: i asked him how many times he had failed glue joints from following the manufacturer's procedure, and he said "none - they always lie about that and i have always left things clamped up way longer than they recommend"
07:13 PM roycroft: i mentioned as i was leaving that i follow the manufacturer's procedure and have never had a failed glue joint for having done so
07:14 PM roycroft: i just don't get how people can "know" something with zero evidence better than engineers who have thoroughly tested their procedures
07:17 PM Tom_L: you walked into that
07:19 PM roycroft: yeah, i should have just shut my mouth and made up a different excuse
07:20 PM roycroft: or i should have said "the glue-up has been in clamps for 3 days and it's finally time to remove them!"
07:20 PM * JavaBean grumbles at his internets, wonders what he missed
07:20 PM roycroft: the guy did not even know what kind of glue i was using
07:20 PM roycroft: i guess "all glue requires at least overnight"
07:21 PM roycroft: there are epoxies that i'd definitely leave overnight
07:21 PM roycroft: and epoxies that can be unclamped in 5 minutes
07:21 PM roycroft: hide glue barely needs to be clamped at all
07:22 PM Tom_L: animal glue sets up in about 3-5 min
07:27 PM Thorhian: Seems Misumi's timing pulley and belt prices are pretty reasonable :)
07:27 PM roycroft: yeah
07:27 PM roycroft: like i said - it barely needs to be clamped at all
07:27 PM roycroft: if you rub the parts together and hold them for a minute they'll be fine
07:28 PM Tom_L: is hide glue the same?
07:28 PM roycroft: yes
07:28 PM Tom_L: melt it in a hot pot
07:28 PM roycroft: the rubbing bit is kind of like kneading bread
07:28 PM roycroft: yes
07:28 PM roycroft: you want to heat it to about 60 degrees
07:28 PM Tom_L: i've used plenty of that...
07:28 PM roycroft: it doesn't smell pleasant when heated
07:29 PM roycroft: but it's an excellent glue
07:29 PM roycroft: very strong
07:29 PM roycroft: zero creep
07:29 PM Tom_L: i used a pot of boiling water and leave the jar in it
07:29 PM roycroft: and it can be easily undone when necessary
07:29 PM roycroft: that works fine
07:29 PM Thorhian: Hey Tom_L, if you want another timing belt you should check out Misumi.
07:29 PM roycroft: if it gets too hot it will lose some of its strength
07:29 PM roycroft: but it will still work for most things
07:30 PM Tom_L: Thorhian, i need to wait until i know what my requirements are
07:30 PM Tom_L: they will change slightly with a different mount
07:30 PM Tom_L: roycroft, keeps forever too
07:31 PM roycroft: yes, hide glue can keep for a long time
07:31 PM Tom_L: i used to let the brush harden in the jar and keep it for next time
07:31 PM roycroft: i do that too
07:31 PM roycroft: i also don't bother cleaning my brush when i use shellac
07:32 PM roycroft: i just let it harden, and when next i need to apply some shellac i set it in the jar of shellac for a half hour or so before starting, and it dissolves back in
07:32 PM JavaBean: is there a "particular" shellac that is used for temporary mounting?
07:38 PM roycroft: temporarly mounting what?
07:40 PM JavaBean: pieces to a lathe/cnc/mill/etc... its something i saw on a clickspring(or another one of those witchcraft 'tubers) video
07:41 PM roycroft: i'm not sure what cut to use, but if you want to adhere stuff like that i'd use a dewaxed shellac
07:41 PM roycroft: probably a fairly stiff cut, like 3#
07:41 PM roycroft: if you can't find dewaxed shellac, mix up some regular shellac and let it sit for a few days
07:42 PM roycroft: the wax will separate out, and you can decant the dewaxed shellac
07:42 PM JavaBean: nah, he used a flame. melted a lil bit in a tin, used a "stick" to get some and dotted the part before sticking it onto something already chucked
07:42 PM roycroft: it seems to me that dewaxed shellac would "stick" better
07:43 PM roycroft: oh, so he did not dissolve it in ethanol like is done for wood finishing
07:43 PM JavaBean: no
07:43 PM roycroft: just straight shellac flakes
07:43 PM roycroft: or whatever form he got it in
07:43 PM roycroft: it probably doesn't matter much, then
07:43 PM roycroft: whatever is cheapest
07:43 PM roycroft: it's all basically the same stuff
07:43 PM roycroft: lac beetle secretions
07:43 PM JavaBean: hehe, i will need to remember that
07:50 PM _unreal_: maken dust making a pocket so I can flip the last part I need for my dust shoe
07:50 PM _unreal_: then I can mill the back side install it and be done making dust
07:50 PM CaptHindsight: monkey see, monkey do
07:51 PM _unreal_: if monkey make a mess monkey dodo
07:51 PM CaptHindsight: yes, poopoo doodoo, fits most "discussions" on IRC as well
07:57 PM Thorhian: XD
08:21 PM Eric__: there are shellac sticks made for repair, maybe he used one of those
08:34 PM roycroft: shellac is pretty simple stuff
08:34 PM roycroft: it's lac beetle secretions, which contain wax
08:34 PM roycroft: it gets dissolved in ethanol
08:34 PM roycroft: the ethanol evaporates completely in minutes at most
08:34 PM roycroft: leaving just the lac beetle secretions
08:35 PM roycroft: if you mix it up in a jar and cover the jar the wax will settle off
08:35 PM roycroft: and you can decant the liquid layer and that is dewaxed shellac
08:35 PM roycroft: if you leave the jar of dewaxed shellac open the alcohol will evaporate and you'll have dewaxed lac beetle secretions
08:35 PM roycroft: and that's all there is to it
08:35 PM roycroft: so you can get it in any form that you want and turn it into whatever form you want
08:36 PM CaptHindsight: get UV cured urethane, brush on urethane, place in sunlight, cured in <1 minute
08:56 PM veegee: Well today was interesting. Felt something I've never felt before
08:56 PM veegee: Got shot right in the groin with a blast of compressed air from 20m of 1/2" extension hose pressurized to 200 PSI
08:56 PM veegee: Through the opening of a G coupler plug
08:57 PM veegee: the pain was so intense I wanted to throw up. Funny reaction, that
08:57 PM CaptHindsight: hey what you do behind closed doors is up to you!
08:58 PM veegee: I'm too used to disconnecting the tool from the quick coupler which is safe, but this time I had to disconnect the hose from the FRL to plug in a different hose that didn't have oil in it
08:59 PM veegee: and the FRL is mounted on the work table which happens to be at around groin height
08:59 PM veegee: So yeah fully pressurized hose vented in a very unfortunate direction
09:05 PM CaptHindsight: was in a discussion with people trying to jail break closed source resin printers that only have a Z-axis stepper motor and a LCD display
09:05 PM CaptHindsight: they think that LinuxCNC is too difficult to work with
09:06 PM CaptHindsight: yet have spent years working on coming up with a control board for swaps
09:06 PM XXCoder: lcnc dont have correct gcode support for resin or fdm
09:06 PM CaptHindsight: they appear to have discovered fire and the wheel so my hopes are still high
09:07 PM CaptHindsight: wutz wrong with the g-code?
09:07 PM XXCoder: there is no temperate set gcode for example
09:07 PM norias: that.. would make sense
09:08 PM CaptHindsight: oh fort fucks sake, use an M code
09:08 PM CaptHindsight: whats the reprap g-code for temp?
09:09 PM CaptHindsight: they just pulled them all out their buts when the wrote GRBL and similar
09:09 PM XXCoder: yeah i dont like how they didnt bother with standards
09:09 PM XXCoder: do you know in order to change tool, they just use t1 t2 so on with no m6?
09:10 PM XXCoder: dumb
09:10 PM XXCoder: and t0 isnt no tool as cnc standard
09:10 PM CaptHindsight: they use M codes for temp
09:10 PM roycroft: the great thing about standards is that everybody has their own
09:10 PM XXCoder: https://imgs.xkcd.com/comics/standards.png
09:10 PM Tom_L: same with cereal standards way back...
09:11 PM CaptHindsight: captn crunch
09:11 PM Tom_L: M104 is temp
09:11 PM XXCoder: im not sure how lcnc would do resin actually
09:11 PM Tom_L: http://www.makeit-3d.com/wp-content/uploads/RepRapGcodeCheatSheet.pdf
09:12 PM XXCoder: how do reprap type handle resin?
09:12 PM CaptHindsight: g-code moves for Z
09:12 PM CaptHindsight: display next slice (image on LCD, DLP etc)
09:13 PM norias: oi
09:13 PM XXCoder: precisely not sure if lcnc has support for latter
09:13 PM XXCoder: z is simple
09:13 PM CaptHindsight: SVG layers
09:14 PM CaptHindsight: https://matrix.org/_matrix/media/r0/download/matrix.org/WJhoZdzdZQSrtvrgbeWdsfIJ
09:14 PM CaptHindsight: https://matrix.org/_matrix/media/r0/download/matrix.org/kdySZtKczKAwdIQFMTMvXpbl
09:14 PM CaptHindsight: SVG layers are all numbered
09:14 PM XXCoder: interesting
09:14 PM XXCoder: that is lcnc?
09:15 PM Tom_L: is that pyvcp?
09:15 PM CaptHindsight: qtpyvcp yeah
09:15 PM XXCoder: nice
09:15 PM Tom_L: that's what i meant
09:15 PM XXCoder: ui looks nice
09:15 PM CaptHindsight: was a quick hack by turboss
09:15 PM CaptHindsight: i have to make a nice one
09:16 PM XXCoder: really
09:17 PM CaptHindsight: those guys wave python around like a chef at Ron of japan flings shrimp
09:18 PM CaptHindsight: he cobbled that one evening for me as an example since i hate code
09:21 PM XXCoder: lol
09:35 PM roycroft: speaking of shrimp, i just made some amazing szechuan shrimp fried rice
09:35 PM roycroft: i hope i can remember how i made it so i can make it again
09:35 PM CaptHindsight: thanks now I'm hungry again
09:36 PM CaptHindsight: well it's space suit time again
09:43 PM XXCoder: painting? or covid protection?
09:44 PM roycroft: so yesterday i drilled and tapped a 1/2"-13 test hole in a piece of ash to try to ascertain how strong it is and what size hole to drill
09:44 PM roycroft: i noticed that there was virtual no "wood swarf" when i ran the tap down
09:44 PM roycroft: it seemed more like it was a formed thread than a cut thread in that respect
09:44 PM roycroft: i was able to run a bolt down about 1-1/2" by hand
09:44 PM roycroft: and it did not wiggle, so i thought things were good
09:45 PM roycroft: i just went to remove it, and i had to use a 1/2" ratchet and push on it pretty hard to turn the bolt
09:45 PM roycroft: so i suspect that the tapping operation did more compression than cutting
09:45 PM roycroft: this is all very good, but not what i expected
09:51 PM Rab: roycroft, sounds like a recipe for eventual splitting. What type of tap? And into the end grain, or cross grain?
09:52 PM CaptHindsight: XXCoder: isocyanates
09:52 PM XXCoder: read effects. sounds like fun chemical
09:53 PM CaptHindsight: side effects from nothing to death
09:53 PM CaptHindsight: feeling lucky?
09:59 PM XXCoder: nah
10:06 PM jymmmm: crazyglue?
10:07 PM Tom_L: different structure
10:09 PM jymmmm: ah
10:11 PM roycroft: cross grain
10:11 PM roycroft: and a standard metal tap
10:12 PM roycroft: if it were end grain i'd have figured something else out
10:12 PM roycroft: it won't split
10:13 PM roycroft: and it's the dry season, so the wood is at about 9% moisture
10:13 PM roycroft: i'm not guessing on that - i measured it with a moisture eter
10:14 PM roycroft: meter
10:14 PM roycroft: in a couple dozen places, actually