#robotics Logs

Nov 14 2017

12:17 AM z64555: maybe try gator-clipping the L and C together instead of using the breadboard?
12:20 AM z64555: can also try making a jumper between the L and C so they don't use adjacent rails
12:20 AM z64555: and maybe ground those rails inbetween, too
03:02 AM Jak_o_Shadows: I need to do a more intelligent debouncing routine.
03:03 AM Jak_o_Shadows: at the moment I'm just delaying some time
07:10 AM rue_bed: I got you one
07:10 AM rue_bed: sand by
07:12 AM * z64555 sands down a rough patch
07:21 AM * robotustra scrape a metal plate
07:30 AM * SpeedEvil reams into the void.
07:55 AM rue_bed: looks like I didn't post the pendant stuff
07:56 AM rue_bed: made a new generic debounce
07:56 AM rue_bed: based on a linear ramping and threshold
07:56 AM rue_bed: I'll post
10:05 AM anonnumberanon is now known as logstaren
01:04 PM Phreaked: anyone still tinkering with a Rovio these days?
01:13 PM logstaren: nowadays it is the name of the game maker that made angry birds so maybe be more specific?
01:14 PM logstaren: ok nevermind i searched rovio robot and found something
01:15 PM Phreaked: well wouldnt be asking about rovio games here to be fair
01:16 PM logstaren: granted
01:16 PM durrf: my robot plays angry birds
01:26 PM robotustra: my robots play different games
08:33 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Stepper_mounts.jpg
08:33 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Z_Axis_Pulleys.jpg
08:34 PM Tom_L: rue_mohr, that's likely what i'll do on Z
08:34 PM Tom_L: and maybe have you print a cover for it
08:54 PM robotustra: that's what I have on mine
08:54 PM robotustra: but I did 1:#
08:54 PM robotustra: but I did 1:3
08:54 PM robotustra: Tom_L, where do you usually get pulleys?
09:13 PM Tom_L: sdp-si
09:14 PM Tom_L: mcmaster has some but not as many
09:14 PM Tom_L: these are XL series
09:14 PM Tom_L: i would have preferred a round belt tooth series but couldn't find what i was looking for
09:14 PM Tom_L: GT or HTD
09:17 PM robotustra: ok, I also got mine pulleys on sdp-si, I use GT2
09:18 PM Tom_L: what size shaft?
09:18 PM Tom_L: mine are 3/8 and 10mm
09:18 PM Tom_L: my sherline has GT2 on it
09:19 PM robotustra: https://www.youtube.com/watch?v=ISAjfiUgSt4&t=27s
09:20 PM robotustra: I got initially 1/4 I think, but I asked to drill bigger hole in it
09:20 PM Tom_L: looks like a nema17
09:20 PM robotustra: it is
09:21 PM Tom_L: is that a printer?
09:21 PM robotustra: no, cnc mill
09:21 PM Tom_L: k
09:21 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/StepperMount3.jpg
09:21 PM robotustra: nema17, 1:3 reduction, 1/2-10 ACME
09:21 PM Tom_L: my stepper's a little bigger
09:22 PM Tom_L: triple stack nema23 witha 3/8" shaft
09:22 PM robotustra: I didn't make fast mill, I was trying to make more less precise mill
09:22 PM robotustra: for cnc I'll use nema23
09:23 PM robotustra: but also 1:2 reduction
09:23 PM Tom_L: what size screws?
09:23 PM robotustra: 16mm ball screw
09:23 PM Tom_L: so 5mm pitch
09:23 PM robotustra: yes
09:23 PM Tom_L: same as what i'm looking at
09:23 PM robotustra: it looks ok in hands
09:23 PM Tom_L: square or round rails?
09:24 PM robotustra: square
09:24 PM Tom_L: i'm getting square rails
09:24 PM Tom_L: what lengths did you get?
09:24 PM robotustra: for the lathe z axis 500 mm and for X axis 250 mm
09:25 PM Tom_L: ideally i'm looking at 400 500 and 700mm
09:25 PM robotustra: https://imgur.com/nc1oTls
09:26 PM Tom_L: how wide are those?
09:26 PM Tom_L: 25mm?
09:26 PM robotustra: yes
09:26 PM Tom_L: i'm looking at 20mm
09:26 PM robotustra: no, 20 mm
09:26 PM Tom_L: do they look decent?
09:26 PM robotustra: they are rock solid
09:27 PM Tom_L: by that pic, my cad models don't look the same
09:27 PM robotustra: that's why I'm going to scrape plates
09:27 PM Tom_L: so i'd better wait for parts in hand
09:27 PM Tom_L: before making too much stuff
09:27 PM robotustra: they are thick
09:28 PM robotustra: 18 mm of height
09:29 PM Tom_L: can you tell me what the hole centers are on each pad?
09:29 PM Tom_L: maybe you got a different slide block than what i'm looking at too
09:30 PM Tom_L: they look wider
09:31 PM robotustra: 40x53 mm
09:31 PM robotustra: this one are HGW20cc
09:32 PM Tom_L: yeah, W
09:32 PM Tom_L: mine are more like HGH HA
09:32 PM Tom_L: i think
09:33 PM robotustra: I think that pads might be different
09:33 PM robotustra: depending on the strength
09:33 PM Tom_L: 1.969 x 1.260" between centers
09:34 PM rue_shop3: "we used radioactive mercury cause it was cheap. ... well, they paid us to take it..."
09:35 PM robotustra: mine are bigger
09:35 PM rue_shop3: its still not a size competition
09:35 PM robotustra: we are not compete
09:35 PM robotustra: we are not competing
09:36 PM Tom_L: i asked him to measure his rails
09:36 PM robotustra: just discussing the models of rails
09:36 PM rue_shop3: I dont speak russian, russian speak you
09:36 PM * Tom_L smacks rue_shop3 with a clue stick
09:36 PM rue_shop3: oh I dont care, I'm just randomly interjecting
09:37 PM Tom_L: i don't care that you don't care so there
09:37 PM Tom_L: :)
09:37 PM robotustra: it means HGW20CC has bigger distances between holes
09:37 PM rue_shop3: I'm still trying to find an oscillator for my current detector
09:37 PM Tom_L: what about your past detector?
09:37 PM robotustra: take a pendulum
09:37 PM robotustra: if you don't care
09:38 PM rue_shop3: I need somthng that goes directly from 0-1A to freq
09:38 PM robotustra: or you can take blocking generator
09:38 PM Tom_L: robotustra i'd bet the distance along the rail is the same hole pattern
09:38 PM Tom_L: yours are just wider
09:39 PM Tom_L: in fact i have those models too
09:40 PM rue_shop3: http://www.oddmix.com/tech/px/hv_dc_dc_60v_converter_f1.gif OH CMON, PLEASE TELL ME YOU SEE THE ERROR
09:40 PM * rue_shop3 bashes his head on the table
09:40 PM robotustra: I'm scraping the second day steel plate 4x4"
09:40 PM rue_shop3: WHY INTERNET!!!! WHYYYYYYYY
09:40 PM robotustra: trying to make it flat
09:40 PM Tom_L: using machinist blue?
09:41 PM * rue_shop3 throws down a sharpie
09:41 PM Tom_L: not the same in this case
09:41 PM Tom_L: there's dykem and machinist blue
09:41 PM Tom_L: the blue is more a paste
09:41 PM Tom_L: that doesn't really dry out
09:42 PM rue_shop3: so the sharpie is better?
09:42 PM robotustra: yes, but lamp black
09:42 PM robotustra: and granite surface plate
09:42 PM * rue_shop3 rubs a mirror against the granite table to see whos flat
09:42 PM robotustra: lamp black works good
09:43 PM Tom_L: you say yours were 40 x 53mm?
09:43 PM Tom_L: yeah, i just loaded that model and checked it
09:44 PM Tom_L: so i feel better these models are accurate
09:45 PM robotustra: https://imgur.com/BeWGVpm
09:45 PM robotustra: may be 2 more hours and it will be good
09:46 PM robotustra: it's already less than 0.02mm of unevenness
09:47 PM robotustra: 20 microns
09:47 PM robotustra: less than 20 microns
09:47 PM robotustra: I don't want to make it optical flat but...
09:48 PM robotustra: 25 spots per square inch whould be nice
09:48 PM rue_shop3: 3d printers, I realsized that mirrors have to be pretty flat or ya see wooble
09:49 PM * rue_shop3 tires to recap his goals here
09:50 PM rue_shop3: using a minimal parts count, the goal is to make a switching current controller 0-1A that is adjustable via a serial interface
09:51 PM rue_shop3: what about a slow serial dac
09:53 PM Tom_L: robotustra what's that part for?
09:53 PM Tom_L: and what tool are you scraping with?
09:53 PM Tom_L: a sharpened file?
09:56 PM Tom_L: new ff is different
09:57 PM Tom_L: just forced an update when it started
11:01 PM rue_shop3: ok, I just made a SIP10 R-2R ladder, most horrid smt mess ever
11:12 PM mrdata__ is now known as mrdata
11:14 PM rue_shop3: yay, my R-2R works
11:14 PM rue_shop3: NOBODY makes a thick film R-2R for less than a DAC chip
11:14 PM rue_shop3: WTF?!
11:16 PM rue_shop3: there should be laser trimmed R-2R thick film sips for like 5c ea
11:22 PM logstaren: https://www.youtube.com/watch?time_continue=12&v=ayT6tHJ7sn4
11:22 PM rue_shop3: hahaha
11:22 PM rue_shop3: who would suspect
11:55 PM rue_shop3: oh I know I'm on a spree when aliexpress hits me with a captcha