#linuxcnc Logs

Jul 14 2020

12:22 AM flyback: https://www.hollywoodreporter.com/news/grant-imahara-dead-mythbusters-host-was-49-1303101
01:39 AM veegee: Hmmm running a propane forklift indoors
01:39 AM veegee: I should probably make a hose to vent the exhaust outside
01:40 AM veegee: some kind of rubber air hose should be sufficient if I can cool the exhaust through a radiator or something first
01:41 AM veegee: then I can hang it from the ceiling and out one of the vent ports in the wall
01:42 AM veegee: operating radius is not that large, hose getting in the way shouldn't be an issue
01:44 AM veegee: Calculator says 150 ish CFM for a 3L engine at 3600 RPM max throttle. Not going to be anywhere near that of course so I'm hoping a 1/2" air hose will do
01:45 AM veegee: exhaust backpressure shouldn't hurt it
04:51 AM JT-Cave: morning
06:52 AM Tom_L: morning
08:18 AM Loetmichel: hehe, list got the Elegoo Mars 3d-printer... already printing the test file... sadly it doesent have any network connection... that will be a hassle to carry a thumbdrive around... but i am not THAT upset, an UV-resin printer for 260 eur incliding 1kg resin you cant ask for that much.
08:45 AM JT-Shop: now a days a bank visit is via email lol
09:31 AM Rab: Loetmichel, I've been looking at those cheap resin printers, so I'm very interested to hear your continuing experience.
09:33 AM Loetmichel: Rab: first experience: the rooks take forever to print ;)
09:34 AM Rab: Do you have the version with the stronger UV light source? https://smile.amazon.com/dp/B07XHK1SW1
09:42 AM gregcnc: how long has this one been around? I was looking at anycubic photon last year but it needed the rail upgrrade
09:47 AM Rab: About a year, I think. There are a few similar printers, just rebrands I guess.
09:58 AM Loetmichel: Rab: i have no idea
09:59 AM Loetmichel: it IS a new one, sadly
09:59 AM Loetmichel: the old version had an RJ45 on the mainboard that could be used with a modified firmware to print over network
11:17 AM sliptonic: Does the linuxcnc flavor of gcode accept a dwell parameter on a G83 peck?
11:17 AM JT-Cave: the manual would tell you
11:19 AM sliptonic: It doesn't like a P word as an option but doesn't exclude it either. I'm finding that that various controls are inconsistent on this point.
11:19 AM jymmmm: sliptonic: http://linuxcnc.org/docs/2.4/html/gcode_mill_canned.html
11:19 AM gregcnc: yes controls are different
11:21 AM jymmmm: Hmmm, I dont see the actual dweel in the example on that page, thugh it states it in the description
11:22 AM sliptonic: They don't seem consistent even with what dwell means. Sometimes dwelling at the last peck, sometimes on every peck
11:24 AM gregcnc: http://linuxcnc.org/docs/2.7/html/gcode/g-code.html#gcode:g82
11:26 AM jymmmm: gregcnc: In the link I gave, they mention dwell 0.25s, but I don't see it in the example gcode they give
11:26 AM sliptonic: That's the page I started with. Looks like the mention of 'dwell' was removed between 2.4 and 2.7
11:26 AM gregcnc: g82 supports dwell but it's doesn't look like G83 does. I've never tried.
11:28 AM gregcnc: all controls are different and even the same can vary slightly between machine builders or versions
11:29 AM JT-Cave: quite possible as the manual in 2.4 was a copy and paste mess that took me years to sort out
11:29 AM jymmmm: http://linuxcnc.org/docs/html/gcode/g-code.html#gcode:g4
11:29 AM andypugh: https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/rs274ngc/interp_cycles.cc#L140
11:30 AM andypugh: No consideration of a dwell parameter in the cycle code
11:30 AM JT-Cave: nice link
11:31 AM jymmmm: andypugh: How Rude, going straight to the source and keeping it simple and to the point ;)
11:31 AM sliptonic: Thanks andypugh. I've been implementing features in FreeCAD Path to stay close to linuxcnc capabilities. If something works in linuxcnc it seems to work in other controls too. Not always true the other way around.
11:32 AM sliptonic: For instance, Haas has some great improvements to peck drilling that vary the depth of each peck. Makes the cycle MUCH faster but those improvements are haas only.
11:33 AM andypugh: I like G73
11:34 AM sliptonic: I probably need to study that more closely. We can probably improve our postprocessor there
11:36 AM skunkworks: I use g73 a lot..
11:37 AM skunkworks: https://youtu.be/bUJg200Sf9s
11:38 AM skunkworks: andypugh: looks like lathe roughing/finishing cycles are only in 2.9/master?
11:38 AM jymmmm: skunkworks: was that micro pecking?
11:39 AM skunkworks: jymmmm: it backs up just slightly every so often for chip breaking
11:40 AM jymmmm: skunkworks: Ok, wasn't sure if it was an illusion or not, such a TINY back move =)
11:40 AM skunkworks: andypugh: interp version..
11:54 AM jymmmm: JavaBean: I just remembered, they spray that borax solution on bags of landscaping bark so it doens't become fire tinder =)
11:59 AM skunkworks: andypugh: very cool on the lathe roughing/finishing cycles.
12:01 PM andypugh: Yes, G71/G72 are only in master. And the docs are poor.
12:01 PM andypugh: I made what I thought were decent docs for my remap, but they use all different letters to the ones that got merged.
12:04 PM skunkworks: andypugh: that is ok. It has a gcode example. That really helps
12:47 PM Tom_L: skunkworks, on g73 you can specify the retract distance right?
12:48 PM Tom_L: G83 is full retract
12:57 PM JT-Shop: crap the punched channel will be here tomorrow
12:58 PM JT-Shop: I hope the 20' channel is not mangled like last time
12:59 PM * JT-Shop reminds himself to not take on any more fence jobs
12:59 PM gregcnc: I'll have to look into the lathe cycles. Maybe i'll get around to finishing that lathe I started ages ago.
01:02 PM gregcnc: syyl did I see a Zeus 231 in your feed recently? It looks like a tool I need
01:13 PM CaptHindsight: Rab: the resin printers have become lower cost and more closed source
01:14 PM CaptHindsight: the print areas are not very large, they use a cell phone or tablet LCD screen
01:15 PM CaptHindsight: the cheap Chines ones all use the same controller and have wifi
01:21 PM CaptHindsight: https://www.chitubox.com/
01:22 PM Rab: CaptHindsight, I suppose I could tolerate closed source firmware if it wasn't total crap (which doesn't seem unlikely, all things considered). My oscilloscope has closed firmware too. I'm more concerned with ruggedness of the print, and hoping it could approximate injection-molded ABS or polycarbonate.
01:22 PM CaptHindsight: https://home.cbd-3d.com/hardware/controller-board/chitu-l-m18-9-4k-monochrome/
01:23 PM CaptHindsight: I and other make resins like that but they are the low cost versions
01:23 PM CaptHindsight: the raw materials just cost more
01:24 PM Rab: The goal is something like an action camera housing: kinda waterproof, looks OK, strong enough for e.g. fastener bosses, can step on or throw out of a car, won't turn to dust in the sun, etc etc.
01:26 PM Rab: Something that holds up where FDM fails those criteria. It doesn't have to be particularly cheap, it's for low volume.
01:28 PM CaptHindsight: well FDM can print Nylon and ABS
01:29 PM CaptHindsight: photopolymers are just not the same
01:30 PM CaptHindsight: they can be similar in some ways but they are not thermoplastic, they are like thermosets only rather than heat, they polymerize by light energy
01:30 PM CaptHindsight: so they don't reflow like thermosets
01:31 PM CaptHindsight: so a boss for fastener should be inserted during the print process vs after via an ultrasonic welder or just a press
01:31 PM CaptHindsight: bottom up doesn't allow you to insert components into the print
01:31 PM CaptHindsight: top down does
01:32 PM Rab: CaptHindsight, sounds like plastite and other thread-forming fasteners are contraindicated?
01:33 PM CaptHindsight: my approach to the camera body would be a tough urethane for the skeleton with a softer flexible urethane outer skin with fasteners inserted while printing that are captured in place
01:34 PM Rab: I guess I could try printing threads for specifically chosen fasteners. I did intend to try printing functional 3/4-14 threads to mate with a PVC fitting.
01:34 PM CaptHindsight: Rab: if you body was made of cast epoxy that you are likely familiar with, how would you capture fasteners in it?
01:35 PM CaptHindsight: you/your
01:35 PM CaptHindsight: sorry light touch to the keyboard today, keep missing letters
01:36 PM Rab: CaptHindsight, that picture's worth a thousand words, thanks. I certainly wouldn't try thread forming, or inserts after casting.
01:37 PM CaptHindsight: I'm thinking about offering 3d print services since i can print things that nobody else can
01:38 PM Rab: So probably introducing inserts during casting, or special voids which could constrain inserts without deformation, or just some other clever fastening method that sidesteps the problem.
01:38 PM CaptHindsight: LCNC lets me combine print tech to make hybrid printers
01:38 PM CaptHindsight: everyone else is stuck with software dedicated to one type of tech
01:39 PM CaptHindsight: Rab: now you have it
01:41 PM CaptHindsight: other options might be using a water soluble support material that acts as a mold
01:42 PM CaptHindsight: the insert gets captured and then the support is rinsed away after printing
01:42 PM Rab: Hmm, yeah.
01:43 PM CaptHindsight: if you use a 4k screen that is small the pixel pitch is also small
01:43 PM CaptHindsight: so you can print some small threads
01:44 PM CaptHindsight: if you get really fancy you can use and inverse microscope and get down to 1um features and then step the light engine over the print area
01:45 PM CaptHindsight: step the raster over a greater area than the area of the raster
01:45 PM Rab: Heh, I don't think I could trust threads at that scale not to crumble under torque.
01:46 PM CaptHindsight: I've gotten pretty close to aluminum using aluminum in resin
01:46 PM CaptHindsight: it is a paste at this point
01:47 PM CaptHindsight: at that point it's like printing metal
01:48 PM CaptHindsight: the resin loading is so low that you can bake the part to burn the resin out and sinter the metal powder
01:49 PM CaptHindsight: another option is jet fusion
01:50 PM CaptHindsight: https://i.materialise.com/blog/wp-content/uploads/2017/03/hp-jet-fusion-sample-3d-print.jpg
01:52 PM CaptHindsight: or print a low volume mold and inject
01:52 PM CaptHindsight: all depends on the finish and other qualities
01:53 PM CaptHindsight: Rab: the limiting factor of the cheap resin printers is that they are bottom up and require resins that are under ~1,000cPs, similar to honey
01:54 PM CaptHindsight: since the resin needs to flow under the part to make the next layer, if the resin is too thick it will take a long time to flow
01:54 PM CaptHindsight: so prints rates will be glacial like FDM/FFF
01:55 PM Rab: CaptHindsight, I see.
02:02 PM gregcnc: capt how many source of epoxy resins are there? I was looking for a high temp and it was surprising how many were out there
02:02 PM gregcnc: i thought like most industries, there was a lot of repackaging
02:03 PM CaptHindsight: gregcnc: two part epoxies? several
02:03 PM gregcnc: yes
02:03 PM CaptHindsight: the raw materials come from a dozen or so sources
02:03 PM CaptHindsight: you just have to be able to buy by the drum
02:05 PM CaptHindsight: the money seems to be in packaging in small volumes with some marketing spin on how yours is so wonderful
02:05 PM gregcnc: yeah
02:08 PM gregcnc: I found this https://theepoxyexperts.com/wp-content/uploads/2017/05/MAX-HTE-AB-TDS.pdf which seems pretty decent and reasonably priced for the qty I expect to use
02:09 PM gregcnc: biggest differnce among brands seemed whether or not they could be removed from the mold prior to post cure
02:11 PM JT-Shop: and don't forget the label must have 50% better, stronger, more, lighter, faster etc.
02:12 PM gregcnc: well that's why TDS
02:14 PM miss0r2: Just started milling the overly complicated busbars for the land rover :D https://imgur.com/a/aPymyR6
02:16 PM Tom_L: and a gorilla on the cover
02:21 PM CaptHindsight: gregcnc: are you casting epoxy?
02:22 PM gregcnc: closed mold hand carbon layup
02:22 PM miss0r2: What is that?
02:22 PM gregcnc: or bagged, will have to try both methods to see what works best
02:23 PM CaptHindsight: I'm going to build a CF weaving multiaxis resin printer
02:24 PM CaptHindsight: gregcnc: are your parts solid or mostly shells?
02:24 PM gregcnc: shells
02:33 PM gregcnc: I was looking for something else, but came across this https://www.youtube.com/watch?v=N7a1MllMcOo
02:45 PM Tom_L: some light poles are wound like that
02:50 PM CaptHindsight: planar and cylinders (wrapped plane) are easy
02:54 PM CaptHindsight: I need to crotchet CF into shapes https://youtu.be/nTz_h-CkaC4?t=19
02:54 PM Tom_L: indestructable flowers?
02:54 PM gregcnc: https://xwinder.com/
02:56 PM CaptHindsight: Tom_L: don't forget hats
03:57 PM miss0r2: CaptHindsight: I finished the battery busbars: https://imgur.com/a/WOgSXF6
04:03 PM miss0r2: I'm off for the night. See you around
04:48 PM -!- #linuxcnc mode set to +v by ChanServ
04:57 PM skunkworks: Tom_L: i dont think so..
05:29 PM Tom_L: skunkworks, i thought the R was the retract and Q the 'peck' retract
05:30 PM Tom_L: or is Q the drill depth each peck cycle?
05:35 PM Tom_L: huh, the code sets the G73 rapid_delta the same as G83. i dunno if that's the peck return or not though
06:08 PM Tom_L: no, it's hardcoded to .010"
06:11 PM Tom_L: in interp_internal.hh
06:21 PM skunkworks: Tom_L: knew you would get there.. ;)
06:21 PM XXCoder: shop closed today. postive covid on one of coworkers
06:22 PM Tom_L: i'm not sure which one i code in my post
06:26 PM XXCoder: hope that coworker is ok
06:27 PM Tom_L: you gotta get tested?
06:27 PM XXCoder: should be yeah. how expensive is it anyway
06:27 PM XXCoder: thankfully I always wore mask at work
06:27 PM Tom_L: the company should pay
06:27 PM XXCoder: helps a little
06:27 PM Tom_L: iirc 250?
06:27 PM Tom_L: i'm not sure
06:28 PM Tom_L: same happened at my kid's work
06:28 PM Tom_L: 14 day quarantine
06:29 PM Tom_L: test came back neg on day 15
07:12 PM flyback: https://www.goldmine-elec-products.com/prodinfo.asp?number=G24974
07:16 PM skunkworks: for the love.. why?
07:16 PM Tom_L: old car tube radios
07:17 PM Tom_L: (before you were born)
07:18 PM skunkworks: I know - but why? There are way better ways now..
07:18 PM Tom_L: of course
07:18 PM Tom_L: you can get a chip radio that sits on your pinkie nail now
07:20 PM Tom_L: goldmine has alot of old crap
07:36 PM perry_j1987: what do you guys think of the pm-728vt
07:43 PM skunkworks: it's a mill?
07:44 PM skunkworks: looks pretty
07:49 PM Tom_L: green is prettier
07:50 PM skunkworks: heh - yellow too https://youtu.be/wv7mMS5xKks
07:53 PM Tom_L: saw that one
07:54 PM skunkworks: or red - or blue
07:54 PM roycroft: you can still make a crystal radio that fits in your palm, and requires no power
07:54 PM roycroft: that's old old school
07:55 PM skunkworks: eh..
07:55 PM XXCoder: im pretty sure you can flame polish ends to make ends more transparent but cool nevertheless https://www.youtube.com/watch?v=WUwjq1zZCis
07:56 PM JavaBean: thanks jymmmm, just got your warning
07:57 PM jymmmm: XXCoder: flame polish acrylic?
07:58 PM XXCoder: yeah
07:58 PM jymmmm: XXCoder: Yeah, you should use oxy-propane if you can.
07:59 PM jymmmm: JavaBean: no worries, your welcome
08:00 PM jymmmm: roycroft: http://www.sparkbangbuzz.com/easy-ten/easy-ten.htm
08:07 PM jymmmm: XXCoder: MAPP gas can leave soot in the finished result
08:07 PM XXCoder: ya I dont plan on doing it myself
08:08 PM XXCoder: just was commenting that he could do it in order to improve end result a little
08:09 PM jymmmm: laser will polish the edges, or manually but that takes time. Flame polishing takes a bit of practice
08:11 PM JavaBean: jymmmm: could you help me out a sec... who was the dude with the chickens in here?
08:11 PM jymmmm: JT
08:12 PM jymmmm: JavaBean: JT built a automated Chicken hotel and resort =)
08:12 PM JavaBean: JT? thanks.... hey JT!! found you a neato for your chickens https://twitter.com/Marie_la_F/status/1283082121662390272?s=20
08:12 PM JavaBean: i remember, jymmmm. that's why i had to send him that
08:14 PM jymmmm: haha, nice