#robotics Logs

Dec 08 2014

00:34 RifRaf rue_more, thinking about your multicolour for lights, as the clear is not optically clear with printed it would be better to leave a 3mm tunnel in the part where you could poke a bit of raw clear filament into after printing, this would transmit the light well
00:36 rue_shop3 arg, I was prying up the circle with my thumb nail and learned how it got cut
00:36 RifRaf could make a cool single led decoration with several points for the light to come out of, need a tiny led/battery combo, have seen em with changing colours also, then we don't need to put in batteries and stuff, just some cheap module
00:36 rue_shop3 yea
00:37 rue_shop3 or just make a base with lights
00:37 rue_shop3 use a magnetic switch so that when you put soemting down on the base the light turns on
00:37 rue_shop3 eh?
00:39 RifRaf yep
00:51 RifRaf pretty cool small lights http://www.aliexpress.com/item/One-Pair-Light-LED-Blinking-Studs-Earrings-Accessories-for-Party-Festival-1PMPJ153/1986271700.html
08:28 rue_bed 5785
09:42 rue_more off to work
14:21 armyofevilrobots rue_shop3: rue_more: I think we should collaborate on http://www.thingiverse.com/thing:380987
14:21 armyofevilrobots Filament is %^@!# expensive.
14:22 armyofevilrobots and also http://www.adafruit.com/blog/2014/08/21/diy-3d-filament-ekocycle-transforming-3d-printing-using-recycled-plastic-bottles-3dthursday-3dprinting/ (which is marketing crap, but the concept is valid).
16:20 GuShH rue_more: remember that pneumatic gripper? I think I know why they needed it
16:21 GuShH they would hold the plumb bob blanks through a threaded stud and a special collet, to remove them you had to grip the part and turn the engine in reverse.... so that explains it, the gripper and the reverse was automated to remove the part on it's own
17:16 Tom_itx GuShH are you gonna start making plum bobs?
17:20 GuShH no
17:20 ShH slaps Tom
17:21 GuShH that was just the purpose of that gripper...
17:21 GuShH don't you like figuring things out?
17:22 GuShH now you need to help me figure out a USE for the gripper.
17:23 GuShH the amount of work that went into that thing is nuts, considering what it did
17:42 upid watches robot movie "Enthiran" , with English subtitles , fast-fwding thru the music sc
19:13 rue_more heh, the ramps 1.4 board arrived today
19:15 rue_more GuShH, cool
19:15 rue_more armyofevilrobots, .. yea!
19:15 rue_more I ahve a lathe!
19:16 rue_more armyofevilrobots, the video didn't say anything!?
19:17 rue_more armyofevilrobots, furethermore, I see a filament holder on the side
19:22 rue_more oh man thats a crude build
19:23 GuShH who are you talking to?
19:23 ShH checks his ignore
19:24 rue_more http://www.thingiverse.com/thing:380987
19:24 rue_more he dosn't show the ogger, but from the shank, it looks like a drill bit
19:24 GuShH there ought to be many youtube videos on that one
19:25 GuShH we worked out it wouldn't be cost effective to run one of these unless you had an inside person for the plastic pellets
19:25 GuShH because a) here nobody will sell raw materials to the public b) if they would, you would have to buy half a ton or more
19:26 rue_more but if you have a shredder you can make your own
19:26 GuShH heh, of course nearby I've got a company that works on ABS injection
19:26 GuShH rue_more: true, but factor in the time, cost of power and tooling, it may be a nice "recycling" setup but not cost effective
19:26 GuShH the most important aspect is making sure the filament remains within a certain tolerance, diameter wise
19:27 GuShH the dies will make it conform to a certain roundness, enough for this application, but there needs to be feedback for the diameter
19:29 GuShH I worked out a cheap, simple solution for the sensing of the diameter using an analog IR sensor, you make the filament go through a black box where the sensor is and given the amount of IR light detected, you can work out the diameter because the bigger it is, the less light you'll see. Of course I never figured out the actual resolution capability of this setup, you would need a nice ADC and some signal processing of course.
19:30 rue_more why not just pull it thru a die as it cools?
19:30 GuShH but it is possible to characterize this signal, generate a lookup table and use the feedback from the sensor to adjust the pulling rate
19:30 rue_more er just a sec
19:30 GuShH you mean cut it to size, because if it is too small you'll still be too small, plus it would give you a rough texture
19:31 GuShH remember at that stage it is still warm, so it behaves a bit like rubber
19:31 rue_more if you use a series of dies, you should be abel to get the size pretty tight
19:31 orlock GuShH: te place i bought my printer from has one
19:31 orlock proper commercial/industrial extruder
19:31 rue_more and use data tape/projector technology to control feed rates via a slak loop
19:31 GuShH rue_more: thing is at the output you may be at 3mm but if you pull, it becomes smaller
19:32 Tom_itx if you pull it you will stretch it
19:32 rue_more yea
19:32 orlock he mentioned humidity is a big issue
19:32 Tom_itx my first board is beyond repair
19:32 rue_more you extude it larger, and pull it smaller thru dies
19:32 Tom_itx no 3.3v no 1.2v
19:32 Tom_itx i can't solder those chips
19:32 Tom_itx i have them
19:32 rue_more oven?
19:32 rue_more fix the 3.3 and 1.2V first...
19:32 Tom_itx not gonna try that
19:33 orlock one of my little bearings went walkies, grrr
19:33 GuShH rue_more: wasteful, silly idea. the concept is to control the diameter while it's still warm
19:33 rue_more hmm
19:33 rue_more yea, it cools thru the dies...
19:33 GuShH this is how they do it commercially, either through cooling trays or just a basic feedback loop for the pulling force
19:33 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/rue/7I43.jpg
19:33 Tom_itx U6 & U10
19:33 Tom_itx they have a center pad
19:34 Tom_itx i can't unsolder that with what i have
19:34 rue_more oven or heat bed
19:34 GuShH orlock: they actually pull them through cooling fluid, but you shouldn't use water.
19:34 Tom_itx unleaded solder
19:34 GuShH if you do, you would need a series of drying steps, very costly.
19:34 GuShH otoh if you mean humidity at the entry point, yes it will cause steam bubbles = problem
19:34 GuShH that's why after shredding they go through a drying tunnel
19:35 GuShH which also picks up any magnetic shit in the way
19:35 GuShH as a secondary op, primarily the shredded material goes into water, metals fall, the plastic floats
19:35 orlock all i know is he buys the pellets
19:35 GuShH but we went back to recycling now
19:35 orlock and makes filament
19:35 GuShH yeah the companies making the pellets are doing what I described :p
19:36 GuShH usually either mix with virgin material + a certain % of recycled, or all recycled.
19:36 rue_more iirc the pelets are short cuts of extrusion
19:36 rue_more ?
19:36 GuShH and the dye if required
19:36 GuShH rue_more: it's a multi extruder head with a rotating cutter
19:36 Tom_itx maybe i can save the other board and use it as a spare
19:36 GuShH not within any specific tight tolerance
19:36 GuShH rue_more: so it works like a meat shredder with the same type of die
19:37 e_more
19:38 Tom_itx is the auger metal?
19:38 Tom_itx or plastic
19:38 GuShH most homemade ones use wood bits :p
19:38 GuShH for the auger
19:38 rue_more yea
19:38 GuShH problem is they're constant pitch
19:39 rue_more what do proper oggers do?
19:39 GuShH you want to decrease the pitch as you approach the die
19:39 rue_more ah
19:39 rue_more welder
19:39 Tom_itx yes because that will increase the force
19:39 GuShH so it helps compressing and pushing the material gaining torque
19:40 GuShH you could fab one with sheet metal and a welder.... or better yet, 4 axis milling machine :D
19:40 GuShH you need a relatively tight tolerance with the barrel/cylinder
19:40 rue_more my cnc cant do metal
19:40 GuShH I bet it could do aluminum with patience
19:40 rue_more tho, I can cast aluminum
19:41 GuShH make the former out of PVC
19:41 GuShH very easy to heat and twist into shape
19:41 GuShH just a thought
19:41 GuShH think PVC strips
19:41 rue_more are most pop bottles pet?
19:41 GuShH not sure if the newer ones are
19:41 GuShH those super thin green bs bottles
19:42 GuShH the ones you pick up and they almost flop about.
19:42 GuShH it feels crispier than pet, maybe still is pet
19:42 GuShH just their excuse to use less material, charge you the same amount or more.
19:42 GuShH wish there was an efficient method for pyrolisis
19:44 GuShH rue_more: a company here recycles bottle caps, sorts and shreds them, they're sold to a manufacturing company that makes a bunch of household items with the material, anyway most of the money goes to a local hospital / orphanage.
19:44 GuShH so people can donate the caps almost anywhere, they get collected, sorted, shredded and sold for a profit
19:45 GuShH I think that's quite nice, except for the price of the actual products... too expensive for what they are.
19:45 GuShH they make plastic trays, cups, wheelbarrows, etc.
19:46 GuShH going back to that filament extruder.... is his die a... hose barb?
19:46 GuShH and looking at the sensing, it seems to be the IR idea, unless he's got some other type of sensor maybe a camera
19:46 orlock http://bearingwholesalers.com.au/
19:46 GuShH at any rate you need a proper PID for the heat control to begin with
19:47 ShH heads to the SKF store when he needs a bearin
19:47 Jak_o_Shadows In australia, PET bottles are recycled, with some states/territories having a refund of about 10c per bottle
19:47 GuShH neat
19:47 orlock what is WITH south australia
19:47 GuShH we do have separate trash bins throughout the city, one is for bottles
19:48 Jak_o_Shadows ahaha, what's wrong with south australia?
19:48 GuShH I've seen a dude piss through the aluminum can hole in one of those bins.
19:48 orlock Jak_o_Shadows: Only place that gives the 10c
19:48 GuShH the hole is like 2 inches or whatever the size of an aluminum can is and it is NOT at crotch height.
19:48 Jak_o_Shadows ahaha. Silly other states and territories
19:49 orlock That place looks awesome, and is only 15 minutes drive away
19:49 orlock but - wholesale only it seems
19:49 GuShH if they have massive industrial taper bearings on display for you to play with while you wait... then it should be an awesome store
19:50 GuShH I need to order some big taper bearings... they're gonna cost.
19:52 GuShH :(
19:52 GuShH they should take your old bearings in for a tiny discount as scrap metal
19:52 GuShH right? right?
19:52 GuShH why not!
19:56 orlock GuShH: one of the places i was looking to buy bearings - http://www.richmondau.com/wheelmakers/
19:58 GuShH the place I go to has no website and yet is the biggest store in town, hilarious.
19:59 ace4016 those are some monster wheels orlock
20:00 GuShH nice polyurethane stuff
20:07 orlock hah, the bearing shop
20:07 orlock its next to Motec
20:08 orlock i didnt know they were located there
20:08 orlock Motec the company mentioned in the original Fast and the Furious
20:08 orlock "And a Motec systems exhaust!"
20:08 orlock .. they make ECUs.
20:09 orlock Motech
20:09 orlock Hmm. No, notthe same company.. Motec is in this state though, but looks like its just a car service place with a name that sounds the same
20:22 orlock found a coccoon - so now its got a motion sensing webcam pointed at it
20:42 orlock oh awesome
20:42 orlock theres another bearing shop between home and work too
20:46 Tom_itx all the more reason to spend your money before it gets home
20:50 rue_shop2 really windy, doing a run test on my genny
20:57 rue_shop3 zlog
21:08 rue_shop2 thats twice now the shop fileserver has fallen off the network
21:11 Tom_itx what did you do to it?
21:41 rue_shop2 its done it wtice in the last week
21:41 rue_shop2 I'm wondering if its ill
22:13 GuShH Tom_itx: rue_shop2: this is the part I had to make by guesswork http://imgur.com/a/CKHdW used a grinder to shape it (trial and error) until it began to cycle through, then it went through some hand filing to fine tune it.
22:13 GuShH next up, new springs and spring guides
22:14 GuShH wasn't quite trivial
22:14 Tom_itx well if it works...
22:15 GuShH without it there's no way the turret can work
22:15 GuShH not sure why it was removed
22:15 GuShH and I still couldn't find any information / pics on the part itself, not sure if the original looked like this
22:16 GuShH I'm also not sure it makes sense to machine a final part, if this works fine
22:16 GuShH a spacer might be useful so it keeps pushing against the side, or a small spring...
22:17 GuShH I bet the original was a bit wider and had two steps for the contact areas
22:20 GuShH hrmm interesting, that oil was brand new yesterday, today it looks rusty... must be pulling all kinds of crap from the tiny grooves
22:21 rue_shop3 nice work
22:22 GuShH wish I had a nice set of needle files
22:22 GuShH with all the fancy profiles
22:22 Tom_itx those are handy
22:22 GuShH the good ones are quite expensive, I let a whole set go :(
22:22 Tom_itx i've used mine quite a bit
22:22 GuShH it was about 100 bucks mind you, on files...
22:22 GuShH some used
22:23 GuShH can't justify that on files, files!
22:23 GuShH so I use what I have
22:23 Tom_itx mine weren't that much but work good
22:23 GuShH oh the lot was about 40 files or so, some were used but all good quality... I just couldn't afford it
22:23 GuShH plus the dull ones are pretty much useless
22:23 GuShH unless you turn them into scraping tools
22:24 ShH wishes his mill was actually assemble
22:24 Tom_itx well i wish mine worked
22:24 GuShH I need help to lift the parts... and I need good weather to finish painting them, first.
22:24 GuShH an engine crane would help
22:25 GuShH although they don't seem to go high enough
22:25 Tom_itx can't test the 2nd board but the first one is a gonner
22:25 GuShH what happened?
22:25 Tom_itx i can't swap those parts with my iron
22:25 Tom_itx and i'm not putting it in the toaster oven
22:25 GuShH this thing had a cam switch and a lightbulb socket... nothing else to it.
22:25 ShH g
22:25 Tom_itx first off, it's not set up for RoHs
22:26 GuShH rohs sucks
22:26 Tom_itx i got the parts swapped out on both boards all but the tiny ones
22:27 GuShH what happened to the boards?
22:27 Tom_itx i dunno if the daughter card is fixed or not but it's probably ok
22:27 Tom_itx no idea
22:27 ShH fr
22:27 Tom_itx blew out all the 5v
22:27 Tom_itx but the 5v reg is good
22:27 GuShH odd
22:27 GuShH I would replace the reg
22:27 GuShH and add some transient supression for kicks
22:28 GuShH so all of your cnc boards are goners? that sucks
22:29 Tom_itx 2
22:30 Tom_itx i hope the other one isn't hurt
22:30 Tom_itx i didn't check it but i didn't see any smoke from it
22:31 GuShH just design your own
22:31 GuShH no more worries
22:31 GuShH if I spent as much as the machine is worth on drivers and steppers, etc... and the drivers went poof... I'd be very upset
22:32 Tom_itx i like these boards though
22:32 orlock http://dark.crypt.net.au/EndStops/ Does anybody recognise those endstop mounts?
22:34 Tom_itx the plastic parts?
22:34 orlock yeah
22:35 GuShH Hmmm the spring pins keep getting loose and crushed on the handle of that machine, I bet the wear just made both holes over-sized...
22:35 GuShH maybe I should ream one size up
22:35 GuShH on bigger machinery I've seen one pin inside the other, or actual coiled spring pins.
22:36 GuShH (roll pins for ya'll)
22:36 Tom_itx http://www.thingiverse.com/thing:22880
22:37 Tom_itx http://www.thingiverse.com/thing:176125
22:37 orlock yeah, not them
22:37 orlock not that oe, but closer
22:37 orlock thats the closest one i found last night
22:37 orlock i ight just break out the polymorph
22:38 Tom_itx http://www.thingiverse.com/thing:124
22:38 orlock i've got the makerbot endstops too
22:42 Tom_itx http://www.thingiverse.com/thing:14902
22:42 rue_shop3 GuShH, Ihad to do a lot of hole adjustment on my parts
22:43 rue_shop3 oh I wonder if the bed set
22:43 orlock Tom_itx: nah, they are just simple "U" shapes, 2x have 1 hole per side, 3 of them are longer and have 2 holes
22:44 Tom_itx http://www.thingiverse.com/thing:216179
22:44 Tom_itx that looks like your board
22:45 orlock yeah but not the holder
22:45 Tom_itx http://www.thingiverse.com/thing:291189
22:45 Tom_itx gawd you're picky
22:46 GuShH hole adjustment?
22:46 GuShH because your printed holes are not on size and not round?
22:46 GuShH I'd rather print under-size and ream
22:47 Jak_o_Shadows that was my plan
22:49 Tom_itx http://www.thingiverse.com/thing:40081
22:49 Tom_itx orlock
22:50 Tom_itx http://www.thingiverse.com/thing:55853
22:51 orlock Cheers!
22:53 orlock hmm
22:53 orlock that shows them using the bare switches
23:00 rue_shop3 yea, the more I print, the more I tune...
23:00 rue_shop3 this .5mm head needs a steeper nozzel, the plastic is sticking to the edge and landing in the wrong place
23:10 Hyratel interest poll - a simple bluetooth Flip Phone that can be paired with a tablet/smartphone, but has no Cell radio of its own, and which enumerates as a bluetooth headset
23:20 Casper Does anyone here do brazing with mapp gas?
23:24 DagoRed I did once, worked great at converting a dehumidifier into a beer chiller.
23:25 Casper I have issue finding the right way to do it
23:25 Casper I succede to melt the rod sometime, but I don't know how I did it
23:25 Casper and it solidify and that's it... making more of a mess than a weld
23:26 Casper also, I think my bottle is too empty... might have to take out the new one
23:27 DagoRed the flame can get non-linear when the bottle is getting empty
23:27 Casper where is the hottest part of the flame? it's swirl type flame...
23:27 Casper and what angle should the flame hit the surface?
23:30 DagoRed err... google that
23:31 Casper I find not much info
23:32 DagoRed Well it's more about feeling and practice. The tip is where it will be hottest, a little shy of the tip to be honest.
23:32 rue_shop3 oops, the wire I used for the bed heater isn't the resistance that 30guage should have
23:32 rue_shop3 I'v got a few extra ohms
23:32 rue_shop3 about 230%
23:32 rue_shop3 I may have to make this a 24V bed
23:33 rue_shop3 it heats up to 72c on 12V tho
23:33 DagoRed bed heater for a 3d printer?
23:38 rue_shop3 yea
23:39 Casper DagoRed: look like 10° difference matter, so does 1/8"
23:40 Casper I need to find some other type of brazing rod... one that melt at a lower temp...
23:48 DagoRed Casper: if you solder, brazing has got a similar feel to it.
23:48 DagoRed And by solder.... I am talking like soldering to big stuff.
23:48 DagoRed 75 watt + irons for stained glass and such.
23:49 Casper I soldered 1" copper pipe, it was a piece of cake
23:50 Casper but I always have issue with brazing
23:50 Casper most probably because I'm very very close to the limit of what the torch can do
23:50 Casper and I think one issue is heatsinking of the work due to the clamping
23:51 DagoRed Not uncommon.
23:51 DagoRed One of the guys at my hacker space uses pieces of kevlar or canvas to insolate the clamps.
23:51 Casper atleast one joint is done...
23:51 DagoRed progress
23:52 Casper if it wasn't of the 75$ pricetag of the mapp-oxy kit... and the fact that you have 10 mins of oxygen in the tank... and very very mixed review about the kit...
23:52 Casper or the fact that I can't find any source for silver brazing rod...
23:53 goRed sh
23:53 DagoRed I just followed instruction from a guy at the hacker space.
23:54 Casper brass melt at 1630F... the torch I think do 1700