#garfield Logs
Dec 12 2021
#garfield Calendar
12:06 AM rue_mohr: aandrew, did you have an interest in adapting that holder for 18650?
01:55 AM rue_shop2: ok I have a lot of parts
01:55 AM rue_shop2: I need to be making things
01:55 AM rue_shop2: I been so busy gathering parts I forgot what I wanted to make
11:03 AM rue_bed2: morning
11:03 AM Tom_L: morning
12:21 PM rue_mohr: https://pbs.twimg.com/media/FGZ9fjcUUAIKHlI?format=jpg&name=small
12:31 PM Tom_L: what is it?
12:32 PM Tom_L: or what is it for?
12:57 PM rue_mohr: not sure, its a neat machining job tho
12:58 PM rue_mohr: polprog, its IRQ sharing
12:58 PM Tom_L: pita to cut those teeth like that though
12:58 PM rue_mohr: the driver gets to work out who needs service when the interrupt happens
12:59 PM rue_mohr: Tom_L, I wonder how many bits were used
01:24 PM polprog: rue_mohr: yeah, it shared the irq with usb, that didnt end well
01:57 PM polprog: https://cdn.discordapp.com/attachments/739849787238776855/919672893212872834/IMG_20211212_203129.jpg
01:57 PM polprog: I made a 3d model
01:57 PM polprog: GOnna make a key and buttons panel for my PC
02:01 PM Tom_L: printed?
02:02 PM rue_mohr: heh
02:02 PM rue_mohr: I need a usb one
02:08 PM Tom_L: i need a usb cable with heavy wires
02:08 PM Tom_L: just need the power
02:08 PM Tom_L: i keep breaking the wires off
02:17 PM polprog: trying to make my friend print one for me
02:20 PM rue_mohr: warp control on that is hard
02:31 PM polprog: it's an experiment anyways
02:31 PM polprog: What would you do to prevent it?
02:44 PM rue_mohr: I'd avoid a full plate print for the front
02:44 PM rue_mohr: I might make the actual front an aluminum plate, and use the 3d print to make a frame behind it
03:18 PM polprog: Hard to work aluminum for me
03:18 PM polprog: ill see if it works
03:19 PM polprog: My second 3d print design ever
03:37 PM polprog: Hmm i might build a 555 circuit for the first time
03:37 PM polprog: I need a monostable multivib
03:38 PM polprog: So that when i turn the keyswitch to the RUN position it sends a ca. 0.5 sec pulse across the power button input
03:38 PM polprog: And then another one for the RESET position
03:39 PM polprog: And preferably one that sends a 3s long power button push on a RUN->HALT transition
04:03 PM Tom_L: i say machine it from a solid block of aluminum :D
04:27 PM rue_mohr: wont work, monostables stuck
04:27 PM rue_mohr: if your trigger pulse is shorter than the output pulse your ok
04:27 PM rue_mohr: I used to hate that they dont illude to this properly
04:28 PM rue_mohr: you need an edge triggered one, non retriggerable
04:28 PM rue_mohr: the world does not like non-retriggerable monostables
04:28 PM rue_mohr: did you see the circuit I posted for a non-retriggerable latley?
04:46 PM polprog: no
04:47 PM polprog: I actually managed to achieve it... with a series capacitor
04:47 PM polprog: https://twitter.com/polprogpl/status/1470155844033687552
04:47 PM polprog: of all the things
04:47 PM rue_mohr: yea, that would do it
07:27 PM Tom_L: done any casting lately?
07:34 PM rue_mohr: hell no, too wet/cold
07:34 PM rue_mohr: do you know if there is a way of mirroring a template for casting?
07:35 PM rue_mohr: the ony thing I can think of is to do a thin thermoform if the template and use the other side of it to make a mold
07:39 PM Tom_L: mirroring?
07:39 PM Tom_L: in cad you can
07:39 PM Tom_L: invert 1 axis
07:40 PM Tom_L: if you had a file i can mirror it
07:43 PM rue_mohr: no its already made
07:43 PM rue_mohr: I didn't make it
07:43 PM rue_mohr: ma wants a reversed casting
08:06 PM Tom_L: oh
09:25 PM rue_mohr: hmm
09:25 PM Tom_L: i'm not sure how you would go about that
09:26 PM Tom_L: a left and a right?
09:26 PM Tom_L: or an inside and an outside?
09:26 PM rue_mohr: hey I'm pondering an inline pneumatic valve
09:26 PM rue_mohr: the casting, mirrored, in any fassion
09:26 PM rue_mohr: but the pneumatic valve would need some steel parts...
09:26 PM rue_mohr: or..
09:26 PM rue_mohr: hmm
09:27 PM Tom_L: mechanical or electrical?
09:27 PM Tom_L: ball valve
09:27 PM Tom_L: slide valve
09:27 PM rue_mohr: electrical
09:27 PM rue_mohr: but
09:27 PM Tom_L: rotary valve
09:28 PM rue_mohr: inline pipe
09:28 PM Tom_L: washer valve
09:28 PM Tom_L: you collected a bunch of those
09:28 PM rue_mohr: I cant get enough
09:28 PM rue_mohr: so I was pondering
09:28 PM rue_mohr: here is what I came up with
09:28 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1220173.jpg
09:29 PM rue_mohr: steel ball in a section of plastic pipe
09:29 PM rue_mohr: rests against a seal to block flow
09:29 PM rue_mohr: but its close to a magnetic block
09:29 PM Tom_L: flapper valve
09:29 PM rue_mohr: with a coil around the outside of the pipe
09:30 PM rue_mohr: coil triggers, ball is pulled against magnetic block
09:30 PM Tom_L: unreliable
09:30 PM Tom_L: not enough force from the coil
09:30 PM rue_mohr: block needs to press into the pipe, and let air past
09:30 PM rue_mohr: if its pulling up against that block, there can be a LOT of force
09:31 PM Tom_L: you would need a release spring on the ball too
09:31 PM Tom_L: so it didn't get stuck
09:31 PM rue_mohr: for 1/4" pipe and 80 psi I need 1.8kg
09:31 PM Tom_L: 80psi plastic would be schedule 40 at least
09:31 PM rue_mohr: er,
09:31 PM rue_mohr: the clear soft stuff
09:31 PM rue_mohr: ?
09:32 PM Tom_L: 80psi would balloon that
09:32 PM rue_mohr: hmm 1/2" clear pvc?
09:32 PM Tom_L: T slide valve
09:33 PM rue_mohr: high speed?
09:33 PM Tom_L: similar to a plumbing gate valve
09:33 PM Tom_L: only flat not wedged
09:33 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/61K+5zUV1bL._AC_SL1500_.jpg
09:33 PM rue_mohr: I all sorts of tolerance isues
09:33 PM rue_mohr: this inline thing should be forgiving
09:34 PM rue_mohr: I'm using that tube anyhow, i wonder
09:34 PM rue_mohr: at 1/4" you dont think it'll hold?
09:34 PM rue_mohr: I think 80
09:35 PM rue_mohr: oh
09:35 PM rue_mohr: diagram says 60 not 80
09:35 PM Tom_L: https://www.amazon.com/4inch-Normally-Closed-Electric-Solenoid/dp/B074Z5SDG3/ref=sr_1_18?keywords=1%2F4+air+valve&qid=1639365594&sr=8-18
09:35 PM Tom_L: make something like that
09:35 PM rue_mohr: tried
09:35 PM rue_mohr: cant
09:36 PM rue_mohr: cant seal them, never works
09:36 PM Tom_L: sprinkler valves
09:36 PM Tom_L: 24v typical
09:36 PM rue_mohr: I need 188 valves
09:36 PM Tom_L: why?
09:36 PM rue_mohr: that many pneumatic muscles
09:37 PM rue_mohr: its a crazy project
09:37 PM Tom_L: i thought you had that figured out once
09:37 PM rue_mohr: I was doing good till they stopped making suitable washing machine valves and I couldn't get them anymore
09:37 PM rue_mohr: I have like 20?
09:37 PM Tom_L: scale your projects to within reason or they will never be completed
09:40 PM rue_mohr: I did
09:40 PM rue_mohr: any smaller and I cant make it
09:41 PM rue_mohr: I think this inline is easy to make and might work
09:41 PM rue_mohr: if I can make that steel/ferrite insert
09:41 PM rue_mohr: I need to doublecheck the tube I'm using tho
09:42 PM rue_mohr: I dont know if I'v ever had it up to 60 for prolonged time periods
09:42 PM Tom_L: that plastic tube you linked won't take 80 psi
09:42 PM rue_mohr: yea its 60, I need to redo my math
09:42 PM Tom_L: has no reinforcing webbing
09:42 PM rue_mohr: I bet I'm 80/60ths over
09:44 PM Tom_L: you got too many and i got none currently
09:47 PM rue_mohr: if only I had a way to shave grooves down the side of a bar to make an extruded *
09:47 PM rue_mohr: or +
09:47 PM Tom_L: slitting saw
09:47 PM rue_mohr: not sure I could just use rectangular material
09:47 PM Tom_L: like the one i used on the trigger thing
09:47 PM rue_mohr: this is pretty small, friction fit into a 1/4" ID pipe
09:47 PM Tom_L: keyslot cutter
09:48 PM rue_mohr: I should make some kinda dividing arrangement for my lathe
09:49 PM rue_mohr: I'd need some ferrous bearing balls
09:49 PM rue_mohr: not sure if the regular ones I ahve are or not
09:49 PM Tom_L: https://www.revingtontr.com/productimages/linked/KentDisc1.jpg
09:50 PM Tom_L: those are about 8-10" diameter
09:50 PM rue_mohr: hmm, your right I dont need a stepped lock, just a brake
09:51 PM rue_mohr: almost a modified C clamp
09:51 PM rue_mohr: well I have an idea for a casting now!
09:51 PM rue_mohr: I should design the template while its in my head
09:51 PM Tom_L: it's too cold for that
09:52 PM rue_mohr: well, there are the occasional widnows I could possibly cast something
09:52 PM rue_mohr: tho the BBQ tank freezes up easy
09:52 PM Tom_L: the coarse setting on my rotary is 10 clicks per degree on my penant
09:52 PM rue_mohr: :)
09:53 PM rue_mohr: hah, there is a project
09:53 PM Tom_L: next one is i think one round on the penant per degree if i remember correctly
09:53 PM rue_mohr: make a spline punch for a hobby servo!
09:54 PM rue_mohr: I did one on a lathe, but its specific to a servo that isn't what I have lots of
09:54 PM rue_mohr: I did it in regular steel, it should be drillrod & hardened
09:54 PM rue_mohr: never hardened drillrod :)
10:06 PM rue_shop2: huh, found a document that suggests, if this is pvc, its rated for 58psi
10:06 PM rue_shop2: 70F, not sure what temp that is
10:08 PM rue_shop2: pvc is definitly on the bottom of the pressure rating chart, ok
10:10 PM rue_shop2: ok, well I'm try to make a test vavle
10:12 PM rue_shop2: do a little test
10:12 PM rue_shop2: mayeb not all tonight
10:12 PM rue_shop2: almost bedtime
10:12 PM Tom_L: yup
10:12 PM Tom_L: closer here than there for that
10:13 PM Tom_L: slide valve with teflon seals
10:14 PM rue_shop2: I still cant make it
10:14 PM rue_shop2: I'v tried to make valves for like 15 years now
10:16 PM Tom_L: https://www.youtube.com/watch?v=tYRdLUvVeII
10:18 PM Tom_L: too complicated
10:19 PM rue_shop2: I'm not sure, I"m still watching the ads
10:19 PM Tom_L: i got no ads
10:19 PM Tom_L: ad blocker :)
10:21 PM rue_shop2: also, that many valve bases would kill the budget
10:21 PM rue_shop2: but I'm watching
10:21 PM Tom_L: don't waste your time
10:22 PM Tom_L: my google finger has some rust on it
10:23 PM rue_shop2: uh..
10:23 PM rue_shop2: how do these people get away with builing things like this and having them work!?
10:24 PM Tom_L: heh
10:24 PM rue_shop2: so its pressure compensated
10:25 PM rue_shop2: ...omh really is he....
10:25 PM rue_shop2: oh man
10:25 PM rue_shop2: I hope thats not for water
10:25 PM Tom_L: well, it is
10:25 PM rue_shop2: hahaha
10:26 PM rue_shop2: give it a week?
10:26 PM Tom_L: i skimmed thru it in about 10 sec and decided it was a bad post
10:27 PM Tom_L: i have seldom watched a yt from start to finish
10:27 PM rue_shop2: oh no, he did use it for water too
10:28 PM Tom_L: was looking at my video list today
10:28 PM rue_shop2: it must draw about 1000A
10:28 PM Tom_L: it surprises me which ones get the most views
10:28 PM rue_shop2: and the electolysis on the connections...
10:28 PM rue_shop2: yea
10:28 PM rue_shop2: mine dont get any
10:28 PM Tom_L: one has over 8k
10:28 PM Tom_L: another 3k
10:28 PM Tom_L: the rest are low
10:29 PM Tom_L: i can kinda see it on those though
10:29 PM Tom_L: they were topics alot of ppl want figured out
10:31 PM Tom_L: subscribers are growing slow too
10:31 PM Tom_L: i hardly ever check it
10:34 PM rue_shop2: cool tom, it triggers with a permanent magnet
10:34 PM Tom_L: what does?
10:34 PM rue_shop2: my test of this valve
10:34 PM Tom_L: yours?
10:34 PM rue_shop2: I'm just blowing on it tho
10:34 PM Tom_L: nice
10:34 PM rue_shop2: I'll take pics
10:34 PM Tom_L: i'm goin to bed
10:35 PM rue_shop2: no wait for the pics!
10:35 PM rue_shop2: I'll hurry
10:35 PM Tom_L: well then hurry up, i'm not getting younger ya know!
10:39 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1220174.jpg
10:39 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1220176.jpg
10:39 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1220177.jpg
10:39 PM rue_mohr: pretty simple eh?
10:39 PM rue_mohr: its a win if I can get the ball to pull out at 60 psi
10:39 PM rue_mohr: I'll play with coils later
10:39 PM Tom_L: what's that plastic inside?
10:40 PM rue_mohr: a peice of pipe that retains the ball
10:40 PM rue_mohr: and the sealing seat
10:40 PM Tom_L: from what?
10:40 PM rue_mohr: its that pipe that used to be used under kitchens for the taps
10:40 PM Tom_L: hmm
10:41 PM Tom_L: so you're planning to move the magnet with a coil around the tube?
10:41 PM rue_mohr: thats just a peice of steel
10:41 PM rue_mohr: I'll put a coil around the outside to pull the ball up against it
10:41 PM Tom_L: what keeps it attached to the ball?
10:42 PM rue_mohr: with a small gap like that, there should be lots of force on the ball
10:42 PM rue_mohr: magnetism
10:42 PM Tom_L: you said it wasn't a magnet
10:42 PM rue_mohr: around the outside of the pipe, a coil
10:42 PM Tom_L: right
10:42 PM rue_mohr: the field magnetizes the steel, pulls the ball up against it
10:43 PM rue_mohr: aka, off the seat
10:43 PM Tom_L: a magnet would do better since it would tend to force it tighter
10:43 PM rue_mohr: electromagnet tho
10:43 PM rue_mohr: this is for servo control of an air muscle
10:44 PM Tom_L: i know, i have some electromagnetic plungers
10:45 PM Tom_L: does the steel slide in the tube or just pull the ball?
10:45 PM rue_mohr: stays, just pulls
10:45 PM rue_mohr: its there to boost the field
10:45 PM Tom_L: make a * or + then
10:45 PM rue_mohr: yes
10:45 PM Tom_L: like you mentioned
10:45 PM rue_mohr: the bar was a quick grab
10:46 PM rue_mohr: I thought I had some square that would fit, but it was all just big enough to seal the tube
10:46 PM Tom_L: as long as you don't need alot of air volume thru it
10:46 PM Tom_L: you could even use steel tube
10:46 PM Tom_L: aka brake line from the auto store
10:46 PM Tom_L: for the electromagnet
10:47 PM rue_mohr: maybe!
10:47 PM Tom_L: it would press into the plastic tube
10:47 PM Tom_L: and stay put
10:48 PM rue_mohr: :)
10:48 PM Tom_L: you can print spools that will press on the outside for the wire
10:48 PM rue_mohr: spools are trickey
10:48 PM rue_mohr: you have to print the ends and assemble them :)
10:48 PM Tom_L: well turn them on the lathe then
10:49 PM rue_mohr: yes
10:49 PM rue_mohr: I keep wondering if I should do a cnc lathe
10:49 PM rue_mohr: my answer is always that, without a material feeding chuck, there is no point
10:50 PM Tom_L: you saw how i did that
10:50 PM Tom_L: https://www.youtube.com/watch?v=pvDBfJQT2Ec
10:50 PM Tom_L: dowel stop, manual material feed
10:50 PM rue_mohr: feeding chuck?
10:51 PM rue_mohr: oh, yea
10:51 PM Tom_L: move the cutter over to make a 'spool' slot
10:51 PM Tom_L: move it some more to cut the material off
10:51 PM rue_mohr: hah, you dont want to do 200 spools ....
10:51 PM Tom_L: wahlah... spools
10:52 PM Tom_L: nope
10:52 PM rue_mohr: I'd think 200 is a job for a forming cutter
10:52 PM Tom_L: that would waste more material than you would keep anyway
10:52 PM rue_mohr: oh yea
10:52 PM rue_mohr: ok, good point
10:52 PM rue_mohr: printer -> 400 end caps
10:52 PM rue_mohr: ;)
10:53 PM rue_mohr: actually, I can put a tube on one end cap
10:53 PM Tom_L: one flat and one with the T
10:53 PM Tom_L: glue the flat of the T to the 'washer'
10:53 PM rue_mohr: yep
10:53 PM Tom_L: 2 different parts
10:53 PM rue_mohr: I did all those position sensor things
10:53 PM rue_mohr: they had intermediate ends
10:53 PM Tom_L: print 20 at a time
10:53 PM rue_mohr: 3 spools on a pipe
10:54 PM rue_mohr: yea, on 4 printers ;)
10:54 PM Tom_L: better test one first
10:54 PM rue_mohr: yea
10:54 PM rue_mohr: I'v learned, even after a good proof, dont do the whole run
10:55 PM Tom_L: so after you figure out what the tube OD is after inserting the brake tube you can design them
10:55 PM Tom_L: better make a press tool for it too
10:55 PM Tom_L: so they're all the same
10:55 PM rue_mohr: I'm thinking the tube might be better off as something mroe ridgid
10:56 PM rue_mohr: I can play
10:56 PM Tom_L: it will be rigid after you put the brake tube in it
10:56 PM rue_mohr: I wanted to use something clear so I could see it
10:56 PM rue_mohr: yea
10:57 PM Tom_L: gnite
10:58 PM rue_mohr: gnight