#robotics Logs

Aug 23 2014

01:43 rue_house hi
02:10 rue_shop2 dear god these overpriced servos from hobbyking are terrible
02:10 rue_shop2 the first one, I think the feedback pot is backwards, it pins itself up against a stop
02:11 rue_shop2 the second one, with a stable control signal, chatters
02:11 rue_shop2 shall I try the other 8?
02:15 Hyratel1 do it and write a comprehensive scathing review
02:20 zero_coder hello, what is the difference ADXL335 and MMA7361 accelrometers?
02:33 rue_house !! sweet !! I got the mega328 servo controller working!
02:35 rue_house anyone want a 8 channel, 12 bit, serial servo controller for $3?
02:51 pythonsnake hey
02:51 pythonsnake what's the ideal size for pliers for electronics?
02:51 pythonsnake 150mm?
03:12 rue_house no
03:12 rue_house about 100
03:13 rue_house interseting, I dont think serial servo controllers are avialable for less than $20
03:32 Jak_o_Shadows Strictly speaking, I will want one at some point
03:32 rue_house I can find "some" on aliexpress for $14, but they are i2c and they aren't the 12 bit they advertize as
03:33 rue_house they also dont have the right duty
03:41 pythonsnake thanks
03:43 rue_house hmm from 1000 founds, to
03:44 rue_house 5000 counts
03:45 rue_house no
03:45 rue_house hu?
03:45 rue_house aha
03:46 rue_house 100 to 500 counts, so you only get less than 9 bits
03:46 rue_house http://www.aliexpress.com/item/F08019-16-Channel-12-bit-PWM-Servo-Shield-Driver-I2C-Interface-for-Robot-Free-shipping/1798212037.html
03:46 rue_house ^^ actually its less than 9 bits of position control for the servo
03:46 rue_house on mine you get about 12 bits
03:46 rue_house actaul valid position
03:49 rue_house 0-12000
03:51 rue_bed and mine is real serial
08:45 Tom_itx http://www.electronicproducts.com/Videos/Salmon_cannon_shoots_fish_over_hydroelectric_dams.aspx
08:45 Tom_itx http://www.electronicproducts.com/Videos/Mesmerizing_and_a_little_scary_Watch_a_swarm_of_1_000_robots_shuffle_into_formation_on_command.aspx
10:33 GuShH Tom_itx: how tall is the sherline mill?
10:34 GuShH a friend wants to know, he lives in an apartment
10:34 GuShH told him instead of spending the money on a silly 3d printer he should get some nicer tools instead
10:35 m_itx whips it out to c
10:35 Tom_itx ~22" or so
10:36 Tom_itx i'd get one made from iron if i were gonna do it over
10:36 Tom_itx but i've still done quite a bit with mine
11:02 rue_house Tom_itx, is yours alum?
11:04 Tom_itx most of it is
11:04 Tom_itx the z slide is steel
11:04 rue_house huh
11:04 rue_house cast aluminum.....
11:04 Tom_itx probably machined from block
11:04 rue_house each peice being, say, less than 6L of aluminum?
11:05 Tom_itx 6L ?
11:05 Tom_itx by far
11:05 rue_house :)
11:05 rue_house hmmmm
11:06 e_house bumps up the priority of making a larger cope and
11:06 Tom_itx you should come visit the scrap yard and you'd never have to cast anything again
11:06 rue_house scrap yard here are one way
11:06 Tom_itx they seriously have scrap in the 2-3' diameter dimensions
11:07 rue_house the only time I can get something is from the dropoff bin when they are closed
11:07 Tom_itx lucky for me we build airplanes here
11:07 rue_house yea
11:07 rue_house I think I just invented a cartioflourogram
11:08 rue_house such amazing things happen in the shower
11:10 Tom_itx tmi...
11:10 rue_house ?
11:20 fluffywolf I like my Sherline... except it's too small.
11:21 fluffywolf the 3" of Y travel is the worst. I should get a Y extension kit, but they're all $$$$, and hurt rigidity.
11:24 Tom_itx i get a bout 7 x 9
11:24 fluffywolf you must have the big multi-direction one
11:25 Tom_itx yup
11:25 fluffywolf which has a lot more room, but even worse rigidity, and about ten things to square up. :P
11:25 Tom_itx yup
11:26 fluffywolf I just got a new toy... having a hard time finding the sprockets I need to CNC it. going to have to order from china and/or fab, it seems.
11:27 fluffywolf I need HTD 5M (5mm pitch metric timing belt), 40 tooth, 15mm belt width, 12mm bore with set screw. despite every one of those numbers being standard, I can't find it.
11:28 fluffywolf there's shops in china that say they'll make anything if you order 10pcs, but then I have 10 of them when I need 3...
11:28 Tom_itx that's what ebay is for
11:28 fluffywolf tried ebay. no luck.
11:28 Tom_itx sell what you don't need
11:29 fluffywolf the machine came with XL pulleys, but the motors I got have 14mm keyed shafts... and apparantly 14mm keyed XL pulleys are non-existant.
11:30 fluffywolf the motors I got came with HTD pulleys, and HTD is better anyways...
11:30 fluffywolf the motors I got are actually completely overkill, and can probably rip the brass nuts right out of the saddle... heh
11:34 fluffywolf this machine has a different problem... it has nice big X and Y (I think it's 20x12 or something like that), but only 3" of Z!
11:39 rue_shop2 AWESOME!
11:39 rue_shop2 the futaba servos I ordered from china that were half the price of the hobbyking ones WORK PROPERLY and dont jitter
11:40 rue_shop2 $7.50ea (duties included) = dosn't work + jitter
11:40 rue_shop2 $3.30ea (no unexpected shipping fees) = works, no jitter
11:40 fluffywolf http://www.ebay.com/itm/5M40T-P-5MM-Teeth-40-Bore-8MM-Stepper-motor-Arc-Timing-Belt-Pulley-Synchroniza-/321218583078 I'm tempted to get three of those, chuck them on the lathe, and bore the center from 8mm out to 12mm.
11:41 rue_shop2 yup
11:41 fluffywolf which involves buying more lathe tooling...
11:42 Tom_itx just make sure there's enough meat left so the setscrew doesn't strip out
11:43 fluffywolf looks like it
11:49 fluffywolf bbl, time for yard sales
11:50 fluffywolf http://www.beltingonline.com/40-tooth-htd5-pulley-40-5m-15f-7785 they'll custom make one for a reasonable price, and shipping from the UK is much faster than china, albeit much more expensive...
11:51 fluffywolf not much more than those chinese ones, and they'll come ready to use, rather than needing turning.
11:51 fluffywolf but, for now, bbl.
11:55 fluffywolf ouch. cheapest shipping they offer is 30gpb. fuck that.
11:55 fluffywolf bbl
11:55 fluffywolf gbp
11:55 rue_shop2 did you check aliexpress?
11:58 fluffywolf yep
12:08 rue_shop2 huh
12:09 rue_shop2 know a local 3d printer?
12:13 GuShH Tom_itx: errr he doesn't have space for anything bigger
12:14 GuShH sure the sherline fits on the table of my mill, but that had nothing to do with the question
12:14 Tom_itx taig is small too
12:14 Tom_itx steel i think
12:15 Tom_itx not sure
12:15 GuShH the x2 also fits on this machine
12:15 GuShH probably steel
12:15 GuShH there's so little material on those machines they're for very light duty, small work
12:15 GuShH he wants to make small parts so I pointed him toward that direction
12:16 GuShH (sure you can make small parts on a big machine, but that's besides the point :P)
12:16 GuShH apartments are tricky
12:16 GuShH you can't make a lot of noise, can't house big equipment
12:16 GuShH heck the smell of solvents or anything for that matter will upset the guy living next door
12:17 GuShH Tom_itx: is it morse taper 0 or 1? on the quill, to know if he's going to have issues finding tooling
12:18 GuShH or it's own taper?
12:21 GuShH the problem with this machine right now is that we don't quite know where to plug it http://gushh.net/tmp/dscn6134f.jpg
12:21 ShH chuc
12:26 Tom_itx 1
12:26 Tom_itx or 2 maybe
12:26 Tom_itx i forget
12:27 Tom_itx 2 i think
12:27 GuShH that sounds big for the size
12:27 GuShH maybe for convenience
12:28 GuShH I know their lathes tailstock are taper 0
12:28 GuShH which I've never seen or owned anything that small (it's non standard where I live)
12:28 GuShH but I do have MT1 drills
12:29 GuShH oh found a nice site
12:29 GuShH http://www.sherline.com/images/5400plan.jpg
12:29 GuShH http://www.sherline.com/images/5000plan.jpg
12:29 GuShH http://www.sherline.com/images/2000plan.jpg
12:29 GuShH odd one that 2000 series
12:30 GuShH says all spindles are MT1 and all headstocks are MT0
12:30 GuShH so MT1 is not that rare, it's workable
12:30 GuShH actually I've been sent the wrong arbors once, they were MT1 and I still haven't got sleeves for them
12:32 GuShH sadly he lives about 800KM from where I live, it's not like we can share tooling and he's almost in the middle of nowhere, so sourcing stuff is harder
12:43 GuShH that's a lot of useful info http://www.sherline.com/dimen.htm
12:43 GuShH says the tables are extruded and only the surfaces are machined
12:43 GuShH must be for the aluminum ones
12:44 GuShH makes sense, cost wise, with your own die it's cheaper than using solid blocks
16:18 rue_shop2 well, less a weighted base, arm8 is finished
16:19 rue_shop2 the little arduino board is working
16:20 Tom_itx the little board that could?
16:20 rue_shop2 yea, I'm wondering if I can sell them on ebay
16:20 Tom_itx i dunno, your rock didn't do so good...
16:20 rue_shop2 the serial servo controllers go from $14 to 55 really quick, then up
16:21 rue_shop2 that wasn't just any rock, that was a genuine canadian rock
16:21 rue_shop2 people just aren't into the real deal these days
16:22 rue_shop2 huh, ya know
16:22 rue_shop2 the random junk I'm buying from china has been working its way into all my projects
16:22 rue_shop2 in a big way
16:30 deshipu I just found some aduino pro minis for $2 a piece :)
16:30 deshipu sure, if I made my own board, it would be cheaper
17:15 mumptai how to describe a robot behavior without using finite state machines?
17:36 GargantuaSauce why?
17:41 mumptai to program it
17:45 GargantuaSauce why do you not want an FSM
17:45 GargantuaSauce that really is a pretty convenient notation that translates well to code
17:47 GargantuaSauce i dont usually bother, instead opting to just crank out code
17:47 GargantuaSauce but if you want to do it "right" that is probably a very good first step
17:48 GargantuaSauce you could use a flowchart or whatever but those generally have pretty inconsistent semantics
17:53 theBear everyone wants a flying spaghetti monster !
18:08 fluffywolf what about a factory service manual?
19:19 Loshki I don't get it. Why do people seem to dislike FSMs so much. Either you're planning a robot which is so unpredictable an FSM doesn't apply (keep it away from me) or you're just too lazy to document its behavior up front...
19:20 fluffywolf I suspect most robots end up with something that could be described as a fsm, but is not designed nor coded as such.
19:20 fluffywolf just about everything can be described as a fsm, even if you have a rand() making state transitions. :P
19:24 fluffywolf unless you get into AI attempts, then who knows what. :P
19:30 GargantuaSauce well technically yeah you can represent the microcontroller itself running any arbitrary software as an fsm
19:30 GargantuaSauce it'd be a pretty complicated one though!
19:31 fluffywolf a robot with a whole bunch of variables, flags, image processing, etc, would also be unreasonable to try describing with a fsm.
19:32 GargantuaSauce well what you do is you break it up into components that are individually representable as simple ones, and you allow state transitions to occur as invoked by a separate fsm
19:40 robotustra evening
19:41 robotustra lazy vacations
19:51 fluffywolf it's not really useful for soldered splices, which don't tend to fail.
19:51 fluffywolf grr, wrong window
19:52 Loshki fluffywolf: "a robot with a whole bunch of variables, flags, image processing, etc, would also be unreasonable to try describing with a fsm" -- In that case, how would you describe the behavior of your robot? The code *is* the documentation?
19:52 fluffywolf documention? :P
19:52 fluffywolf grrr.
19:52 GargantuaSauce ^^^
19:52 fluffywolf documentation?
19:53 GargantuaSauce documentation is for chumps
19:53 uffywolf is typing and reading in too many places at once, increasing typo
19:54 Loshki fluffywolf: hello & welcome to hospital-mart. Today your prostate surgery will be performed by the excrucio-bot 2000. There are a few bugs in there, but there no documentation, so we can't fix it. Hic.
19:54 GargantuaSauce you spelled excision wrong!
19:55 Loshki Nah, it's one of those bugs I mentioned. It isn't painless...
19:57 uffywolf points to the Thera
19:58 mrdata giant, killer robot
19:59 mrdata whats happening these days with the X39 space plane?
20:01 mrdata http://futureplanes.blogspot.ca/2007/04/x39-x40a.html
20:02 GargantuaSauce hasnt gone anywhere afaik
20:02 mrdata the rumour i heard, is that it is a SSTO drone, capable of missions to ISS and elsewhere
20:02 GargantuaSauce nasa's morpheous lander is a good example of autonomous flight
20:03 fluffywolf my rocket experiment needs a multi-kW CO2 laser to build a small prototype.
20:04 Loshki You can always skid by without docs of any kind for tiny home projects, but it doesn't scale. That said, many developers loathe it and will do almost anything do avoid it, even to their professional detriment.
20:04 GargantuaSauce yeah software engineering is hard
20:04 GargantuaSauce and full of bullshit also
20:05 fluffywolf I try to comment non-obvious things in my code, but I've never written anything that would be described as stand-alone documentation. I've especially never used any software development process where the documentation is written first, gauranteeing the code is an ugly mess.
20:08 mrdata fluffywolf, a CO2 laser tube i looked at was rather large, and it was only around 60W
20:09 GargantuaSauce why not a plasma cutter?
20:10 fluffywolf I'm not planning on using it for cutting.
20:11 fluffywolf there's absolutely no reason I can see why a rocket needs to have all of its energy stored in the fuel. :)
20:11 GargantuaSauce i see
20:11 GargantuaSauce water propellant?
20:12 fluffywolf possibly, but it could also be a fuel, just made more efficient by adding energy
20:12 GargantuaSauce i imagine microwaves would be a better choice
20:13 Loshki We were *supposed* to do design, design-review, code, then code-review. The written docs for design review could be minimal, but you had to do a whiteboard presentation on the design to a room of your peers. If the code was for internal use by other groups, you would generally produce an API doc, possibly revising it as you coded, so that they could develop in parallel. If it was consumer facing, you'd have to sit with a tech-writer and explain it w
20:13 Loshki ell enough that they could document it, with review cycles. Meanwhile, it would be getting QA
20:13 fluffywolf air-breathing prototypes have been made that work just by superheating air... that gets you pretty far up essentially free.
20:13 Loshki QA'd and they need to know how to configure it...
20:14 GargantuaSauce what industry Loshki?
20:14 Loshki ...networking, routers, the early years, rhymes with Crisco...
20:15 GargantuaSauce cool
20:15 GargantuaSauce before they went to shit :V
20:15 fluffywolf ah, cisco... aren't they the people with hardcoded passwords and thousands of security holes that all passed design review? :P
20:15 Loshki The more docs you could write up front, the smaller that queue outside your veal-fattening pen...
20:16 Loshki I was once responsible for one of those holes. I patched an image that always let in a user, regardless of password, while testing something else. It never got past the automated tests in QA. Thank god..
20:17 GargantuaSauce and hardcoded credentials are very much par for the course
20:17 robotustra why I'm so lazy?
20:17 GargantuaSauce not enough caffeine
20:18 mrdata robotustra, idk
20:18 GargantuaSauce actually thats not true at all. caffeine when i'm lazy just makes me more energetically lazy
20:18 mrdata robotustra, have three reasons to do anything
20:19 robotustra I don't drink coffee
20:19 robotustra so it's not the reason
20:19 robotustra may be I became too fat
20:20 fluffywolf exercise?
20:21 robotustra too lazy, it's positive feedback
20:22 robotustra it's the time where will should do something
20:22 fluffywolf get a dominant girl/boyfriend who will get out a whip and/or cattle prod every time you slack off?
20:23 robotustra girlfriend? I have wife and 2 kids
20:24 robotustra so, I have no chance about yet another GF
20:24 fluffywolf and she lets you be lazy?
20:24 robotustra fluffywolf: yes
20:24 robotustra the understanding of lazyness is different
20:25 robotustra under lazyness I understand that all my hobby projects are not advancing :)
20:25 GargantuaSauce i think lethagy is really the word you're looking for
20:25 robotustra or advancing slowly
20:25 robotustra yeah, just lay down and sleep
20:26 fluffywolf speaking of lazy, I've spent too much time on irc. bbl, grabbing a snack then doing wiring.
20:26 robotustra heh
20:26 robotustra may be me too
20:26 robotustra it's like a drugs
20:27 robotustra I mean IRC
20:27 robotustra generally speaking internet is a drug also
20:27 robotustra we are all addicted
20:28 robotustra we abuse internet
20:28 robotustra and don't even realise that
20:32 mrdata i blame tumblr
21:12 RifRaf so, i've moved to the city :/
21:16 rue_house which one?
21:16 RifRaf brisbane
21:21 rue_house were we there?
21:21 rue_house isn't that north?
21:22 rue_house RifRaf, I have a ssc 8, that gives you 12000 real positioning counts
21:22 rue_house NO jitter
21:22 RifRaf yep north in new state
21:23 rue_house goes a bit shy of .5ms and a bit long of 2.5
21:23 RifRaf nice, no toys here for a while, cept a few pi's
21:23 uffywolf has lots of
21:23 rue_house following a new job?
21:23 GargantuaSauce theres a pretty decent hackerspace there isnt there
21:24 Tom_itx RifRaf, what brought you to brisbane
21:24 RifRaf GargantuaSauce, yep went there yesterday, looks like my new home
21:24 GargantuaSauce cool
21:24 RifRaf Tom_itx, applied for a job and got it
21:24 Tom_itx cool
21:24 Tom_itx if it's something you like doing...
21:24 RifRaf find out tomorrow if i did the right thing, first day
21:24 rue_house dj or electronics or?
21:25 RifRaf bigger cnc machines, will just be programming it, but is all new stuff, lots to learn
21:25 rue_house cooool
21:25 Tom_itx nice
21:25 Tom_itx what program do they use?
21:25 fluffywolf I need to make my new machine cnc...
21:26 rue_house I need to finish mine
21:26 RifRaf alphacam, autocad etc
21:26 Tom_itx not heard of alphacam
21:26 RifRaf nor have i :)
21:26 Tom_itx acad kinda sucks for cad cam
21:26 fluffywolf any suggestions for an open-source 3D cad program?
21:26 GargantuaSauce i like openscad
21:26 Tom_itx openscad sucks
21:26 RifRaf but been watching tutorials, is cad/cam but using it more for cam
21:26 GargantuaSauce it does but i still like it
21:27 fluffywolf openscad is buggy as hell, and lacks some simple commands that would make scripts much easier...
21:27 rue_house GargantuaSauce, are you also in australlia?
21:27 GargantuaSauce no we've been over this!
21:27 RifRaf heh
21:27 rue_house did you move again?
21:27 GargantuaSauce no
21:27 GargantuaSauce i am in PEI
21:27 GargantuaSauce have been all along
21:27 rue_house oh
21:27 rue_house you were in australlia, I remmeber
21:27 GargantuaSauce i have never visited that continent
21:28 rue_house sure sure
21:28 GargantuaSauce closest i've been is korea
21:28 GargantuaSauce which is still pretty far away!
21:28 rue_house other than RifRaf theBear and GargantuaSauce, who else is in australia?
21:28 GargantuaSauce i hate you
21:29 fluffywolf lol
21:29 rue_house oh I'm sorry, you moved to pei,
21:30 RifRaf fluffywolf, were you once furry?
21:30 Tom_itx some use cambam
21:30 Tom_itx there is another one...
21:30 rue_house I really want to write something
21:30 rue_house I have all the graphics libs, I'm just falling down on the gui
21:31 uffywolf is still fu
21:31 RifRaf yay, good to see you again :)
21:31 rue_house damn I have to go shopping still
21:32 RifRaf Tom_itx, have you had any exposure to biesse machines?
21:35 Tom_itx nope
21:35 Tom_itx what control?
21:36 Tom_itx those are wood working machines
21:36 RifRaf same, they look scary, control as in?
21:36 Tom_itx if big is scary...
21:36 Tom_itx it's still just cnc
21:37 RifRaf yep, just alot faster and stronger
21:37 RifRaf 13kw spindle
21:38 RifRaf they seem to be used alot for wood, but this one is for composites plastics and aluminium like the last one
21:38 Tom_itx more 'sheet' cutters
21:39 fluffywolf my new larger toy has two 3/4hp motors... a bit smaller than 13kw. lol
21:39 Tom_itx do they use vaccuum to hold the shet down?
21:39 RifRaf yep, autosensing vacuum though, alot more automated stuff
21:39 Tom_itx sheet
21:42 RifRaf fluffywolf, what does your new toy do
21:43 RifRaf Tom_itx, its 5 axis capable but hoping i only have to use 3 to start
21:43 fluffywolf RifRaf: it's a mill-lathe combo.
21:43 fluffywolf chinese
21:44 RifRaf cool, cnc or manual
21:44 fluffywolf http://fw.bushytails.net/shoptask02.jpg looks like that
21:44 fluffywolf it was CNC, then stripped... or else someone ordered CNC bits and never put it together.
21:45 RifRaf was tempted to get one of those when i got the lathe
21:45 fluffywolf it came with most of the pulleys and belts, but they don't fit the motors I bought.
21:45 RifRaf great, so you will converting it back eventually i guess
21:45 RifRaf am halfway though converting the lathe to cnc but is all put away for now
21:46 fluffywolf I bought motors and drivers, but am having a hard time finding the right combination of pulleys. metric is annoyingly hard to get.
21:46 fluffywolf I probably won't use any of the parts that came with it.
21:47 fluffywolf the other option would be to get motors that match the pullies it came with, but I spent $75 each on the motors I did get, because I couldn't find any old enough to have non-metric shafts.
21:48 fluffywolf old nema34 motors were apparantly 3/8" shaft... new ones are 14mm.
21:48 RifRaf yep mine are 14mm
21:48 GargantuaSauce metric pulleys are easy to get, they're just going to be 5mm ;)
21:48 fluffywolf the mill came with 3/8 bore pullies. heh.
21:48 fluffywolf GargantuaSauce: please find me a HTD 5M (5mm pitch), 40 tooth, 15mm belt width, 12mm bore pulley.
21:49 GargantuaSauce i mean 5mm bore
21:49 RifRaf tried spd-si?
21:49 fluffywolf yes
21:49 RifRaf aliexpress? alot of sellers of that stuff have items not listed for sale if you contact them
21:50 MrC123 Unknown message 'HO' The IRC server received a message it did not understand.
21:50 fluffywolf there's several sellers on aliexpress that say they'll make anything, if you don't mind ordering at least ten of them, a month to make them, and another month to get them here.
21:51 fluffywolf before CNCing it, I need to fix the x-axis leadscrew... the end of it where the pulley attaches is badly bent. the screw itself is straight, fortunately.
21:51 RifRaf yeah true, 1 off stuff may not be easy but i was able to get various pulleys instantly that were not listed
21:52 RifRaf i'll try find you the place i used
21:52 fluffywolf the machine was either dropped or hit with a forklift, breaking off the sheetmetal box that houses the lathe spindle pulleys and x-axis drive pulleys... the spindle quite handily won the battle vs the sheet metal, while the leadscrew didn't.
21:52 RifRaf so you got a good deal on it i guess?
21:53 fluffywolf it's got about a half inch of runout on the last 3" of shaft... my plan is to heat it up and bend it straight, or failing that, cut and sleeve a new piece on.
21:53 fluffywolf the end bearing stopped the bend
21:53 fluffywolf got it for $100
21:53 fluffywolf it's perfectly usable as a manual mill/lathe, and they were using it, just not cnc... I suspect it was cnc at the time, and it was stripped. (the belts and pulleys look used)
21:54 RifRaf very good deal :)
21:54 fluffywolf they sawzalled out a jagged hole in the sheet metal to let the end of the leadscrew wobble. :P
21:56 fluffywolf spd-si will sell me one with a 10mm bore for $25... I don't have any tooling capable of making that a 12mm bore... need to purchase a boring bar I guess.
21:57 fluffywolf I can get ones from china cheaply that have an 8mm bore
21:58 fluffywolf I'm also worried I'll run into belt length issues... x and z I can easily re-drill to change the motor spacing if I can't get a belt the perfectly length, but Y is a very shiny machined bracket that precisely hugs the motor.
21:59 RifRaf yep alot of chinese ones have a smaller bore, but can be resized on your lathe
22:00 fluffywolf it can be resized on _a_ lathe, not necessarily mine, until I buy other bits too. heh.
22:00 RifRaf heh
22:01 fluffywolf the motors I got are a tad bit overkill... 977oz-in, made in japan rather than china, 9A/phase...
22:02 fluffywolf got a set of 10A centent drivers, and I have some 28V 20A power supplies, which I'll use two of in series.
22:02 fluffywolf I predict I can break things.
22:02 RifRaf do they have to be geared down, maybe try fit directly, am not gearing down the nema23 on lathe, hopefully will be enough torque still, will try that first anyway
22:03 RifRaf but gonna gear down the nema34 for me router when i make it
22:03 fluffywolf the way the mill is built, there's no room for direct-drive... I could use equal-size pullies if I needed more speed, but I suspect these motors will spin fast enough to break things even geared down.
22:03 fluffywolf I was going to use 2:1.
22:04 fluffywolf how many oz-in are your motors?
22:04 RifRaf will try look em up, i think the nema34 ar 800oz
22:04 fluffywolf that's a good bit of torque, probably won't have any problems.
22:05 fluffywolf I had a hard time figuring out whether gearing down helps or hurts torque and/or speed... steppers have funky torque curves. gearing down hurts your torque at higher speeds
22:05 fluffywolf or any non-low speed
22:07 fluffywolf the torque falls off pretty quickly with speed, so by making the motor spin, say, twice as fast, it might have a lot less than half the torque, and end up with less torque even after the torque increase from the reduction.
22:08 RifRaf yep, should not be quite that bad though
22:09 fluffywolf obviously, at low speeds, a 2:1 reduction doubles your torque. but I've never lost steps at low speeds.
22:09 fluffywolf I always lose steps doing rapids or fast light cuts...
22:09 fluffywolf that's how I know it's time to strip my mill down, clean all the crap out that's stuck under the saddle, and oil everything. heh.
22:10 RifRaf i found alot of good info in this forum http://mechmate.com/forums/forumdisplay.php?s=ddc23cf25a2fe10e19ff3ef03b6c750c&f=26
22:10 RifRaf thats the router i am trying to make
22:10 fluffywolf I don't have room for toys that big. heh.
22:11 fluffywolf my new mill lives under a tarp in the driveway. :(
22:11 fluffywolf even if I could get it in the house, it'd go through the floor.
22:11 RifRaf but they go into detail regarding geared verses non geared and torque etc, sould be applicable still
22:11 fluffywolf ... wtf? the forum doesn't let you simply view threads without signing up?
22:12 RifRaf really?
22:12 RifRaf maybe thats why the info does not pop up in searches
22:12 fluffywolf what the fucking hell is wrong with forum admins trying to prevent the public from benefitting from knowledge shared on their forums? usually it's just not being able to view attachements or certain forums, but that's bad enough...
22:13 fluffywolf we have all this knowledge... let's keep it to ourselves!
22:13 GargantuaSauce what
22:14 GargantuaSauce 's stopping you from registering
22:14 fluffywolf the idea that I shouldn't need to?
22:15 fluffywolf think how useless the internet would be if you had to register for every single page you wanted to read, before you even knew if it was useful.
22:15 fluffywolf and how much spam you'd get.
22:17 Tom_itx maybe they don't want spammers joining their forums
22:17 Tom_itx it's a 2 way street there
22:17 RifRaf you won't get spam from that forum if that helps
22:21 fluffywolf Tom_itx: I don't see how that's relevant.
22:22 fluffywolf allowing people to view information doesn't result in spam.
22:42 Tom_itx yeah i suppose you could view without being able to post
22:53 Loshki All the other boards seem to manage. I smell a control freak...
22:55 GargantuaSauce it was probably a reaction to a specific incident of some sort
22:58 fluffywolf I can see why some admins set off-topic breeze-shooting forums to only be visible to members, but setting main help forums that way seems harmful...
23:04 rue_house I hate pointless registries
23:05 rue_house I'm also a bit nerved by ebay and aliexpress sending me add emails for things I'v done searches on
23:06 rue_house "still looking for coil transformers?" ....
23:09 GargantuaSauce ive never gotten stuff like that. must have been paying enough attention to opt out
23:14 rue_shop2 I was haivn a problem finding cheap CT transformers, I was playing with wording
23:14 rue_shop2 as chinese seem to sometimes lock on to silly wordage for a product
23:14 GargantuaSauce they sure do
23:15 fluffywolf yep
23:15 rue_shop2 I think the word "hot" can be found in 90% of listings
23:15 GargantuaSauce designer :)
23:15 fluffywolf sometimes silly, sometimes blatantly wrong and misleading... sometimes accidental!
23:16 rue_shop2 I think they like to use words in their listings that are used in things that sell well
23:16 GargantuaSauce yeah it is 100% salesmanship+engrish
23:16 GargantuaSauce an interesting combination
23:16 rue_shop2 hot led ice!
23:17 rue_shop2 oh hum
23:17 rue_shop2 I have this new robot arm sitting here waiting for instructions
23:17 rue_shop2 got the rest of the wries on, it looks good
23:17 GargantuaSauce it still is sorely lacking a dildo end effector
23:18 GargantuaSauce http://a.pomf.se/kecnhj.webm
23:18 rue_shop2 I suspect I dont want to click this link?
23:18 GargantuaSauce i am certain you do
23:18 GargantuaSauce it's actually an interesting design
23:19 rue_shop2 today I was relooking at the AOP605
23:19 fluffywolf I have lots of dildos, but none of them are attached to robots.
23:20 rue_shop2 I think I want to combine it with the pwm driver chips I got, make a 8x motor driver board
23:20 GargantuaSauce that is clearly a sign you need to rethink your life
23:20 uffywolf prefers women to ro
23:20 rue_shop2 oh I am so no comment
23:20 rue_shop2 I think I should go make supper
23:21 rue_shop2 and try to finish my bench power supply before someone on hackaday does something bad to me
23:22 GargantuaSauce Meet the GPIO2 IC (can be used to test sensitivity)
23:22 GargantuaSauce thanks china
23:22 rue_house hmm
23:23 rue_house garden fresh potatoes, should I make baked potato or hashbrowns
23:23 GargantuaSauce scalloped potatoes
23:23 rue_house thats not an option I have
23:23 GargantuaSauce you are a disappointment to us all
23:24 rue_house whatever
23:24 rue_house I'll get you with my army of small robotic arms
23:24 Loshki if the oven's on anyway, bake them...
23:24 rue_house I have 3 now
23:24 fluffywolf do they have dildos?
23:26 fluffywolf that sounds like a bad japanese porno.
23:34 mrdata rue_house, if they are fresh, roast them in the skins after scrubbing off surface dirt
23:34 mrdata i just pile them into the toaster oven, naked
23:34 mrdata and pierce them with a fork, so they dont explode
23:35 GargantuaSauce brush with olive oil + rosemary
23:36 mrdata nah i drizzle olive oil when i serve them
23:36 mrdata if you want rosemary, you'll need to wrap them
23:36 mrdata so i dont bother
23:40 theBear hmmm, a wolf i see...and these days you do have to register for 9 outta 10 things worth seeing in webland, and even worse 7 outta those 10 are probably forums, the very epitamy (sp?) of not only redundancy thru lazy idiots causing repetition, but also of the blind leading the blind, usually into the path of oncoming traffic :(
23:41 rue_house project list, lets see
23:41 theBear on that note, if anyone ever needs a shortterm legitimate email address, something like someguy@eff.registration.rememberit.blah, they should probly talk to me, 'cos you know, i'm the man
23:42 GargantuaSauce i just have a catchall on a whole domain
23:42 fluffywolf I just add an entry to /etc/alises.
23:42 GargantuaSauce lets me know exactly who shares my email :)
23:42 fluffywolf aliases
23:43 rue_house vacuum former, next step is to install the element in the heater box
23:43 rue_house cnc machine, next step is to assemble the control for the Y axis, make sure the dc servoloop works
23:43 rue_house 3d printer, next step is to point-to-point the motor driver board
23:44 theBear rue_house, what's that you say while i walk back to the couch ? convince self life is worth sustaining, fix any stupid fones or laptops i can track down privately and do world class work, in exchange for food and maybe a few beers? oh, that wasn't a poke, you were actually looking at your project list <grin> either way i gotta go back to the couch... turns out surgical wounds are not only painful, and increasingly itchy, but not real fond of most bo
23:44 theBear dy positions
23:44 rue_house bench power supply, needs the dc-dc designed
23:45 rue_house theBear, what did they presume to repair! ?
23:45 fluffywolf I have about a million projects, and a shortage of time, money, and energy.
23:45 GargantuaSauce yeah my list is getting pretty long
23:46 mrdata how about focusing on one project?
23:46 rue_house I want to put a brake solinoid on the drillpress too
23:46 GargantuaSauce have the money but no time or energy
23:46 mrdata rank all your projects by time / cost
23:46 rue_house all my projects cost $20 and take forever
23:46 mrdata er
23:46 rue_house for that matter
23:46 mrdata importance over cost, that is
23:46 rue_house the 12' mecca needs an elbow/knee design
23:47 GargantuaSauce rue_house: i have started thinking about direct-drive brushless motors for that sort of thing
23:47 GargantuaSauce like, big ones.
23:47 rue_house the mecca is all pneumatics
23:48 rue_house but I dont have an alg for operating complimentrary actuators yet
23:48 fluffywolf the new septic system is taking way more manual labor than I can reliably provide... I got the last big willow stump dug up a couple days ago, still have a few smaller ones... the cnc mill needs pullies and a leadscrew fixed... need to replace the breaker panel... need to build the new wiring harness for my other car... need to make enough money to pay my tax bill due in three weeks... need a new laptop... need new electrolyte for m
23:48 fluffywolf new batteries and the fun job of mixing and exchanging it...
23:48 rue_house the complience results in the ability to varry posiiton and damping (aka tension)
23:49 rue_house the new septic system I put in cost $26000
23:49 rue_house er 27k acutally
23:50 fluffywolf yeah, I don't have $26k.
23:50 fluffywolf I have about $0.26k right now.
23:50 rue_house I'm saving for a new house, it was part of the plan
23:51 fluffywolf and I have to write the IRS a $1600 check in three weeks.
23:52 rue_house damn, I forgot to do my taxes again
23:52 rue_house if I owe anything they are gonna own me by now
23:53 rue_house damn I'm falling asleep
23:53 rue_house tea, I need tea
23:53 fluffywolf or you need sleep.
23:56 rue_house no, no, drugs, I just need more drugs
23:56 rue_house TEA ME!
23:57 rue_house so I have serial servo controller code taht works on $2.50 arduio baords
23:57 StructuredArray cool
23:57 rue_house 12000 counts/180degrees, 8 servos, 100% glitch free
23:58 rue_house the mowerbot
23:58 rue_house it needs its caster fixed up
23:58 rue_house need to work on modulating data over an IR link
23:59 rue_house ok, I made a good ramp genorator for the powr supply pwm
23:59 rue_house but then the mode came into question
23:59 StructuredArray 14 bits