#robotics Logs

Nov 27 2017

02:38 AM rue_bed: like I said, 8 bit
05:48 AM HumanSheeple: https://imgur.com/a/HBNza which is the right one A, B, C or D ?
06:03 AM Tom_L: A&C & B&D are the same
06:04 AM Tom_L: none are right, either the battery is dead or the bulb is burned out
06:05 AM HumanSheeple: How would you hook up 3 9 volt batteries in parellel?
06:06 AM Tom_L: i would get one larger capacity battery
06:07 AM HumanSheeple: They don't have them here
06:07 AM Tom_L: - to - and + to + then if you still want 9v out
06:07 AM HumanSheeple: Yep that's what I'm trying to achieve
06:08 AM Tom_L: - to + if you want 27v
06:08 AM HumanSheeple: no thank you, 9v is fine, 1 amp
06:08 AM Tom_L: 9v batteries won't last long
06:08 AM Tom_L: the cells are too small
06:10 AM HumanSheeple: Yes I know, but it's all I can get
06:10 AM HumanSheeple: It's all they sell at the little corner store
12:21 PM HumanSheeple: Tom_L: thanks for your help, the laser was a huge success, 3x 9v batteries this thing can light up stuff hundreds of meters away and can cut through black tape: https://youtu.be/6fBW2Gus52A
02:12 PM AchiestDragon: rue_mohr foating point maths for an 8 bit cpu ,, ok so 6502 should be easy enough for you to translate to whatever 8bit cpu http://codebase64.org/doku.php?id=base:6502_6510_maths
06:07 PM robotustra: piupiu
06:25 PM z64555: "floating point" "8 bit cpu" somebody's going to have a bad time
06:29 PM veverak: :D
06:29 PM veverak: hmmm, 8 bit floating point
06:29 PM veverak: interesting
06:32 PM AchiestDragon: well if you must , but id prob update the cpu to one with a maths co proc if you need to do it at any speed , when you think about though its good enough if you want to do simple complex math and have the time for it to calculate
06:33 PM veverak: well
06:33 PM AchiestDragon: the average scinetific calculator would be fine for example where as much as a second for it to come up with a complex result is not out of the norm
06:34 PM veverak: I think it is more reasonable to invest into 32 bit cpu
06:34 PM veverak: nto sure hte "invest" is proper term, as they are cheap these days anyway
06:34 PM AchiestDragon: true , and most with a fpu so you dont need to do it in software
06:35 PM veverak: exactly
06:36 PM AchiestDragon: the only altrenative i could think of would be use a 8087 intel 8086 co proc it still has an 8bit bus so could feasably be used on a native 8bit cpu
06:37 PM veverak: but
06:37 PM veverak: why?
06:37 PM veverak: :D
06:40 PM z64555: i thought calculators still did everything in fixed point
06:40 PM z64555: the simple ones, I mean. not including graphing calcs
06:40 PM z64555: also there is a 16 bit precision floating point standard, but I'm not sure if there's an 8-bit precision
06:42 PM AchiestDragon: ask rue when he gets back , he was interested in knowing them , although its good coading examples that can be usefull when needs must and also for explaining how to do complex banary maths
06:45 PM AchiestDragon: theres ieee standar float formats defined so co-procs and software foating point formats are conventional for 16 , 32 , 64 and there should be one for 128 bit formats also but not for 8 bit ,
06:48 PM AchiestDragon: that page by the way is the libs a lot of the "demo" software for the old 8bit micros used so it is worthy of some credit for what they did
06:49 PM AchiestDragon: but today it only shows how 8bit systems need to be pushed to the limit to get them to compute like that
06:51 PM AchiestDragon: and how to sacrifice precison for speed while still keeping some degree of acuracy in 8 bits
07:01 PM AchiestDragon: ho yea the other way ,, an fpga and https://opencores.org/project,openfpu64 prob cheaper than finding a rare functional 8087 and prob faster
07:03 PM AchiestDragon: Multiply has a fmax of 70Mhz on a Cyclone II. yea faster , just a tad more than 12.5mhz
07:11 PM Tom_L: rue_shop3, http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Z_Axis_Support1.jpg
07:11 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Z_Axis_Support2.jpg
07:11 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Z_Axis_Support3.jpg
07:18 PM AchiestDragon: sweet
07:56 PM rue_shop3: ?
07:57 PM rue_shop3: I'd think your better off with a plate across the whole back of them
08:30 PM Tom_L: rue_shop3, plate where?
08:30 PM Tom_L: there are spacers that go between the uprights welded in
08:54 PM AchiestDragon: https://drive.google.com/file/d/1R_D3SLbbiU5RMgtL8DXTSMUaOQFt7KIs/view?usp=sharing i'd of prob used this rather than the slotted plates to hole the braceing bar . as the slotted design can tend to slip and be a pain to adjust accuratly
08:56 PM AchiestDragon: although would put washers in there also but no time on a quick cad schetch
09:03 PM AchiestDragon: or https://drive.google.com/file/d/1R_enadu4nOVfiCV7pYpHpiV4mJkhLAtK/view?usp=sharing if wobble on the other axis is a problem
09:05 PM AchiestDragon: although since the top of that has a pivot it should be fine with the first
09:16 PM Tom_L: i'll see how it looks once i tack it
09:17 PM AchiestDragon: when you have the slotted type like you have done you often find that it moves up or donw a bit as you tighten it up making alligning it harder and you have to hold it in place while you tighten it up
09:17 PM Tom_L: i considered adding a turnbuckle to the back of it too
09:17 PM Tom_L: adjust it with that then tighten it up
09:17 PM Tom_L: i'll think about it a bit
09:19 PM AchiestDragon: k
09:22 PM Tom_L: on the front 2 i thought about drilling access holes from the bottom to put nuts on the bolts so it's not reliant on the threads in the base tube
09:22 PM Tom_L: dunno if that would weaken it too much
09:22 PM Tom_L: probably not
09:25 PM AchiestDragon: well they cut a series of big holes allong the center of I beems just for the purpous of loosing weight without comprimising the beams strenth , as long as the hole is more than 75% the width of the section side it should be fine
09:25 PM Tom_L: scrap metal is cheap, if it doesn't work out i can always make another one
09:27 PM Tom_L: if i had a way to cut it, i thougt about a large square column for Z
09:28 PM AchiestDragon: k , from experiance anything that has a slotted mount like that if you remeber things like some of the cheap lcd mounts and gps mounts , all use them and one slight turn and they loosen up , its just is , and often overlooked
09:28 PM Tom_L: mounted on plates
09:28 PM Tom_L: i know
09:28 PM Tom_L: i may change that
09:30 PM AchiestDragon: shanme as i have to say what the ones you made do look well done , the only thing that helps is having a ribbed surface to stop it slipping but that compramises allignment on what your doing
09:30 PM Tom_itx: https://i.pinimg.com/originals/55/74/78/557478643ca24dc56b8641a42068e911.jpg
09:30 PM Tom_L: even that one has the upright bolted
09:30 PM Tom_L: could use cerated washers
09:32 PM Tom_L: looks like it uses counterweights on Z too
09:33 PM AchiestDragon: counterweights are easy to retrofit if you need to , just steel wire pully's and weights
09:33 PM Tom_L: i have one on my sherline
09:37 PM Tom_L: i really just didn't want to make a gantry style mill
09:38 PM Tom_L: i'm sure i'll learn alot from this one
09:40 PM Tom_L: one of the main reasons for doing it
09:41 PM Tom_L: did you see the control for it?
09:41 PM Tom_L: it's on the sherline right now
09:41 PM AchiestDragon: no
09:41 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Control2.jpg
09:42 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/Control1.jpg
09:42 PM Tom_L: stepper drivers are behind the heatsink
09:42 PM AchiestDragon: i got a pic of the controls i used somware also , after convering them in to a 3d printer
09:43 PM Tom_L: i did it on the sherline knowing i would update some day so everything is built to handle bigger steppers etc
09:43 PM Tom_L: alot of surplus stuff in it
09:43 PM Tom_L: i'm sure a torroid would be more efficient or a switcher
09:44 PM Tom_L: the mount you showed is how they do all light poles etc
09:47 PM AchiestDragon: https://drive.google.com/file/d/1Grt1KDSx6hd58fnzcQ344fNHQyIeqf2m/view?usp=sharing
09:50 PM AchiestDragon: the big torod gives 48v @10A for the heated bed , i ended up chaning it up with another 2 psus to get it to give 80v at 10A but burned out the octal relay and melted its base , i have a 40A contactor 3 phase din mounting kicking arround so will replace it with that and get a bigger toroid when i get arround to it
09:51 PM AchiestDragon: and prob want to upgrade that controler to one of the new 32bit ones at the same time
09:52 PM Tom_L: take a look at mesa stuff
09:52 PM Tom_L: i like it
09:52 PM Tom_L: and linuxcnc
09:53 PM AchiestDragon: but have to pull the machine appart to get it out of the room its in to work on it :( so looks more like i may just get a tevo delta in the next few weeks
09:53 PM Tom_L: gives me 72 io before i do any expansion with sserial etc
09:53 PM Tom_L: all the stepgen etc is done off a cpld
09:54 PM Tom_L: their newest ones are ethernet based
09:55 PM Tom_L: mine is still parallel port to the mesa card
09:55 PM AchiestDragon: well will se , even though im looking at buying one it would still be goos to get the my current one working at some point , just not practical at present to do so
09:57 PM Tom_L: nice thing about the mesa cards is you can firmware program the functions if you need to change the configuration
09:57 PM AchiestDragon: it needs a new print head and feed so since the steppers and frame would take it i was thinking of upgrading those to a full 3 colour head
10:02 PM AchiestDragon: yea one of the probs nealry all new laptops /netbooks lack all basic i/o like printer /serial and in some cases only have one usb
10:05 PM AchiestDragon: added to that the usb driver that bricks 80% of the chinese copies of the usb device programmers
10:08 PM AchiestDragon: https://arstechnica.com/information-technology/2014/10/windows-update-drivers-bricking-usb-serial-chips-beloved-of-hardware-hackers/
10:10 PM Tom_L: i made my own usb programmer
10:10 PM AchiestDragon: too late saying there recoverable after all the parts have been trashed and are not
10:10 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/boards/USBTiny_Mkii/USBTiny_Mkii_index.php
10:11 PM Tom_L: don't do them anymore though
10:14 PM AchiestDragon: kool
10:15 PM Tom_L: i cut all the blue cases out on the sherline
10:18 PM Tom_L: anyway, time to sleep
10:26 PM rue_shop3: hmm
10:28 PM rue_shop3: Tom_L, how long a drag chain did you want?
10:39 PM AchiestDragon: this is what happend to the laptop with the driver issue https://drive.google.com/file/d/170yphVieB3H1bP7TC9K4-s6wtzYB2X7W/view?usp=sharing
10:43 PM AchiestDragon: and the othere reason i nolonger use windows or other m$ software / drivers where ever posible
11:24 PM rue_mohr: it looks not as much like a driver issue as a drove-over problem
11:29 PM AchiestDragon: 2 2.5g 8 chan rc controlers , 1 quadcopter , after 3 controler replacments all bricked , laptop was least of my worries ,, and after finding it was a driver issue ( at the time no fix controlers all bricked perminent) then it was called for
11:30 PM AchiestDragon: 2 months later what theres a fix they say , not going to answer that
11:31 PM mrdata__ is now known as mrdata
11:31 PM rue_mohr: not sure why but almost every audio system these days seems to be about 3db short of the volume I need
11:31 PM AchiestDragon: ftti blaming it on the copies but there the ones who bricked it not for the manufactureres but the customers that have no idea if the part is a copy or fake
11:32 PM rue_mohr: so $@%^ it, I'm going to make an inline 3db amp for audio lines
11:35 PM Triffid_Hunter: AchiestDragon: oh lol the FTDI debacle? yeah that was a bit rough, glad I'm using linux which has its own driver :P
11:35 PM Triffid_Hunter: wasn't that years ago though?
11:36 PM AchiestDragon: yea , only just getting back into the hoby as it was the last starw back then
11:37 PM Triffid_Hunter: to be fair, similar stuff happens in linux (see the e1000 mess) but at least that's inadvertent rather than calculated
11:37 PM AchiestDragon: but thats corparate usa dont give a S**T about who suffers so llong as they make a F!!!ing point about "there" earnings
11:39 PM AchiestDragon: true , inadvertant is not the same as premeditated is it
11:40 PM AchiestDragon: audio yea think there was some push over headphone levels that forced them to put hard limits in actualy check the source as thats may be where the limits are
11:45 PM AchiestDragon: linux has 2 maser volume settings depending on what sound backend your using , pulse audio for backend and another if your using jack / alsa sometimes in the driver config settings you find that the volume level you set there is the max it will give and all other uilaties dont change that , they adjust volume ether by software or on another mixer level rather than the actual master level
11:47 PM AchiestDragon: qite a lot of kit though does seem to have some sort of input limiting built in that gives a silly 3db drop to like though hdmi or if it thinks theres headphones connected
11:47 PM Triffid_Hunter: my GF's laptop goes to 157% volume, no idea why
11:50 PM AchiestDragon: some safty standard where 100% is normal max and ususaly it pops up with a waning that going over that level may cause damage to hearing , ,where its more like someone may actualy hear it without it needing to craft a paper horn to stick infront of the speaker or one like they used to have on the old gramaphone players
11:50 PM z64555: as well as the whole neighborhood
11:51 PM AchiestDragon: supprised someone has not come up with a 3d printed phone case that has one built in
11:53 PM AchiestDragon: spoke too soon https://drive.google.com/file/d/170yphVieB3H1bP7TC9K4-s6wtzYB2X7W/view?usp=sharing
11:53 PM AchiestDragon: lol
11:55 PM AchiestDragon: https://i.amz.mshcdn.com/-LyzbUmHOvw5Q3FqtSYlM0lSNAE=/fit-in/850x850/http%3A%2F%2Fmashable.com%2Fwp-content%2Fgallery%2F20-amazing-3d-printed-gifts%2F3DGFTR6.jpg or even for the tv