#robotics Logs

Sep 03 2018

12:00 AM orlock: default route goes out the "Outside" interface
12:04 AM orlock: and essentially you can only terminate VPN's on the interface that has the route to the other VPN endpoint on it
12:04 AM zhanx: rue_shop4, i might do that
12:04 AM rue_shop4: got the plate off the head without crushing my fingers!
12:04 AM zhanx: have done it before
12:09 AM rue_shop4: Tom_L, how do you usually cut square hss tool steel lengths?
12:17 AM zhanx: fuck it
12:17 AM zhanx: deleted it
12:18 AM zhanx: no i get to start over fresh
12:19 AM zhanx: opencv is a pita
01:07 AM rue_shop4: ok, hours of machining later
01:08 AM rue_shop4: huh
01:08 AM rue_shop4: the ream overdid it by about .09mm
01:08 AM zhanx: rue_shop4, i am playinh
01:08 AM rue_shop4: :)
01:08 AM zhanx: scanned my leg
01:09 AM rue_shop4: you can use inkscape to vectorize it
01:09 AM rue_shop4: remember to scan in a scale ref
01:09 AM zhanx: can? did
01:09 AM zhanx: custom knee brace
01:10 AM zhanx: might let me run again\
01:10 AM zhanx: doubt it
01:10 AM rue_shop4: :/ I thought you meant the robot leg
01:10 AM zhanx: i need to run to make then, i think better
01:11 AM zhanx: besides a scan of my leg is not too far off a robot leg
01:41 AM rue_shop4: Tom_L, your really good at the "pin the supplier and datasheets" thing, can you give it a try for metric E clips?
01:47 AM rue_shop4: ... oh, thats why they dont use E clips...
02:03 AM rue_shop4: hahahahahaha
02:03 AM rue_shop4: oooh damnit
02:03 AM rue_shop4: I'v spent almost the whole night working on making an encoder for my freq gen
02:04 AM rue_shop4: (and other stuff) and I forgot that the freq gen needs the "push-enter" functionality
02:27 AM rue_: I'm going to stop work on this for an undetermined period of time, but
02:27 AM rue_: http://ruemohr.org/~ircjunk/projects/siggen/p1100642.jpg
02:27 AM rue_: http://ruemohr.org/~ircjunk/projects/siggen/p1100643.jpg
02:27 AM rue_: http://ruemohr.org/~ircjunk/projects/siggen/p1100644.jpg
02:27 AM rue_: thats where I got to
02:28 AM rue_: I'm trying to figure out how to make a drum style solution work
02:28 AM rue_: I have a 3d printed backbox for it too
02:29 AM rue_: this one is low-rez, high-friction for hand use
02:30 AM rue_: most of the design has been with bearings and stuff for high-speed low-friction machine use
02:30 AM rue_: apparently my newest 3d printer has backlash somewhere, and I cant find it
02:31 AM rue_: I suspected the gearboxes, but their fine
06:35 AM Tom_L: rue_, A: mine are usually the right length but i would cut them with an angle grinder cutoff wheel cooling it as i go.
06:35 AM Tom_L: B: http://www.marshallshardware.com/products/productList.aspx?uid=2-442-449
06:36 AM Tom_L: C: if a reamer is oversize hone the edge a little bit
06:37 AM Tom_L: you only get 28 questions. that's all the letters there are
06:57 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/encoder_wheel_15.jpg
06:57 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/encoder_wheel_20.jpg
07:01 AM Tom_L: nice job on the encoders btw
12:51 PM rue_bed: the ones I got from china are 20cm long
12:51 PM rue_bed: thanks, its a bit of progress for now
12:52 PM rue_bed: it could have been ball bearing too, I have the stuff
12:52 PM rue_bed: 11am, hmm
03:03 PM Tom_L: rue_shop3
03:03 PM Tom_L: would the round holes work like the pics?
04:24 PM rue_shop4: not sure
04:41 PM _unreal_: Starting to get my motor controller box put together
05:17 PM rue_shop3: heh, thats somehting I love about the new white leds
05:17 PM rue_shop3: 0.16mA for the power light on my battery powered project
05:17 PM rue_shop3: and I could have gone lower
05:18 PM rue_shop3: at 0.064mA I still get good light
05:42 PM Tom_L: rue_shop3, got some dimensions for them? i might try to make a couple
05:43 PM rue_shop3: well, dia is 20mm
05:43 PM rue_shop3: shaft is 5mm
05:44 PM rue_shop3: hole count is between 12 and 60
05:44 PM Tom_L: oh, i thought you said the shaft was 7mm
05:44 PM rue_shop3: the OD of the bearings is 7mm
05:44 PM rue_shop3: the shaft is 5mm, yesterday I made a bearingless one with 6mm shaft
05:44 PM rue_shop3: but its steel-steel bushing/shaft and isn't really that happy
05:45 PM Tom_L: you got reamers for the hole?
05:45 PM rue_shop3: but the ream overcut by like .09mm, so I had to knock it with a punch in a few spots to get the play out
05:45 PM Tom_L: i can leave them small and you can make them fit then
05:45 PM rue_shop3: for the bushing I used a ream
05:45 PM Tom_L: take a hone to the reamer
05:45 PM rue_shop3: it dosn't have to be close
05:45 PM rue_shop3: well, I put the ream in the lathe
05:45 PM Tom_L: one sec...
05:45 PM Tom_L: pulling up the model
05:45 PM rue_shop3: and the tailstock alignment is out
05:46 PM rue_shop3: so it overcut
05:46 PM Tom_L: so the hole is 5mm?
05:46 PM rue_shop3: in the disc, yes
05:46 PM Tom_L: what was the disk od?
05:46 PM rue_shop3: 20mm
05:47 PM Tom_L: and the shoulder od?
05:48 PM rue_shop3: not too important, I used like 8mm
05:48 PM rue_shop3: I'm press-fit / glueing them on
05:48 PM Tom_L: disk thickness?
05:50 PM Tom_L: and overall thickness on shoulder
05:57 PM Tom_L: i could make slots if you think the holes may not work
05:58 PM Tom_L: just lookin for a small project until i come up with something here...
06:03 PM Tom_L: is .125 alum thick enough for the shoulder?
06:03 PM Tom_L: with .0625 disk
07:07 PM rue_shop3: sorry, digging potatoes!
07:07 PM rue_shop3: thickness is mechanically stable & able to block IR light
07:07 PM rue_shop3: my overall thickness was 5mm
07:08 PM rue_shop3: those numbers sound fine
07:08 PM Tom_L: what's that in my language ? :)
07:08 PM Tom_L: are . 62 holes big enough?
07:08 PM Tom_L: .062
07:09 PM rue_shop3: whatever fits on the radius of them, I try to make the duty 50%
07:09 PM Tom_L: i could slot if you think it needs it
07:10 PM Tom_L: i got lots of 1/8" sheet
07:11 PM Tom_L: so a little less than 5mm
07:11 PM Tom_L: maybe that's not thick enough
07:20 PM rue_shop3: it just has to block the IR light
07:20 PM rue_shop3: it can be crazy glued to the shaft if need be
07:21 PM Tom_L: .125 ok then?
07:21 PM Tom_L: it should press on i hope
07:22 PM Tom_L: you got plenty of 5mm shaft?
07:22 PM Tom_L: is that the target we're shooting for?
07:22 PM orlock: fnnaaar
07:31 PM rue_shop3: I have a bunch
07:31 PM rue_shop3: and, if I need, I can use 6mm and turn the end down
07:32 PM Tom_L: i suppose you can drill out the holes if they're not big enough
07:32 PM Tom_L: the 'slots'
07:32 PM Tom_L: or would you rather have slots instead of holes
07:32 PM * orlock has been making up a bracket to fix an vape
07:32 PM Tom_L: i figured .062" holes
07:32 PM orlock: it has the most stupid fucking design flaw
07:32 PM Tom_L: that might be kinda limiting
07:33 PM orlock: the button is designed to fail after not much use
07:33 PM orlock: PCB mount button soldered perpendicular to the PCB with no support
07:33 PM rue_shop4: oof
07:33 PM orlock: so after a few pushes, the legs bend
07:33 PM orlock: and the whole case is a press-fit metal tube
07:34 PM orlock: had to dremel it into 2 parts
07:34 PM orlock: i'm printing a sleeve to hold the 2 parts in place, and it will also hold a real button
07:35 PM orlock: https://cdn.shopify.com/s/files/1/2696/1706/products/smok_stick_v8_kit_27_480x480.jpg?v=1515511276
07:36 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/encoder_wheel_slot.jpg
07:36 PM Tom_L: better?
07:39 PM rue_shop4: if you want, you can pull them closet to the edge
07:39 PM Tom_L: i moved the slots a little closer to the edge than that pic shows
07:39 PM Tom_L: :D
07:40 PM rue_shop4: :)
07:40 PM Tom_L: how close?
07:40 PM rue_shop4: it can be open, but the ring helps it mechanically
07:40 PM rue_shop4: so, thats looks good
07:40 PM Tom_L: yeah it needs to be closed
07:40 PM Tom_L: 15 slots
07:40 PM rue_shop4: ok
07:41 PM rue_shop4: I was fighting some lash in my printer, got from soemthing like 12 to 60
07:42 PM rue_shop4: I'd like to play with an EDM machine to cut the slots
07:42 PM Tom_L: the wall thickness is .027" from the outer radius of the slot to the edge
07:42 PM rue_shop4: whats fine mechanical pencil lead, 3mm?
07:42 PM Tom_L: hell if i know
07:42 PM orlock: < 1mm?
07:42 PM rue_shop4: normal is 5mm, thick is 7mm
07:42 PM rue_shop4: sorry
07:42 PM rue_shop4: 0.5mm and 0.7mm
07:42 PM Tom_L: edm can cut pretty fine
07:43 PM orlock: 0.3 i see too
07:43 PM rue_shop4: ok 0.3 is prolyl what I'm thinkin
07:43 PM rue_shop4: use that for EDM
07:43 PM rue_shop4: make an EDM cnc
07:43 PM rue_shop4: :)
07:43 PM orlock: Staedtler Fineliner
07:43 PM rue_shop4: I could use floppy sliders
07:44 PM Tom_L: ok pulling it into my cad cam
07:44 PM Tom_L: the slots i'm just gonna do a single slit with the endmill instead of a profile
07:45 PM rue_shop4: like to see your feed rate calc for that!