#linuxcnc Logs

Nov 18 2019

#linuxcnc Calendar

12:11 AM elmo40: net|, what is this image?
12:16 AM elmo40: _unreal_, so... what actually moves?
12:16 AM XXCoder: I wondered. its without context heh
12:16 AM elmo40: appears to be an online interpreter?
12:16 AM XXCoder: yeah. or emulator that might be display on top
12:16 AM elmo40: _unreal_, why not close up the box? makes everything better.
12:16 AM elmo40: but that plywood appears to be thick. 3/4" is it? i guess it would hold up... though a full All box is what i'd do ;-)
12:18 AM elmo40: one worm drive Z with a common belt to drive 2 screws (or 4. unsure yet. it will be a 1m x 1m bed after all...)
12:19 AM elmo40: i want to cast the top section out of Aluminum. need to make a few models to get everything where i want them then go to a foundry with my mold.
12:19 AM elmo40: it will be the most rigid 3D printer i have ever seen!
12:20 AM SpeedEvil: Take a block of granite and carve out whatever is not a 3d printer
12:20 AM elmo40: ;-)
12:20 AM elmo40: i'll get back to you in 15 years when i'm done...
12:21 AM elmo40: gecko drives are what i'm looking into. there are so many options.
12:21 AM elmo40: does lcnc handle 3d printer gcode? using E for example?
12:23 AM elmo40: for example, i do not see this one
12:23 AM elmo40: M82 - set extruder to absolute mode
12:23 AM elmo40: and the fan stuff. M107 and whatnot. i guess i can use other codes for fans.
12:24 AM elmo40: M190 and M109 for heater elements.
12:25 AM elmo40: i suppose G90 is absolute mode. why would they have M82 for that?
12:26 AM elmo40: G92 is there. i have seen many Cura made files that reset the E for some reason.
12:26 AM elmo40: begins from 0 again.
12:27 AM elmo40: i'd still like to see a MasterCAM Slicer. That would kick ass!
12:28 AM elmo40: i sliced a cube. the corners are never the same coordinates at every line!! like, wtf bro?? makes you wonder how it can make a good part if it is giving bad positioning values...
12:28 AM elmo40: 3D printing is limited to the slicer, i can see that now.
12:30 AM elmo40: my main issue, though, is the lack of G2/G3. I think it is partly due to STL files and their horrible triangulation of shapes. the slicer doesn't even receive a circle to print but a bunch of tiny triangles... still, if the triangle is small enough it should interpolate a circular path from it.
12:31 AM elmo40: adding a G4 to some corners would help define them. i wonder if my current machine can handle that... going to test right now! would be nice. some infill lines never have the time to touch a wall and create blobs on the inside with weakened wall sections because of it.
02:10 AM Deejay: moin
04:54 AM Tom_L: morning
04:55 AM jthornton: morning
04:56 AM XXCoder: morning
04:56 AM Tom_L: 42F, Hi 70
04:57 AM Tom_L: warmin back up
04:57 AM XXCoder: 48f-48f
04:58 AM jthornton: 39°F here
08:52 AM SpeedEvil: Is superelastic NiTi good for energy storage springs - better than just carbon steel? From the perspective of energy stored per cc
08:53 AM SpeedEvil: (I may be overthinking my design for a badge retractor)
08:53 AM Loetmichel: did you consider rubber?
09:44 AM net|: https://i.imgur.com/JXewoZU.png 500 sq feet
09:46 AM Loetmichel: stillno studs/frames in the calculation
10:07 AM net|: https://i.imgur.com/OwQIJAR.png
10:07 AM net|: was still working on it
10:09 AM jymmmm: Make drawers/boxes easily, pretty slick... https://www.youtube.com/watch?v=S074ke-EJ6U
11:36 AM SpeedEvil: net|: making a tiny horse?
12:24 PM Deejay: re
12:45 PM net|: https://i.imgur.com/294McOT.jpg boards came out good but 2mm pinheaders are not standard i need to go bigger.
01:03 PM jymmmm: Blackout tentative Tuesday thru Thursday
01:52 PM miss0r: 'evening
03:05 PM JT-Shop: yo
03:06 PM XXCoder: heys
03:11 PM jymmmm: Yo ho ho and a bottle of rum!
03:11 PM jymmmm: YUM!
03:11 PM XXCoder: too much rum there
03:11 PM jymmmm: NEV-AH
03:12 PM jymmmm: That Malibu Coconut rum is really good :)
03:12 PM XXCoder: I can smell rum here from there, and its though internet... and I cant smell too
03:12 PM XXCoder: its just that strong
03:13 PM jymmmm: That... would be tequlia, not rum
03:13 PM XXCoder: lol
03:14 PM jymmmm: XXCoder: I'm thinking you might be a funny drunk "Yeah, let's all fuck with the deaf drunk guy" :D
03:14 PM XXCoder: lol yeah good luck catching me drunk
03:15 PM jymmmm: whys that?
03:15 PM XXCoder: I havent drank for hmm oh one or 43 years or so
03:15 PM jymmmm: Well, there's always a first time
03:15 PM XXCoder: maybe if someone forces it in me
03:16 PM jymmmm: Would you take a sip at least?
03:16 PM XXCoder: nope
03:16 PM jymmmm: to taste?
03:16 PM XXCoder: note im not against alchol simply refuse to drink
03:17 PM jymmmm: That coconut rum tastes REALLY good, and I don't drink all that much
03:32 PM net|: https://www.ebay.ca/itm/174100200571
03:48 PM jymmmm: XXCoder: Got Bucket??? https://www.youtube.com/watch?v=GE7QA1chUzw
04:16 PM Deejay: gn8
04:50 PM * Javabean wonders if this is something someone here has tried.... NSFW, Language
04:50 PM Javabean: https://www.youtube.com/watch?v=84_Oa52sxfc "I watched a couple videos on YouTube"
06:46 PM _unreal_: sup
06:46 PM _unreal_: Javabean, never heard of it
06:53 PM _unreal_: no one around tonight
06:53 PM _unreal_: sigh
06:53 PM Loetmichel: not true
06:53 PM Loetmichel: :-)
06:56 PM _unreal_: heh
06:56 PM _unreal_: so I'm going with rushed servos for my new home cnc machine
06:56 PM _unreal_: just for the hell of it
06:57 PM _unreal_: I'd rather use brushless but I have half of what I need for brushed servos on hand so I may as well stick with this. and save my self some $ gree
06:57 PM _unreal_: green
07:01 PM Loetmichel: brushed servos are simpler to drive so drivers tend to be cheaper
07:04 PM _unreal_: bs
07:04 PM _unreal_: show me a cheap brushed servo driver
07:04 PM _unreal_: I'm expecting to pay around $300 just for the controllers
07:23 PM pcw_mesa: Cheap brushed motor driver:
07:23 PM pcw_mesa: https://www.ebay.com/itm/US-Dual-Motor-Driver-Module-Board-H-bridge-DC-MOSFET-IRF3205-3-36V-15A-Peak30A/264472008972?hash=item3d93c2990c:g:bEIAAOSwU0tdhJFA
07:24 PM Loetmichel: _unreal_: google if UHU is still around
07:24 PM Loetmichel: UHU servo that is
07:25 PM Loetmichel: pcw_home: i think he meant a servo drive
07:25 PM Loetmichel: so including the counters for an Encoder and step/dir input
07:25 PM Loetmichel: or whatever there is on interfaces to the PC
07:26 PM pcw_mesa: That is a servo drive (at least for LinuxCNC that can do PWM and read encoders)
07:30 PM Loetmichel: pcw_mesa: that is a h-bridge. so only the amplifier part of a servo drive. what you describe is a "software" servo drive IMHO
07:30 PM Loetmichel: or if one uses one of your cards a "semi-software" drive ;)
07:31 PM Loetmichel: but that said there is a new kid on the block IIRC. Odrive can make model brushless motors into fully fledged servo drives for really cheap
07:31 PM Loetmichel: "new"
07:32 PM Loetmichel: i am not really up to date on that though
07:33 PM pcw_mesa: Right but that is normally what LinuxCNC does (it almost always closes the position loop in software)
07:33 PM Rab: This seems pretty cheap to me, haven't looked up the specs: https://www.ebay.com/itm/362590697746
07:34 PM CaptHindsight: I find AC servos and drives on ebay for cheap quite often
07:35 PM CaptHindsight: http://manuals.chudov.com/A-M-C/30A8-Datasheet.pdf
07:35 PM CaptHindsight: 80V 15A brushed servo amp
07:36 PM CaptHindsight: + - 10V input
07:36 PM pcw_mesa: Analog interface and assumes Tachometer velocity feedback
07:37 PM CaptHindsight: Tach input on the cover pic
07:38 PM Rab: _unreal_, do you have a part number for your servos? And do you know what kind of position sensing they use?
07:38 PM CaptHindsight: https://www.ebay.com/itm/80V-20A-Servo-Drive-upgrade-Geckodrive-G320X-DG4S-08020-DCS810-Mach3-CNC-Router/322460600468
07:38 PM pcw_mesa: CaptHindsight: http://freeby.mesanet.com/5i25_7i76xy2modx1.bit
07:39 PM CaptHindsight: I don't think he wants to perform any calculations
07:39 PM CaptHindsight: he just wants to feel his way to making the mill
07:39 PM CaptHindsight: pcw_mesa: thanks
07:40 PM pcw_mesa: I think what he has are Decwriter carriage motors (24V ~3A cont) 500 line encoder
07:41 PM CaptHindsight: https://www.orientalmotor.com/motor-sizing/ballLeadScrew-sizing.html#
07:41 PM CaptHindsight: just fill in the blanks
08:19 PM _unreal_: LOL pcw_mesa that is NOT closed loop
08:20 PM _unreal_: Loetmichel, i have the files somewhere but I'm not likely to go for the uhu
08:20 PM _unreal_: Rab, more or less 3 of these https://www.ebay.com/itm/Hitachi-1214659-00-24VDC-2-2Amp-33W-Permanent-Magnet-Motor/162524518044?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
08:21 PM _unreal_: I think its 1000 lines per rotation
08:21 PM _unreal_: but i'm not sure
08:21 PM _unreal_: it is quadrature encoder regardless
08:23 PM _unreal_: CaptHindsight, I tell ya what when I get the chance I'll get with you over solving my ##'s
08:23 PM pcw_home: It is closed loop if the PWM is driven and Encoder are read by LinuxCNC (a common configuration)
08:24 PM _unreal_: HEH
08:24 PM _unreal_: my home system I need to use a hardware closed loop
08:24 PM pcw_home: Ok so not LinuxCNC?
08:27 PM _unreal_: or ARE i
08:54 PM CaptHindsight: _unreal_: use the calculator ^^
09:02 PM * jymmmm hands CaptHindsight an abacus
09:07 PM skunkworks: Closing the loop within linuxcnc has a few advantages..
09:10 PM drdoc: CaptHindsight: Math is HARD
09:11 PM drdoc: ...so is printing PLA
09:22 PM skunkworks: so - math is easy?
09:24 PM drdoc: math is a lot easier than hit & miss
09:25 PM drdoc: but my experience is that most people would rather miss
09:25 PM drdoc: skunkworks: this is the first roll of PLA I've run in a couple of years
09:26 PM drdoc: I'd forgotten how picky it is about cooling
09:27 PM skunkworks: heh - Yes - it likes almost as much cooling as you can
09:27 PM skunkworks: https://www.youtube.com/watch?v=YEPBl9W6PyE
09:29 PM _unreal_: jymmmm, LOL
09:46 PM jymmmm: skunkworks: Nice, how long did it take to print?
09:47 PM drdoc: skunkworks: I'm using a part fan duct that works *really* well
09:47 PM drdoc: running PETG, I usually run the part fan at 10%
09:48 PM jymmmm: g'night folks,
10:04 PM skunkworks: drdoc: don't remember... probably a dayish
10:05 PM drdoc: 'twasn't me
10:06 PM drdoc: ok... it looks ike 10% fan works for the PLA too
10:07 PM drdoc: Fun Fact: the Mostly Printed CNC guys recommend PLA
10:07 PM drdoc: it's more rigid than most anything else
10:08 PM drdoc: I printed my prototype gantry plates in PETG, mostly because I had 2 tail-end rolls to use up
10:09 PM drdoc: they're pretty flexy
10:11 PM drdoc: so v0.2 is gonna be PLA, and the production version will be 8mm aluminum.
10:12 PM ziper: that doesnt sound right but I don't know enough about pla to dispute it
10:12 PM drdoc: it's true, depending on the brand
10:12 PM drdoc: PLA "Pro" or "Plus" usually isn't, but the dirt cheap stuff is a lot more rigid than ABS or PETG
10:13 PM drdoc: not harder or more durable, just more rigid
10:14 PM drdoc: ziper: I wouldn't be using it at all if I planned to run these parts into spring
10:14 PM drdoc: by May it'll be hot enough in the garage for the PLA to start sagging under its own weight
10:14 PM ziper: the firgues i found indicated some 30percent stiffer
10:15 PM drdoc: yup
10:15 PM ziper: i guess thats pretty decent
10:15 PM drdoc: but you can't tap a hole, and its glass transition is *very* low
10:15 PM ziper: can you tap ABS?
10:16 PM drdoc: yes, if you're not running screws in & out a lot
10:16 PM ziper: use a machine screw or a wood screw?
10:16 PM drdoc: ABS, I usually use wood screws
10:17 PM drdoc: Polycarbonate, machine screws
10:17 PM drdoc: PETG, depends on the part
10:17 PM ziper: i've been trying to print PC but my firmware won't let me
10:17 PM drdoc: what printer?
10:18 PM ziper: cr-10. I finally got a bootloader on it, so i'm going to reflash with marlin
10:18 PM drdoc: a lot of the Reddit guys swear by Polymaker's Poly-Max
10:18 PM ziper: also on this one part I just can't get the ABS to not warp. even with an enclosure and a 100C+ bed
10:18 PM drdoc: relatively low hotend and bed temps without sacrificing much
10:19 PM ziper: the parts are totally useable as-is, I just can't take it
10:19 PM drdoc: PC won't be better
10:19 PM ziper: I already have 110v bed and metal hotend
10:19 PM drdoc: I read a random comment in a random post a few months ago that solved most of my warping issues
10:20 PM drdoc: I run a 24V bed and a Dyze hotend
10:21 PM drdoc: anyway, the poster mentioned that PC warps a lot less when you match infill and top/base/wall thicknesses
10:21 PM drdoc: IOW if you have thick wall and a lot of solid top & bottom layers but low infill percentage, the warping will be a lot harder to control
10:21 PM ziper: these parts had very little infil
10:21 PM drdoc: and vice versa
10:22 PM ziper: here, i'll post a pic
10:22 PM ziper: https://puu.sh/ECWlB/ddaac238f8.jpg
10:22 PM drdoc: so, thin walls, thin top & botton, low infill
10:22 PM drdoc: that's gonna be tough
10:23 PM ziper: its entirely structural
10:23 PM ziper: the only infill is around the fillet
10:23 PM drdoc: I'd go big, big brim
10:23 PM drdoc: I use Gizmo Dorks PC, no "alloying"
10:24 PM drdoc: 310 hotend, 135-140 bed, gluestick on PEI
10:24 PM ziper: that happens to be the one I have
10:25 PM ziper: I couldn't get the PEI to work, just been using glass
10:25 PM drdoc: If you can adjust for a little flex, I'd print that part in PETG
10:25 PM ziper: it would warp and not stay on the bed
10:25 PM drdoc: using a brim, or raft?
10:25 PM ziper: brim
10:25 PM drdoc: you might need a raft for that one
10:26 PM ziper: the brim would stay attached far away from the print, but in the high stress area near the print, it would lift
10:26 PM drdoc: there's not enough footprint to hold it down
10:26 PM ziper: yeah, so I made this one too http://puu.sh/EGeFG/958528c000.jpg
10:26 PM ziper: it came out marginally better
10:26 PM drdoc: PETGlol
10:26 PM drdoc: lol
10:27 PM ziper: i hate it
10:27 PM drdoc: I keep middle-clicking your renders to see the other sides
10:27 PM drdoc: ha5te petg?
10:27 PM ziper: its stringy and ugly and it oozes everwhere
10:28 PM drdoc: it does string, and it usually needs more postprocessing than PLA or ABS
10:28 PM drdoc: but it is some strong, strong stuff
10:28 PM ziper: and no acetone
10:28 PM drdoc: nope
10:28 PM ziper: the round part rubs on a carbon fiber spar
10:28 PM drdoc: sandpaper, baybee!
10:28 PM ziper: thats why i've been using ABS, so i can smooth it
10:29 PM drdoc: ah
10:29 PM drdoc: I think you're gonna need a pretty wide raft
10:29 PM ziper: and I would pick up some DCM once I get the PC working
10:30 PM ziper: I might try a 2 layer brim too, but cura doesnt support it
10:30 PM drdoc: for PC or for ABS
10:30 PM ziper: I guess I could just put it in the model
10:30 PM drdoc: also
10:30 PM drdoc: if you can get your enclosure up to 50-55C, it helps a *lot*
10:31 PM ziper: i've only had it in the mid 40s
10:31 PM ziper: i need to build a better one so the machine can go in the harage
10:32 PM drdoc: I put a lizard heater in mine
10:33 PM drdoc: that, a 75W incandescent, and a 135C bed gets the enclosure pretty toasty
10:34 PM drdoc: https://smile.amazon.com/gp/product/B079254FFP
10:35 PM drdoc: and this was one of my best Amazon buys:
10:35 PM drdoc: https://smile.amazon.com/gp/product/B00QQ02U42
10:35 PM drdoc: it works amazingly well for a $15 thermostat & relay
10:35 PM ziper: what about motor overheating?
10:36 PM drdoc: I haven't had any problems
10:36 PM ziper: good enough for me
10:36 PM drdoc: they get scary hot, but I haven't lost any steps
10:37 PM drdoc: If I were starting fresh, knowing what I know now, I'd build a very different machine
10:38 PM drdoc: Erik Klein's Eustathios, probably
10:39 PM drdoc: two of the big advantages are a tiny enclosed volume, and all the electronics, including motors, are outside the heated chamber
10:40 PM drdoc: https://github.com/eclsnowman/Eustathios-Spider-V2
10:42 PM drdoc: OK
10:42 PM drdoc: I gotta go finish my laundry
10:42 PM drdoc: maybe even sleep
10:43 PM ziper: gn, cheers
10:50 PM justan0theruser is now known as justanotheruser