#robotics Logs
Nov 14 2013
#robotics Calendar
00:28 defaultro hey folks, i don't understand this schematic, http://www.raltron.com/cust/tools/images/voltagedivider.gif
00:28 defaultro does it mean that the resistors are in parallel?
00:28 rue_house heh
00:28 rue_house they are in series
00:28 defaultro got it
00:28 rue_house to the supply
00:28 rue_house tell me why you are trying to understand this scheamtic
00:29 defaultro I'm thinking of lowering the input to my 7805 pin 1
00:29 defaultro from12v downto 8v
00:29 rue_house you dont want to use a voltage divider like that
00:29 defaultro what would happen?
00:29 rue_house http://imgs.xkcd.com/comics/circuit_diagram.png <-- I dont understand that schematic
00:29 theBear i used to have that on my workshop wall
00:30 rue_house defaultro, it changes too much with load, the regulator wont get steady enough power to put out 5V
00:30 defaultro got it
00:30 rue_house defaultro, why do you want to lower the input voltage of your 7805
00:30 defaultro can't believe my buck regulator will arrive 3rd week of Nov. I ordered it 2 weeks ago :(
00:31 defaultro the 7805 w/heatsink is getting to hot
00:31 defaultro really hot
00:31 rue_house must be china
00:31 defaultro yup, china
00:31 rue_house defaultro, how much current is going out of it (into it)
00:31 defaultro 5v
00:31 rue_house current
00:31 rue_house v is voltage
00:31 defaultro oh current
00:31 rue_house do you hav a meter?
00:31 defaultro the power supply is 12v 1.2A rated
00:32 defaultro yes, i have a mmeter
00:32 rue_house yes, what the actual current
00:32 rue_house whats the model of your meter, do you know how to measure current?
00:32 defaultro how do I measure the current of the ps?
00:32 defaultro i think i tried it before
00:32 defaultro i put it to 10A
00:32 rue_house what is the model of your meter?
00:32 defaultro i also moved the red probe to the other port
00:32 defaultro it's a cheap one, china again, lol
00:32 defaultro no brand nor model
00:33 rue_house DT830 stamped in big letters on the front?
00:33 defaultro I don't see any
00:33 rue_house is there still a listing for it on ebay?
00:33 defaultro i see CAT.II
00:33 rue_house look on the fornt
00:33 defaultro and DIGITAL MULTIMETER
00:33 defaultro at the back, just Caution
00:34 rue_house is there still a listing for them?
00:34 rue_house can you show me the seller listing?
00:34 defaultro oh, I bought it on a store here
00:34 defaultro local,, Menards
00:34 defaultro but i can use the 10A dial setting
00:35 rue_house how about a 500mA setting?
00:35 defaultro don't see it
00:35 defaultro i see 200m in DCA
00:35 rue_house what are the mA settings?
00:35 rue_house 200 ok
00:35 rue_house http://www.ebay.ca/itm/New-LCD-Digital-Voltmeter-Ammeter-Ohm-Multimeter-DT830-/400579128145
00:35 rue_house does it look like that?
00:35 defaultro yup, looks like that but yellow
00:36 rue_house yea its a DT830
00:36 rue_house did you pay more than $4?
00:36 defaultro there is small difference
00:36 defaultro yeah, Menards stole from me then :D
00:36 defaultro it's ok, it's 3 yrs old
00:36 rue_house http://www.ebay.ca/itm/DT830B-Digital-LCD-Voltmeter-Ammeter-Ohmmeter-Multimeter-Handheld-Battery-Tester-/230992940049
00:37 rue_house anyhow
00:37 defaultro ok
00:37 rue_house to measure current you put the meter in series with the power supply
00:37 defaultro fyi, I paid $10
00:37 rue_house can you do that?
00:37 defaultro ok
00:37 defaultro yup
00:37 rue_house sometimes its hard
00:37 defaultro on positive ride
00:37 defaultro right
00:37 rue_house put it in series with the voltage going in
00:37 defaultro so multimeter will be part of a line
00:37 rue_house on the 200m setting
00:38 rue_house yup
00:38 rue_house well, hmm, maybe we should use the 10A
00:38 defaultro 200m is very low right? It might ruin the multimeter?
00:38 defaultro yes, I always use 10A
00:38 rue_house when you use the 10A, you have to move the lead to the other hole
00:38 rue_house ok
00:38 defaultro yup
00:38 rue_house see what you read
00:38 defaultro ok
00:38 defaultro let me make sure
00:39 rue_house I'm guessing ebtween .150 and .8
00:39 rue_house +- dont matter, it;ll just read - if your backwards
00:40 defaultro the + from my power supply will connect to any probe say black. The red probe connects to the + on breadboard then a wire from - on breadboard will connect to - of my ps. Correct?
00:40 rue_house yup
00:40 defaultro cool, getting some clip alligators :)
00:44 rue_house power(lost) = (voltage in(12) - voltage out(5)) * current (dunno yet)
00:44 defaultro k
00:45 defaultro turning it on now
00:46 defaultro .45
00:46 rue_house zippo:/files/temp/mp3player# calc "(12-5)*0.45"
00:46 rue_house (12-5)*0.45 -->> 3.150000
00:46 rue_house 3.15 watts
00:46 rue_house ouch
00:47 rue_house that would require quite a good size heatsink
00:47 defaultro ah, that's why 7805 is heating up too much
00:47 rue_house do you have an old scrap pc power supply?
00:47 defaultro maybe
00:47 defaultro why?
00:47 rue_house see if it has a TL494 chip in it
00:47 rue_house :)
00:48 defaultro cool
00:48 defaultro it works the same way as 7805?
00:48 rue_house what do you have that draws .45A of 5V
00:48 rue_house do you have a motor on that?
00:48 defaultro yes
00:48 rue_house no, its switching
00:48 rue_house hah
00:48 rue_house well
00:48 defaultro wait
00:48 rue_house use the 7805 for your chips and do something else for the motor
00:48 defaultro i put the multimeter near the power supply
00:48 rue_house thats ok
00:49 rue_house the current in is the same as the current out
00:49 defaultro i'm really not reading the current of the motor
00:49 rue_house cause its a linear regulator
00:49 defaultro k
00:49 rue_house your reading is the same as the current out of the 7805
00:49 defaultro how doesTL494 work?
00:49 defaultro so my power supply source is bad?
00:50 rue_house its can be set up to switch on whent eh voltage is too low and off when its too high, so you mix it with things and get a switching power supply
00:50 defaultro k
00:50 rue_house no, you need another way to power the motors
00:50 rue_house do you use the 5V for chips and motors?
00:51 defaultro right now, I have a bipolar motor which doesnt have the com anymore
00:51 defaultro it's 4 wire and driven by drv8825
00:51 defaultro i power the drv8825 with 12v using the same ps
00:51 rue_house yea, the motors dont need the amount of regulation the 7805 has
00:51 rue_house can you just use a computer supply for the project?
00:51 defaultro yup, I actually set the drv8825 at 0.4A only because that's the rate of my motor
00:51 rue_house they have 5V at like 20A
00:52 defaultro that's big if i'll use a computer ps
00:52 defaultro 20A is too high :D
00:52 rue_house I ont know the project :)
00:52 defaultro :)
00:52 rue_house the device will only use what it uses,
00:52 defaultro my drv8825 is only rated 2.5A with heatsink
00:52 rue_house hey dont forget to change that meter lead back to the other terminal
00:52 defaultro yup, i already did
00:52 rue_house yup
00:53 rue_house sorry, I ahve to go to bed
00:53 defaultro sure, np :)
00:53 rue_house you should ahve a different supply fo the motors
00:53 defaultro not this one?
00:53 defaultro it's working great
00:53 defaultro what's your recommendation?
00:58 GargantuaSauce he gave one, a computer p
00:58 GargantuaSauce ps
00:58 GargantuaSauce which i too recommend, they're handy as hell
01:11 defaultro i'm back
01:11 defaultro but 20A is too much
01:12 defaultro and it's heavy too
01:12 defaultro actually, if I'll be using this device, I'll be using a 8000mAh battery
01:12 defaultro i mean, i'll be using this devcie outside like on a park
01:13 GargantuaSauce the current rating of a power supply is a limiting factor
01:13 GargantuaSauce it doesn't "force" that much current through the device
01:14 GargantuaSauce if the voltage is the same the current draw will be the same
01:14 GargantuaSauce anyway it'd work well as a general purpose supply while you're working on it
01:14 GargantuaSauce and other projects
01:19 defaultro oh ok
01:19 GargantuaSauce (and here's your daily reminder to do your homework to clear up misconceptions like that :V)
01:19 defaultro i thought the current rating of a power supply will supply that current to a device. I was wrong.
01:20 defaultro it only means, that the power supply can supply that much current when a device requests it
01:20 GargantuaSauce nope, it's the current at which the voltage will start to drop or it will shut down or catch fire
01:20 GargantuaSauce yeah
01:20 defaultro got it
01:20 GargantuaSauce though there is no "request", it's resistance
01:20 defaultro oh ok
01:21 defaultro how about voltage? Let's say a device like a vacuum flourescent display requires 5v and our power supply is 12v, I remember my vfd's screen got really weird
01:22 GargantuaSauce when the voltage is too high, more current will flow through it than it's designed for
01:22 defaultro k
01:22 defaultro so it was the current that caused the vfd to do some weird behavior?
01:25 GargantuaSauce well the digital part probably went into some protection mode to avoid releasing its magic smoke
01:25 defaultro k
01:25 GargantuaSauce and the orange line was too much power going through the cathode so it heated up like a lightbulb filament
01:26 defaultro yup, that's what it did
01:26 defaultro i remember seeing 10v
01:26 defaultro glad it didn't break
01:26 Triffid_Hunter things like stepper motors need the right current. most things need the right voltage or they get sad
01:26 defaultro yup
01:26 Triffid_Hunter for reference, LEDs are also current driven
01:26 GargantuaSauce or angry :V
01:27 defaultro ah, so we can use pot to dim the leds
01:28 defaultro btw, since the rating of 1.2A that is written on the power supply housing, am I correct that a ps that is connected to a power outlet but not driving any device, current will be 0
01:28 GargantuaSauce V=IR
01:28 defaultro however, voltage will be there
01:28 GargantuaSauce an open circuit has a near-infinite resistance
01:28 defaultro k
01:30 defaultro is the buck converter I bought good enough to act as a current limiter too?
01:31 GargantuaSauce it is designed to provide a constant voltage
01:31 defaultro the buck converter will replace the 7805 that I installed to power the 5v vfd
01:31 defaultro I'll have to check the datasheet of the vfd
01:33 defaultro what field should I look for? http://media.digikey.com/pdf/Data%20Sheets/Noritake%20PDFs/GU140x32F-7000.pdf
01:33 GargantuaSauce i don't know what you're looking for either
01:34 defaultro the current it pulls, so i think it's 0.4A
01:34 GargantuaSauce that i what it says
01:34 defaultro ok
01:35 defaultro this is the buck converter I bought, http://www.ebay.com/itm/180947008880?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
01:35 defaultro I forgot who suggested that to me
01:35 defaultro i think it was on this channel
01:35 defaultro maybe it was Gush
01:47 defaultro ok folks, I'm taking off early today. Have a great night
06:43 Triffid_Hunter http://spectrum.ieee.org/automaton/robotics/aerial-robots/iros-2013-should-quadrotors-all-look-like-this
07:09 GuShH Triffid_Hunter: the answer is: who gives a flying dick.
07:10 Triffid_Hunter GuShH: or cat?
07:11 GuShH that too.
07:11 GuShH enough of quads!
07:11 GuShH oh look a quadrotor "wheel" that can fly, float and roll.
07:13 GargantuaSauce http://www.youtube.com/watch?v=zU-ur7PL9Vk did someone say flying dick?
07:13 GuShH no please
07:14 GuShH I wANT ONE I NEED ONE
07:15 GuShH GargantuaSauce: who was flying it anyway
07:15 GargantuaSauce a serious political activist, obviously
07:15 GuShH serious in my language means the heli gets to carry a semi-automatic firearm
07:16 GuShH NOW THATS ACTIVISM
07:16 GuShH sweet http://www.youtube.com/watch?v=wEJYAYX9PJk
07:17 GuShH the guy's face... and redbull pays him? amazing!
07:17 m_itx turns down GuShH's volume for the morning
07:17 GuShH Tom_itx: Notice I wasn't the one to suggest dildos
07:17 Tom_itx i wasn't looking either
07:17 GuShH And my video is just an RC heli.
07:18 GuShH (the redbull cobra)
07:18 GargantuaSauce the guy is just holding the controller and pretending it's actually an rc helicopter
07:18 GargantuaSauce but really there's a midget in there with the stick
07:18 GuShH heh that thing is beautiful
07:19 GuShH where do you even source the blades from?
14:25 GuShH Hrmm no wonder this other place had cheaper aluminum prices, they were trying to pass 2005-T3 as 6061-T6 (which is what I requested) ... the hell man? were they going to sand the markings off? they assumed nobody would notice?
14:26 GuShH I'm not sure if 2005 is a standard everywhere but around here it means "the remaining shit that should've been thrown out but instead has been further proccessed into what seems to be aluminum but hardly is" that stuff is almos impossible to anodize properly
14:26 GuShH lots of copper, lead, etc. But I hear it turns nicely, what gives?
14:32 chupacabra most hobbyists wont know the dfference
14:45 Tom_itx you can acid test it i think, if you know how to read it
14:46 Tom_itx 7075 is good too
14:53 chupacabra 7075 is the best IMHO. Aircraft landing gear stuff. Machines like a dream too.
15:45 GuShH Tom_itx: acid test it? now you've got my attention!
15:45 GuShH I'm not sure I can source 7000 series at all, it's probably made by request or it's all exported
16:58 robotustra halo
17:02 Tom_itx GuShH i think i can get _some_ 7000 here
17:03 robotustra what is 7000?
17:03 Tom_itx aluminum alloy series
17:05 robotustra ah, it's for aeronautics usually?
17:05 robotustra I think I use 6560
17:05 robotustra or something like this
17:06 Tom_itx aero yes
17:07 robotustra is it thermo treated?
17:07 Tom_itx generally in T state yes
17:16 defaultro hey guys, are you familiar with timer 555?
17:18 Tom_itx never heard of it
17:18 Tom_itx tell us all about it
17:20 Tom_itx http://www.555-timer-circuits.com/
17:20 GuShH is it a new IC?
17:20 Tom_itx pfft
17:21 Tom_itx GuShH i'd swear i heard the local scrap talking about testing al with acid
17:21 Tom_itx maybe it was for a specific type... i can't seem to find anything on it
17:21 GuShH acid music?
17:21 GuShH I use HCL to dissolve alu in brass
17:21 GuShH I've had to deal with broken fittings that are impossible to remove with a broken stud remover
17:22 GuShH so I machine the bulk out and eat the rest with HCL
17:23 GuShH works wonders, the worst part is the last little bits of aluminum that remain inside the thread, you gotta clean it up with a tap or leave it overnight (doesn't seem to eat up this specific type of brass)
17:23 GuShH maybe it does but at such a low rate I couldn't tell, it does come out spotless.
17:25 GuShH lol there are scrap metal forums...
17:25 GuShH sigh
17:30 Tom_itx ok defaultro, what did you wanna know about it?
17:31 defaultro sorry, wife asked for help
17:31 defaultro I'm back now
17:31 GuShH If you are already using an mcu, why bother with a 555?
17:31 Tom_itx that _was_ quick
17:31 GuShH ha
17:31 Tom_itx :)
17:31 defaultro i just quickly saw a thread about 555. Let me do research first on what it can do
17:32 Tom_itx what did you have in mind for it?
17:32 GuShH you shouldn't ask what it is, you should ask what it isn't. icecream is one of the answers.
17:32 Tom_itx if it's 555, it's already been done by someone
17:32 defaultro GuShH: I was thinking of removing the software timer code in my Arduino and use 555 instead
17:32 Tom_itx google what you want done
17:32 GuShH hu
17:32 Tom_itx it's not that accurate or stable
17:32 GuShH keep in mind the common 555 is not stable
17:32 GuShH it's noisy
17:32 GuShH as well (on your power rail)
17:33 GuShH there are better versions, but this is not the droid you're looking for.
17:33 defaultro I mean, I'm using millis() to track the time
17:33 robotustra I did PWM on the base of 555
17:33 robotustra for DC motor
17:33 GuShH yes but in russia that's a common practice, robotustra.
17:33 GuShH Hey we've all done that
17:33 robotustra I did it in canada
17:33 defaultro i was thinking that since 555 is a timer, I can tell it to a specific time to trigger a switch
17:34 robotustra now I use controllers only for PWM
17:34 GuShH not so specific, not so reliably specific.
17:34 defaultro I can't do that with milis() inside loop() in arduion
17:34 defaultro oops
17:34 GuShH get the hell away from arduino
17:34 defaultro damn keyboard corrector
17:34 defaultro I can do that with milis() inside loop() in arduion
17:34 GuShH do you type with your nose?
17:34 robotustra today at work I programmed DACs with i2c
17:34 GuShH ARDUINON
17:35 defaultro it always suggests spelling corrections, lol
17:35 robotustra millis()
17:35 GuShH arduinoff
17:35 GuShH free vodka in every box
17:35 defaultro :)
17:35 robotustra use delay instead
17:35 GuShH robotustra: miller();
17:35 defaultro delay isn't good, it's bad
17:35 robotustra why?
17:35 defaultro because, I don't want to block other resources
17:36 defaultro millis() is working very well for me
17:36 robotustra ok, I'll try right away
17:36 defaultro now, I would like to implement the same logic into the 555 timer
17:36 defaultro if I do delay(20000); I can't do anything until that's done
17:36 defaultro i won't be able to go to different menus
17:37 GuShH are you talking about the programmable 555?
17:37 GuShH aka an avr with some silly firmware flashed in
17:37 defaultro GuShH: 555 timer
17:37 defaultro i don't know if there are different 555
17:37 Tom_itx defaultro, why do you need such a large delay?
17:37 GuShH there are tons
17:37 defaultro it can be even 30000 for 30 seconds
17:37 Tom_itx i'm not sure delay(20000) will work anyway
17:37 defaultro of course
17:37 defaultro it's 20secs
17:37 GuShH use an RTC then
17:37 Tom_itx there's a limit on how big a number you can put into the function
17:38 defaultro so 555 isn't an RTC?
17:38 Tom_itx forget what it is
17:38 Tom_itx hell no
17:38 GuShH it's not
17:38 defaultro oh oh, I was wrong
17:38 Tom_itx get a dallas rtc for that
17:38 defaultro k
17:38 GuShH or texas!
17:38 Tom_itx 1307 or such
17:38 Tom_itx i forget
17:38 robotustra if you want not to interfire another process go low level
17:38 robotustra don't use arduino
17:38 ShH hands robotustra the p
17:39 defaultro so with rtc, I'll be able to tell it to "hey, in 15 seconds, send a HIGH on opti isolator". Correct?
17:39 Tom_itx depends on the one you select
17:39 GuShH you can know when the 15 sec have gone by and set a high on any gpio you desire
17:39 Tom_itx or how you program it
17:39 defaultro k
17:40 robotustra you have to know exactly the number of ticks elapsed
17:40 robotustra I don't think arduino handle realtime
17:41 Tom_itx some avr allow for a 32khz crystal on a timer you could use for that
17:43 defaultro ah, this is the reason why I want to try 555 - http://www.azega.com/555-time-lapse-intervalometer/
18:17 GuShH 6000 series can have iron as part of the alloying elements?
18:44 oscar1 so robots, they're fun
19:14 GuShH the hell.. our DMV is on FaceBook.. and they're actually helpful, what's going on??
19:15 GuShH Also for some reason you don't need to pass anything but a theoretical exam for motorcycles in this zone, weird...
19:15 GuShH No wonder idiots get squished on a daily basis
21:42 Curious tempts GuShH with some pictures of ladies using lat
21:44 GargantuaSauce ooh, look at the headstock on that one
21:45 MrCurious you pin me right round baby, oh yeah right round
21:47 robotustra boom boom boom
21:47 robotustra go work, stop talking
21:47 robotustra relax, just kidding
21:52 GuShH o.o
21:54 MrCurious GuShH: check pm's
21:54 GuShH MrCurious: https://www.youtube.com/watch?v=J7CQP8Ein6s
21:54 GuShH she had some tracking issues right there, she's sleeping now... those must be some potent drugz
21:55 MrCurious awwww
21:55 GuShH they took good care of her, she won't be fooling around with cats no more... in 10 days she needs to visit the vet to get the stitches out
21:56 GuShH not sure what they use to close them up, super glue and stitches?, no blood whatsoever.
21:56 MrCurious ours do that after surgery
21:56 GuShH first time I see a drugged cat
21:57 GuShH (act drugged) ... I've had my other cat drugged but he just went out and woke up fine
21:57 ShH reads
22:00 MrCurious fed a raccoon tonight
22:00 MrCurious it ate cat food 2 feet from me
22:00 MrCurious named it rocckey
22:00 MrCurious couldnt really see its face, it was wearing a lone ranger mask
22:05 MrCurious GuShH: you arent going to comment?
22:05 MrCurious i am crushed!
22:17 GuShh_ MrCurious: I think you've got a couple midget slaves working for you
22:19 MrCurious how is that
22:19 GuShh_ Hrmmm should I convert my lawnmower to propane?
22:19 MrCurious and who told you!
22:19 GuShh_ I need to run some numbers on that
22:19 MrCurious hydrogen would be better
22:19 MrCurious or lithium
22:19 MrCurious added bonus of a self destruct system
22:19 GuShh_ heh
22:21 Tom_itx GuShh_, convert it to napalm
22:21 Tom_itx that will clear it just as well
22:21 GuShh_ they claim propane will give you higher torque.... I always thought in general compressed gasses gave you less overall power
22:22 GuShh_ like LPG on cars
22:22 MrCurious so a robot that has propane burners to incinerate th grass as it rolls over while preventing the escape of fire
22:22 MrCurious i like it
22:23 MrCurious very anti-giya
22:23 Tom_itx who said anything about containment?
22:23 MrCurious well, removing that constraint would give a boost to efficiency
22:23 Tom_itx and add a flame thrower for those hard to reach areas
22:24 Curious boggles on how to true up some aluminum planks to perfect right angles, as the cuts are out by ~1MM across a 6"
22:25 Tom_itx what tools do you have at your disposal?
22:25 MrCurious i have a sliding table router table....
22:25 MrCurious sliding table saw (that i cant master the tuning of)
22:25 MrCurious grinder
22:25 Tom_itx you _can_ cut aluminum wiht a table saw
22:25 MrCurious thats how i made the cut that was not perfect
22:25 Tom_itx you need the right blade
22:25 MrCurious i have a aluminum specific blade
22:26 Tom_itx then you didn't have it set up right
22:26 MrCurious yes, the sliding table is giving me grief
22:26 MrCurious the router table has a more accurate sliding table
22:26 Tom_itx i'm afraid the router would grab the end
22:27 Tom_itx taking a chunk out you may dearly miss
22:27 Tom_itx have a shop square it up for you
22:27 Tom_itx any nearby?
22:27 GuShh_ use your mill?
22:28 Tom_itx !
22:28 Tom_itx brilliant
22:28 Tom_itx :)
22:28 Tom_itx i think it's for the mill
22:28 GuShh_ I thought he had a milling machine!
22:28 GuShh_ X3 or X2?
22:29 Tom_itx he is building one i believe
22:29 GuShh_ That as well
22:29 MrCurious never got the mill to be useful other than a super drill press
22:29 Shh_ would've bought a big old bridgeport and converted that to cnc, just beca
22:29 MrCurious suppose i could hand file it
22:29 GuShh_ MrCurious: do you have collets, clamps, everything?
22:29 MrCurious or get a belt sander...
22:29 MrCurious for what
22:30 GuShh_ your mill
22:30 MrCurious router has collets
22:30 Tom_itx if you hand file it, set it on a square table just overlapping the edge so when you file it, you file it down to the table edge which will be square
22:30 GuShh_ don't use wood router bits on metal!
22:30 MrCurious small mill has a 50 pc steel hold down kit
22:30 GuShh_ the one that comes in the red wanky holder?
22:30 Tom_itx otherwise you will get rounded ends
22:31 MrCurious all my bits are carbide
22:31 MrCurious yeah, sander may not be the answer
22:31 MrCurious i have a wet/dry grinder
22:31 GuShh_ have it flycut by someone with a real mill :p
22:31 MrCurious perhaps i should just tune the table saw better
22:32 MrCurious that is admitting defeat!
22:32 GuShh_ find out where the problem is!
22:32 GuShh_ aside from possibly being chinese
22:32 MrCurious i know where the problem is
22:32 MrCurious itss with the wetware
22:32 MrCurious i am the problem :)
22:33 GuShh_ well it's meant for wood
22:33 GuShh_ nothing too precise
22:33 MrCurious yeah. contractor saw
22:34 GuShh_ that's like whining about poor cuts on a chop saw "why does it have burrs! why is it slightly off!"
22:34 GuShh_ actually the DeWalt wheel I got is pretty good in that regard, almost no burrs just a few on the end cut
22:34 GuShh_ and here's something they don't tell you... use a levelled floor or surface, otherwise the stamped steel bed will flex and your cut will be at an angle, ask me how I know!
22:35 GuShh_ they do show how to level the work with blocks but nothing about the machine itself.
22:36 Tom_itx nothing more annoying than not having the right tools to make something proper
22:38 MrCurious i have no burs on teh aluminum cuts. they are glassy
22:39 GuShh_ MrCurious: I'm talking chop saw (with the common abrassive cutoff wheels)
22:39 GuShh_ usually you get a poor cut, they're for basic construction work...
22:40 GuShh_ but the quality of the wheel plays a big role anyway, similar deal with blades... you get what you pay for!!
22:40 MrCurious ahhhh
22:41 GuShh_ I kept getting skewed cuts and I couldn't figure it out until I noticed how badly the base would flex based on how uneven the floor surface was... Sometimes the tools are fine, it's just you :p
22:43 GuShh_ MrCurious: the tools you are starting with are not exactly precise, if you want your cuts to be dead on you'll have to use some elbow grease or figure out a cheap way to square up the fence, is it off sideways or are you getting an angled cut? maybe the blade is not 90° to begin with, those adjustable mechanisms are not precise at all!
22:44 MrCurious not using afence
22:44 MrCurious well, one ___ |
22:44 MrCurious where _ is fence and | is blade
22:45 GuShh_ whatever your guide is must not be exactly true!
22:45 MrCurious need to tune the 4 screws that hold table and aligne its travel
22:45 GuShh_ I'd be scared to cut aluminum with one of those contractor saws! are you using carbide tipped blades?
22:45 MrCurious guess i need to cut some mdf to true it
22:46 MrCurious i am using a $50 blade specifically designed for aluminum
22:46 GuShh_ don't fool around with your safety gear, if one of those tips flies off it could be a very bad day for mr catlady.
22:46 MrCurious maybe more $
22:46 MrCurious and its carbide
22:46 GuShh_ even the most expensive blades loose teeth specially when they grab
22:46 MrCurious always wear premo goggles
22:46 MrCurious and stay out of line with the blade with anything i cant live without
22:47 GuShh_ that's just common sense
22:47 MrCurious i have the grown up tools :)
22:47 GuShh_ chainsaws are just as lethal!
22:47 MrCurious i just lack all that class time showing me how to use and tune it
22:47 MrCurious only scarry tool is the router
22:47 GuShh_ it helps to picture yourself after the injury, as adam savage suggests... it works.
22:47 MrCurious i am convinced routers have an agenda
22:48 GuShh_ the only scary part is the sheer speed and sound, the rest is not scary for me.
22:48 GuShh_ angle grinders can be just as lethal
22:48 GuShh_ or rather, dangerous.
22:49 GuShh_ hey all you need to know is how to place it on the table, how to pick it up and how to handle it, the rest is magic.
22:49 Shh_ loves his angle gri
22:49 MrCurious i have had routers shoot work pieces at walls
22:49 MrCurious and in early days, my hand wanted to follow the piece through
22:49 MrCurious turns out i was climb cutting when i shoulldnt have
22:49 GuShh_ do you often check for play on the router spindle? I wonder what happens when one of the bearings goes
22:50 MrCurious since then i got a better router and a solid steel sliding table for it
22:50 MrCurious the router gives me a pattern on the cut that has a bible page variance
22:50 GuShh_ I always wanted a router, but without the table it's a bit limited.
22:50 MrCurious i think its a harmonic phenemenom
22:50 MrCurious from teh spiral cutter
22:51 MrCurious or a function of my feed peed
22:51 MrCurious speed
22:51 GuShh_ or a combination of it all
22:51 MrCurious http://www.grizzly.com/products/Router-Table/G0528
22:51 MrCurious to end speculation
22:52 GuShh_ why is it in spanish! why do they assume I speak spanish!
22:52 GuShh_ RACISTS
22:52 MrCurious odd. its in engrish here
22:52 GuShh_ "his IP is from Argentina, he must be a MEXICAN"
22:52 GuShh_ indeed, geo-bullshitting
22:52 MrCurious your not?
22:52 Curious
22:53 GuShh_ not really
22:53 MrCurious just enjoy the pictures
22:53 MrCurious you dont need the decorative text :D
22:54 GuShh_ you should read the instruction manual, I bet it mentions climb cutting.
22:54 MrCurious climb cutting was using a crap router and crap home made table back when i had had a router for all of 15 minutes
22:54 MrCurious now i know when to climb cut and how to do it
22:54 GuShh_ but hey climb gives you a better finish, at least it does in metal!
22:55 GuShh_ it just takes a stiffer machine and a bigger set of balls.
22:55 MrCurious but that was back when i learned of the routers agenda
22:55 MrCurious back in a few...
22:55 GuShh_ if it's a bendy machine the results will be worse.
22:56 GuShh_ http://www.grizzly.com/products/T10157 why? that's like buying a cart for your brand new welder
22:57 Shh_ shakes
23:07 wildmage ooh workbench
23:07 wildmage with steel legs
23:10 MrCurious i just worked out how to tune the saw/sliding table
23:10 MrCurious mount a depth guage to the sliding table vs the blade
23:10 MrCurious then adjust to perfection
23:14 rue_house wild!
23:14 rue_house hows things?
23:14 rue_house you still doing robotics?
23:15 rue_house wildmage,
23:35 MrCurious solved
23:36 MrCurious used a t-slot miter, tuned the 2 screw miter track and miter guage, and got a perfect 90 6" cut
23:37 wildmage rue_house, yes I am!
23:38 wildmage well, sadly I've been a little short on the hardware, but I've become crazy good with the algorithms
23:39 wildmage lately I've been doing space stuff
23:43 MrCurious disco break! http://www.youtube.com/watch?v=_JoZS6LgqYI