#linuxcnc Logs
Oct 12 2020
#linuxcnc Calendar
01:26 AM Deejay: moin
02:01 AM Loetmichel: *COUGH* *WHEEEZE* MAAAN, you get to sprint 1500m to get in time to the local mayors office because the only parking spot is that far away... arrive there juuuust right... do you ting and then be told: the new Passport and ID card will arrive in 11 to 12 weeks... with a gruesome picture because of blood pressure and the wind from running. :(
02:02 AM Loetmichel: AAAND i have broken a bottle of wine in my car. Smells like a whole brewery now :(
02:05 AM XXCoder: heh i can sorta imange how bad it is even if it smells good
02:05 AM XXCoder: i mean constant smell... and cops.
02:05 AM Loetmichel: cops are not a problem.
02:05 AM Loetmichel: but the smell is NOT pleasant
02:06 AM Loetmichel: thought first it was from the Tras truck in front of me
02:06 AM Loetmichel: that bottle was in the passenger foot well for about half a year, was a gift from a customer
02:06 AM XXCoder: usually but if you are pulled over for any reason cop would smell it lol
02:06 AM Loetmichel: probably not the best quality to begin with
02:06 AM XXCoder: that long? trying to car-age it?
02:07 AM Loetmichel: yeah, not a problem in germany. if the cops smell that you have to blow into the alcotest. and as i dont drink and drive thats just an inconvenience
02:08 AM XXCoder: indeed
02:10 AM Loetmichel: just never got to removing it from the car
02:10 AM Loetmichel: i am messy like that
02:10 AM XXCoder: and that is why wine revenged on you
02:10 AM Loetmichel: had to brake hard and some tools fell from the back seat onto the bottle
02:11 AM XXCoder: it slowly brewed up worse smell inside it for revenge and finally strike!
02:11 AM Loetmichel: hehe, yes, that must be it
02:12 AM XXCoder: lol
02:12 AM Loetmichel: if i tell that to the police when they stop me they will send me to the next insane asylum though ;)
02:12 AM XXCoder: in least it dont seem it broke while you was driving?
02:14 AM Loetmichel: it did
02:14 AM XXCoder: doh
02:14 AM XXCoder: suddenly, a smell
02:14 AM Loetmichel: had some tools on the back seat and had to brake hard
02:14 AM Loetmichel: the bottle was in the passenger foot well
02:15 AM Loetmichel: yeah, thought first it was the trash truck in front of me that was the reason to brake
02:15 AM Loetmichel: ... but no, the smell stayed when i took a different route
02:16 AM XXCoder: geez
02:16 AM XXCoder: sometimes i worry if my car have slowly built up a stink inside it
02:16 AM XXCoder: same for my room
02:16 AM XXCoder: its annoying
02:24 AM CaptHindsight: just drive around with an open bucket of hand sanitizer
02:24 AM CaptHindsight: get pulled over, coat hands and face
02:25 AM Loetmichel: more like; pour a couple of gallons of water in the foot well, take a shopvac and vaccuum it out. repeat as neccessary
02:27 AM XXCoder: first, coat everything with wine
02:27 AM XXCoder: as well as dye em evenly heh
03:02 AM miss0r: Goodmorning
03:03 AM miss0r: I have an issue. or possibly an issue. I have two plastic hoses and two 0.75mm^2 wires inside an armor sleeve. These have to me installed realy near to my exhaust manifold. near, as in within 40mm.
03:03 AM miss0r: Do you guys have any suggestions as to what can be done to harden this bundle from the heat?
03:05 AM XXCoder: kaptop tape?
03:06 AM miss0r: TPFE tape?
03:06 AM miss0r: I was considering using some regular duct tape as a buffer & then wrap that in alu tape
03:07 AM XXCoder: im not sure if i spelled it correctly. its yellowish tape that delfects heat very well
03:08 AM miss0r: isn't that stuff usualy used in electronics? I'm not sure it will stand up to the exhaust temperatures
03:12 AM XXCoder: it can stand to soldering temperare
03:12 AM XXCoder: does it get that hot there?
03:12 AM miss0r: I actualy have no idea
03:12 AM Loetmichel: XXCoder: neither can. for longer than a couple seconds
03:12 AM XXCoder: honestly dunno if its best but just remembered that tape type
03:12 AM XXCoder: ah too hot then
03:13 AM miss0r: most exhaust products are rated at 550degrees celcius
03:13 AM miss0r: but theres gonna be air flow between the manifold and the bundle
03:13 AM Loetmichel: kapton tape is only good for 250°C
03:13 AM Loetmichel: may be enough or may be not
03:13 AM miss0r: which might be interrupted at stops, if the engine is not hot enough to start the electric fan. or when you park
03:14 AM Loetmichel: i would try alu or copper tape there.
03:14 AM XXCoder: ya i wasnt sure how hot miss0rs vent was
03:14 AM Loetmichel: the glue may melt, but the metal should stay on track
03:14 AM miss0r: yeah. I just need to add some insulation inbetween the bundle and the alu tape
03:16 AM XXCoder: how about rockwool?
03:18 AM Loetmichel: glass mat would probably be better
03:18 AM XXCoder: its extremely resistant to heat, and fairly. if ebay cheap, but make sure to apply flame to it to see if it is real
03:18 AM XXCoder: fairly thin
03:18 AM Loetmichel: from the car body repair kit
03:19 AM miss0r: I was actualy thinking about wrapping the exhaust in that glassmat stuff
03:19 AM miss0r: that is build for the purpose. But I think it will be a pain and get in the way of bolts ect.
03:20 AM miss0r: Knowing this is not exactly a modern car, I would like to be able to access any and all bolts with some ease :)
03:21 AM Loetmichel: probably best way would be to place a sheet of polished alu in between the bundle and the exhaust.
03:21 AM Loetmichel: with at least a cm of air between both
03:21 AM miss0r: I considered that as well. I'm not sure I can fit it
03:21 AM Loetmichel: will reduce the temperatures at the bundle greatly
03:23 AM miss0r: indeed
04:07 AM jymmmm: miss0r: teflon wire (like used in aircraft) is flame resistant, maybe you could use that?
04:13 AM jymmmm: miss0r: https://www.amazon.com/CM-Ceramics-Ceramic-Insulation-Ceramics-Instructions/dp/B015GD0QCW/
04:17 AM jymmmm: This is interesting, rated up to 2100F https://www.lowes.com/pd/ROCKWOOL-COMFORTBATT-R-15-Stone-Wool-Batt-Insulation-with-Sound-Barrier-15-25-in-W-x-47-in-L/3388304
04:24 AM Loetmichel: there is glass fibre braid insulated wire on the market
04:24 AM Loetmichel: i have used it inside furnaces
04:25 AM Loetmichel: it is good up to temperatures where the copper inside the wire is liquid.
04:25 AM Loetmichel: been there seen that work
04:25 AM Loetmichel: SHOULD be enough ;)
04:29 AM veegee: Sometimes I do the dumbest things
04:29 AM veegee: I always cut the metal lip off the grease cartridge before loading it because it never fit _inside_ the grease gun
04:30 AM veegee: It never occurred to me that it was by design and it's meant to stick out a little bit
04:47 AM veegee: On another note, how is it that my straight 6 allis chalmers engine is quieter than my V twin generator engine?
04:47 AM veegee: Like significantly
04:48 AM veegee: I need to make that damn generator quieter somehow
05:48 AM Loetmichel: veegee: mass dampens sound and vibrations
05:58 AM Tom_L: morning
06:03 AM JT-Cave: morning
06:07 AM Tom_L: 56F hi 78
06:34 AM JT-Cave: cooling off a bit here
06:48 AM jymmmm: veegee: make a dog house for the generator, then put in sound insulation
06:50 AM jymmmm: veegee: rubber horse stall mat and foam sheet insulation should do it
07:08 AM jymmmm: morning
08:31 AM JT-Shop: automation direct is dropping the GS2 drive
08:34 AM CaptHindsight: veegee: exhaust noise or valve train?
08:40 AM CaptHindsight: JT-Shop: replaced by the GS20 and GS3 drives
08:59 AM JT-Shop: yeah that's what the email said
10:11 AM roycroft: i just remembered a big reason i never did the cnc conversion to my mill
10:11 AM roycroft: i need the mill to make parts for the conversion
10:11 AM roycroft: and there's a good chance i'll have to disassemble/reassemble it several times while making the parts and getting them to fit
10:12 AM roycroft: but that's not going to change no matter how long i wait, unless i buy another mill, which is not going to happen
10:12 AM serp: Sounds like you'll need to make a separate mill for cnc
10:13 AM roycroft: the local maker space have a bridgeport mill
10:13 AM roycroft: and their facility is not too far from my house
10:14 AM roycroft: but access is erratic now
10:14 AM roycroft: it always has been somewhat, but it's even more erratic since the pandemic
10:14 AM roycroft: so i'm not sure that using their mill is an option, even if i were willing to rewew my membership
10:15 AM roycroft: if i'm lucky, and i plan and measure everything very carefully, i might get away with only a couple rounds of disassembly/reassembly
10:17 AM serp: does your makerspace close for members?
10:19 AM roycroft: it's confusing
10:20 AM roycroft: it's supposedly open with a limit on the number of people and a masking requirement
10:20 AM roycroft: but there are also a bunch of time restrictions that seem to change
10:20 AM roycroft: so i think the answer is "sort of"
10:24 AM roycroft: the other issue, and one of the main reasons i dropped my membership, is that every time i went there a major piece of equipmentbb was in some state of disassembly
10:24 AM roycroft: it seems that the "core members" like to tinker with machines that are working perfectly well
10:25 AM roycroft: one never knew what one would find when showing up
10:25 AM roycroft: and their webcams have been down for a long time, so i can't even check out what appears to be working and what is in pieces until showing up
10:53 AM * JT-Shop is automating a spoke lathe most likely made before WWI
11:38 AM JT-Shop: wow Messicks got back to me fast about the missing parts in the rebuild kits
11:45 AM roycroft: i think i'll have my drum sander working again today
11:46 AM roycroft: delta get the prize for the worst lift design mechanism ever made
11:47 AM roycroft: and sadly, part of the problem is that the belt for the lift mechanism is old and worn
11:47 AM roycroft: i'm going to have to replace it
11:48 AM roycroft: and that is going to mean unmounting and disassembling the machine again
02:09 PM t4nk_freenode: so I made this box out of thin mdf, to house some atx power supplies.. Is there some kind of trick or method to get the holes for the fans, power cable etc transfered to the mdf? since it's from the inside it's gonna be harder
02:09 PM t4nk_freenode: how would you tackle this?
02:12 PM JT-Shop: do it from the outside with a template
02:16 PM t4nk_freenode: tape a piece of paper onto the atx and then trace some holes you mean?
02:19 PM JT-Shop: yea
02:22 PM t4nk_freenode: I'll try to force sth, after dinner
02:22 PM t4nk_freenode: getting sick and tired of them there wires on those power supplies
02:23 PM t4nk_freenode: and my box keeps falling apart under my nose too... can't fix it into place until I got the holes cut
03:13 PM Deejay: gn8
03:34 PM Tom_L: t4nk_freenode, atx psu dimensions are readily available online. just measure the hole locations
04:13 PM * JT-Shop ponders how to make a hinge that is easy to machine???
04:15 PM Tom_L: how big?
04:18 PM Tom_L: https://www.kipp.com/gb/en/Products/Operating-parts-standard-elements/Hinges/Block-hinges-with-fastening-nuts.html
04:19 PM Tom_L: https://www.kipp.com/gb/en/Products/Operating-parts-standard-elements/Hinges/Block-hinges-with-fastening-nuts-long-version.html
04:26 PM JT-Shop: kind of a special thing that is spring loaded to keep the wood bit in place
04:27 PM JT-Shop: that looks simple enough, two blind holes and one through hole
04:31 PM * JT-Shop gets a sippi cup of dry red and starts drawing
04:31 PM Tom_L: https://www.jetpress.com/component-and-fastener-products/lift-off-machined-block-hinges
04:31 PM roycroft: all i have to do is mount the motor on my drum sander and then i can test it
04:32 PM roycroft: there should be just a we bit of tweaking the conveyor after that and it will be back in service
04:32 PM JT-Shop: one of those sanders with the drum that goes up and down?
04:32 PM roycroft: no
04:32 PM JT-Shop: oh a drum sander
04:32 PM roycroft: it's one of those with the drum that stays put and has a conveyor that goes up and down :)
04:33 PM JT-Shop: and you have it mounted to something?
04:33 PM roycroft: it's mounted on a stand i built for it
04:33 PM roycroft: it's the one i was working on months ago
04:33 PM roycroft: with the broken gear
04:33 PM roycroft: i got frustrated and put the project aside for a bit
04:33 PM roycroft: then i got started on my new workbench
04:33 PM roycroft: and, well, everything else got put on hold until that was done
04:34 PM roycroft: anyway, it should be working today
04:34 PM roycroft: so i might start work on the mill/drill
04:34 PM JT-Shop: http://www.powermatic.com/us/en/p/pm2244-drum-sander-1-3-4hp-115v/1792244
04:34 PM roycroft: i need to take the head off and find out why the spindle is noisy and wobbly
04:34 PM JT-Shop: I'm considering that one
04:34 PM roycroft: mine is an open ended one too
04:34 PM roycroft: i'd rather not have it, but it's what i have
04:34 PM roycroft: i got it for a song
04:35 PM JT-Shop: nice
04:35 PM roycroft: my primary use will be to make a whole lot of thin strips that are very precise in thickness
04:35 PM roycroft: if i were buying a new one, i'd get a smaller one that is supported on both sides of the drum
04:35 PM roycroft: but that's $1k
04:35 PM roycroft: and i have this
04:36 PM JT-Shop: like which one?
04:36 PM roycroft: there's a small grizzly
04:36 PM roycroft: one sec
04:36 PM roycroft: https://www.grizzly.com/products/Grizzly-12-1-1-2-HP-Baby-Drum-Sander/G0459
04:36 PM roycroft: that's one that i was looking at
04:37 PM roycroft: i'll be making hundreds and hundreds of strips of wood that will be 12mm x 2mm or 3mm
04:37 PM JT-Shop: the powermatic drum has bearings on both ends
04:37 PM roycroft: they need to be very smooth and very precise
04:37 PM roycroft: the one i have (delta) has bearings on both ends of the drum
04:37 PM roycroft: but one end is open
04:38 PM roycroft: it seems fairly rigid
04:38 PM roycroft: but the conveyor is very very fiddly
04:38 PM roycroft: https://www.finewoodworking.com/2000/12/01/cantilevered-drum-sander-31-250-review
04:38 PM roycroft: that's what i have
04:38 PM roycroft: and the conveyor issue is the same with all of the open ended ones
04:39 PM roycroft: but since the setting will rarely change by more than 1/16th of a turn of the crank, once i get it dialed in it should be ok
04:41 PM roycroft: if you're going to buy one, especially new, and ESPECIALLY if it's a new powermatic ($$$), try to find one you can use first
04:41 PM JT-Shop: that might be impossible around here
04:41 PM roycroft: the open end design seems great because you can sand parts 2x as wide as the drum, but it's really not fun to work with them
04:42 PM roycroft: also, i hope you're not intending to use the drum sander ot thickness parts
04:42 PM roycroft: because all that will happen is you'll burn them and you'll get frustrated and impatient
04:42 PM roycroft: they're really just for final sanding
04:42 PM JT-Shop: http://www.powermatic.com/us/en/p/60hh-8-jointer-2hp-1ph-230v-helical-head/1610086K
04:42 PM roycroft: which is why i'll be using mine to thickness parts ;)
04:42 PM JT-Shop: I have that jointer and really like it a lot
04:42 PM roycroft: but my parts will be so tiny it will actually work for that
04:43 PM JT-Shop: I have a 15" Jet planer that I put a digital readout on
04:43 PM roycroft: nice
04:43 PM roycroft: i have a 15" grizzly with a helical head and a dro
04:43 PM roycroft: i love it
04:43 PM roycroft: and the dro was an *awesome* addition
04:43 PM JT-Shop: got that for a song with a dust collector
04:43 PM roycroft: no more dialing in and guessing
04:44 PM JT-Shop: yeah before the dro much fiddling around
04:44 PM roycroft: i just take a caliper to a piece of wood
04:44 PM roycroft: 0.874 inches
04:44 PM roycroft: turn on the dro, dial it down to 0.850" or so
04:44 PM roycroft: and take the first pass, knowing it will be fine
04:44 PM JT-Shop: mine can measure the thickness of a part too
04:44 PM roycroft: wixey?
04:44 PM JT-Shop: yea
04:44 PM roycroft: that's what i have
04:45 PM roycroft: on the thicknesser, and also on my router table
04:45 PM roycroft: i'm thinking of getting one for the drum sander as well
04:45 PM JT-Shop: it was a bit of a challenge to mount it to the Jet
04:45 PM roycroft: i've been holding off until i got the sander working again
04:46 PM JT-Shop: back to work for me
06:12 PM MrHindsight: https://www.grainger.com/product/29PA26?gclid=EAIaIQobChMItaH-0Zaw7AIVCL7ACh388QGDEAQYBiABEgLfOfD_BwE&cm_mmc=PPC:+Google+PLA&ef_id=EAIaIQobChMItaH-0Zaw7AIVCL7ACh388QGDEAQYBiABEgLfOfD_BwE:G:s&s_kwcid=AL!2966!3!264955915895!!!g!439505055028!&gucid=N:N:PS:Paid:GGL:CSM-2295:4P7A1P:20501231
06:12 PM MrHindsight is now known as CaptHindsight
06:13 PM CaptHindsight: Tom_L: thanks for reminding me, I need to source or make these for lower cost
06:14 PM CaptHindsight: http://www.minitecframing.com/Products/Hinges_Links/Hinges_Links_T-Slotted_Profiles.html all at silly high prices
06:15 PM Tom_L: unless you're gonna make a bunch i doubt you can beat the price for one offs if you count cad, setup, machine, operator time
06:15 PM CaptHindsight: a bunch
06:16 PM Tom_L: those are probably extruded too
06:16 PM CaptHindsight: http://tslotfasteners.com/dir/index.php?cPath=26_36_39 <$7 ea
06:17 PM CaptHindsight: vs $40 per door
06:18 PM Tom_L: well we _are_ talking grainger
06:18 PM CaptHindsight: 80/20
06:18 PM CaptHindsight: all the hardware is where they get you
06:19 PM Tom_L: just like printers. they give them away and sell you the ink
06:19 PM CaptHindsight: yes, similar
06:19 PM CaptHindsight: i delivered a machine a week ago without the doors
06:19 PM CaptHindsight: they haven't asked for them :)
06:20 PM CaptHindsight: https://www.jwwinco.com/en-us/products/3.3-Hinging-latching-locking-of-doors-and-covers
06:21 PM CaptHindsight: crazy prices for these at McMaster or Grainger
06:21 PM CaptHindsight: too high even for guberment contracts :)
06:30 PM skunkworks: http://electronicsam.com/images/greenmachine/Screenshot_2020-10-12_18-24-22.png
06:30 PM infornography: it's a butt with a point at the bottom
06:34 PM CaptHindsight: skunkworks: whatcha werkinon?
06:35 PM Tom_L: his comp will read in a file now
06:37 PM CaptHindsight: ~$3 per 10 PACK vs ea http://tslotfasteners.com/dir/index.php?cPath=1_4
06:39 PM roycroft: note to self: pencil lines are not very thick
06:40 PM roycroft: i spent 20 or so minutes trying to level the conveyor bed on my drum sander
06:40 PM roycroft: i'd run a piece of mdf through it, making sure the whole surface was sanded
06:40 PM infornography: I took some small carriage bolts and ground two sides off to fit in the little T-slots
06:40 PM roycroft: then i'd draw horizontal lines across the mdf, turn it around 180 degrees, and run it back through after raising the bed a tiny bit
06:41 PM roycroft: i could never quite get rid of the entire pencil line doing that
06:41 PM roycroft: finally, i ran it through in the same direction three times
06:41 PM roycroft: and pulled out some calipers
06:41 PM roycroft: the left side was 0.5590" thick on the front and the back
06:41 PM roycroft: the right side, which would not remove the pencil line, was 0.5595" thick on the front and the back
06:41 PM CaptHindsight: infornography: don't laugh, the made to fits are just 10X the price
06:42 PM roycroft: i can live with five tenths :)
06:43 PM roycroft: especially since it's five tenths over 18", and the average part i need to thickness with it is 1/2" wide
06:43 PM * roycroft calls that done and starts work on the mill head
06:44 PM roycroft: i hope it's just a bad spindle bearing that's the problem with the mill head
06:44 PM CaptHindsight: how do you sleep at night? :)
06:44 PM roycroft: since late 2016, not well :(
06:46 PM CaptHindsight: with all the worlds information available at your fingertips
06:46 PM CaptHindsight: this is where we are
06:47 PM CaptHindsight: clip from 1960 https://youtu.be/FEBcOYTrpi0?t=158
06:48 PM CaptHindsight: from a book written in 1895 :(
06:49 PM roycroft: all the world's fake information is also available at one's fingertips
06:49 PM roycroft: and we do not train children to discern between real and fake information any more
06:49 PM roycroft: this is the problem
06:49 PM roycroft: and the book was the best
06:49 PM CaptHindsight: some call it a feature
06:49 PM roycroft: but the original film was 100x better than the remake
06:49 PM CaptHindsight: oh yeah
06:50 PM roycroft: maybe 1000x better
06:50 PM roycroft: there's never been a time machine like that one
06:50 PM roycroft: because it's the epitome of what an 1895 time machine would look like
06:51 PM roycroft: speaking of time
06:51 PM roycroft: it's time to go disassemble the mill head
06:52 PM roycroft: and try not to get too messy in the process
06:52 PM CaptHindsight: off with its head!
06:54 PM roycroft: years and years ago (like in the early '80s) i had a girlfriend whose family lived on the olympic peninsula in washington state
06:54 PM roycroft: they were all loggers
06:54 PM roycroft: we went to visit her sister at christmas time
06:54 PM roycroft: i met the sister
06:54 PM roycroft: she was really nice
06:54 PM roycroft: i sat down on the sofa, while my gf and her sister were doing stuff
06:54 PM roycroft: and to pass the time i started reading the newspaper
06:54 PM roycroft: her husband came home
06:55 PM roycroft: i was introduced to him
06:55 PM roycroft: he looked at me and exclaimed "you read!?"
06:55 PM roycroft: i said "yeah, i'm just reading the paper"
06:55 PM roycroft: and he replied "i don't know if i've ever met anyone who reads when they don't have to"
06:55 PM roycroft: i knew then that i was in a different world
06:56 PM CaptHindsight: sounds familiar
06:56 PM roycroft: so this is not a new problem
06:56 PM roycroft: it's just more widespread than it used to be
06:56 PM CaptHindsight: why most are here are stuck in Jr High mentally and emotionally
06:56 PM CaptHindsight: readin, writin, numberin
06:58 PM CaptHindsight: https://www.youtube.com/watch?v=1MWq6L19eNo
08:58 PM roycroft: so far the spindle seems fairly tight, and nothing looks dry or damaged, although i have not completely disassembled it yet
09:23 PM CaptHindsight: i haven't looked at 2.8 closely to see how 2 motors on one axis are handled
09:24 PM CaptHindsight: Can this be easily expanded to support 4 motors on one axis?
09:30 PM Tom_L: It is permitted to write an axis name twice (e.g., X Y Y Z for a gantry machine)
09:30 PM Tom_L: http://linuxcnc.org/docs/2.8/html/config/ini-config.html#_axis__lt_letter_gt_section
09:30 PM Tom_L: 2/3 down
09:30 PM Tom_L: [TRAJ]
09:31 PM Tom_L: also [AXIS] and [JOINT]
09:32 PM CaptHindsight: comparing 2000Kg vertical lift designs 1 x 1 x 1m
09:32 PM CaptHindsight: scissor vs 4 screws, 1 screw per corner
09:37 PM CaptHindsight: 1 big screw vs 4 smaller screws
10:36 PM CaptHindsight: wow, NIST still uses Labview vs LCNC to control printers
11:18 PM CaptHindsight: https://www.3dprintingmedia.network/wp-content/uploads/2019/06/298C9106-9869-44A0-A312-3B15D0079B30-1832x1374.jpeg 4 screws on the Z-axis
11:26 PM CaptHindsight: https://forum.linuxcnc.org/49-basic-configuration/38620-homing-procedure-for-axis-with-multiple-slaves#160750
11:36 PM diginet: would linuxcnc work for controlling a 3d printer?
11:38 PM diginet: also, does anyone here know anything about linear motors?
11:39 PM CaptHindsight: diginet: I use it for all types and yes I use linear motors
11:39 PM diginet: oh sweet
11:40 PM CaptHindsight: there are linear servos and linear steppers
11:40 PM diginet: what is the typical set up for a linear motor? linear motor + rail/carriage + linear encoder?
11:40 PM diginet: I'm def interested in servos
11:40 PM diginet: but the steppers seem cool too
11:41 PM CaptHindsight: the motors are just coils and magnets so you need a linear bearing as well
11:41 PM diginet: yeah
11:41 PM CaptHindsight: and the encoder for closed loop
11:41 PM diginet: right
11:41 PM diginet: do you know if the linear motors you occassionally see pop up on ebay are worth it?
11:41 PM CaptHindsight: so think of both like you unwrapped a rotary motor and laid it out flat
11:41 PM diginet: right exactly
11:42 PM CaptHindsight: you have to know how to drive them
11:42 PM CaptHindsight: and which forcer goes with which magnets
11:43 PM diginet: right
11:43 PM CaptHindsight: https://www.ebay.com/itm/Anorad-Linear-Servo-Motor-with-Magnet-Track-32-3-4/190563671091
11:43 PM CaptHindsight: just coil and magnet track but matching ^^
11:44 PM CaptHindsight: you need to know the motor specs or you will have a difficult time tuning as a beginner
11:45 PM diginet: is positioning repeatability on them good?
11:46 PM CaptHindsight: the best
11:47 PM CaptHindsight: the fastest and most accurate for small to medium loads
11:47 PM diginet: interesting
11:47 PM diginet: that was my hunch
11:47 PM CaptHindsight: easily sub micron repeatability, runout and wobble is based on the liner bearings
11:47 PM diginet: oh, very cool
11:48 PM CaptHindsight: https://www.youtube.com/watch?v=ifBPgVDvvK0
11:48 PM diginet: seems like it could be useful for another project of mine
11:48 PM CaptHindsight: speeds to several meters/sec
11:48 PM diginet: which is writing masks for DIY lithography
11:49 PM CaptHindsight: we use piezo types for that
11:49 PM CaptHindsight: sub micron positioning
11:49 PM CaptHindsight: or voice coil motors
11:49 PM CaptHindsight: depends on travel
11:50 PM CaptHindsight: https://www.youtube.com/watch?v=gD9rkh3zC6Q
11:50 PM diginet: oh interesting, do you work in the semi industry?
11:51 PM CaptHindsight: https://www.youtube.com/watch?v=i-Dm-5EfSAk
11:52 PM CaptHindsight: I also build lithography equipment, additive manufacturing equipment to sub micron
11:53 PM CaptHindsight: https://imgur.com/b4zPwKo last weeks project, DLP resin printer with XY down to 15um
11:53 PM diginet: very cool
11:53 PM CaptHindsight: with inverse microscope it can go down to 1um
11:54 PM CaptHindsight: https://imgur.com/LOriL1y 5 axis inkjet with all linear servos
11:54 PM CaptHindsight: https://imgur.com/gLwOHAg ^^
11:55 PM CaptHindsight: that one could hold a few microns of repeatability over ~250mm XYZ
11:55 PM diginet: cool!
11:56 PM CaptHindsight: https://www.jcnabity.com/
11:57 PM CaptHindsight: https://gmwgroup.harvard.edu/publications/microscope-projection-photolithography-rapid-prototyping-masters-micron-scale
11:58 PM diginet: cool paper