#robotics Logs

Sep 22 2018

12:03 AM flav0r: oh
12:07 AM flav0r: i just looked them up
12:07 AM flav0r: they just seemed cheaper
12:07 AM flav0r: but i dunno dude !
12:07 AM flav0r: shit i have a coupel orders fromt here that i paid extra for 12-20 day shipping
12:07 AM flav0r: one has been 37 days already!
12:07 AM flav0r: BRUTAL!!
12:07 AM flav0r: another is 30
12:22 AM Jak_o_Shadows: The only time I ever paid express, the same thing happened to me
12:23 AM flav0r: it was only a few dollars more
12:23 AM flav0r: but i would be annoyed if the same happened if i paid for fedex or dhl etc.
12:27 AM Jak_o_Shadows: oh, bloody hell, it worked
02:34 AM rue_mohr: can I glue videos togethor on yt?
02:53 AM flav0r: theres a chip i want to buy
02:53 AM flav0r: on digikey its about $6
02:53 AM flav0r: mouser about the same
02:53 AM flav0r: aliexpress i see it for about 30 cents!
02:54 AM flav0r: in one listing … other listings are about $3 to $4
02:54 AM flav0r: i WANT to go for the 30 cents
02:57 AM rue_mohr: no
02:57 AM rue_mohr: look at the feedback score
02:57 AM rue_mohr: the 30c one will be like 70%
02:57 AM rue_mohr: get the 3 or 4 ones and you will likley be ok
02:57 AM flav0r: or no fedback
02:58 AM flav0r: i think ill strike a balance and get the 10 for 13
02:58 AM flav0r: check this out
02:58 AM flav0r: http://cathodecorner.com/nwl/nwld-mod-top.jpg
02:58 AM flav0r: see the chip at the bottom of the pic
02:58 AM flav0r: got 1308B on it
02:59 AM flav0r: https://www.aliexpress.com/item/Free-shipping-10pcs-lot-LT1308BCS8-LT1308B-LT1308-1308B/32668967414.html
02:59 AM flav0r: look at that pic
02:59 AM flav0r: they look the same .. but curiously there appears to be a black dot drawn on the outside of the plastic
02:59 AM flav0r: covering the linear logo
03:00 AM flav0r: strange huh !
03:00 AM rue_mohr: no
03:00 AM rue_mohr: the dot is post-edit on the image
03:00 AM flav0r: well ok
03:00 AM flav0r: same thing
03:00 AM flav0r: lol
03:00 AM rue_mohr: they get in trouble if you can see the logo
03:00 AM flav0r: point is its not on the chip
03:00 AM flav0r: i didnt mean LITERALLY on the plastic
03:00 AM rue_mohr: so usually logos are blacked out
03:00 AM flav0r: i meant “on” the plastic
03:00 AM flav0r: yah thats what i was figuring
03:01 AM flav0r: or over the plastic
03:01 AM flav0r: you get the idea !
03:01 AM flav0r: ok man tyouve twisted my arm
03:01 AM rue_mohr: I can usually tell by the font, if nothing else, whos chip it is in the image
03:01 AM rue_mohr: not always what your sent tho
03:01 AM flav0r: well thats good too
03:01 AM flav0r: coz if its different … open dispute .. get refund!
03:02 AM flav0r: problem is i will need one sooner to tet
03:02 AM flav0r: test
03:02 AM flav0r: crushes my spirit to have to spend $6 on one to test from digikey
03:02 AM rue_mohr: its interesting how you get edge fringe differences in operation of something like a LM555 between the orig and the china knockoff
03:03 AM flav0r: dont put doubt in my mind
03:03 AM flav0r: i just ordered them!
03:03 AM rue_mohr: I was playing with the priority behaviour of a 555 between trigger, set and reset
03:04 AM flav0r: dude i will be using that 3d print this weekend to test hopefully
03:04 AM flav0r: if i meet that guy with the motor in question
03:04 AM flav0r: woot
03:04 AM rue_mohr: I wonder if I could design not-so-soft soft-robotics
03:04 AM flav0r: yeah dude
03:05 AM flav0r: put your mind to it
03:05 AM rue_mohr: that last url, feedback is 97.5% so ~
03:05 AM flav0r: hey were you the dude i talked to the first time i came here that made something with the VFD display from a VCR ?
03:05 AM rue_mohr: you have to accout for 1.5% to 3% stupid customers
03:05 AM rue_mohr: yea, I did a vfd hobby before anyone else on the internet
03:06 AM flav0r: nice
03:06 AM flav0r: i just gotta remember who people are so that i remember who to bug about it when i finally get to making something
03:07 AM flav0r: cool tho … i now can say i know the OG vfd guy on the internet
03:11 AM flav0r: oh man i finally figured otu what something was on this dudes schematic
03:11 AM flav0r: they look like a bunch of jumpers
03:11 AM flav0r: but i thought no way they are jumpers
03:12 AM flav0r: they are actually just double row headers .. that i thought didnt make sense either
03:12 AM flav0r: but he is using them to join individual boards
03:12 AM flav0r: was bamboozling for about 5 mins!
03:14 AM flav0r: i dunno about you dude but i find schematics that have lies going to every single component and every pin
03:14 AM flav0r: very distracting to read
03:14 AM flav0r: lines
03:16 AM flav0r: the fact that im looking at it sideways doesnt help either :)
03:16 AM flav0r: http://www.cathodecorner.com/nixiewatch/firmware/nwrg-schem.pdf
03:22 AM rue_shop4: those are busses
03:22 AM rue_shop4: you have to work out who is who comming out of the bus by the name
03:23 AM rue_shop4: it saves drawing a million lines
03:23 AM flav0r: no not the big bus lines
03:23 AM flav0r: just the little header looking things
03:24 AM flav0r: they confused me at first becuase the device doesnt have room for headers to be dotted around the place
03:25 AM flav0r: and also not too concerned about the busses because i wont be using those chips he uses … also wont be using that PIC
03:26 AM flav0r: im just concerned about his power circuit
03:37 AM rue_shop4: hmm, I'm going to have to be up at like 7:30am
03:37 AM flav0r: dude
03:37 AM flav0r: thats unfortunate
04:22 AM rue_mohr: na, unfortunate is that its almsto 2:30am now
04:23 AM Jak_o_Shadows: yeah.
04:24 AM Jak_o_Shadows: I am definitley not in the frame of mind to bother trying to get this STM module working, given the lack of documentation
04:24 AM rue_mohr: stm32?
04:40 AM Jak_o_Shadows: nah. That's the bit that's working (I think). It's a little distance sensor thingy
04:41 AM Jak_o_Shadows: Instead of releasing the register manual, they released an API
05:33 AM rue_mohr: quick check, does this link work?
05:33 AM rue_mohr: https://www.youtube.com/watch?v=dw5jW6wkrk0&feature=youtu.be
05:33 AM rue_mohr: youtube seems to be confused as to if its public or provate
05:39 AM Jak_o_Shadows: works for me
05:40 AM Jak_o_Shadows: and seems searchable as well
05:40 AM Jak_o_Shadows: so completley pubic
05:45 AM rue_mohr: yay thats what I set it to
06:03 AM Jak_o_Shadows: Is't it nice when things work
09:56 AM rue_mohr: --
08:03 PM rue_shop4: hmm I'm supposed to be making exponential progress,
08:03 PM rue_shop4: I think something went wrong with my exponent
08:04 PM Tom_L: trying to fix my cam for helix. not going so well
08:12 PM rue_shop3: yes, PMMA WILL conduct IR light
09:01 PM Tom_L: yay it works but not the conventional way
09:10 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/encoder/helix.jpg
09:10 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/encoder/helix.txt
10:11 PM rue_mohr: hmm
10:11 PM rue_mohr: Tom_L, so, those disks have a ~60-70% duty
10:12 PM rue_mohr: I'm not sure why yet
10:12 PM Tom_L: the narrow slot ones?
10:12 PM rue_mohr: it could be a few things
10:12 PM rue_mohr: I'm wondering if the beam of the opto is narrower than the slot
10:12 PM Tom_L: uneven triangle from the center out
10:12 PM Tom_L: next ones should fix that
10:12 PM rue_mohr: not sure
10:13 PM rue_mohr: but it works
10:13 PM rue_mohr: after lots of fiddling while not figuring out duties, I went back to the signal I landed on to start with that does have more than close enough to the 90 degree phase shift
10:14 PM rue_mohr: I hadn't thrown a schmitt at it, so, the duties could be fixed a bunch with the level sets
10:14 PM rue_mohr: and the PMMA would work too
10:15 PM Tom_L: i suspect the next ones should be closer
10:15 PM Tom_L: these stupid docs just don't give me enough information for this cam
10:15 PM rue_mohr: think on it tho, if the opto slot is narrower than the disc slot, you get duty error
10:16 PM rue_mohr: you programming a cam?
10:16 PM rue_mohr: 4th axis?
10:16 PM _unreal_: ordering more parts :)
10:16 PM Tom_L: not a 4th axis
10:16 PM Tom_L: i'm programming thread cutting with a single point cutter
10:17 PM Tom_L: ie thread mill
10:17 PM rue_mohr: inverse boring?
10:17 PM Tom_L: http://www.harveytool.com/prod/Thread-Milling-Cutters/Holemaking---Threading/Browse-Our-Products_271/Thread-Milling-Cutters---Single-Form_157.aspx
10:17 PM Tom_L: that's what they look like
10:17 PM rue_mohr: that exaplains the spiral
10:18 PM rue_mohr: hmm
10:18 PM Tom_L: not quite what you think at first
10:18 PM rue_mohr: does that account for the distortion?
10:18 PM Tom_L: yes
10:18 PM Tom_L: you get them for a small range of pitches
10:18 PM rue_mohr: yea, so its like gear cutting
10:18 PM Tom_L: sorta
10:19 PM _unreal_: just ordered my KEY lock switches, backup 2032 battery holders (for RTC for my tinker board. annoying it doesnt have clock), my fan grill
10:19 PM Tom_L: but since i can't use taps because of the motor hp i thought i might try this
10:19 PM _unreal_: some different types of SMD adapter boards :0
10:19 PM _unreal_: :)
10:19 PM _unreal_: to dip
10:19 PM Tom_L: i get those free
10:20 PM _unreal_: I get fiberglass products free all the time
10:20 PM _unreal_: AND tools :)
10:20 PM Tom_L: every time i ordered from ian he sends me stuff like that
10:21 PM _unreal_: ian?
10:22 PM Tom_L: i never can remember his website because when i was ordering from him he didn't have one yet
11:07 PM Tom_L: rue_mohr, so technically they can cut internal or external threads
11:10 PM rue_mohr: yea
11:13 PM Tom_L: it would be nice if they had a one size fits all one
11:20 PM rue_mohr: single point bit, you have to turn it to keep it 90 degrees to the surface being cut
11:21 PM Tom_L: these, the cutter spins just like any endmill
11:22 PM Tom_L: it just follows a helix path
11:43 PM rue_mohr: so they break it inot half-arcs to make sure the machine goes the right way?
11:43 PM rue_mohr: into