#robotics Logs

Sep 30 2017

12:00 AM Tom_L: no
12:05 AM Tom_L: i tried but did better etching
12:05 AM rue_shop3: hmmm
12:05 AM Tom_L: waste of good cutters
12:05 AM rue_shop3: hmm
12:05 AM Tom_L: high rpm and moderate feed
12:05 AM rue_shop3: witht eh ~8k limit on the sherline, I'm not sure, 40mm/min?
12:05 AM rue_shop3: 60?
12:05 AM Tom_L: 5k limit
12:05 AM rue_shop3: 5k!
12:05 AM Tom_L: with the 'high speed' pulley
12:05 AM Tom_L: on a stock sherline yes
12:05 AM rue_shop3: ah, yea
12:05 AM rue_shop3: k, must be my old one that tops out 8k
12:06 AM rue_shop3: 3.75k at 9mm/min
12:06 AM rue_shop3: !?! ouch
12:09 AM Tom_L: what's that in inches? slow?
12:10 AM rue_shop3: units 9mm/min inch/min
12:10 AM rue_shop3: * 0.35433071
12:10 AM rue_shop3: 12 passes
12:10 AM rue_shop3: bah, give it the night
12:11 AM Tom_L: i milled those things for kat
12:11 AM Tom_L: for her motor thing she was making
12:12 AM Tom_L: lemme look
12:13 AM Tom_L: how many read write cycles is a bios good for?
12:15 AM Tom_L: holes were S2800 F5.6
12:17 AM Tom_L: guess i turned them round on the lathe
12:17 AM Tom_L: didn't really mill any slots, just drilled holes
12:26 AM rue_shop3: 10 atleast
12:26 AM rue_shop3: 10k
12:26 AM rue_shop3: I'm using 10mm/min at full speed
12:26 AM rue_shop3: its a short bit
12:27 AM rue_shop3: not the one I used the pendant to mash into the fr-4 and break off, but the bit that replaced it
12:27 AM rue_shop3: the machine must bow a bit when there is load on it, it should have just driven the bit straight into the board
12:37 AM rue_shop3: according to a random internet document, I might be able to do 28mm/min
12:53 AM rue_ is now known as rue_house
12:53 AM rue_house: ok, there are 2 cnc machines and a 3d printer going in the shop
12:53 AM rue_house: #define __NOISY
01:25 AM rue_shop3: nothing on fire...
01:45 AM rue_shop3: anyone ever had to deal with the volocity instability of a chain?
01:46 AM rue_shop3: aka, the variation in output velocity as the links hit the sprocket?
03:11 AM mrdata: that seems finickey
03:11 AM mrdata: why cannot this be ignored?
03:51 AM Jak_o_Shadows: shove a flywheel on it?
03:51 AM Jak_o_Shadows: also, going to have to rethink the quadrapod.
03:52 AM Jak_o_Shadows: The leg configuration has too much slop with the joints I am using to use it the way I currently was planning
03:52 AM Jak_o_Shadows: If i move it the other way, I don't think it has enough joint range
05:23 AM Jak_o_Shadows: orrrrr, I just do it properly and it does vaguely work
05:24 AM Jak_o_Shadows: enough to try to pick up some M3x50 bolts\
07:43 AM drekipus: rue_shop3, use a tension pinion?
07:44 AM drekipus: ie: https://i.pinimg.com/736x/74/77/49/747749096c07e1d2d2065dd308be39e6--chains-black.jpg
12:54 PM rue_shop3: no, the speed of any sprocket must varry a little as the links step up to it
12:55 PM rue_shop3: linear approximation of a circle and all
12:55 PM rue_shop3: Tom_L, after the cnc running all night, I pulled out the pcb before I noticed that it didn't cut all the way thru :/
12:57 PM rue_shop3: there were other errors tho, like the tabs being 3mm high when the material is only 1.75
12:59 PM rue_shop3: https://guide.alibaba.com/shop/iron-cast-cnc-engraving-machine-frame-3030-cnc-diy-ball-screw-linear-slider-cutting-metal-engraving-machine-300x300x80mm_6020528.html
12:59 PM rue_shop3: wow
12:59 PM rue_shop3: I dont know what more wow, the fact its cast iron or the price
01:00 PM rue_shop3: https://guide.alibaba.com/shop/milling008-cast-iron-frame-customized-metal-vertical-milling-cnc-machine-bed-metal-engraving-3-axis-330x180x280mm-diy-mach3_6038374.html
01:00 PM rue_shop3: isn't that cheaper than a sherline?
02:40 PM pennywise is now known as davr0s
03:49 PM Tom_L: rue_house, no
03:49 PM Tom_L: the first one might be
05:53 PM sparrowsword: Hello! Was wondering if anyone had an idea on where to get a machine that could paste sticky notes to a wall up to 7ft high and as low as a 1/2 ft
05:58 PM deshipu: from the future
05:59 PM sparrowsword: deshipu: The future is now
06:00 PM deshipu: sparrowsword: nah, that's the past already
06:01 PM sparrowsword: deshipu: True, but there is still so much more
06:01 PM sparrowsword: is it possible to get something like this to have that level of percision? To be able to grab 1 sticky note in a stack? https://www.aliexpress.com/item/Humanoid-Robot-Leather-Boxing-Gloves-with-Fighting-Robot-Hand-with-Servos/32805721037.html?spm=2114.search0104.3.149.a7F4W9&ws_ab_test=searchweb0_0,searchweb201602_5_5460015_10152_10065_10151_10130_10068_10344_5560015_10342_10343_10340_10341
06:01 PM sparrowsword: _5470015_10307_10137_10060_10155_10154_10056_10055_10054_5370015_10059_10534_10533_10532_100031_10099_10338_9915_10339_5380015_5580015_10103_10102_10052_10053_10050_10107_10142_10051_10324_10325_10326_10084_513_10083_10080_10082_10081_10178_10110_5590015_10111_10112_10113_10114_143_10312_10313_10314_5570015_10078_10079_10073_5550015-9915,searchweb201603_17,ppcSwitch_2&btsid=ca72a422-2dbf-44
06:01 PM sparrowsword: bd-90f6-052845748811&algo_expid=b003afb5-e811-42c5-86c5-8946ffd81dc5-19&algo_pvid=b003afb5-e811-42c5-86c5-8946ffd81dc5
06:01 PM sparrowsword: Sorry the long url... didnt notice..
06:09 PM deshipu: what's your budget?
06:12 PM sparrowsword: deshipu: lets pretend it doesnt matter
06:13 PM sparrowsword: exist*
06:14 PM sparrowsword: no limit*
06:22 PM deshipu: oh, then get one of those satellite repair arms from NASA
06:22 PM deshipu: they should be fine
06:23 PM veverak: lol :):)
06:36 PM sparrowsword: if nasa was real..
06:39 PM sparrowsword: truth is first confronted with ridicule, and eventually understood
07:04 PM deshipu: truth being that you have no budget for this at all, not to mention other required specs
07:21 PM jason__: You could probably design a custom gripper just for sticky notes. It doesn't need to be a robotic arm.
07:24 PM deshipu: no, that would involve work
07:26 PM veverak: deshipu: have you access to academic papers?
07:29 PM deshipu: veverak: only to the publicly available ones
07:29 PM deshipu: (have you got)
07:30 PM veverak: hmm
07:30 PM veverak: this one seems nonpublic
07:31 PM deshipu: liberate it :)
07:31 PM veverak: well
07:31 PM veverak: scihub disagrees :)
07:31 PM veverak: deshipu: more on 'q'
07:31 PM veverak: deshipu: anyway, found really cool motion planing algorithm
07:31 PM veverak: same mechanics as what I thought about, slightly different implementation
07:32 PM veverak: but hey, it does what it should and it's awesome
07:32 PM veverak: deshipu: I think you could be interested
07:32 PM deshipu: yeah, thanks, I will probably get back to my robots some time next year
07:32 PM deshipu: when I finish with pewpew
07:33 PM veverak: building lazors ?
07:34 PM deshipu: tiny handheld game consoles programmable in python
07:36 PM veverak: sounds cool
07:36 PM deshipu: yeah, I'm on my 20th or so prototype
07:37 PM deshipu: got the "lite" version on sale already https://www.tindie.com/products/deshipu/pewpew-lite-featherwing/
07:41 PM deshipu: now working on a standalone one with more colors and sound
07:56 PM veverak: !! :)